Drywall Manual

CI/SfB | | Rf7 | |

August 2005

TH

ED

RYW

ALL

MA

NU

AL

’05

Rf7

THE

DRYWALLMANUAL

www.lafargeplasterboard.co.uk

The Backing of a World LeaderLafarge is the world’s largest producer of construction materials including gypsumproducts, aggregates, roofing and cement. The preservation of natural resources and respect for the needs of people and the environment are fundamental to theorganisation’s business approach and philosophy

Sales OfficesFor placing of orders and delivery enquiries and general information relating to availability of products, stockists etc.

UK Orderline: 0800 373636Ireland Orderline: +353 (0)1 6203114

T. +44 (0) 1275 377777 F. +44 (0) 1275 377700E. [email protected]

LiteraturelineFor next day delivery of Lafarge literature please call before 3pm.


England, Wales and ScotlandLafarge Plasterboard Limited, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF

T. +44 (0) 1275 377773F. +44 (0) 1275 377737

IrelandLafarge Plasterboard (Ireland) Limited, Unit 38, Fonthill Industrial Park, Clondalkin, Dublin 22

T. +353 (0)1 6261603F. +353 (0)1 6261679

The Drywall Training CentreFor all drywall training needs from basic introduction to advanced skills and development.

The Drywall Training Centre, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF

T. +44 (0) 1275 377581F. +44 (0) 1275 377550E. [email protected]

Technical EnquirylineTechnical Advisory Service, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF


WastelinePlease contact with your gypsum waste management enquiries.


For further information and contact numbers for our other business units please go to www.lafarge.co.uk

Certificate No. FM 13594 Certificate No. EMS 75024

Plasterboard, jointing and associated products made in the United Kingdom by Lafarge Plasterboard are manufactured in accordance with management systems certified to BS EN ISO 9001: 2000 (quality) and BS EN ISO 14001: 2004 (environment)

V2

Other Business Units in the LafargeGroup:

Lafarge Cement

Manor House Chilton Oxfordshire OX11 0RN

t +44 (0) 1235 448400 f +44 (0) 1235 448600 www.lafargecement.co.uk

Lafarge Aggregates

Bradgate House Groby Leicestershire LE6 0FA

t +44 (0) 1530 242151 f +44 (0) 1530 243513 www.lafarge-aggregates.co.uk

Lafarge Roofing

Regent House Station Approach Dorking Surrey RH4 1TG

t +44 (0) 1306 872000 f +44 (0) 1306 872111 www.lafarge-roofing.co.uk

Lafarge Gyvlon Ltd

221 Europa BoulevardWestbrookWarringtonCheshireWA5 7TN

t +44 (0) 1925428780f +44 (0) 1925428788www.gyvlon-floors.co.uk

UK Sales Offices

For placing of orders and deliveryenquiries and general informationrelating to availability of products,stockists etc.

Orders can be placed free of chargeby ringing Orderline on: 0800 373636.

Literatureline

For next day delivery of Lafargeliterature, please call before 3pm.

t +44 (0) 1275 377582 f +44 (0) 1275 377402email [email protected]

England, Wales and Scotland

Lafarge Plasterboard LimitedMarsh Lane, Easton-in-Gordano,Bristol BS20 0NF

t +44 (0) 1275 377773f +44 (0) 1275 377737

Ireland

Lafarge Plasterboard (Ireland)Limited, Unit 38, Fonthill IndustrialPark, Clondalkin, Dublin 22

t +353 (0)1 6261603f +353 (0)1 6261679

The Drywall Training Centre

For all drywall training needs frombasic introduction to advanced skillsand development.

The Drywall Training CentreMarsh Lane, Easton-in-GordanoBristol BS20 0NF

t +44 (0) 1275 377581f +44 (0) 1275 377550email [email protected]

Technical Enquiryline

For information and advice on alltechnical aspects of drywall.

Technical Advisory ServiceMarsh Lane, Easton-in-GordanoBristol BS20 0NF


Lafarge Plasterboard online

For information and advice on alltechnical aspects of drywall,including the SELECT 2 dynamicspecification generator, visit:


Trade Associations

Lafarge Plasterboard Limited is amember or an associate member ofthe following organisations:

Association of Building ComponentManufacturers (ABCM)

British Standards Institute (BSI)

Builders Merchants Federation (BMF)

Construction Industry Training Board(CITB)

Construction Products Association(CPA)

Federation of Plastering and DrywallContractors (FPDC)

Gypsum Products DevelopmentAssociation (GPDA)

New Homes Marketing Board(NHMB)

Association of Interior Specialists(AIS)

Association for Specialist FireProtection (ASFP)

Institute of Acoustics (IOA)

Other useful contacts

BSI British Standards HQ389 Chiswick High RoadLondonW4 4AL

t +44 (0)20 8996 9000 f +44 (0)20 8996 4001 www.bsi-global.com

HSE Health and Safety ExecutiveMagdalen HouseTrinity RoadBootleMerseysideL20 3QZ

HSE Infoline 0845 345 0055www.hse.co.uk

Office of the Deputy Prime MinisterEland HouseBressenden PlaceLondonSW1E 5DU

t +44 (0)20 7944 4400f +44 (0)20 7944 5719 www.odpm.gov.uk

Robust Details LtdPO Box 7289Milton KeynesMK14 6ZQ

t 0870 240 8210 f 0870 240 8203 www.robustdetails.com

R E F E R E N C E SCONTACTS AND TRADE ASSOCIATIONS

Contacts

TECHNICAL ENQUIRYLINE t 01275 377789 f 01275 377456 www.lafargeplasterboard.co.uk 377

Designed and produced for Lafarge Plasterboard by NBA Tectonics

The Lafarge Drywall Manual, August 2005supersedes The Drywall Manual, July 2003, January 2001, June 1999 and March 1998

Published by Lafarge Plasterboard Limited

Lafarge Plasterboard reserve the right to reviseproduct specifications without notice. Theinformation given in this publication is correct to the best of the publisher’s knowledge, but users must satisfy themselves as to the suitabilityof any particular product or detail for a specific application.

© 2005 Lafarge Plasterboard Limited

ISBN 0-9545693-2-6

10

TECHNICAL ENQUIRYLINE t 01275 377789 f 01275 377456 www.lafargeplasterboard.co.uk

I N T R O D U C T I O NCONTENTS

1

1

4

5

6

7

8

10

3

2

I N T R O D U C T I O N

L I N I N G S

P A R T I T I O N S

F L O O R S A N D C E I L I N G S

F I R E P R O T E C T I O N

C R E A T I V E D R Y W A L L

S O L U T I O N S

F I N I S H I N G

R E F E R E N C E

P R O D U C TS P E C I F I C A T I O N

Contents ............................................................ 1The Company .................................................... 4The Drywall Advantage ................................... 5Product Range .................................................. 6Customer Services ............................................ 9Products and Systems .................................... 10Theory – Fire ................................................... 11Theory – Structural Strength ......................... 12Theory – Acoustics .......................................... 14Theory – Thermal ............................................ 19

Performance Tables ......................................... 23Direct Bond ..................................................... 29Cormet Dryliner .............................................. 41Cormet Independent Lining ......................... 47Timber Frame .................................................. 55Structural Steel Frame .................................... 59Contour Linings ............................................... 63

Performance Tables ........................................ 71Cormet Twin Frame Systems .......................... 99Cormet Resilient Bar Systems ..................... 107Cormet Acoustic Stud Systems .................... 113Cormet C Stud Systems ................................ 123Timber Stud Systems .................................... 133Masonry Systems .......................................... 139Specialist Junctions and Installations ........ 141

Performance Tables ....................................... 163Direct to Timber ............................................ 179Cormet Dryliner Ceilings .............................. 187Cormet Dryliner to Concrete Floors ........... 193Cormet Suspended Metal Furring Ceilings 197Cormet Acoustic Floor ................................. 207Robust Details ............................................... 215

Performance Tables ...................................... 219Cormet Shaftwall ......................................... 227Cormet Column and Beam Clip System ..... 237

Performance Tables ...................................... 249Fresco ............................................................. 251Cove ............................................................... 261Profiles ........................................................... 267Contour Walls ............................................... 281

The Deco System .......................................... 287Taping and Jointing ..................................... 291Skim Plastering ............................................. 301Texture ........................................................... 305Ready Reckoner ............................................ 308

Lafarge Wallboards ...................................... 312Lafarge Compounds ..................................... 324Lafarge Screws .............................................. 327Cormet Metal Components ......................... 329Cormet Accessories ....................................... 335Lafarge Cove ................................................. 337Lafarge Profiles ............................................ 338

Bibliography .................................................. 372Glossary .......................................................... 373Index .............................................................. 374Contacts and Trade Associations ................ 377

9H E A L T H &

S A F E T YHealth & Safety Datasheets ........................ 344Specification Clauses .................................... 368Environmental Policy .................................... 369Sustainability.................................................. 370

2





3

1

The Drywall ManualThis manual introduces LafargePlasterboard, explains the way wesupport sustainable construction andprovides a comprehensive guide tothe company’s products and services.It incorporates the detailed technicalinformation required to assist theuser in selecting and specifying thecorrect drywall systems forapplications ranging from thedomestic environment to the mostdemanding of commercial andindustrial installations.

It has been designed in tandem withour on line information systems andall of the data incorporated is alsoavailable by logging on towww.lafargeplasterboard.co.uk.

The introduction to themanual offers a broadoverview of the productsand systems available. Theseare then covered in detail inindividual sections including:drawings, performancedata, sitework details andall the information neededto prepare full specificationswhich meet a broad rangeof practical and designchallenges and ensureeffective installation.

If you cannot find astandard system to matchyour concept, contact ourtechnical advice service,Technical Enquiryline, whichwill work with you todevelop a bespoke solution.

Tel: 01275 377789.

Fax: 01275 377456.

Email: [email protected].

Above: The LafargePlasterboard zoned homeweb page Top right: Lafarge CustomerServices departmentBelow: The Lafarge Cormetmetal framing systems can beused to create whatevershape the designer requires –and conceal the servicesBelow right: Dramatic curvedsurfaces can be achievedusing Lafarge Contourwallboard

4

I N T R O D U C T I O NTHE COMPANY


Lafarge – a world leaderLafarge is a world leader in themanufacture and supply ofconstruction materials. It holds top-ranking positions in each of its fourdivisions: gypsum, cement, concreteand aggregates, and roofing. It isactive in 75 countries and employssome 77,000 people.

The Group’s global strength hasbeen built on over 160 years ofexperience and innovation inmanufacture, materials, design andmethodology.

Business objectives go hand in handwith a commitment to respectingthe communities within which wework and minimising theenvironmental impact of ouroperations. Lafarge’s comprehensiveenvironmental policy covers allaspects from the extraction of rawmaterials to recycling and the lifecycle impacts of individual products.It includes the way we work withsuppliers and the protection ofwildlife habitats.

Lafarge Plasterboard is a member ofthe Group’s gypsum division. It wasestablished in the UK in 1987 andhas its principal manufacturingfacility on the outskirts of Bristol.This plant is among the mosttechnically advanced drywallproduction units in the world. It hasthe capacity to supply in excess of 50million square metres ofplasterboard a year.

Lafarge have a number ofdistribution centres which enablefast and effective nationaldistribution of all their products.

The company’s development teamcombines in-depth knowledge of UKmarket requirements with themassive research and testingresources of the Lafarge Group tolead the way in system innovation,providing exciting new solutions totoday’s ever more demandingconstruction challenges.

Top: Lafarge Gypsum’s Technical Development Centre Above: Building Research Centres Fire Testing Laboratory Below: Aerial view of the Bristol manufacturing site


I N T R O D U C T I O NTHE DRYWALL ADVANTAGE

5

1

The Drywall AdvantageDrywall systems provide aneconomic, high performance optionto meet a broad range ofconstruction requirements. They areideally suited to today’s fast-trackconstruction schedules which mustcontrol costs whilst maintaining thehighest quality standards.

Use of these products removes thedrying time associated with wettrades and so aids co-ordinationbetween contractors, whilst at thesame time contributing to overallbuild programme speed.

The metal systems increasingly usedin conjunction with wallboardsintroduce an added element of‘factory control’ on-site, readilyaccommodate building services andavoid the problems sometimesassociated with traditional timberstuds drying out over time.

In refurbishment work, LafargeCormet metal systems provide aconvenient means of creating trueand flat surfaces over the mustuneven of substrates.

Top: Lafarge Drywall systemsproviding a fast tracksolution in AndoverTop right: Live in Quarters,London: POD manufactureAbove: A cinema in Yeovilexploiting the drywalladvantageLeft: The Lafarge Drylinersystem is ideal for solid walls– no wet trades andeliminates the risk ofmoisture penetrationdamaging decorations

6

I N T R O D U C T I O NPRODUCT RANGE


Product RangeLafarge offers a comprehensiverange of drywall systems to meetthe practical and performance needsof both new build andrefurbishment projects in thedomestic, commercial, industrial,leisure and public sectors. The rangeis complemented by designorientated systems that offer thearchitect and specifier huge scope intranslating exciting visual conceptsinto reality on-site.

Today, there is a cost-effectivedrywall solution to virtually everywall lining, partition, ceiling andflooring challenge whether therequirement is for flat and truedurable surfaces, eye-catching curvesor stunning creative detailing asoffered by Lafarge profiles.

The range is constantly reviewed toensure products meet changingconstruction needs and reflectmodifications in Building Regulations.The focus is on the provision ofsystems that combine ease ofinstallation with the highestperformance standards.

Plasterboard, jointing and associatedproducts made in the UnitedKingdom by Lafarge Plasterboardare manufactured in accordancewith management systems certifiedto BS EN ISO 9001: 2000 (quality)and BS EN ISO 14001:2004(environment) and verifies theirconformance with appropriateBritish and International Standards.

Boards

Construction practice and BuildingRegulations call for a family ofboards to match specific installationneeds.

Lafarge wallboards arecomplemented by high performanceproducts specifically designed forthermal and acoustic applications,and to provide impact, moisture,vapour and fire resistance.

Top: An exciting use of Lafargesystems at Century Cinema CardiffRight: Part of the range of LafargewallboardsBottom left: Lafarge wallboard andcoving create a comfortable home



7

1

Design-orientated Products

Coving and decorative Fresco panels,that re-create the traditionalappearance of panelled walls andceilings, make light work of addingluxury to interior design.

The ‘Profiles’ range of aluminiumextrusions enables features such asbullnose corners, uplighters andreveals, recesses, accent lines,shadowgap grooves, curved andrebated corners, stepped cornices,architraves, skirtings and mouldingsto be incorporated with ease.

Metal Systems

Lafarge has developed a completerange of metal systems for use incombination with its boards. Fromnon-load bearing metal studs topurpose-designed partitions andfrom traditional metal furringceilings to intricate curves. There’s adrywall solution to meet the needsof all the design professionalrequirements.

To complement its range forstandard drylining, partitions andceilings, Lafarge offers specialistsystems such as Shaftwall for liftshafts. It is important that systemspecifications are not compromisedby mixing metals and boards fromdifferent manufacturers. To providetotal peace of mind, LafargePlasterboard has introduced the“Cormet” brand covering all thecompany’s metal systems for lining,partition and ceiling applications.Cormet brings together the higheststandards of design, innovation,manufacture, quality control andtechnical support to providecomplete, fully warranted drywallsolutions.

Top right: Lafarge Fresco addsdistinctionAbove left: Lafarge aluminiumprofiles Above right: Specialist Lafargesystems were used extensivelyat the Open UniversitybuildingRight: Jointing a tapered edgewallboardLeft: The components used inthe Lafarge Encasement system

Finishes

A number of finishing options areavailable offering a choice betweentaping and jointing, skim plasteringand decorative textured coatings.

The latest Taping and Jointingsystems make use of two-coatcompounds for bedding, joint fillingand finishing. This reduces the timeneeded to complete the jointingprocess and avoids the additionallabour and drying time associatedwith skim plastering.

Encasements

Drywall provides one of the mostcost-effective means of providingfire protection to steel columns andbeams. Lafarge systems combinesimple installation with long termperformance and the capability toachieve up to 180 minutes fireprotection.

8



The Deco Range

The Deco range of colour matchedboard systems is designed to providea consistent white finish. The paperface of the wallboard is factorysealed and combined within thesystem are a range of Deco JointCements that have been speciallyformulated to both colour matchand offer the same paint absorptioncharacteristics as the wallboard.

Megadeco

A versatile and high performancewallboard, which combines thecharacteristics of Firecheck (fireresistance), dBcheck (acoustic) andToughcheck (high impact resistance)with the additional benefit of theDeco pre-sealed finish applied to theface of the paper.

Thicknesses available: 12.5, 15mm

Hydrodeco

Designed for applications whereMoisturecheck (moisture resistance)is required, with the Deco pre-sealedfinish applied to the face of the paper.

Thicknesses available: 12.5mm

Predeco

Alternative to Standard wallboardwith the Deco pre-sealed finishapplied to the face of the paper.

Thicknesses available: 9.5, 12.5, 15mm

Predeco Joint Filler*

Setting compound used for bedding,filling and for external corners withinthe taping and jointing process.

Deco Joint Cement*

Air drying lightweight ready mixedcompound which can be used forbedding, filling and finishing withinthe taping and jointing process.

Deco Machine Joint Cement*

Air drying lightweight ready mixedcompound specially formulated foreasy application when used inconjunction with Premier range of Automatic Taping Machines.

Suitable for bedding, filling andfinishing within the taping andjointing process.

Note:

* Deco joint compounds, definedabove, are the only jointingcompounds that should be usedwithin the Deco system.

Decoration

Lafarge Plasterboard does notrecommend the use of gloss, eggshell,silk or sheen paints in line with thecode of practices of BS 6150: 1991Painting of buildings and BS 8212:1995 Dry lining and partitioningusing gypsum plasterboard.

However, should you choose to usesuch finishes, Lafarge Plasterboardrecommend the use of an additionalcoat of Lafarge Universal Sealer whenusing the Deco system. The Decosystem is not suitable for plastering.

Fire, Acoustic & ThermalSolutions

Fire Protection

All Lafarge Plasterboards are Class 0.The gypsum cores are classified asnon-combustible. The range includesboards that allow fire resistancefrom 30 to 180 minutes to beachieved with ease.

Sound Insulation

Drywall products offer a lightweightconstruction technique capable ofoffering excellent insulation againstthe transmission of airborne andimpact sound in applications rangingfrom domestic properties to hospitalsand digital multiplex cinemas.

Thermal Performance

Lafarge products and systems areavailable with a range ofpolystyrene and phenolic foamlaminates and can also be used inconjunction with mineral woolinsulation to achieve the higheststandards of thermal resistance.

Above: Great WesternHospital, Swindon Below: A fire test at BREBottom: Lafarge Thermalcheckbeing installed


I N T R O D U C T I O NCUSTOMER SERVICES

9

1

Customer ServicesThe Lafarge customer servicecommitment combines constantmonitoring of performance throughthe On Time In Full (OTIF)programme with a number ofdedicated support departments.

The Customer Service and SalesOffice teams process ordersnationwide and providecomprehensive data on productavailability, stockists and deliveryschedules. See back page for contactinformation.

The Drywall Training Centreoffers a range of courses to enablespecifiers, merchants, contractorsand supervisory staff to keepabreast of the latest drywalldevelopments and installationtechniques. It also develops bespoketraining for individual customerneeds. All courses are CITB approvedand training can be integrated withNational Vocational Qualificationprogrammes. See back page forcontact information.

The Technical Enquiryline providesexpert advice on technical issuesrelated to specification andinstallation. See back page for contactinformation.

Lafarge Literatureline provides aquick and efficient service in thesupply of literature on companyproducts. Next day delivery isguaranteed for all orders receivedbefore 3pm. See back page forcontact information.

www.lafargeplasterboard.co.ukprovides on line access to all ofthe information within theDrywall Manual. The web siteadditionally includes the latestnews from Lafarge Plasterboard,and email links to key contactswithin the company.

Further installation detailsincluding photographicreferences and coverage ratesare provided in the LafargePlasterboard Installation Guide.

left: Customer Service teammemberabove: Lafarge Plasterboardhome pagebelow: Advice being given atthe Lafarge Training Centre

10

I N T R O D U C T I O NPRODUCTS AND SYSTEMS


Product/System Application Section

Boards Megadeco White board, colour matched to joint cements – an alternative to 8Firecheck, dBcheck or Toughcheck, ideally suited for hospitals, schools and high traffic areas

Hydrodeco White board, colour matched to joint cements – an alternative 8to Moisturecheck

Predeco White board, colour matched to joint cements – an alternative 8to standard wallboards

Toughcheck For locations requiring additional impact resistance 8

dBcheck Where higher levels of sound insulation are needed 8

Firecheck For locations requiring improved fire resistance 8

Echeck Meets the performance standards for plasterboard in Approved Document E 8

Acoustic Homespan Achieves at least 40 dB sound resistance when used as part of the Acoustic Homespan Partition system 8

Moisturecheck Wherever protection from moisture ingress is required 8eg kitchens and bathrooms

Vapourcheck Wherever protection from moisture vapour is required 8eg kitchens and bathrooms

Standard wallboard General purpose board 8

Wall linings Direct bond Where boards are to be fixed directly to sound substrates 2

Dryliner Where it is advantageous to create a cavity up to 150mm 2between the lining and the substrate. Tackling the problems posed by very uneven substrates

Timber frame Fixing drywall products to traditional timber studs 2

Independent Wherever there is a requirement to construct a lining without 2any direct connection to the substrate

Partitions Acoustic Homespan Domestic partitions requiring higher levels of sound insulation 3

Metal stud All forms of partitions in domestic, commercial and industrial buildings 3

High performance Partitions in applications demanding exceptional performance, 3such as multiplex cinemas, auditoria, and very high partitions inindustrial environments

Ceilings Timber Fixing drywall products direct to timber joists and trusses 4

Dryliner Where creating a true flat surface may otherwise be difficult 4

Horizontal Shaftwall Where exceptional levels of fire resistance are required 4

Metal Furring Wherever it is appropriate to create a ceiling void to 4accommodate services

Acoustic Floor Acoustic Floor Provides high levels of acoustic separation between storeys 4or dwellings in renovation projects

Fire Protection Shaftwall A speedy, reliable and effective system that is cost effective and 5Column and Beam practical to install

Finishing Deco System Colour matched, pre-sealed boards and joint cements for domestic, 7commercial and industrial locations

Taping & Jointing The quickest and most cost-effective way to joint drywall systems 7and achieve a flat surface ready for direct decoration

Skim plastering Where specifier preference is for a plastered finish 7

Texture Wherever a crack-resistant decorative texture surface is required 7

Lafarge Systems at a glanceThe table below is designed as aquick reference to the principalLafarge drywall products andsystems and is coded to show thedetail sections of the manualrelating to them.


I N T R O D U C T I O NTHEORY

11

1

Fire

HistoryGypsum-based products have longbeen used to protect against fire.The molecular structure of gypsumcontains combined water molecules.The evaporation of this combinedwater absorbs a large amount ofenergy from the fire before theactual gypsum material is degradedand fire spread is therefore delayed.

Changing legislationHistorically, under ApprovedDocument B of the current BuildingRegulations for England and Wales,all materials to be used in buildingconstruction are required to satisfyvarious levels of performance, undertwo main fields, Reaction to Fire andFire Resistance.

Reaction to Fire

Reaction to fire regulations areconcerned with the contribution toany fire that a material is likely tomake. This potential contributionhas been evaluated by testing inaccordance with British Standard476: Parts 4 (Non-Combustibility),Part 5 (Ignitability), Part 6 (FirePropagation) and Part 7 (SurfaceSpread of Flame). The well-knownClass O classification is acombination of results from testingto Parts 6 and 7.

These tests are carried out on thebasic materials themselves.

Under the above tests, most LafargePlasterboard products achievedresults which enabled them to beclassified as Materials of LimitedCombustibility and to achieve theClass O classification.

In addition, there is the CoreCohesion test in British Standard1230, which determines if awallboard can be classed as a Type 5(Fire Resisting) wallboard. BS 1230 isto be superseded by BS EN 520.

Fire Resistance

The fire resistance regulations areconcerned with the length of time aconstruction can delay any fire fromspreading from the compartmentalready involved in the fire into anyadjoining compartment or property,or the length of time theconstruction can delay collapse ofany building involved in the fire.

The delay in fire spread or buildingcollapse provided by theconstruction is vital to allowevacuation or fire fighting to takeplace as well as limiting the extentof damage caused by a fire.

The contribution made by aconstruction has been determinedby testing or assessment inaccordance with British Standard476: Parts 20, 21, 22, 23 & 24, and ismeasured in minutes, according tohow long the construction satisfiedthe requirements of the appropriatestandard.

Only a complete construction, asopposed to a material, can beevaluated for fire resistance.

New LegislationThe following is a statement fromthe Gypsum PlasterboardDevelopment Association (GPDA)from 16th September 2004, Fire tests– The European Standard

“As a result of efforts to harmonisefire test standards throughout theEuropean Union, British Standardfire resistance and reaction to firetests will gradually be replaced byharmonised European Standards.

It is anticipated that the existingBritish Standard BS 476 will continueto be used for the time being, asthere is currently no target forlegislation to require the testing of products to the BS EN standard,BS EN 1363 and plasterboardmanufacturers will continue toquote the BS in their technicalliterature. Gradually, however,specifiers will become familiar withthe EN standard and the BS willbecome less used, and willeventually become obsolete.

It is anticipated that the gypsumwallboard manufacturers in GreatBritain and Ireland will quote onlyEN fire test data in their literaturefrom 1st January 2007.”

It is to this end that LafargePlasterboard has taken thisopportunity to start the process ofinforming our industry of thediffering effect that the EN standardwill have with regard to overallsystem performance.

We have in this issue published boththe BS 476 and EN 1363 resultsalongside one another with theview of only publishing the ENstandard performance from 1stJanuary 2007.

BS EN Reaction-to-Fire testsUnder the old UK system forclassifying the reaction to fireperformance of building productsplasterboard falls into the BuildingRegulations defined category of

'Material of Limited Combustibility'.Under the new Euro classificationsystem gypsum wallboards areclassified after testing as EuroclassA2, the second highest performancelevel. In the consultation packagepublished by DTRL (now ODPM) amaterial of limited combustibility isequated to Euroclass A2 andtherefore is no change in thepotential usage of wallboard onreaction to fire applications.

BS EN Fire Resistance Testing

Severity

The eventual introduction of thenew European tests for fireresistance (The BS EN 1363 series)will have the effect of increasing theseverity of fire resistance testing inthe UK. The principle reason for theincrease in severity of the test is theadoption of the plate thermocouple,the device used by test laboratoriesto measure the temperature insidethe furnace. This new device gives aslower reaction to the actualtemperature rise within the furnaceand therefore requires more heatinput in order to follow what isnominally the same time/temperaturecurve as specified in BS 476.

There are some further, minor,procedural changes that furtherincrease the severity of the test.Back-to-back testing demonstratesthat the increase in severity for testson gypsum-based products willdecrease the fire resistance periodby 10-15%.

12



Structural Strength

Stud Partitions – Non-loadbearingThe strength of a partition is judgedby its ability to resist deflectionunder load, or by the force neededto break through the partition whensubjected to an impact by either ahard or soft body.

The factors which control theseaspects of acceptability are:

• The bending strength of theframe

• The height of the frame

• The thickness of the wallboards

• The number of wallboard layers

• The rigidity of the head fixing

• The spacing of the studs

• The axial load (if any) from above

• The wind load - uniformlydistributed load (UDL) if any

• Any temporary point load (if any)at mid height

• The stiffness of the wallboards

• The hardness of the wallboards

• The bending/breaking strength ofthe wallboards

It is not possible to write amathematical equation which takesinto account all these factors andwhich, when the physical propertiesof the materials are used tocalculate, for example, height limit,gives a satisfactory relationship topractical acceptability.

Instead, over the years, gypsumboard manufacturers have built up adossier of knowledge which relatesthe main parameters to theacceptability of known genericsystems. There is also a nucleus oftesting data, to fall back upon,where this acceptability is in doubt.

Lafarge have carried out a greatmany tests in accordance withmethods described in BS 5234: Part 2:1990. The 5 main tests are:

• Stiffness– 500 N temporary pressure

• Soft body impact– 50 kg swinging bag

• Hard body impact– 5 kg swing hammer

• UDL and crowd pressure– 2.5m beam pressure

• Door slamming– 100 slams, 35 kg door for LDand MD– 100 slams, 60 kg door for HDand SD

From these tests it is possible tojudge whether the partition isgraded as

• Light duty LD

• Medium duty MD

• Heavy duty HD

• Severe duty SD

When testing for axial load, thepartition is loaded from the topusing hydraulic jacks pushing downon a spreader beam. This test is notincluded in BS 5234.

When testing for racking resistance,the partition is loaded both fromabove and from one top corner.This test is mainly applied toexternal wall panels, in steel andtimber framed buildings, where thepanel may also be subjected to windloads, also not part of BS 5234.

The failure criteria for the testsunder BS 5234 are shown in a table7.1 taken from Part 1 of thisdocument.

BS 5234 also covers tests for cupboard,shelf and wash/hand basin loadsand pull-out strength of fixings.

The duty ratings are shown in thetables of performance, in subsequentchapters of the Drywall Manual.

Where duty ratings are not shown,or where a particular combinationof boards and studs has not beentested or expertly assessed, it ispossible to extrapolate the rating bycomparing the nearest equivalent.The most important parametercontrolling height limit is the overallthickness. The relationship betweenheight and thickness is called theslenderness ratio.

Slenderness ratio Sr =

Height in mm hThickness is mm t

As a rough guide, Sr should be lessthan 40, but for design purposestargeted at 30, when there is nosuspended ceiling either side.

Example:RMP 01 = 70mm studs, 1 x 15 Megadeco board each sideMax h = 3800mmt = 100mm,Sr = 38

For Severe Duty, this partitionwould, when tested to BS 5234,achieve:

• Stiffness – < 10mm deflection, 500 N temporary pressure

• Impact, hard body – noperforation 30 Nm hit

• Impact, soft body – < 1mmresidual deflection 120 Nm hit

• Beam or air bag UDL – h/240 <15mm deflection

Domestic partitions would beexpected to be designed and testedto the LD standard.

In practice, LD has been shown to betoo weak. These partitions are too‘flimsy’ and not marketed byLafarge Plasterboard Ltd.

Loadbearing partitions cannot becreated from metal studs less than70mm web depth and 1.2mm steelthickness. Timber studs should be atleast 75mm x 44mm. In both cases,the maximum centre to centrespacing is 600mm. All the load hasto be carried by the frame, typically,> 5 kN per stud. Gypsum wallboardlinings will assist with overallstiffness of the partition, but cannotbe relied upon to give support tocrushing from overloaded frames.When fire testing loadbearingsystems, it would be usual to expectto achieve only half the period offire protection achievable from non-loaded partitions.

Load bearing stud capability isavailable by calculation, or fromtimber frame and steel stud framemanufacturers. Lafarge PlasterboardLtd does not offer this service.

Wall LiningsWall linings are usually fixed to arigid support frame or masonry, viaclips and brackets, or by plasterdabs.

The criteria under BS 5234 apply toboard impact resistance but notdeflection unless the board is veryflexible. Where the lining is createdfrom independent studs, all the sameparameters as with partitions apply.

As a general guideline, wall liningsusing 12.5mm Standard wallboardwill be Medium Duty, 15mm boardHeavy Duty, 15mm Megadeco boardSevere Duty. Any board combinationusing double layers gives SevereDuty. 12.5mm Toughcheck is alsoSevere Duty. 9.5mm wallboard is notrated.



13

1

Structural Strength

BS 5234 – Performance TablesTable 4. Partition grades: Summary of requirements and principle test performance levelsRequirement & Units Grade (See Table 3) Principal criteriatest method(1) LD MD HD SD

Stiffness (A) mm 25 20 15 10 Maximum deflection

mm 5 3 2 1 Maximum residual deformation

Small hard body impact:

Surface damage (B) N.m 3 3 6 10 Judgement of indent

Perforation (D) N.m (2) 5 15 30 No perforation of facing

Large soft body impact:

Damage (C) N.m 20 20 40 100 2mm maximum deformation

Structural Damage N.m 60 60 120 120 No collapse or dislocation

Door slam (F) No. 20 20 100 100 No damage and 1mm maximum

displacement

(1) Test methods are shown by letters in brackets which relate to annexes in BS 5234: Part 2: 1992(2) No requirements for this grade

Ceilings & FloorsThe spanning capability of floorjoists whether steel or timber is wellestablished from performancetables. Likewise concrete beams andin-situ reinforced concrete. Thisinformation is not available viaLafarge Plasterboard Ltd.

Under a structural floor theplasterboard lining is used to providea cosmetic finish and to give addedacoustic insulation and fire protection.

The ceiling systems within thismanual will not support foot traffic.It is important that the statedloading in this manual is notexceeded, if in doubt please contactTechnical Enquiryline.

When plasterboard is used as asuspended ceiling, with the CormetSuspended Metal Frame system, itmay also be required to supportlight fittings, lightweight servicesand insulation.

All of the ceiling systems in theDrywall Manual have been designedand tested so as to be capable ofsupporting a load, where the pulldown safety factor is at least x 3, i.e.3 times the weight of the ceiling,inclusive of the board weight.

There are cases where thesuspension hangers are further apartthan 1200mm for example, whereroof purlins are at 1500mm. In thiscase, special details and a strongerprimary channel are needed. Forthis, please consult our TechnicalEnquiryline.

Lafarge do not accept responsibilityfor fixings into concrete, hot rolledstructural steel beams and steeldecking.

Above: BS 5234 Impact test beingcarried out at BRE Testing Centre

14



Principles of SoundAcoustics is a subject that describesall aspects of sound and falls intothe fields of both science and art.

The science of sound envelops thetechnicalities of its generation,propagation and reception as wellas objectively describing its qualities.In the artistic world, sound plays alarge part in terms of the spokenword, music and other auditoryexperiences that give us pleasure. Awell used acoustical term is noise,often described as unwanted sound.The sound that is generated by oneparty is noise to another party ifthey have no interest in it or aredisturbed by it. For instance, thesound of classical music played byyour neighbour is noise to you ifeither you hate that particular pieceor it is so loud that you cannotconcentrate on the calculation youare attempting to solve.

Airborne sound as its namesuggests, is generated in the air by avibrating object. Examples ofairborne sound sources are:

• the human voice

• Hi-Fi playing through a loudspeaker

• musical instruments such as aviolin (vibrating string) or atrumpet (vibrating air column)

The decibel

Sound travels away from its sourcethrough the air as a pressure wavefluctuating about the almostconstant atmospheric pressure. Thepressure fluctuations are very smallcompared with atmospheric pressurebut the difference in pressure of asound that can be just heard(threshold of hearing) and one thatis excessive is more than a milliontimes greater.

For this reason, sound is notmeasured in terms of its pressure.

The method used is to compare thepressure of a particular sound withthe nominal threshold of hearingpressure and then use a logarithmicscale to compress the range.

This is called the decibel (dB) scaleand allows the useful range ofsounds to begin at 0 dB (thresholdof hearing) and effectively end at140 dB where hearing is likely to beirreparably damaged by a singleshort noise event.

Sound pressure level is the termused to denote the amount ofsound present in decibels (dB).

Acoustics

The ear is the most common sounddetector. In the absence of sound,the ear drum remains stationaryheld steady by atmospheric pressureof the air which reaches it on oneside from the ear canal and on theother from the mouth. When asound wave travels along the earcanal, the pressure fluctuationcauses the ear drum to vibrate and asignal is sent to the brain. The levelof sound heard by the ear can beevaluated subjectively and very smallchanges can be detected. A 5 dBchange in sound pressure level isgenerally considered to besignificant. For many reasons,everyone’s hearing is not identicalbut for simplicity, we define 0 dB asthe point where we begin to hearsound or the threshold of hearing.

Measuring sound

In order to obtain an absoluteevaluation of sound pressure level, asound level meter is used. Thiscomprises a microphone with adiaphragm that vibrates on detectionof the sound wave and a means ofconverting the vibration into anelectrical signal that is processed togive a display in decibels.

Background noise can affect theassessment of a sources sound level.For instance, road traffic in thedaytime may cause us to increasethe radio’s volume to a level whichseems excessive during a quieterevening period. It can be difficult tomeasure the sound pressure level ofa source if the background noise isless than 10 dB below the soundpressure level of the source itself.

Sound frequency

In addition to its variation in levelsound has another importantproperty called frequency or pitch.Sources vibrate at different ratesgiving the sound produced a qualitythat has a uniquely identifiedcharacter. The rate of vibration ismeasured in cycles per second andits unit is named the hertz (Hz).Sound that can be heard by thehuman ear ranges from around 20 Hz to 20,000 Hz. The human earhas varying sensitivity to differentfrequencies being less sensitive atlow frequencies and very highfrequencies. A curve can be drawnwhich shows the variation ofsensitivity with frequency rise to itsoptimum in the range 1000 Hz to4000 Hz then falling away withincreasing values. This is known asthe “A” weighting curve.

Most sources produce sound whichcontains many different frequencies.

To obtain a more detailed objectiveanalysis of a sound source, we canuse a more sophisticated sound levelmeter that has the capability toevaluate frequency as well as soundpressure level.

Building AcousticsNoise control as the name suggests,envelops the techniques used tominimise the effects of unwantedsound and thus optimiseenvironmental conditions. In theconstruction industry, BuildingAcoustics is the term which coversthis aspect of sound. BuildingAcoustics involves both the controlof noise within an enclosed spaceand the reduction of noise betweenrooms or from either outside orinside a building.

Sound AbsorptionNoise is generally controlled withina space using sound absorbingmaterials. Sound absorption relatesto the percentage that effectivelydisappears when the sound wavehits a body or surface. Soundabsorption is evaluated bymeasuring the reverberation time ofa room. The reverberation time isdefined as the time taken for thenoise (sound pressure level) to fall to60dB below its original level when asound source ceases to operate. Ifthe reverberation time is long thenthe room will be live and theconditions will be acousticallyuncomfortable for most activities. Ifthe reverberation time is too shortthen sounds such as music mayappear flat and lack character.

Therefore where possible, we designa space to have an optimumreverberation time for its use.

The sound absorption properties ofa specific material or system can beevaluated in a purpose builtlaboratory called a reverberationroom. This comprises a large space(approximately 200m3) that has hardreflective surfaces usually plasteredmasonry. The empty room has longreverberation times which aremeasured prior to installing about10m2 of the material under test.Measurements are made in thirdoctave frequency bands from 100 Hzto 5000 Hz. Assuming that thematerial has greater soundabsorption than the room surfaceon which it is installed, thereverberation times which are again



15

1

Acoustics

measured will now be shorter thanin the empty condition. Thereverberation times in eachcondition can be used to calculatethe sound absorption of the roomand the difference between the twovalues gives the sound absorption ofthe installed sample. If we thendivide the sound absorption of thesample by its area, the absorption/m2

is obtained. In practice, this is avalue between 0 and 1 and is calledthe absorption coefficient. A hardconcrete surface has a very lowsound absorption coefficient (lessthan 0.05 at most frequencies),whereas a thick carpet and underlaycan approach 1.

Acoustic consultants use theabsorption coefficients of materialsto estimate the reverberation timesof specific buildings. However, inmany rooms for example smalloffices, it is sufficient to specifytotally covering one or two surfaceswith a good sound absorbingproduct such as carpet or a mineralfibre tile ceiling.

Sound InsulationThe reduction of noise throughstructures is called sound insulation.

Airborne sound insulation is theability of a construction separatingtwo rooms to resist the passage ofairborne sound.

Sound passes from one room toanother by travelling either throughthe dividing element or thesurrounding structure (flankingtransmission).

The evaluation of the soundinsulation of a single buildingelement, such as a partition, takesplace in purpose built laboratoriescomprising a pair of rooms with anaperture into which the teststructure is erected. In such alaboratory, flanking transmission isnegligible and so the optimumsound insulation of the element isobtained. The sound insulation of abuilding element is related to thesound power reduction through theelement and is termed the soundreduction index (R).

Site testing takes place between apair of rooms in a building and thesound insulation of the integratedconstructions (including flankingtransmission) is obtained which is afunction of both design andworkmanship. The sound insulationvalue on site relates to the soundpressure level reduction betweenrooms and the reverberation time

of the receiving room and is termedthe Standardised Level Difference(DnT).

The general testing method is asfollows:

• Sound is generated through aloudspeaker in one room (sourceroom) and the sound pressurelevel (L1) is measured using asound level meter.

• The sound pressure level is alsomeasured in the other (receiving)room (L2) so that the reductioncan be calculated. The bigger thereduction is, the better theairborne sound insulation.

• In addition, reverberation timemeasurements (T) are made in thereceiving room in order tonormalise any sound absorptioneffects. The reason for this can beexplained by considering a pair ofempty rooms with a sound sourcesuch as a radio operating in one.The level of radio sound heard inthe other room depends on thesound insulation of the dividingelement and associated structureplus the amount of soundabsorption in the room. If we nowinstall a carpet and otherfurnishings in the receiving room,the sound pressure level willreduce due to the increasedsound absorption thus resulting inapparently better soundinsulation. Therefore in order toobtain the same sound insulationresult in each case, we measure

the reverberation time andcompare this to a standardreverberation time (T0 usually 0.5seconds) in order to obtain acorrection to add to the leveldifference.

The Standardised Level Difference(DnT) is described by the equation:

DnT = L1 – L2 + 10Log10T0.5

For both laboratory and site tests,measurements are carried out in onethird octave bands generally over afrequency range between 100 Hz to5000 Hz. This allows a graph ofsound insulation verses frequency tobe plotted which can be used fordesign purposes.

However, to simplify thepresentation of data, a ratingmethod has been devised whichcalculates a single figure from thesound insulation spectrum. Thesingle figure is obtained byoverlaying the measured soundinsulation graph with a standardcurve shape whose position can beshifted so that certain criteria aremet. The single figure relates to thefinal position of the reference curve.

For laboratory tests, the singlefigure quantity is termed theWeighted Sound Reduction Index(Rw) and for site tests the WeightedStandardised Level Difference (DnT,w).The graph below shows a typicalsound insulation graph and thecurve used to rate it.

100125

160200

250315

400500

630800

10001250

16002000

25003150

40005000

20

30

40

50

60

70

80

90

100

Frequency (Hz)

Sou

nd

Red

uct

ion

Ind

exR

(dB

)

RCP 55 EN ISO 717-1 Curve

Acousticresponse

curve

16



Acoustics

The use of these values should berestricted to ranking constructionsof the same type. The use of singlefigure ratings for design purposes isdifficult because two different typesof construction, for example amasonry wall and a metal studpartitions, may have the same valuebut totally different spectralperformance.

To complicate the issue further,other single figures have beendevised called Spectrum AdaptionTerms. Spectrum Adaption Terms arevalues which are added to the singlefigure rating (eg DnT,w) to takeaccount of a particular activitywhich may be taking place in thesource room.

Ctr, spectrum adaptor term, typicallyrelates to urban road traffic or lowfrequency noise.

In the current Approved Document Ethe method of calculating airbornesound insulation has changed. It isnow necessary to apply a correctionfactor (Ctr to all site test results) andit should be noted that the Ctr

correction factor is always anegative figure.

For a Ctr calculation on any Lafargesystem detailed, please contact ourTechnical Enquiryline, tel 01275 377789.

Impact Sound

Impact sound is generated whenone object collides with anothercausing it to vibrate. Examples ofimpact sounds are footsteps andhammer blows.

Impact sound insulation is specific tofloors and is an evaluation of theability of the floor to attenuate thesound produced when an objectstrikes its walking surface. In animpact sound insulation test, soundis generated by a standard tappingmachine that is placed on thewalking surface. The tappingmachine comprises five hammerheads all of the same dimensionsand weight which are continuouslydropped in turn onto the floor (tenimpacts per second). The impactsound travels through the floorstructure to the room below wherethe sound pressure level (Li) ismeasured. The lower the soundpressure level is, the better theimpact sound insulation.

The evaluation of the impact soundinsulation of a floor element takesplace in a purpose built laboratoryand a value called the Normalised

Impact Sound Pressure Level (Ln) isobtained.

On site, we evaluate the floorelement and its surroundingstructure and the result is called theStandardised Impact Sound PressureLevel (LnT).

As for airborne sound insulation,this is a function of thereverberation time in the receivingroom and is given by the equation:

LnT = L1 - 10Log10T

0.5

The single figure ratings used todescribe impact sound insulation inthe laboratory and on siterespectively are WeightedNormalised Impact Sound PressureLevel (Ln,w) and WeightedStandardised Impact Sound PressureLevel (LnT,w).

The standards used to measuresound insulation are the BS EN ISO140 series whilst single figure ratingsare determined using BS EN ISO 717-1 and 2.

Sound Insulation DesignDesigning for sound insulationpurposes involves the selection of asuitable dividing element and thendetailing the associated structure tobe compatible.

The Dividing Element

The airborne sound insulation of asolid building element is largelygoverned by its surface mass. TheEmpirical Mass Law is a rule devisedby plotting the surface mass against“mean” sound insulation for manysolid structures. It shows that themean sound insulation increases by4 to 5 dB each time the surface massis doubled. Using this principal alonewe see for example that a singlelayer of plasterboard having a soundinsulation of 27 dB can be combinedwith another layer to achieve 32 dBand two further layers to reach 36 –37 dB. However, experience hasshown that using practical buildingmethods such as the Lafarge CormetSystem, two layers of 12.5mmdBcheck wallboard each side of aCS70/R Cormet metal stud and a25mm glass mineral wool have aWeighted Sound Reduction Index of 56 dB (see RSP 11 page 73). This is achieved by a combination ofmass and discontinuity. The thingauge metal stud allows each pairof wallboards to act as semi-independent linings, the resultingsound insulation being much betterthan predicted from the mass alone.

This and other principals to achievehigh levels of sound insulation in apractical and economical way can besimply explained as follows:

• A single light gauge metal studframe lined with one layer ofwallboard gives a soundinsulation of at least 5 dB morethan predicted by the EmpiricalMass Law due to the separationand discontinuity provided by thestud. The main limitation is the airin the cavity which acts as a“spring” connection between theplasterboard leaves.

• A glass or rock mineral wool infillwhich effectively damps the airspring in the cavity, improves thisvalue by at least 5 dB.

• Double layers of wallboard give afurther 8 to 10 dB because theyare now operating as semi-independent linings.

• Fixing resilient bar to one side ofthe metal stud frame createsvirtually independent linings andgives about 6 dB improvement.

• Twin independent frames not onlygive structural discontinuity butallow the wall width to beincreased which optimises the“airspring” discontinuity andresults in good low frequencyimprovements. Acoustic crossbraces are available to optimisethe maximum partition heightsachievable.

The levels of sound insulation thatcan be ultimately achieved, allowmetal stud systems to be usedexclusively in one of the mostonerous situations, that of multi-cinema separation.

These principles can be applied toother forms of construction tooptimise sound insulation.

• The Dryliner system providesvirtually independent wall liningsto improve the performance ofsolid and cavity masonry walls. Aglass or rock mineral wool infilloptimises the levels achieved.

• The M.F. and Dryliner ceilingsystems or resilient bar providediscontinuity in timber, steelframe and concrete floors.

• 15mm dBcheck wallboard overglass or rock mineral woolprovides a floating floor baseonto which a chipboard walkingsurface is laminated in platformtimber and steel joist systems orover concrete bases.



17

1

Acoustics

Sound insulation on-site Having selected a suitable dividingelement, the next step is to considerhow this should be constructed withthe associated building structure inorder to obtain the required soundinsulation on site.

Generally due to flankingtransmission, the sound insulationachieved on site will be less thanthat found in the laboratory.However, the shortfall is by nomeans a constant value.

For instance, if cost and practicalrestraints did not exist and everystep was taken to make flankingtransmission negligible, thelaboratory value could be achieved.However at the other extreme, acontinuous air duct connecting thetwo rooms could result in acatastrophic reduction in soundinsulation.

The following list though notexhaustive, gives pointers towardsgood sound insulation design.

• Perimeter sealing of metalstud partitions/plasterboardlinings

In order to optimise the soundinsulation of metal studpartitions, it is imperative that allperimeters are sealed. It is notuncommon to find that a highperformance wall is apparentlygiving poor sound insulation onsite purely due to the lack of aseal at base level, the loss caneasily be 10 dB worse than thatexpected.

The gap at the bottom of thelining is generally hidden by askirting board but prior to fittingthis, it should be totally filledwith Lafarge Acoustic Sealant.This flexible acrylic mastic willaccommodate movement andcracking so that a satisfactoryacoustic seal can be maintained.

The quality of the sealingtreatment is important and soprior to application, dust shouldbe swept from the floor and themastic should be “gunned” intothe joint resulting in a completefill. This treatment is applicableanywhere where a partitionterminates against masonry andstandard paper tape jointingtreatments are not possible.

• Services in metal studpartitions

Thought must be given to themethod of installation ofelectrical sockets, TV and othersimilar outlets in order tooptimise sound insulation andpreserve fire resistance properties.With correct detailing, it isfeasible to overcome potentialdifficulties.

• Services passing throughpartitions

Services such a ducts, cable traysand pipes which pass throughpartitions can have a detrimentaleffect on sound insulation andfire resistance. For high levels ofsound insulation, it is necessary to“shield” the services by installinga plasterboard ceiling in eachroom.

• Deflection heads in metal studpartitions

When non-loadbearing partitionsare installed beneath floors orroofs, it is often necessary toincorporate a detail toaccommodate deflection. Whilstmethods are available whichreduce the effect of soundleakage, optimum performance isagain achieved by the provisionof a suspended plasterboardceiling in each room of equivalentmass to the partition.

• Metal stud partition junctions

Where a separating wallterminates at an internal partitionor corridor wall, it is imperativethat the bi-passing partitionlinings are broken in order tominimise flanking transmission.With careful detailing, it is possibleto virtually eliminate flankingtransmission at this point.

• Metal stud partition junctionswith timber/steel joist floors

Sound insulation can becatastrophically reduced ifpartitions are built directly offcontinuous floor boarding orbeneath continuous ceilings. Inorder to overcome theseproblems, it may be necessary toconsider the use of independentfloating floors and “broken”ceilings fixed on resilient bars.

• Metal stud partition junctionswith concrete floors

Building partitions off non-bonded screeds, floating screedsor lightweight concrete floors can

result in undesirable flankingtransmission. The optimum designis to build directly off thestructural floor and then installfloating screeds or timber floatingfloors in each room.

Continuous concrete floors bi-passing above a separating wallcan have similar effects.Suspended plasterboard ceilingscan again be used to good effect.

• Metal stud partition junctionswith masonry walls

When a metal stud partitionmeets a continuous masonry leaf,the partition including its liningsshould be installed prior to themasonry wall linings. In order tominimise flanking transmission,consideration should be given toinstalling independent liningssuch as the Dryliner system ineach room.

• Metal stud partitions meetingwindow mullions

The use of continuous glazingsystems incorporating narrow orhollow lightweight windowmullions at which partitions areterminated is not conducive toachieving good levels of soundinsulation. Where this detail isconsidered necessary forarchitectural purposes, detailsmay be available which minimisethe problem.

• Inadequate masonry walls

Inadequate masonry walls can besuccessfully upgraded usingindependent linings such as theDryliner system. In such situations,it will also be necessary toconsider flanking transmissionpaths at floor / ceiling level andalso the use of independentlinings on masonry leaves whichthe separating wall abuts.

• Doors in partitions

For practical and economicalreasons, it is not generallypossible to maintain the soundinsulation of a partition in whicha door is installed. Where thisresults in privacy or annoyanceproblems, the use of lobbies /double doors can often proveeffective.

For school classrooms, hotels andhospital wards there is arequirement to fit heavy doorswith seals built into the doorframe set. This is known as a 30 dB door system.

18



Acoustics

Site TestingBuilding Regulations ApprovedDocument Part E originally proposedon-site testing of all sound resistingseparating walls and floors betweendwellings, flats and rooms forresidential purposes. These includenot only flats and housesconstructed in-situ but also ‘factory-built’ modules transported to site ina complete or partially built state.

Sound testing is not required forinternal walls and floors withindwelling houses and flats.

Performance standards for separating walls, separating floors, and stairs with a separating function

Airborne Impactsound insulation sound insulation

DnT,w + Ctr LnT,w

(dB minimum (dB maximumrequirement) requirement)

Purpose built dwelling-houses and flats

Party walls 45 –

Separating floors and stairs 45 62

Dwelling-houses and flats formed by a material change of use

Party walls 43 –


Purpose built residential rooms

Partitions 43 –


Residential rooms formed by a material change of use

Partitions 43 –


Laboratory values for new internal walls, partitions and floorsAirborne sound insulation

Rw

(dB minimum requirement)

Internal walls and partitions 40

Internal floors 40

on behalf of Building Control andundertakes limited pre-completionacoustic testing nationally to ensurecontinued compliance with theRegulations. Note that registrationand plot fees must be done inadvance of works being started.

The Robust Details cover standardfloor and wall constructions andnumerous elements within themsuch as junctions, sockets, flues anddownlighters. RD’s have beendeveloped specifically for new buildhouses and flats by theHousebuilders Federation, workingin conjunction with leading acousticsspecialists at Napier University,Edinburgh. 30 on-site tests of the relevantdesign had to be successfullycompleted and independentlytested, in order for each detail to beaccepted as an RD. To meet thestringent requirements set, eachdetail must demonstrate soundinsulating performance 5 dB greaterthan the lowest performancerequirement to meet the level ofadequate sound insulation requiredin Approved Document E.

Robust Details Limited opened forbusiness in May 2004 and allowsbuilders and designers to obtaincopies of the RD handbook, toregister plots and fee payment inadvance of the start of buildingwork. RD registered solutions or pre-completion acoustic testing becamemandatory from 1st July 2004,within Approved Document E forEngland and Wales.

Scotland and NorthernIrelandRegulations currently remainunchanged and are therefore notaffected by the England and Walesacoustic changes defined withinApproved Document E.

Effects of sound reduction values on audibilityRw Noise Level

30dB Normal conversation can be distinguished

35dB Loud conversation can be distinguished

40dB Loud conversation can be heard but not distinguished

45dB Loud conversation can be heard

50dB Shouting can be heard but not distinguished

55dB All speech is totally unheard with a high level of privacy from other domestic noise

60dB High level of privacy including noise from Hi-Fi and digital television

Robust Details (RD)In order to ease the burden oftesting, whilst maintainingstandards, a series of Robust Details(RD’s) have been devised forseparating/party walls and floors.These are industry standardconstruction designs, which areautomatically accepted by BuildingControl through a registrationsystem via the company, RobustDetails Ltd, that has been set up inconjunction with the ODPM. Thisscheme grants approval in advance



19

1

Thermal

Thermal Advice – Part LThere is a massive need to reducegreenhouse gas emissions. In 1997,the UK played a leading role in thenegotiations that led to the Kyotoagreement and as part of thatcommitment, set its CO2 targetbeyond that of the agreement. Theaim of the changes is to significantlyimprove the energy efficiency of allnew buildings, extensions andalterations to existing buildings.

A guide to the implications ofApproved Document L

Approved Documents L1 and L2 ofthe Building Regulations came intoeffect on 1st April 2002.

Main objectives

• Reduce Carbon Dioxide (CO2)emissions

• Improved design flexibility withinthe building process

• Minimised technical risk

• Avoidance of excessive cost

Compliance

There are three methods ofcompliance:

• The Elemental Method

• The Target U-value method

• Carbon Index Method

After introduction all house designsshould be upgraded to conform tothe new regulations. The mostchallenging area will be inrefurbishment, where it is mostlikely, due to the inability toradically alter the existing design,the Elemental Method ofcompliance will be used.

Thermal Advice - ExternalWallsBuilding Regulations place greateremphasis than ever before on thethermal insulation performance ofwalls and partitions in domesticproperties. Part L is designed toassist in reducing Carbon Dioxideemissions, provide improvedflexibility within the build process,minimise technical risk and avoidexcessive cost. Adoption ofthermally efficient drywallconstructions can make a majorcontribution to achieving theseobjectives. The advantages ofopting for a drywall solutioninclude:

• Availability of a range of thermallaminates to suite differentspecification needs

• The ability to fix wall lining andinsulate in a single operation

• Fully-filled, partially filled andclear cavity design options

• Effective means of upgradingsolid wall constructions

• Insulation is located on the innerleaf, giving a better ‘response’ tochanging temperaturerequirements

Lafarge Thermalcheck wallboardsinclude boards bonded to expandedpolystyrene, extruded polystyreneand phenolic foam with or withoutvapour barriers, to meet a widerange of performance requirements.There are many different forms ofconstruction, combinations ofmaterials and methods ofapplication. The prescribed methodsof calculating thermal efficiency arecomplex and generally are

U-values (W/m2K) for the Elemental MethodCentral heating Other heatingwith required systems(1)

Element SEDBUK value (Scotland only)

Pitched roof with insulation between joists 0.16 0.16

Pitched roof with insulation between rafters 0.20 0.18

Flat roofs 0.25 0.22

Walls 0.35 (England & Wales) –

0.30 (Scotland) 0.27

Floors 0.25 0.22

Windows/doors/rooflights

In wood or PVC frames (area weighted average) 2.0 1.8

In metal frames (area weighted average) 2.2 1.8

(1) Other gas or ‘central’ heating systems, or any electric heating system or solid fuel central heating system or undecided– these U-values are applicable only to Scotland

undertaken with the aid ofcomputer software. In this manualwe show constructions for severalcommon types of traditionally builtwall. Drywall systems are equallywell suited to use in conjunctionwith timber frame and metal frameconstructions.

Future Regulation changesThe ODPM have produced a draftpaper with the view to changing theApproved Document L Regulationsfrom 1st January 2006.

The draft proposals are afundamental change in the methodof the thermal calculation which,when adopted, will no longer allowElemental or Target U-valuedemonstrated compliance but will require a “whole building”calculation, such as SAP 2005, in allnew build and extensions of a sizeequal or greater than 100m2.

20



Case Study

Ster Century cinema, Cardiff

Client: Ster Century

Drywall contractor: Ultimate Finishing Systems

Main contractor: Taylor Woodrow

Cardiff’s new Ster Century multiplex cinema is a 14 screen complex designed toexacting sound insulation standards. It provides an impressive 73 dB soundreduction between auditoria and 60 dB Rw for the external envelope. Some85,000 square metres of Lafarge Plasterboard systems have been used toachieve the sound and fire protection criteria set for the project whichabuts the Cardiff Millennium Stadium. Partitions are built on two 90mmmetal studs and faced with three layers of boards - 19mm plank, 15mmdBcheck and 15mm Firecheck. A unique acoustic brace is used tobrace the studs and provide an effective sound break.

LININGS 2

TECHNICAL ENQUIRYLINE t 01275 377789 f 01275 377456 www.lafargeplasterboard.co.uk22

L I N I N G SINTRODUCTION

Drylining to solidbackgroundsLafarge Plasterboard lining systemsare quick, economical to install anddramatically reduce the amount ofwater used in wall construction.Systems incorporating LafargeThermalcheck boards have a muchbetter thermal response thanconventional wet constructions, sothey are less prone to surfacecondensation.

Linings to external walls providethermal insulation, control of watervapour and condensation risk innew build or renovation work.

They correct minor surfaceirregularities and provide a smoothlevel wall surface suitable for directdecoration.

Lafarge Plasterboard lining systemsare not suitable for the isolation ofdampness or for continuousexposure to moisture.

Lafarge Direct BondDirect bonding is used with LafargeEcheck, Lafarge Standard or LafargedBcheck wallboard up to 15mmthick, up to 1200mm wide, formasonry backgrounds, using LafargeBonding Compound or LafargeMulti Purpose Adhesive. Quick toapply, this method can be used tocorrect minor irregularities in drysubstrates.

Lafarge Thermalcheck Linings

For increased thermal insulationThermalcheck plasterboard can bedirect bonded to masonrybackgrounds using Lafarge MultiPurpose Adhesive (MPA) and asecondary fix of two nailable plugs.Thermalcheck plasterboards can alsobe fixed to Cormet metal systemsand timber framing.

ContentsPerformance Tables 23

Direct Bond 29

Cormet Metal Furring Lining 38

Cormet Dryliner 41

Cormet Independent Lining 47

Timber Frame 55

Structural Steel Frame 59

Contour Linings 63

What Can Go Wrong Checklist 67

Cormet Metal FurringSystemThe Cormet Metal Furring system isused for mechanical fixing ofplasterboards not suitable for directbonding, ie Lafarge Vapourcheckwallboard, Lafarge Moisturecheckwallboard and thermal laminates.this system provides a highperformance wall lining with betterthermal insulation properties andhigher water vapour resistance.

Cormet metal furring channels areadhesive fixed, using LafargeBonding Compound or LafargeMulti-Purpose Adhesive, to thebackground. The plasterboard ismechanically fixed to the furrings.Alternatively, where the substratewill not provide a reliable bond,Cormet Dryliner system should beused.

The system is not suitable for solidbrick external walls subject to risingor ingressing damp.

Cormet Dryliner SystemCormet Dryliner is a completely drysystem for drylining walls. It is fixeddirectly to the existing wall,allowing a cavity width between thewall and plasterboard lining rangingfrom 20mm to 130mm.

It is a simple, quick and cost-effective system that provides asimple means of achieving a flatsurface irrespective of the conditionof the substrate. It offers particularbenefits in refurbishment workwhere walls are out of true.

System selection

Common application areas:

Residential: New Housing ■ ■ ■ ■ ■ –Flats ■ ■ ■ ■ ■ –Renovation ■ ■ ■ ■ ■ ■

Commercial: Offices ■ ■ ■ ■ – ■Entertainment ■ ■ ■ ■ – ■Institutional ■ ■ ■ ■ – ■Shops ■ ■ ■ ■ – ■

Industrial: Factories ■ ■ ■ – ■ –Warehouses ■ ■ ■ – ■ –

Specialist: Cinemas ■ ■ ■ – – –Hospitals ■ ■ ■ – ■ –

Dir

ect

bond

Corm

et D

rylin

er

Corm

et In

depe

nden

tTi

mbe

r Fr

ame

Cont

our

Lini

ngs

This system allows air movementwithin the cavity and so minimisesthe risk of damp penetration.

Cormet Independent WallLiningThe Cormet Independent WallLining system is especially suited toreinforced concrete walls and steelframed walls. Fixed clear of theexternal wall, it allows space forservices, or for high levels of thermaland acoustic insulation. It may alsobe used where the external wall hassuffered damp ingress, but thentreated with appropriate dampproofing systems.

Timber Framed WallsLafarge plasterboards may be usedas a lining fixed direct to timberframes, in association with thermalinsulation and a vapour control layer.

Steel Framed WallsLafarge plasterboards may be usedas a lining fixed direct to steelframes, in association with thermalinsulation and a vapour control layer.

Lafarge Contour LiningsFor a fast, cost-effective and space-saving method of lining unsightlywalls and ceilings, Lafarge Contourwallboard, 6mm thick, can be directbonded to most flat and stablebackgrounds with Lafarge DrywallAdhesive.

Stee

l Fra

me

Max

imum

hei

ght

(m)

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6, a

nd B

S EN

136

4U

-val

ue (

W/m

2 K)


L I N I N G S

2

23

Performance tables

RFL 17

RDL 02

RDS 08

External wall: 100mm brickwork with 75mm cavity

Internal framing: 38 x 89mm timber studs at 600mmcentres with breather membrane on 11mm plywoodsheathing tied to brickwork with proprietary channel and tie

Lining: one layer 12.5mm Lafarge Standard wallboard

Insulation: one layer 100mm glass mineral wool density 24 kg/m3 between studs


Internal wall: 100mm Celcon Solar Blocks

Lining: 55mm Lafarge Thermalcheck XP wallboard onDirect Bond system with 10mm cavity

Masonry: sand/cement render on solid 215mm concreteblockwork, density 2300 kg/m3

Lining: 60mm Lafarge Thermalcheck K wallboard onCormet Dryliner Channel, forming 75mm cavity

2.4 301 0* 0.32

0*

5.2 342 0* 0.34

0*

5.2 300 0* 0.33

0*

Table 2.1 Thermal lining solutions for external walls to meetBuilding Regulations Approved Document L: 2002

System reference Specification

Note:

Fire resistance to drylining cavity * BS 476: Part 22 * BS EN 1364-1

Performance values are for imperforate, jointed systems using only Lafarge components and installed to the Lafarge specification given. Any alterations maywell impair the quoted performance criteria.

RDL 01

RFL 51

External wall: 100mm brickwork with 25mm cavity andstandard wall ties with insulation clips

Internal wall: 150mm Celcon Solar Blocks and 25mm PRinsulation

Lining: 12.5mm Lafarge Standard wallboard on DirectBond system with 10mm cavity


Internal framing: 150mm steel load bearing studs at600mm centres with breather membrane on 25mmLafarge Thermalcheck Sheathing wallboard tied tobrickwork with proprietary channel and tie

Lining: inner layer 12.5mm Lafarge Vapourcheck wallboard,outer layer 12.5mm Lafarge Firecheck wallboard

Insulation: one layer 150mm glass mineral wool density10.5 kg/m3 between studs

5.2 325 0* 0.34

0*

4.2 350 60* 0.34

60*


L I N I N G S

Performance tables

Table 2.2 Thermal lining solutions for roofs to meet BuildingRegulations Approved Document L: 2002

Wei

ght

(kg/

m2 )

U-v

alue

(W

/m2 K

)

Rafters: 47 x 100mm at 600mm centres with noggings

Insulation: 50mm glass mineral wool quilt density 16kg/m3

Ceiling: 50mm Lafarge Thermalcheck K insulatingwallboard

System reference Roof specification

RIR 01 7.3 0.30

Rafters: 47 x 100mm at 600mm centres with noggings

Insulation: 75mm glass mineral wool quilt density10.5kg/m3


RIR 02 7.5 0.20

Joists: 47 x 150mm at 600mm centres with noggings

Insulation: 75mm glass mineral wool quilt density 10.5 kg/m3


RIR 04 7.3 0.25

RIR 03 Trusses: 38 x 100mm at 600mm centres with noggings

Insulation: 100mm glass mineral wool quilt between joists, 50mm glass mineral wool quilt over joists density 10.5-16 kg/m3


7.5 0.16

Ceilings under flat roofs

Ceilings under pitched roofs

Horizontal ceiling at apex of roof

Note:



L I N I N G S

2

25

Performance tables

Max

imum

hei

ght

(m)

Table 2.3 Cormet Dryliner to upgrade existing external walls

External wall: 100mm brickwork or blockwork

Internal wall: 100mm concrete blockwork, density 2300 kg/m3

Lining: 12.5mm Lafarge Standard wallboard on CormetDryliner Channel

Insulation: 50mm glass mineral wool, density 24 kg/m3


RDS 03 5.2 0* 0.52

0*

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4


Lining: 12.5mm Lafarge Vapourcheck wallboard on CormetDryliner Channel


RDS 04 5.2 0* 0.60

0*



RDS 08 5.2 0* 0.33

0*

Notes:



When using Cormet Dryliner system in conjunction with mineral wool, ensure a 10mm cavity between inner leaf and back of insulation.

U-values differ according to density of brickwork, blockwork or mineral wool. To confirm details contact our Technical Enquiryline on 01275 377789.

All calculations are in accordance with Building Regulations: Conservation of fuel and power, Approved Document L 2002 edition.

The maximum heights given in these tables refer to the background construction. The Lafarge Dryliner system can be safely used up to a height of 6.5m.

U-v

alue

(W

/m2 K

)

Masonry: 215mm brickwork


RDS 09 5.2 0* 0.34

0*


Lining: 12.5mm Lafarge Vapourcheck wallboard on CormetDryliner Channel

Insulation: 100mm glass mineral wool, density 10.5 kg/m3

RDS 10 5.2 0* 0.33

0*


L I N I N G S

Performance tables

Max

imum

hei

ght

(m)

Table 2.4Cormet Dryliner to upgrade internal walls


Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (

R w d

B)

(Ctr

dB if

app

licab

le)

Masonry: 102mm brickwork with plaster finish to one side,50mm cavity

Lining: Cormet Dryliner Standard Reach with two layers12.5mm Lafarge dBcheck wallboard


RDS 23 3.0 60* 65 202

30* -7 Ctr

Masonry: 102mm brickwork with plaster finish to one side,50mm cavity

Lining: Cormet Dryliner Standard Reach with one layer12.5mm Lafarge dBcheck wallboard


RDS 24 3.0 30* 60 177

0* -9 Ctr


Lining: Cormet Dryliner Standard Reach with one layer12.5mm Lafarge dBcheck wallboard

RDS 31 3.0 0* 49 140

0*


Lining: Cormet Dryliner Standard Reach with one layer12.5mm Lafarge dBcheck wallboard on both sides


RDS 32 6.2 30* 59 177

0*

Masonry: 215mm solid dense aggregate blockwork,minimum density 2300 kg/m3

Lining: Cormet Dryliner Channel with one layer 12.5mmLafarge dBcheck wallboard on both sides


RDS 21 6.2 30* 62 290

0* -17 Ctr

Masonry: 100mm double leaf blockwork, density 1400 kg/m3 , 50mm cavity

Lining: Cormet Dryliner Channel with one layer 12.5mmLafarge dBcheck wallboard on both sides


RDS 22 6.2 30* 63 325

0* -15 Ctr

Separating walls (NON Robust Details)

Min

imum

thi

ckne

ss (

mm

)

Notes:



When using Dryliner system in conjunction with mineral wool, ensure a 10mm cavity between inner leaf and back of insulation.


L I N I N G S

2

27

Performance tables

I Stu

d re

fere

nce

Table 2.5Cormet Independent Linings (non loadbearing)


Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

4

Max

imum

hei

ght

(m)

26 IS50/R 2.7 60* 0.44IS60/B 3.9IS70/B 4.5 60*IS90/B 5.4

RCL 04

RCL 05

Outer leaf: Profiled metal cladding

Studs: Cormet I Studs at 600mm centres

Lining: inner layer 12.5mm Lafarge VapourcheckFirecheck wallboard, outer layer of 12.5mm LafargeFirecheck wallboard or Lafarge Megadeco wallboard

Insulation: 100mm glass mineral wool density 10.5 kg/m3

Outer leaf: 100mm brickwork or blockwork λ =0.84 W/mK


Lining: inner layer 12.5mm Lafarge VapourcheckFirecheck wallboard, outer layer of 12.5mm LafargeFirecheck wallboard or Lafarge Megadeco wallboard


26 IS50/R 2.7 60* 0.47IS60/B 3.9IS70/B 4.5 60*IS90/B 5.4

Wei

ght

(kg/

m2 )

RCL 17 Construction: 102mm Brickwork, with a λ of 0.752 W/mk

Lining: independent Cormet I Studs with inner layer of12.5mm Lafarge Standard wallboard, outer layer 12.5mmLafarge Standard wallboard or Lafarge Predecowallboard

Insulation: 25mm glass mineral wool density 16 kg/m3,cavity 50mm

250 IS50/R 2.7 30* 0.97IS60/B 3.9IS70/B 4.5 30*IS90/B 5.4

(Upgrade to existing brick wall)

Notes:




All calculations are in accordance with Building Building Regulations: Conservation of fuel and power, Approved Document L 2002 edition.

The maximum heights shown are for maximum spans between background bracing. For further information contact our Technical Enquiryline on 01275 377789.

U-v

alue

(W

/m2 K

)

26 IS50/R 2.7 60* 0.31IS60/B 3.9IS70/B 4.5 60*IS90/B 5.4

RCL 21 Outer leaf: 300mm concrete


Lining: inner layer 50mm Lafarge Thermalcheck Kwallboard, outer layer 12.5mm Lafarge dBcheckwallboard

Insulation: 50mm glass mineral wool density 24 kg/m3

Soun

d in

sula

tion

(R w

dB)

(Ctr

dB if

app

licab

le)


L I N I N G S

Performance tables

Max

imum

hei

ght

(m)

Table 2.6Framed external walls, loadbearing


Fire

res

ista

nce

of in

ner

leaf

(m

inut

es)

to B

S 47

6, a

nd B

S EN

136

5

Wei

ght

(kg/

m2 )

RFL 02

RFL 03

Lining: one layer 15mm Lafarge Vapourcheck Firecheckwallboard or Lafarge Vapourcheck Megadeco wallboard

Insulation: 90mm glass mineral wool density 16 kg/m3,λ= 0.037 W/mK

Lining: inner layer 12.5mm Lafarge Vapourcheckwallboard, outer layer 12.5mm Lafarge Firecheckwallboard or 12.5mm Lafarge Megadeco wallboard

Insulation: 90mm glass mineral wool density 16 kg/m3,λ= 0.037 W/mK

195 2.4 30* 0.39 51

30*

204 2.4 60* 0.38 53

60*

RFL 15

RFL 16

Lining: one layer 15mm Lafarge Vapourcheck Firecheckwallboard or Lafarge Vapourcheck Megadeco wallboardon Cormet Resilient Bar at 400mm vertical centres

Insulation: 90mm glass mineral wool density 16 kg/m3,λ=0.037 W/mK

Lining: inner layer 12.5mm Lafarge VapourcheckFirecheck wallboard, outer layer 12.5mm LafargeFirecheck wallboard or 12.5mm Lafarge Megadecowallboard on Cormet Resilient Bar at 600mm verticalcentres

Insulation: 90mm glass mineral wool density 16 kg/m3,λ=0.037 W/mK

215 2.4 30* 0.35 60

30* -5 Ctr

230 2.4 60* 0.34 61

60* -4 Ctr

Notes

Fire resistance to drylining cavity * BS 476: Part 21 * BS EN 1365



All calculations are in accordance with the Building Regulations: Conservation of fuel and power, Approved Document L, 2002 edition

U-v

alue

(W

/m2 K

)

Timber

RFL 51 External wall: 100mm brickwork with 75mm cavity

Internal framing: 150mm steel load bearing studs at600mm centres with breather membrane on 25mmLafarge Thermalcheck Sheathing wallboard tied tobrickwork with proprietary channel and tie

Lining: inner layer 12.5mm Lafarge Vapourcheck wallboard,outer layer 12.5mm Lafarge Firecheck wallboard

Insulation: one layer 150mm glass mineral wool density10.5 kg/m3 between studs

350 4.2 60* 0.34 59

60*

Structural steel frame, loadbearing

Direct bonding of plasterboardprovides a fast, efficient means oflining masonry and offers a drysolution calling for skills morereadily acquired than traditionalplastering. Extensively used involume house building, andsmaller projects, for more than 30years it continues to provide ahighly cost-effective means ofcomplying with BuildingRegulations.


L I N I N G SDIRECT BOND

2

29



System assembly

Adhesive Choice

The choice between LafargeBonding Compound or LafargeMulti Purpose Adhesive will dependon the type of background as shownin table 2.8.

Apply adhesive to the walls asshown on page 31: vertical dabs at300mm centres to the full height.Horizontal rows spaced as listed intable 2.7. Dabs should be 50 to75mm wide, 250mm long, and25mm in from the board edges toavoid bridging of joints by theadhesive. The contact area of thedabs must be at least 20% of theboard area.

Certain floor/ceiling constructionscan allow the circulation of airbehind the boards and air may alsoenter at junctions with partitionsand door/window frames. Thiscirculation can reduce the thermalperformance of the wall. Building Regulations Approved

Document L requires the applicationof continuous horizontal andvertical bands of adhesive aroundelectrical sockets, windows, thespecified wall perimeters, junctionsand frames of linings to internalfaces of external walls.

A continuous band of adhesive atthe floor line will ensure a solid basefor skirting boards.

If a cavity barrier is required, formthis by applying a continuousvertical ribbon of adhesive.

Electrical cables should be protectedby conduit.

Depth limitation

Minimum finished dab thickness10mm, maximum 25mm.

Lafarge Direct BondLafarge Echeck, Lafarge dBcheck,Lafarge Firecheck or LafargeStandard wallboard, up to 15mmthick and 1200mm wide can bedirect bonded to suitable clean, dustfree masonry backgrounds usinggypsum-based Lafarge BondingCompound or Lafarge Multi PurposeAdhesive. This method is quick toapply and can be used to correctminor irregularities in the substrate.

Performance

The selection of the dryliningsystem, thermal laminate orwallboard will depend on the wallheight and the performancerequired for fire resistance, thermaland sound insulation: refer to theperformance table 2.1.

Fire spread

Lafarge plasterboards andcomponents are defined as Class 0 in accordance with the NationalBuilding Regulations 1991 ApprovedDocument B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1987 and Euroclass A2.

Lafarge gypsum-based bondingadhesives and jointing compoundsare non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Limitations

This method of fixing is notrecommended for solid externalwalls subject to the ingress ofmoisture. If ingress cannot be fullyeliminated, then use the CormetIndependent Wall Lining System orCormet Dryliner System.

Lafarge Vapourcheck wallboard,Lafarge Toughcheck, LafargeMoisture Resistant Firecheck,Lafarge Hydrodeco and LafargeMoisturecheck wallboard are notsuitable for direct bonding andshould be be mechanically fixed.

See the Cormet Dryliner system forquick and cost effective mechanicalfixing of plasterboards to solidbackgrounds. See page 37.

The maximum installation height for this system should not exceed 3 metres.

Table 2.7 Application of Lafarge Bonding Compound or LafargeMulti Purpose Adhesive (MPA)

Board Board Row Rows of dabsthickness (mm) width (mm) centres (mm) per board

9.5 900 450 3

9.5 1200 400 4

12.5 900 450 3

12.5 1200 600 3

Table 2.8Bonding adhesive selection for Standard wallboards

Background Typical type Pre-treatment Adhesiveexamples

High suction Aerated or PVAC bonding Lafargemasonry lightweight agent Bonding

aggregate Compoundconcrete blocks

High suction Aerated or None Lafargemasonry lightweight Multi

aggregate Purposeconcrete blocks Adhesive

Low and Common clay and None Lafargemedium suction concrete blocks Bondingmasonry high density clay Compound

and concrete blocks,

Smooth precast Remove shutter oil and concrete contaminants. Abrade

to form rough surface and pretreat with a pvac bonding agent

Very low High strength PVAC bonding Lafargesuction masonry concrete agent Bonding

Compound

PVAC treated – – Lafargesurfaces Bonding

Compound

Notes:

1. Extremely smooth surfaces may require abrasion prior to PVAC treatment.

2. Surfaces must be free of mould oil and dust. Contaminated surfaces may require chemicalcleaning. Painted surfaces are not suitable for direct bonding.

Introduction

System components: See section:

BoardsCompoundsScrews

8

Finishes 7



2

31

Continuous ribbon of Lafarge BondingCompound or MultiPurpose Adhesivearound wallperimeter requiredon external walls

Drylining, direct bond

Application details

Boarding

Start boarding from a window, doorreveal or internal angle. Press theplasterboard with the grey face tothe wall firmly against the dabs,checking that it is true and vertical.Fit the board tight against theceiling and temporarily wedge thebottom edge in position until thecompound has set.

Note that Lafarge IntumescentAcoustic Sealant should be appliedto the perimeter of all drylinedareas.

Movement control joints

Movement control joints arerequired in wall linings at intervalsnot exceeding 10 metres, and wherethe drylining crosses or abuts astructural movement joint.

At movement control joints leave a12.5mm opening between theplasterboards and apply acontinuous vertical ribbon ofLafarge Bonding Compound orLafarge Multi Purpose Adhesive oneach side of the joint, about 25mmin from the edge of the plasterboard.

Cut Lafarge Movement Joint tolength: butt joint lengths end to endwhere necessary. Attach to theplasterboard surface with 13mmgalvanised or stainless steel staplesat 150mm centres. Apply LafargeFast Set in two coats, feathering outthe edges of the second coat.Finally, remove the masking stripfrom the centre of the movementjoint after finishing with suitableLafarge jointing compound, e.g.Lafarge Readymix Lite.

Bonding dabspacings: see table 2.7

Continuous perimeterribbon of LafargeBonding Compoundor Multi PurposeAdhesive

Drylining, direct bond

50

250

50-75

25Drylining, detail at electric socket

Electrical back boxfully enclosed withBonding Compoundor Multi PurposeAdhesive

Cut out forelectrical box

900 wide

Application details



Internal corner External corner

Door jamb

Junction with timberframed partition

Window opening

Continuous band of LafargeBonding Compound or MultiPurpose Adhesive at floor levelto provide support for skirting

Blockwork

Lafarge BondingCompound or Multi

Purpose Adhesive

Junction with metalstud partition

Blockwork

Continuous ribbon ofLafarge Bonding

Compound

Lafarge Nailable Plug

Cormet C Stud

Skirting

Plasterboard finished 5mmshort of floor level and gapsealed with LafargeIntumescent Acoustic Sealant

Lafarge IntumescentAcoustic Sealant



L I N I N G SDIRECT BOND – THERMALCHECK

2

33

Introduction

Application of bonding adhesive

Continuous ribbonof MPA around wallperimeter

MPA dabs (4 verticalcolumns per board)

Lafarge ThermalcheckLinings: Direct BondLafarge Thermalcheck, ThermalcheckXP and Thermalcheck K can be fixedto masonry using direct bond,Cormet Dryliner, Cormet IndependentWall Lining or timber battens.

Thermal transmittance (U) values fortypical constructions using LafargeThermalcheck boards are shown intable 2.1.

Direct bonding

Apply Lafarge Multi PurposeAdhesive (MPA) direct to any newmasonry background. Surfaces ofvery low suction, such as highstrength concrete may requiretreatment to form a key for theMPA. Refer to table 2.8 for guidance.

Contaminated surfaces may requirechemical cleaning.

Direct bonding to existingplasterwork needs extra care

Plasterwork in good condition canaccept direct bonding providing thatthe background is sound and anypaintwork is sanded back and thewhole area treated with a PVACbonding agent applied inaccordance with the manufacturersinstructions.

Loose plasterwork needs to behacked off completely and theremaining substrate treated with aPVAC bonding agent in accordancewith the manufacturers instructionsbefore applying MPA.

Limitations

This method of fixing is notrecommended for solid externalwalls subject to the ingress ofmoisture. If ingress cannot be fullyeliminated then use the CormetIndependent Lining system.

This system is also unsuitable onsolid walls with external render orareas subject to severe frosts.

See the Cormet Dryliner system forquick and cost effective mechanicalfixing of plasterboards to dampsolid backgrounds which are in theprocess of drying out.

Maximum installation height for thissystem should not exceed 3 metres.

System assembly

Adhesive application

Apply MPA to the wall in verticaldabs at 300mm centres. Dabs shouldbe 50 to 75mm wide, about 250mmlong, and about 25mm in from theboard edges to avoid bridging ofthe joint by the MPA. Dabs shouldbe applied up to 25mm thick toallow for tamping Lafarge ThermalLaminate into alignment and toprovide a 10mm cavity betweensubstrate and board. The contactarea of the bands of compound mustbe at least 20% of the board area.

Certain floor/ceiling constructionscan allow the circulation of airbehind the Lafarge Thermalcheckboards and air may also enter atjunctions with partitions and

door/window frames. Thiscirculation can reduce the thermalperformance of the wall. BuildingRegulations Approved Document Lrequires the application ofcontinuous horizontal and verticalbands of MPA around the specifiedwall perimeters, electrical sockets,windows, junctions and frames oflinings to internal faces of external walls.

A continuous band of adhesive atthe floor line will ensure a solid basefor skirting boards.

Electrical cables should be protectedby conduit.

Depth limitation

Minimum finished dab thickness10mm, maximum 25mm.

1200 wide




Junction with timber framed partition

Junction with metal stud partition

Boarding

Start boarding from a window, doorreveal or internal angle. Tamp thethermal laminate firmly against thedabs, checking that it is true andvertical. Fit the board tight againstthe ceiling and temporarily wedgethe bottom edge in position.

When the adhesive has set, drill two6mm diameter holes through theLafarge Thermalcheck board, MPAand masonry background. Holesshould be 300mm from top of boardand 25mm from board edges.Ensure holes penetrate masonry byat least 25mm. Insert LafargeNailable Plugs and drive them justbelow the plasterboard surfaceensuring that the plasterboard linerpaper remains intact. Remove thetemporary wedges. Refer to thediagram for positioning of LafargeNailable Plugs on page 35.

Lafarge Nailable Plugs are designedas a permanent fixing. They shouldpenetrate the background by aminimum of 25mm. The maximumcomponent thickness, includingplaster or render, MPA and thermallaminate that can be accommodatedby each size plug is as follows:

60mm Nailable Plug - 35mm



Note. Plaster or render should notbe treated as stable substrates.Nailable plugs must penetrate to aminimum depth of 25mm tosubstrate behind these finishes.

Jointing

All joints should be taped and filledin accordance with LafargePlasterboard’s instructions – seeSection 7.

Application details



2

35

Nailable plug fixing arrangement

2100

300

1200

25

Window opening Skirting

Continuous ribbon ofLafarge MultiPurpose Adhesive

Board finished 5mmshort of lower level


Nailable plug length calculation

• Plugs have a minimum 25mm depth intothe masonry

• Maximum dabs thickness 25mm

• Composite board + dab thickness + 25mminto substrate = nailable plug thickness

Application details

Drylining, detail at electric socket

Electrical back boxfully enclosed withLafarge Multi PurposeAdhesive

Cut out forelectrical box



Specification clauses

Lafarge Direct BondSystems

Scope

The direct bonding of Lafargeplasterboards, including LafargeThermalcheck boards to masonry orconcrete background using eitherLafarge Bonding Compound orLafarge Multi Purpose Adhesive.

Exclusions

This specification shall not be usedwhere backgrounds are or havebeen subject to damp penetrationor ingress, or/and where they arepainted.

Additional clauses

Add general clauses (see Section 8) ifrequired for:

• Expansion/movement joints

• Health and safety

• Storage of materials

• Site conditions and workmanship

NBS clauses

When using the NBS Specification,use clause K10 PLASTERBOARD DRYLININGS/PARTITIONS/CEILINGS.

The Lafarge Plasterboard websitecontains a full set of NBS clauses,completed for each LafargePlasterboard system. See:www.lafargeplasterboard.co.uk/nbssearch/index.asp

System reference (Insert Lafarge system reference from Performance tables)

Location ........................Client reference ........................PerformanceMaximum height ....................m

BackgroundThe background shall be free from dust, dirt, grease and must be dry. Anymould or source of damp penetration shall be traced and remedied prior todrylining.

AdhesiveWallboard: Lafarge Bonding Compound

Thermal laminates: Lafarge Multi Purpose Adhesive

(Delete as applicable)

Adhesive applicationApply adhesive in 250mm dabs at 300mm vertical centres in vertical rows.

Apply continuous ribbons of adhesive 50mm down from the ceiling and 50mmup from the floor.

Apply vertical bands of adhesive to perimeters of external walls of rooms andat perimeters of door, window and service openings.

BoardingSingle layer of wallboard to BS 1230: Part 1 (Until superseded by BS EN 520).

Lafarge (Specify wallboard from the Performance Tables)

Mechanical fixingSecondary fixing for thermal laminates: 2 Nailable plugs length ..........mmshould be inserted through the board and into the substrate, allowing aminimum 25mm penetration.

FinishingLafarge Taping and jointing system, or

Lafarge Supreme Skim Plaster, or

Lafarge Predeco taping and jointing system

InstallationAll materials, unless otherwise indicated, shall be supplied by lafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995

Notes:

Red text lists alternative productspecifications.

(Italic red text within bracketsgives advice on selecting theinformation needed).



2

37

Installation

Step oneApply a chalk lineto floor and ceiling,allowing for thethickness ofselectedplasterboard orthermal laminate,plus a minimum10mm of LafargeBondingCompound orLafarge MultiPurpose Adhesive.See table 2.8 forcorrect adhesive forthe backgroundsurface.

Step twoStarting from awindow, doorreveal or internalangle, mark wallvertically withchalk for the rowsof dabs at therequired centres, asset out in table 2.7.

Allow for dabs at25mm in fromboard verticaledges.

Step threeOn external wallsapply continuousperimeter ribbonof Lafarge BondingCompound orLafarge MultiPurpose Adhesiveat 50mm belowceiling line and50mm above floorlevel.

A continuousperimeter shouldalso be appliedaround any servicecut out i.e.electrical back box.

Step fourApply vertical dabsat required centreson the chalk lines.

Dabs should be 50to 75mm wide,about 250mm longat 300mm centresand between 10 to25mm thick.

The contact area ofdabs must be atleast 20% of theboard area.

Note: Apply enoughdabs to fix oneboard at a time.

Step fivePress plasterboardgrey face firmlyagainst the dabs,fitting the boardtight against theceiling. Temporarilywedge the bottomedge in positionusing offcuts.

At corners, align asshown in theapplication details.

Ensure tight buttjoints at junctions.

Step sixTamp board intoalignment withfloor and ceilingchalk lines using astraight edge.

Remove wedgeswhen thecompound hasdried (allow 8hours).

For thermallaminates, securewith two nailableplugs after LafargeMulti PurposeAdhesive has set.Refer to diagramon page 35.

1

2

3

4

5

6

Installation details on Lafargesystems are also available in theLafarge Installation Guide oronline at: www.lafargeplasterboard.co.uk


L I N I N G SMETAL FURRING

Cormet Metal FurringSystemThe Cormet Metal Furring system isused for mechanical fixing ofplasterboards not suitable for directbonding, ie Lafarge Vapourcheck.Lafarge Moisturecheck and ThermalLaminates. This system thus allowsthe provision of a high performancewall lining with better thermalinsulation properties and vapourresistance.

Cormet Metal Furring Channels aredirect bonded to the backgroundand the plasterboard is mechanicallyfixed to the furrings. The system issuitable for fixing all types ofplasterboards provided that thesubstrate remains dry.

The selection of the dryliningsystem, thermal laminate orwallboard will depend on the wallheight and the performancerequired for fire resistance, thermaland sound insulation: refer to theperformance table 2.1.

Fire spread


Lafarge gypsum-based bondingadhesives and jointing compoundsare non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Limitations

This method of fixing is notrecommended for solid externalwalls subject to the ingress ofmoisture.

Components

The range of components is listed intable 2.9.

The design of the Cormet MetalFurring Channel ensures highstrength and easy installation. Thebearing face has deep knurling foreasier screw fixing, which, combinedwith the board alignment guide,makes drylining quicker.

Introduction



8

Finishes 7

Continuous horizontal Cormet Metal FurringChannel and solid continuous band ofBonding Compound around all perimeters

Solid continuousband of adhesivearound window

Bonding Compound dabs200mm long at 450mm centres

Continuous horizontal Cormet MetalFurring Channel and solid continuousband of Bonding Compound aroundall perimeters

Vertical Cormet MetalFurring Channels at600mm centres

All joints tapedand filled

Drylining on Cormet Metal Furring System

Table 2.9 Cormet Metal Furring system components Component Lafarge code Size

Metal Furring Channel MFWC Length 2260mm

Bonding Compound Bond25 25 kg bags

Multi Purpose Adhesive ADHESIVE 25 kg bags



2

39

System assembly

Apply dabs of Bonding Compound200mm long at 450mm verticalcentres to the background. Forbackground preparation see theDirect Bonding method.

Locate Cormet Metal FurringChannels vertically at 600mmcentres for 12.5mm wallboard andnot more than 100mm from cornersand openings. Also apply theCormet Furring Channel sectionshorizontally at the ceiling and floorline between the vertical furrings.

Around reveals apply the wallboarddirectly with dabs of LafargeBonding Compound. For LafargeVapourcheck fix the FurringChannels vertically in reveals tosupport the boards. Smallbackground surface irregularitiescan be compensated for whenlevelling the furrings.

Application details


Door jamb

Window opening

Junction with metalstud partition

Blockwork

Cormet FurringChannel to support

partition stud

Lafarge Nailable Plug

Movement control joint


Compressiblepacking

Cormet Furring Channelnot more than 100mmfrom movement joint

Plasterboarddirect bondedto reveal




Cormet Metal FurringSystems

Scope

Mechanically fixing wallboards thatcannot be direct bonded. CormetFurring Channels bonded withLafarge Bonding Compound.

Exclusions

This specification shall not be usedwhere backgrounds are or havebeen subject to damp penetrationor ingress, or/and where they arepainted.

Additional clauses






NBS clauses



System reference (Insert Lafarge system reference from Performance tables)



Pre-treatmentRemove contamination, paint or loose material using chemicals and/orabrasion. Apply PVAC bonding agent to BS 5270.

Lining design thicknessThe design thickness of the lining from face of background to front face ofwallboard including adhesive thickness is .................mm subject to toleranceunder BS 8212: 1995.

Chasing out for servicesChase out to a minimum .................mm depth to accommodate services

Adhesive applicationApply Lafarge Bonding Compound in 250mm horizontal dabs at 450mmcentres between vertical rows, 50mm down from the ceiling and 50mm upfrom the floor.

Apply continuous ribbons of adhesive 50mm down from the ceiling and 50mmup from the floor.

Apply vertical bands of adhesive to perimeters of external walls of rooms andat perimeters of door, window and service openings.

Metal framingCormet Metal Furring Channels bedded in dabs of Lafarge BondingCompound vertical at 400mm horizontal centres.

BoardingSingle layer of wallboard. (Specify wallboard from the Performance Tables)

Board fixingLafarge screws at 300mm centres

Type Checkpoint Self-tapping, length, 25mm.





Notes:




L I N I N G SCORMET DRYLINER

2

41

The Cormet Dryliner systemprovides a simple means ofachieving a flat surface onirregular substrates. It also allowsthe creation of a cavity from25mm to 130mm to accommodateservices.

Equally suited to new build, itoffers particular benefits inrefurbishment work in period andlisted properties where walls areout of true.

Use of the system facilitates airmovement within the cavity andminimises the risk of damppenetration.


Dryliner Channel RD1

Dryliner SR Bracket RD2

Dryliner ChannelConnector RD3

Metal Angle MFC2330

Dryliner Track RD9Dryliner XR Bracket RD11

Table 2.10 Cormet Dryliner system components Component Lafarge code Length (mm)

Dryliner Channel RD1 2400, 2700

3000, 3600

Dryliner SR Bracket RD2 –

Dryliner XR Bracket RD11 –

Dryliner ChannelConnector RD3 100

Metal Angle MFC2330 3600

Dryliner Track RD9 3000

Pan Head Screws 11PHST25 11

Wafer Head Screw 14WHST25 14

1716

47

23

30

133

47

35

47

63 47

35


Introduction System components: See section:


8

Finishes 7

Cormet Dryliner SystemCormet Dryliner is a completely drysystem for drylining walls andceilings. It is a simple, quick andcost-effective system suitable formany internal applications.

As a wall lining Cormet Dryliner isfixed directly to the existingbackground, allowing a cavity widthbetween wall and plasterboardlining ranging from 25mm to130mm. Flexibility of cavity width isprovided by a choice of two framingmethods:

Standard Reach (SR-RD2) 25-60mm

Extended Reach (XR-RD11) 25-130mm

The system can therefore be usedfor all common lining applications:

• to allow for hidden services

• to provide high levels of thermalperformance

• to provide high levels of acousticperformance

• to level out uneven substrates

• can be fixed to wide range ofbackgrounds

As a ceiling lining the system can beeasily fixed to timber joists,providing high levels of fireprotection and sound reduction. SeeSection 4, Floors and Ceilings.

Performance

All Lafarge plasterboards andcomponents are defined as Class 0 inaccordance with the NationalBuilding Regulations 1991 ApprovedDocument B 1/2/3/4/5. Theplasterboards are defined asmaterials of limited combustibilityaccording to table A7 of Appendix Ain the above Approved Document.Lafarge jointing compounds, metalsystems, textures and bondingcompounds are non-combustiblewhen tested in accordance with BS 476: Part 4: 1970 and Euroclass A1.

For system performance data referto pages 23 and 25-26.

Components

The range of components is listed intable 2.10.

3020

19


2

43


Application details

Cormet Dryliner

Cormet DrylinerChannels screwfixed to dryliningbrackets usingLafarge Pan Headscrews

Cormet DrylinerBracket asrequired


Cormet DrylinerTrack fixed to floor

Cormet DrylinerTrack fixed to soffit

System assembly

For cavity widths 25 to 60mm, useCormet Standard Reach bracket RD2.

For cavity widths 25 to 130mm, useCormet Extended Reach bracket RD11.

Fix Cormet Dryliner Track RD9 at600mm centres to the floor andstructural soffit allowing forrequired cavity width. If applyingthe track directly to new concrete,the concrete must be dry, and adamp proofing membrane should beused.

Mark horizontal lines at 800mmcentres and then mark vertical linesat 600mm maximum centres (400mmfor thermal laminates) on the wallto locate Cormet Dryliner Brackets.Mark lines as close as possible tocorners. At internal corners allow forwidth of abutting lining.

Position Cormet Dryliner BracketsRD2/RD11 directly to wall atmaximum 800mm vertical centres onmarked lines. Tap-in anchors may beused but care must be taken NOT tohammer flat the stiffening ribs. Plugand screw fixings are preferred. Foldup legs and secure to wall withsuitable fixing through horizontalslot. Cut Cormet Dryliner ChannelRD1 5mm shorter than the floor toceiling height. Locate CormetDryliner Channel RD1 into CormetDryliner Track RD9 at floor andsoffit. Where wall height exceedschannel length, connect two lengthsof channel together with CormetDryliner Channel Connector RD3.

Ensure channel is plumb and secureto bracket by fixing each leg ofbracket to the channel using aLafarge Pan Head Screw (11PHST25).The slotted centre holes allowadjustment by loosening the screw,re-positioning the RD1 and re-tightening the screw. Pan headscrews must be used for thisapplication. Where necessary bendback the legs of the bracket so itdoes not protrude past the face ofthe channel.

Floor detail

Cormet DrylinerChannels screw fixed to brackets with LafargePan Head screws

Cormet Dryliner SR orXR Bracket fixed tobackground at 800mmvertical centres

Lafarge wallboard fixedto Cormet DrylinerChannels and Tracks

Cormet Dryliner Trackfixed to floor and soffit

Table 2.11 Framing centres Board Board Framingthickness width centres (mm) (mm) (mm)

12.5 1200 600

12.5 900 450

Lafarge Thermal Laminate 400





Dryliner Bracketadjusted for internal corner application

Internal corner

External corner

Window/door frame detail

Cormet DrylinerChannel

Cormet DrylinerBracket

ReinforcingCormetMetal Angle

Reinforcing Cormet MetalAngle

Cormet Dryliner Channel

Cormet Dryliner Bracket

Application details

Internal corners

At internal corners, where it is notpossible to screw fix one of the SRbracket legs to the Cormet DrylinerChannel, fix as shown in illustration.

External corners

At external corners, positionbrackets as close as possible to eachside of the corner, and attachCormet Metal Angle MFC2330vertically to horizontal dryliner trackwith Lafarge Wafer Head Screws.

Similarly reinforce all corners atwindow openings and featuredlinings. At openings, install CormetDryliner Channel and Cormet MetalAngle to accommodate the doorframe.

Insulation

Where required insert mineral woolinto the framing ensuring that themineral wool continues over thebracket to form one continuouslining. Fit the insulation prior tofixing the Cormet Dryliner Channels.

Boarding

Cut plasterboard 5mm shorter thanthe floor to ceiling height, buttfirmly against the ceiling and fix tothe framing with Lafarge DrywallScrews at 300mm centres. Alignwallboards, leaving a nominal 3mmgap between each other and centreedges of the plasterboard over thechannels. Where the lining is greaterthan the plasterboard length, useCormet MFIX Fixing Channel orCormet Flat Strap FS90/W to supportthe horizontal cut edges of theplasterboards. For double boardsystems use 50mm FS50/R CormetFlat Strap for horizontal jointsinstalled between the board layers.

For screw lengths see Section 8Sitework.

Jointing

Apply Lafarge Jointing Compoundto all joints either by hand or bymachine in accordance with LafargePlasterboard’s instructions.


2

45


Cormet Dryliner

Scope

The mechanical fixing of Lafargeplasterboards, including LafargeVapourcheck wallboard and LafargeThermalcheck boards to masonry orconcrete backgrounds.

Exclusions

This system may not be used onfriable or unstable backgroundswhere a sound mechanical fixing forthe brackets cannot be achieved.Also backgrounds subject tocontinuous damp ingress whichcannot be controlled/rectified.

Additional clauses






NBS clauses




System reference (Insert Lafarge system reference from Performance Tables)


Fire rating ....................mins (dependent on background)

Airborne insulation (dependent on background)

Thickness (dependent on background)

Horizontal jointsUse Cormet Fixing Strap FS50/R, FS90/W or Cormet Fixing Channel MFIX ifpartition height exceeds board height.

Insulation(Specify insulation thickness and grade/density from the Performance Tables)

Acoustic mastic6mm bead of Lafarge Acoustic Sealant around perimeter of the framing.

ChannelsLafarge Dryliner Channels reference RD1 at max 600mm centres.

Floor/head trackLafarge Dryliner Channels reference RD9 fixed at max 600mm centres.

Floor/head track fixingsSpit Pulsa 700P nailing system for concrete or steel using fixings dependent onmaterial substrates at max 600mm centres

Standard concrete use Spit C6 Pins (Select from 20, 25, 30, 35, 40)mm, or

Hard concrete use Spit HC6 Pins (Select from 17, 20, 22, 27)mm, or

Steel use Spit SC6 Pins (Select from 15, 20)mm

Spit Hammer-In fixing for concrete at maximum 600mm centres

Type Spit Hit CL35 (Select from 30, 40, 50)mm

BracketsLafarge Dryliner Brackets reference RD2, RD7 or RD11 secured at 800mmvertical centres.

Bracket fixingsSpit Pulsa 700P nailing system for concrete, block or steel using fixingsdependent on material substrates

Standard concrete, or block use Spit C6 Pins (Select from 20, 25, 30, 35, 40)mm,or Steel use Spit SC6 Pins (Select from 15, 20)mm

Spit Hammer-In fixings for concrete at max 600mm centres

Type Spit Hit M5 (Select from 27, 37)mm, or Spit Hit M6 (Select from 32, 39,52, 67)mm

BoardingSingle or double layer of wallboard.

Inner layer (Specify wallboard from the Performance Tables)

Outer layer (Specify wallboard from the Performance Tables)

Board fixingsLafarge screws at 300mm centres

Type Drywall Self-tapping, or Toughcheck Self-tapping, or Checkpoint Self-tapping, or Megadeco Self-tapping.

Length, inner layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm

Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm




InstallationAll materials, unless otherwise indicated, shall be supplied by LafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Given the vast selection of different types of substrate that are encounteredon-site, it is strongly recommended that adequate site tests be carried out toestablish a recommended load on fixings

Notes:





Step oneFix Cormet DrylinerTrack RD9 at 600mmcentres to the floor usingsuitable fixings. Allowfor required cavitywidth (25mm to130mm).

Note: If applying CormetDryliner Track directly tonew concrete, theconcrete should be dryand a damp-proofmembrane must be used.

Step twoFix Cormet DrylinerTrack RD9 to ceilingwith a suitable fixing,ensuring CormetDryliner Track RD9 atceiling is plumb withthat on the floor.

For 12.5mm wallboardmark horizontal linesat 800mm centresand vertical lines at600mm centres.Mark lines 50mm fromexternal corners. At internal cornersallow for width ofabutting wall liningand framing.

Step threeStarting at centre ofwall height, positionCormet DrylinerBrackets directly towall at maximum800mm verticalcentres on themarked lines. Secureeach bracket to wallwith a suitable fixing.

Step fourCut each CormetDryliner Channel RD15mm shorter thanthe floor to ceilingheight. LocateCormet DrylinerChannel RD1 intoCormet DrylinerTrack RD9 at floorand ceiling.

Step fiveEnsure channel isplumb, and secure to each bracket legusing Lafarge PanHead Self TappingScrews. Wherenecessary bend back the legs of thebracket so they donot protrude pastthe face of thechannel.

Step sixCut plasterboard5mm shorter thanthe floor-to-ceilingheight, butt boardfirmly against ceilingand fix plasterboardsto the framing withLafarge Drywall SelfTapping Screws at300mm centres.

Align wallboardsleaving a nominal3mm gap betweeneach other and centrethe edges over thechannels. Where theheight of the lining is greater than theplasterboard length,use Cormet FixingChannel MFIX orCormet Flat StrapFS90/W (or CormetFlat Strap FS50/R fordouble boardedsystems) to supportthe horizontal cut edges of the plasterboards.

1

2

3

4

5

6

Note: Ensure that the longer flange of bothCormet Dryliner Tracks ison the plasterboard side.

Where wall height exceedschannel length, connect two lengths of channel together with Cormet Dryliner Channel Connector RD3.


Installation


L I N I N G SCORMET INDEPENDENT

2

47

Cormet Independent Wall Liningsystems require reduced supportfrom other structural elements,provide a service void betweenlining and wall and can bespecified for projects up to 5.4metres in height. They avoid therisk of plasterboard joints crackingdue to background movement ofthe building. They are well suitedto a wide range of commercialand industrial constructions,particularly where fast-tracktechniques are adopted.

Cormet Independent Wall Lining iscommonly specified forapplications ranging fromfactories and warehouses tomultiplex cinemas.



Cormet C Studsat openingsand stop ends

Minimum 10mmcavity width

Mineral woolinsulation to beinserted intoframing (ifrequired)

Cormet I Studsfor main run ofwall lining

Timber sole plate (if required)on uneven floors

Cormet U Trackfixed at 600mmcentres

Cormet Independent Wall Lining

Introduction



8

Finishes 7

Cormet U Track fixed toCormet C studs at topand bottom to formhorizontal framing

Cormet Independent WallLiningsCormet Independent Wall Liningsystems combine the features ofother Cormet metal systems to givehigh strength and quickly assembleddrylining.

They are especially suited todrylining reinforced concrete wallsand steel framed walls. As they arefixed clear of the external wall theyallow space for services, or for highlevels of thermal and acousticinsulation within the cavity. They are also suited to renovation workwhere the existing wall may form an unsuitable substrate for othersystems.

The system uses Cormet I Studs,together with Cormet C Studs andCormet U Tracks as used in theCormet Metal Stud Partition system.Mineral wool batts can be insertedinto the framing to improve thethermal and acoustic performanceof the system.

Performance

The selection of drylining systems,insulation and boarding willdepend on the wall height and the performance required for fireresistance, thermal and soundinsulation: refer to performancetable 2.5.

Lafarge plasterboards andcomponents are defined as Class 0 in accordance with the NationalBuilding Regulations 1991 ApprovedDocument B1/2/3/4/5 (Fire Safety)and Building Standards (Scotland)regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1987.

Cormet metal sections and gypsum-based jointing compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970 and Euroclass A1.


2

49


Table 2.12 Cormet Independent Wall LiningComponents

Component Product Width Lengthscode (mm) (mm)

I Stud IS50/R 50 2400, 3000IS60/B 60 3600, 4200IS70B 70 3600, 4200IS90/B 90 6000, 7200

C Stud CS50/R 50 2400, 2700, 3000, 3600CS60/R 60 2400, 2700, 3000, 3600, 4200CS70/R 70 2400, 2700, 3000, 3300

3600, 4200, 4800CS90/R 90 2700, 3000, 3600, 4200CS90/W 90 4800, 6000, 7200

U Track UT52/R 52 3000UT62/R 62 3000UT72/R 72 3000UT92/R 92 3000

U Track Deep Flange* UDT52/B 52 3000UDT62/B 62 3000UDT72/B 72 3000UDT92/B 92 3000

Extra Deep U Track* UXT72/B 72 3000UXT92/W 92 3000

Lafarge Intumescent ACOUSTIC (INTU) 0.9 litre cartridgeAcoustic Sealant ACO 38 (INTU) 0.38 litre cartridge

Drywall Self-tapping 25 to 76screws

* For linings over 4.2m high, deep or extra deep tracks are recommended

Component specifications may vary from those shown.

Cormet Independent Wall Liningcomponents

36 34

50, 60, 70 and 90

50, 60, 70 and 90

40

52, 62, 72 and 92

30

52, 62, 72 and 92

50

6 6

C Stud

U Track Deep FlangeU Track

I Stud

Components

Components

The range of Cormet metalcomponents is shown and listed in table 2.12.

Colour coding is used to identifymetal thickness:

Red (R) 0.5mm

Blue (B) 0.7mm

White (W) 0.9mm

70

72 and 92

Extra Deep U Track



Detail of construction

Minimum 10mm cavity

Mineral wool insulationpushed into Cormet I Studframing, if required

Cormet I Stud

Cormet U Track

Wall cladding

Minimum 10mmcavity

Mineral woolinsulation, if required

Cormet U Track


Base detail

Application details

Structural support Lafarge wallboard, asrequired

System assembly

Framing

Set out the Cormet IndependentWall Lining system, allowing aminimum cavity width of 10mmbetween the external wall and theadjoining face of the dryliningsystem, taking into account thethickness of the insulation whichmay be greater than the width ofthe framing.

Fix Cormet U Track to the floor andthe structural soffit at 600mmcentres. If applying the floor trackdirect to new concrete, the concretemust be dry, and a damp proofingmembrane should be used. Onuneven floors a timber sole platemay be required.

Cut Cormet Studs 5mm shorter thanthe floor to soffit height to allowfor floor variations. Insert the studsinto the floor and head tracks andtwist to lock, positioning them at upto 600mm centres. Arrange theframing so that board widths of lessthan 300mm are avoided. UseCormet I Studs for the main run ofthe wall lining, with Cormet C Studsat abutments, openings and corners.

Vapour control layer (this can be LafargeVapourcheck wallboard)



2

51


Internal corner

Junction with partition

External cladding zone10mm minimumcavity

Cormet C Stud

Cormet I Stud

External claddingzone

10mm minimumcavity

Cormet I Stud tosupport partition

CormetInsulation Hold Strip

Insulation

Insert mineral wool insulation intothe framing within the flanges ofthe studs and the tracks. Whereinsulation is thicker than stud width,ensure insulation is installed as thediagram opposite. Ensure that theyare fully inserted into the framing,and that the cavity between thelining and the external wall ismaintained. Where insulation isthicker than the framing width, fitthe insulation with its exposed facelevel with the inner face of theframing, and so that the edges ofthe insulation is split by the flangesof the studs and tracks at the back.

Narrower batts and all quilts shouldbe suspended on Cormet InsulationHold Strips 150mm from top and at1200mm vertical centres down thelining.

Boarding

Cut plasterboard 5mm shorter thanthe floor-to-soffit height, butt firmlyagainst the ceiling and fix to theframing with Lafarge DrywallScrews. Align wallboards, leaving anominal 3mm gap between eachother and centre edges of theplasterboard over the studs.

If sound insulation is required, applya 6mm bead of Lafarge IntumescentAcoustic Sealant around theperimeter of the framing or theouter layer of wallboard.

For fixtures to linings see Section 8Sitework, table 8.3.

Application details




Application details

Window/doorframe

External cladding zone

10mm minimum cavity

Cormet C Stud Cormet I Stud


Cormet I Stud

Mineral woolinsulation, ifrequired

Cormet C Studs fixedtogether to supportcorners

Door or window reveal

Wall abutment

Lining around column

External cladding zone

10mm minimum cavity

Mineral wool insulation,if required

Mineral wool insulation,if required

Vapour control layer

Vapour controllayer

Lafargewallboard,as required

Vapour control layer

LafargeIntumescentAcoustic Sealant

Lafarge Intumescent Acoustic Sealant


2

53


Cormet Independent WallLining

Scope

Independent framing of Cormet IStuds, set away from the wall, linedwith Lafarge plasterboards withinsulation as required.

Additional clauses






NBS clauses





Location ........................

Client reference ........................

Performance

Maximum height ....................m



Thermal transmittance ....................W/m2K (dependent on background)


Horizontal jointsUse Cormet Fixing Strap FS50/R, FS90/W or Cormet Fixing Channel MFIX ifpartition height exceeds board height.


Acoustic mastic6mm bead of Lafarge Intumescent and Acoustic Sealant around perimeter ofthe framing.

StudsLafarge I studs, reference IS50/R, IS60/B, IS70/B or IS90/B at max 300, 400 or600mm centres.

Floor and head trackLafarge U Tracks, reference UT52/R, UT62/R, UT72/R, UT92/R or UT148/R fixedat max 600mm centres.

Lafarge U Track Deep, reference UDT52/B, UDT62/B, UDT72/B or UDT92/B orLafarge Extra Deep U Track, reference UXT72/B or UXT92/W fixed at max600mm centres. (Deep or Extra Deep U Tracks to be specified when lining isover 4.2m high)











Type Drywall Self-tapping, or Drywall Self-drilling, or Toughcheck Self-tapping,or Toughcheck Self-drilling, or Checkpoint Self-tapping, or Megadeco Self-tapping.






InstallationAll materials, unless otherwise indicated, shall be supplied by lafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Given the vast selection of different types of substrate that are encounteredon-site, it is strongly recommended that adequate site tests be carried out toestablish a recommended load on fixings.

Notes:





Step oneSet out the systeminside the wall; allow a minimum cavitywidth of 10mmbetween wall andback of metal framing,or to the insulation ifthickness of insulationis greater than widthof framing.

Fix Cormet U Trackto timber or concretefloor at 600mmcentres using suitablefixings.

Note: If applying Cormet U Track directly to newconcrete, the concrete must be dry and a damp-proofing membrane should be used. On unevenfloors a timber sole plate may be required. Wheresound insulation is critical, apply a bead of LafargeIntumescent Acoustic Sealant under the sole plate.

Note: If sound insulation is required, apply a 6mm beadof Lafarge Intumescent Acoustic Sealant around theperimeter of the framing or the outer layer ofwallboard.

Step twoInstall CormetC-Stud using a spiritlevel to plumb uprighton end wall, and fixat 600mm centresusing suitable fixings.

Step threeInstall ceiling CormetU Track onto endwall Cormet C Stud,using a Cormet I Stud(as a temporary prop)and a spirit level.Plumb opposite endof ceiling Cormet UTrack to align withfloor Cormet U Track.Screw-fix ceilingCormet U Track intoposition at 600mmcentres or less.

Step fiveUsing a disc cutter,drop-saw or anglegrinder, cut Cormet IStuds to length(5mm shorter thanthe floor to soffitheight) whilst they are in a pack. If ceiling or floor are very uneven, CormetI Studs should be cutseparately.

Step sixInsert the stud intothe floor and ceilingtracks and twist tolock. Position them at 300, 400 or 600mmcentres for 1200mmwide plasterboard.

Step sevenCut plasterboard 5mm shorter than thefloor-to-soffitheight, butt firmlyagainst the ceiling andfix to the framingwith Lafarge DrywallScrews at 300mmcentres.

Align wallboards,leaving a nominal3mm gap betweeneach other andcentre the edgesover the studs.

1

2

3

5

6

7

Note 1: Arrange the framing so that board widthsof less than 300mm are avoided. Use Cormet I Studs for the main run of the walllining, with Cormet C Studs at stop ends,abutments, junctions, openings and corners.

Note 2: Insulation and any services should beinstalled prior to boarding.


Installation

4Step fourFix opposite end ofCormet C Stud at600mm centresusing suitablefixings.


L I N I N G STIMBER FRAME

2

55

The popularity of timber framehousing calls for a fast, efficientlining solution. The use ofplasterboard in these propertiesprovides a ready means ofmeeting Building Regulationsrequirements in respect of sound,thermal and fire performance.These features have made drywallthe preferred choice for timberframe constructions in marketsranging from volume housebuildersin Scotland to the self-buildmarket countrywide.

Alternative fixing methods includenails, screws and the incorporationof Cormet Resilient Bar whichhelps compensate for anymovement in the timber overtime. The availability ofThermalcheck, Vapourcheck,Toughcheck, Firecheck anddBcheck boards, as well as theDeco system of colour-matchedproducts, allows ready selection ofthe correct specification for eachproject.



Drylining to timber framed wall

Minimum 50mm cavitybetween sheathing andexternal wall cladding

Lafarge Firecheck wallboardincorporating a vapour control layersecured to timber framing

Timberframing byothers, studsat maximum600mmcentres

Breather membraneto BS 4016

Insulation quilt

Sheathing board

Sole plate

Introduction



8

Finishes 7

Lafarge Drywall Linings:Timber FrameIn timber framed housing Lafargeplasterboard linings offer easy fixingto lightweight constructions.

The high strength and rigidity ofLafarge plasterboards make themsuitable for use in the assembly ofprefabricated panels which arebraced with sheathing ply or similar.Their use also contributes to theexcellent thermal and acousticperformance of timber framedsystems as well as providing fireprotection to the structure.

Performance

The selection of drylining system,insulation and boarding will dependon the wall height and theperformance required for fireresistance, thermal and soundinsulation: refer to performancetables 2.1 and 2.6.

Lafarge plasterboards are defined asClass 0 in accordance with theNational Building Regulations 1991Approved Document B1/2/3/4/5 (FireSafety) and Building Standards(Scotland) Regulations 1990,Regulation D2 when tested to BS 476: Part 6: 1989 and Part 7: 1987.


2

57


Application details

Lining to external wall

Zone of timberframe and thermalinsulation

Zone of externalfinishes:all voidsto be ventilated

Sheathing board

Breathermembrane toBS 4016

Lafarge wallboardwith vapourcontrol layer

Cormet InsulationHold Strip

Table 2.13 Timber frame componentsComponent Use

Lafarge Drywall High For fixing Resilient Bar and Lafarge

Thread Screws wallboards to timber

Lafarge Intumescent To seal air gaps at board perimeters

Acoustic Sealant

Lafarge wallboard with vapour Most Lafarge wallboards can be

control layer ordered with a vapour control layer,

specify Moisturecheck Vapourcheck

for humid areas such as bathrooms

Cormet Insulation Hold For securing mineral wool insulation

quilt in place between timber studs

Cormet Resilient Bars For improving the sound performance

and minimising the risk of joints

cracking due to timber movement

during the drying out of the timber

Components

The Lafarge components used in thelining of timber framed walls aredescribed in table 2.13.

System assembly

General construction

Typically, timber framed externalwalls have studs set out at 400mmor 600mm centres to maximiseeconomical use of the liningmaterials. The external sheathing tothe frame normally consists of 9mmstructural plywood or other wood-based sheet material, protectedfrom moisture by a breather paperto BS 4016: 1972. This serves tobrace the timber frame.

Use 12.5mm Lafarge wallboard witha vapour control layer. This preventsinterstitial condensation forming inthe wall cavity.

Insulation

In all systems where rock mineralwool or glass mineral woolinsulation is used, it should besupported using Cormet InsulationHold Strips 150mm below the wallhead and at 1200mm centres downthe height of the wall. This willprevent the insulation from saggingover time, with consequent loss ofthermal and acoustic performance.

Boarding

For internal linings, lightly buttplasterboard edges if a taped andjointed finish is required, leave a 2-3mm gap between the boards if a plaster finish is required. Fix theboards with Lafarge Drywall HighThread Screws at 300mm centres.Fixings should be no closer than10mm to the bound edges and13mm to the cut edges of theboards.

Internal partitions andseparating walls

Refer to Timber Stud Partitions inSection 3.

Cormet Resilient Bars

Where the Cormet Resilient Bar is tobe fixed to timber studs thefollowing centres apply:

• 400mm centres for single layerboarding

• 600mm centres for double layerboarding

Fix initial Cormet Resilient Bar50mm down from the ceiling, lastbar 50mm from floor.

For fixing Cormet Resilient Bar totimber studs use 38mm Lafarge HighThread Screws.

Screw fix the wallboard to theCormet Resilient Bar only, ensuringthe screw does not touch the metalsubstrate.

For screw lengths for fixingplasterboard to Cormet ResilientBars see Table 2.14.

Table 2.14 Recommended screwlengths for fixing plasterboardto Resilient Bars

Plasterboard thickness Screw length(mm) (mm)

12.5 25

15.0 25

19.0 32

12.5 + 12.5 38

19.0 + 12.5 44

15.0 + 15.0 44

Cormet Resilient Bar

RBD3000




Lafarge Linings to TimberFrame

Scope

For fixing plasterboard to structuraltimber framing which forms part ofan external wall, with insulationbetween the timber studs asrequired.

Additional clauses

Add general clauses if required for:

Expansion/movement joints

Health and safety

Storage of materials

Site conditions and workmanship.

NBS clauses



System reference (Insert Lafarge system reference from PerformanceTables)






Horizontal jointsUse Cormet Fixing Strap FS50/R, FS90/W or Cormet Fixing Channel MFIX, iflining exceeds the board height.


Acoustic mastic6mm bead of Lafarge Intumescent Acoustic Sealant around perimeter of theframing.

FramingTimber framing by others.

Cormet Resilient Bar RBD3000, if required.





Type, Drywall High Thread.

Length, inner layer (Select from 32, 38, 41, 51, 63, 76)mm

Length, outer layer (Select from 32, 38, 41, 51, 63, 76)mm

FinishingLafarge Taping and Jointing system, or




Notes:




2

59

L I N I N G SSTRUCTURAL STEEL FRAME

Steel frame housing calls for afast, efficient lining solution. Theuse of plasterboard in theseproperties provides a ready meansof meeting Building Regulationsrequirements in respect of sound,thermal and fire performance.These features have made drywallthe preferred choice for steelframe housing.



Introduction

Framed ConstructionsThe drywall principles in all framedconstructions are largely similar,with wallboard providing a non-structural finish to the framework.

Thermal Performance

In general the lighter framedconstruction heat up or cool downquicker than wet constructionsallowing greater heating flexibility.Framed constructions are easy toinsulate and often exceed currentBuilding Regulations.

Sound Insulation

A key factor in sound reductionbetween rooms is a change in pathof acoustic energy (plasterboard, air,insulation and plasterboard). Thebest performing partitions are metalstud with multi-layers of wallboardand mineral wool insulation withinthe cavity.

Cold formed steel

Building in steel has been popular inthe USA and South Africa for sometime and recently has been thesubject of much interest in the UKand Ireland. The steel frameworkworks in a similar way to timber, but introduces repeatability and agreater level of consistency to theconstruction process.

'Modular'

Often used for building fast foodoutlets, student accommodation,hotel rooms and bathroom 'pods'modular building is growing fastand in a number of cases has beenused for residential building. Thishas led to specific wallboardrequirements.

Hot rolled structural steel

Techniques used to build offices andmulti-storey buildings are also usedin building apartment blocks. Hotrolled I section steel with concreteand steel floors can be assembledquickly in areas where space is aconstraint. Build costs can besignificantly lowered through theuse of lightweight metal studpartitions. The benefits oflightweight construction are thatthey improve acoustic and fireperformance as well as speed ofinstallation.

Drylining to steel framed wall

Minimum 50mm cavitybreather membrane andexternal wall cladding

Inner layer of Lafarge Vapourcheckwallboard, outer layer of LafargeFirecheck wallboard

Structural steelframe byothers, studsat maximum600mmcentres

Breather membraneto BS 4016

Insulation quilt

Lafarge Thermalcheck Sheathing Board

Sole plate

LafargeThermalcheckSheathingBoard



2

61

Application details

Lining to external wall

Zone of steelframe and thermalinsulation

Zone of externalfinishes:all voidsto be ventilated

LafargeThermalcheckSheathing Board

Breathermembrane toBS 4016

LafargeVapourcheck andLafarge Firecheck

Table 2.15 Steel frame componentsComponent Use

Lafarge Self Drilling Screws For fixing Resilient Bar and Lafarge

wallboards to steel frame

Lafarge Intumescent To seal air gaps at board perimeters

Acoustic Sealant

Cormet Insulation Hold For securing mineral wool insulation

quilt in place between timber studs

Cormet Resilient Bars For improving the sound performance

and minimising the risk of joints

cracking due to timber movement

during the drying out of the timber

Lafarge wallboard with vapour Most Lafarge wallboards can be

control layer ordered with a vapour control layer,

specify Moisturecheck Vapourcheck

for humid areas such as bathrooms

Lafarge Thermalcheck To provide sheathing on the cold

Sheathing Board side of the steel frame

Lafarge Firecheck To provide a high level of fire

wallboard resistance to protect the steel frame

Components

The Lafarge components used in thelining of steel framed walls aredescribed in table 2.15.

System assembly

General construction

Typically, steel framed external wallshave studs set out at 400mm or600mm centres to maximiseeconomical use of the liningmaterials. The external sheathing tothe frame normally consists of25mm Lafarge ThermalcheckSheathing Board, protectedexternally by a breather membraneto BS 4016: 1972.

Internally, use 12.5mm LafargeVapourcheck and Lafarge Firecheckwallboards. The vapour control layerin Lafarge Vapourcheck preventsinterstitial condensation forming inthe wall cavity.

Insulation

In all systems where rock or glassmineral wool insulation is used, itshould be supported using CormetInsulation Hold Strips 150mm belowthe wall head and at 1200mmcentres down the height of the wall.This will prevent the insulation fromsagging over time, with consequentloss of thermal and acousticperformance.

Boarding

For internal linings, lightly buttplasterboard edges if a taped andjointed finish is required, leave a 2-3mm gap between the boards if a plaster finish is required. Fix theboards with Lafarge Self DrillingScrews at 300mm centres. Fixingsshould be no closer than 10mm tothe bound edges and 13mm to thecut edges of the boards.

Internal partitions andseparating walls

Refer to Cormet Metal StudPartitions and Cormet Twin Walls inSection 3.




Lafarge Linings toStructural Steel Frame

Scope

For fixing plasterboard to structuralsteel framing which forms part of anexternal wall, with insulationbetween the steel studs as required.

Additional clauses



Health and safety



NBS clauses



System reference (Insert Lafarge system reference from PerformanceTables)






Horizontal jointsUse Cormet Fixing Strap FS50/R, FS90/W or Cormet Fixing Channel MFIX, iflining exceeds the board height.



FramingSteel framing by others.

Boarding (internal)Single or double layer of wallboard.



Boarding (external)25mm Lafarge Thermal Sheathing Board.

Protected by breather membrane, type .................... by ....................

Board fixingsLafarge self drilling screws at 300mm centres

Type, Drywall Self Drilling.


Length, outer layer (Select from 25, 32, 38, 41, 44, 67)mm

FinishingLafarge Taping and Jointing system, or




Notes:




L I N I N G SCONTOUR LININGS

2

63

Slim, 6mm Lafarge Contour boardoffers an ideal, cost-effectivemeans of covering up old tiles inkitchens and bathrooms. Fixedwith drywall adhesive, installationtakes up a total depth of just8mm. This is a faster solution thanskim plastering for renovationprojects and, provided thesubstrate is sound, avoids theneed to remove tiled finishes priorto construction.



Introduction

Lafarge DrywallAdhesive (RDA5) dabs approx. 25x25mmat 300mm centres




8

Finishes 7

Table 2.16 Lafarge Contour componentsComponent Use Reference

Lafarge Drywall An Acrylic compound with fillers RDA5

Adhesive for fixing Lafarge Wallboard to

metal, ceramic tiles, timber, plaster,

plasterboard and suitably treated

sound backgrounds

Lafarge Contour X2

Wallboard

Lafarge Nailable NP60, NP80

Plugs NP110

Lafarge Contour LiningsLafarge Contour linings offer a fastand efficient method of liningunsightly walls and ceilings. It isespecially useful in renovation workwhere a drywall solution todistressed plasterwork or tiling isrequired.

Lafarge Contour wallboard is only6mm thick, so a modern flat surfacecan be achieved, whilst onlyincreasing wall thickness by 8mm.Because it is a system for resurfacingold walls it is not necessary toremove old mortar or plaster that isstill firmly attached. The lining canbe jointed 12 hours after application.

In addition, it is possible to upgradethe thermal performance of olderbuildings by using Drywall Adhesiveto fix Lafarge Thermalcheckwallboards.

Components

The components used in the LafargeContour lining system are listed intable 2.16.

Limitations

Lafarge Drywall Adhesive is a thinbed adhesive and should not beused more than 2mm thick.


2

65


Application details

1200

600 25

1200

800

800

Nailable Plug fixing arrangementSystem assembly

Lafarge Contour wallboard can befixed to most flat and levelbackgrounds by direct bonding withLafarge Drywall Adhesive. The onlypreparation required is to provide amechanical key for the adhesive.Loose plaster and wallpaper must beremoved. Ceramic tiles must beclean and free from contamination.

If background is excessively dusty orof a high suction, seal with a PVACbonding agent, applied inaccordance with manufacturer’sinstructions.

Ensure that the background has noprotruding high points which mayperforate the plasterboard.


Apply thin dabs of Lafarge DrywallAdhesive to the background at300mm centres. Dabs should beapproximately 25mm x 25mm andabout 25mm in from the boardedges.

Boarding

Start boarding from an internalangle. Press the grey face of theplasterboard firmly against the dabs,checking that it is true and vertical.Fit the board tight against theceiling and temporarily wedge thebottom edge in position and leave itto set.

Drill five 6mm diameter holesthrough the plasterboard and intothe masonry, as shown. Insert 60mmLafarge Nailable Plugs and carefullydrive them just below theplasterboard surface.

Jointing

Allow twelve hours for the LafargeDrywall Adhesive to set beforejointing.

All joints should be taped and filledin accordance with LafargePlasterboard’s instructions.




Lafarge Contour Linings

Scope

The direct bonding of LafargeContour wallboard to masonry onconcrete, sound plaster and glazedtile backgrounds using LafargeDrywall Adhesive.

Exclusions

The specification shall not be usedwhere backgrounds are subject todamp and where the background ismore than 2mm out of level.

Additional clauses



Health and safety



NBS clauses




Design thickness 8mm max.


Adhesive applicationApply Lafarge Drywall Adhesive in 25mm daubs at 300mm horizontal andvertical centres. Finished daub thickness is 2mm

BoardingSingle layer of Lafarge Contour wallboard.

Secondary mechanical fixing5 No Lafarge Nailable Plugs, length 60mm, shall be installed in accordancewith Lafarge Plasterboard’s instructions.





Notes:




L I N I N G SWHAT CAN GO WRONG CHECKLIST

2

67

Lining Solutions

Items to check

1. Are the dabs for the wallboard lining continuous at the wall perimeter?This helps to seal airpaths behind the wallboard.

2. Are there continuous dabs of plaster around socket outlets?

This helps to seal airpaths behind the wallboard.

3. Is the gap at the base of the wallboard filled with Lafarge IntumescentAcoustic Sealant?

If left unfilled, this will be a weak point for air to pass through.

4. Is the thermal lining the correct insulation type and thickness?

The different types of insulation vary significantly in performance. Installing thewrong type and thickness could seriously increase heat loss.

5. Are there mechanical fixings securing the Lafarge Thermalcheckwallboards in place?

The boards may detach from their background if the fixings are omitted

6. Where mineral wool is installed between studs, is it the correct thickness?

7. Where mineral wool is installed between studs, is it free from gaps?

Yes No Date completed

(✓) (✓)


L I N I N G S

Case study

PARTITIONS 3

70

P A R T I T I O N SINTRODUCTION


Contents

Performance Tables 71

Cormet Twin Frame Systems 99

Cormet Resilient Bar Systems 107

Cormet Acoustic Stud Systems 113

Cormet C Stud Systems 123

Timber Stud Systems 133

Masonry Systems 139

Specialist Junctions and Installations 141


Cormet Twin Frame Systems

Cormet Twin Frame Systems offer anumber of advantages over heavymasonry construction. They arelightweight, quick to construct, cost-effective, compact and offerhigh levels of fire resistance andacoustic insulation.

Cormet Resilient Bar Systems

Use of Cormet Resilient Barimproves the acoustic performanceof partitions with little increase inwidth or weight. Cormet ResilientBars are fixed to one side of the studpartition prior to facing withwallboard.

Cormet Acoustic Stud Systems

The Cormet Acoustic HomespanPartition System uses sound absorbingC studs to achieve a 40 Rw dB soundrating, without insulation, in a75mm wide partition.

Cormet Omega Acoustic Stud hasbeen specially designed to givegreater sound insulation performancein the key frequency bands between250 Hz and 1,000 Hz. Used inconjunction with Cormet U Trackand accessories, Omega AcousticStud is particularly effective atreducing common daily noise suchas sound generated by stereos andother audio-visual equipment.

Cormet C Stud Systems

Cormet C Stud Systems allowguaranteed performance to beachieved across a broad range ofdomestic, commercial and industrialapplications. These systems providea cost-effective, versatile approachto the assembly of non-loadbearingpartitions.

Timber Stud Systems

Timber stud partitions are suitablefor limited heights and mainly usedin domestic installations. They areable to achieve high levels of fireresistance and sound insulation.

Masonry Systems

Traditional masonry constructionsremain the most popular form ofconstruction, accounting forapproximately 70% of all new builddwellings. Where such materials areused, drywall systems still have a keyrole to play in providing acoustic/thermal performance and finishingsolutions. A case in point is the Cormet Dryliner system whichoffers the developer quickercompletion by reducing reliance on wet trades and associated drying out times.

Specialist Junctions andInstallations

Creating special design features isgreatly simplified using Lafargedrywall systems which can bespecified - among others - fordeflection head details, junctions toconcrete, timber and floating floorconstructions, baffles, service andduct penetrations, dampers, doorframe details, boxed studs, columnencasements, movement joints, andcurved partitions. A range of fixingsis also available to accommodatedifferent fixtures and loadings.

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

71

Performance tables

RMP 003

RMP 004

RMP 001 Studs: 70mm Cormet C Stud (CS70/R) at600mm centres

Facings: one layer 15mm LafargeMegadeco wallboard both sides

Studs: CS70Rx at 600mm centres


Insulation: 25mm glass mineral wooldensity 16 kg/m3

Studs: 70mm Cormet C Stud (CS70/R) at600mm centres



27 3.8 100 60 60 Severe 40

27 3.8 100 60 60 Severe 49

27 3.8 100 60 60 Severe 50

System reference

RMP 050 Studs: CS70Rx at 600mm centres

Facings: inner layer 9.5mm LafargeStandard wallboard, outer layer 15 mmLafarge Megadeco wallboard both sides

Insulation: 25mm superglass partition mat(19 kg/m3) or equivalent

40 4.6 120 60 60 Severe 56

Specification

Table 3.1Cormet Megadeco Partitions, non-loadbearing

3

AMP 003 Studs: AS70Rx at 600mm centres

Facings: one layer 15 mm LafargeMegadeco wallboard both sides


27 3.8 100 60 60 Severe 51

RMP 009 Studs: CS70Rx at 600 mm centres

Facings: inner layer 12.5mm LafargeFirecheck, outer layer 12.5 mm LafargeMegadeco both sides

43 4.6 120 120 120 Severe 52

43 4.6 120 120 120 Severe 56Studs: 70mm Cormet C Stud (CS70/R) at600mm centres

Facings: inner layer 12.5mm LafargeFirecheck or Megadeco wallboard, outerlayer 12.5mm Lafarge Megadeco wallboardboth sides


RMP 011

With studs at 400mm centres, maximum height H can be increased by 0.3m for single layer boarding and 0.6m for double layer boarding.

The maximum partition heights are based on the verification of the Serviceability Limit State (SLS) and the Ultimate Limit State (ULS) as defined inBS EN 1993-1-1 (Eurocode 3).

All maximum heights based on a maximum partition deflection of H/240 under a uniform pressure of 200 Pa.

The maximum heights of the partitions may vary if the fire resistance of the system is specified according to the EN 1364-1:1999. Performances values are forimperforate, jointed systems using Lafarge components (metal studs & tracks, boards, metal accessories, screws and finishing systems) and specified quiltmaterials (type, thickness and density) installed to the Lafarge specification. Any alterations may impair the quoted performance criteria.When skim plastering is required, the GTEC Megadeco boards shall be substituted by the GTEC Universal board to obtain the quoted performances.

Thicker and heavier quilt material can be used without impairing the quoted performances. Rock mineral wool density 40kg/m3 may be used in lieu of the glassmineral wool.

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)



27 4.6 120 60 60 Severe 42

72

P A R T I T I O N S


Performance tables


RMP 128 Studs: CS90Rx at 600mm centres



27 4.6 120 60 60 Severe 50

RMP 138


Facings: inner layer 12.5mm LafargedBcheck wallboard, outer layer 12.5mmLafarge Megadeco wallboard both sides





45 5.8 140 90 90 Severe 57

27 4.6 120 60 60 Severe 51


Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Megadeco wallboard both sides


53 6.5 150 90 90 Severe 58

AMP 141 Studs: 90mm wide Omega Acoustic Stud(AS90/R) at 600mm centres

Facings: inside layer 15mm LafargedBcheck wallboard between studs, outerlayer 15mm Lafarge Firecheck wallboard orMegadeco wallboard both sides


40 4.6 120 60 60 Severe 54






Table 3.1 (ctd)Cormet Megadeco Partitions, non-loadbearing

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)Table 3.1 (ctd)

Cormet Megadeco Partitions, non-loadbearing



P A R T I T I O N S

73

Performance tables


Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard both sides


53 6.5 150 90 90 Severe 60




27 4.4 120 60 60 Severe 52

RMP 062

RMP 075

Studs: 146mm Cormet C Stud (CS146/Y) at600mm centres





29 8.8 176 60 60 Severe 42

28 7.3 176 60 60 Severe 52

RMP 038 Studs: two 50mm Cormet C Stud (CS50/R)at 600mm centres, braced horizontallywith Cormet V Brace at max. 1.5m centres

Facings: inner layer 15mm LafargedBcheck wallboard, outer layer 15mmLafarge Megadeco wallboard both sides


55 5.3 200 120 90 Severe 63

-7 Ctr

3






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

74

P A R T I T I O N S


Performance tables

RRP 055

RRP 052

RRP 049 Studs: 70mm Cormet C Stud (CS70/B)* at600mm centres

Facings: one layer 12.5mm LafargeToughcheck wallboard both sides

Studs: 70mm Cormet C Stud (CS70/B)* at600mm centres

Facings: one layer 12.5mm LafargeToughcheck wallboard both sides

Insulation: 25mm glass mineral woolinsulation density 16 kg/m3

Studs: 70mm Cormet C Stud (CS70/B)* at600mm centres

Facings: two layers 12.5mm LafargeToughcheck wallboard both sides

Table 3.2Cormet Toughcheck Partitions, non-loadbearing

23 4.4 95 60 30 Heavy 39

23 4.4 95 60 30 Heavy 47

45 5.5 120 120 120 Severe 52

System reference

RRP 053

RRP 048 Studs: 70mm Cormet C Stud (CS70/B)* at600mm centres



Studs: 146mm Cormet C Stud (CS146/B)*at 600mm centres


45 5.5 120 120 120 Severe 55

46 8.6 196 120 120 Severe 54

Specification

RRP 054 Studs: 146mm Cormet C Stud (CS146/B)*at 600mm centres


Insulation: 25mm glass mineral wooldensity min. 16 kg/m3

47 8.6 196 120 120 Severe 58

* B gauge metal studs (0.70 mm thickness) shall be used for all the systems show in this table 3.2






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

75

Performance tables

RSP 002

RSP 003

RSP 001 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres

Facings: one layer 15mm Lafarge dBcheckwallboard both sides


Facings: one layer 12.5mm LafargedBcheck wallboard both sides



Facings: two layers 12.5mm LafargedBcheck wallboard both sides

Table 3.3Cormet dBcheck Partitions, non-loadbearing

27 3.4 80 30 30 Heavy 40

23 3.5 75 30 30 Medium 44

45 3.6 100 60 60 Severe 45

System reference

RSP 027


Facings: two layers 15mm LafargedBcheck wallboard both sides




53 4.0 110 90 60 Severe 46

45 3.6 100 60 60 Severe 53



23 4.5 95 30 30 Medium 40

Specification

3









23 4.5 95 30 30 Medium 45

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

76

P A R T I T I O N S


Performance tables



27 4.4 100 30 30 Heavy 42

System reference

RSP 011







27 4.4 100 30 30 High 46

45 4.6 120 60 60 Severe 54




53 5.1 130 90 90 Severe 56

ASP 006 Studs: 70mm wide Omega Acoustic Stud(AS70/R) at 600mm centres


23 4.5 95 30 30 Medium 42

Table 3.3 (ctd)Cormet dBcheck Partitions, non-loadbearing

Specification




45 4.6 120 60 60 Severe 58






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

77

Performance tables

System reference


Specification

RSP 017







53 5.1 130 90 60 Severe 59

54 8.9 206 90 90 Severe 57






3

RSP 038

RSP 022

RSP 021 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, braced horizontallywith Cormet V Brace at max. 1.5m centres

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, outerlayer 12.5mm dBcheck wallboard bothsides


Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, braced horizontallywith Cormet V Brace at max. 1.5m centres



Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, braced at every 3m withCormet V Brace and Cormet PrimaryChannel MFCP44 extension



52 4.9 200 90 60 Severe 64

-10 Ctr

55 5.3 200 90 90 Severe 63

-7 Ctr

52 10.2 295 60 60 Severe 67

-9 Ctr

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

78

P A R T I T I O N S


Performance tables

System reference


Specification

RSP 033 Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, in UT92/W tracks set122mm apart. Braced at 3m centres withCormet V Brace and Cormet PrimaryChannel MFCP44 extension

Facings: inner layer 19mm Lafarge Plank,middle and outer layers 15mm LafargedBcheck wallboard both sides

Insulation: two 150mm glass mineralwool quilts density 10 kg/m3

87 12* 400 120 90 Severe 73

-7 Ctr

Studs: two 90mm Cormet C Studs(CS90/W) at 600mm centres, in UT92/Wtracks set 125mm apart. Braced at 3mcentres with Cormet V Brace and CormetPrimary Channel MFCP44 extension

Facings: three layers of 15mm LafargedBcheck wallboard both sides


RSP 037 86 12* 400 120 90 Severe 74

-7 Ctr






RSP 023 Studs: two 90mm Cormet C Studs(CS90/W) at 600mm centres, braced atevery 3m with Cormet V Brace and CormetPrimary Channel MFCP44 extension



60 10.5 300 90 60 Severe 69

-9 Ctr

RSP 025 Studs: two 90mm Cormet C Studs (CS90/W)at 600mm centres, braced at every 3m withCormet V Brace and Cormet PrimaryChannel MFCP44 extension

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, middleand outer layers 12.5mm Lafarge dBcheckwallboard both sides


79 12* 400 90 90 Severe 72

-7 Ctr

* For larger height requirements please contact Technical Enquiyline.

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

79

Performance tables








Studs: 90mm wide Cormet C Stud (CS90/R)at 600mm centres

Facings: two layers 15mm LafargedBcheck wallboard both sides and withCormet Resilient Bar (RBD3000) to oneside at 600mm vertical centres


RSP 158 53 4.5 167 90 90 Severe 62

-9 Ctr




RSP 159 54 7.2 223 90 90 Severe 63

-8 Ctr

Studs: 70mm wide Cormet C Stud (CS70/R)at 600mm centres



RSP 157 53 3.7 147 90 90 Severe 62

-9 Ctr

Studs: 60mm wide Cormet I Studs (IS60/B)at 300mm centres, staggered in 72mmtrack with ISC10 clips



RSP 019 56 5.3 130 60 60 Severe 58

Studs: 60mm wide Cormet I Studs (IS60/B)at 300mm centres, staggered in 72mmtrack with ISC10 clips



RSP 085 56 5.3 130 60 60 Severe 59

3

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

80

P A R T I T I O N S


Performance tables

RFP 016

RFP 013

RFP 010 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres

Facings: two layers 12.5mm LafargeFirecheck wallboard both sides





Facings: one layer 15mm LafargeFirecheck wallboard both sides


Table 3.4Cormet Firecheck Partitions, non-loadbearing – 50mm C Studs

42 3.6 100 120 120 Severe 45

42 3.6 100 120 120 Severe 52

25 3.1 80 60 30 Heavy 44


RFP 112

RFP 111 Studs: two 50mm Cormet C Stud (CS50/R)at 600mm centres set 45mm apart

Facings: inner layer 15mm LafargeFirecheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard

Core: three layers 15mm Lafarge Firecheckwallboard

Studs: two 50mm Cormet C Stud (CS50/R)at 600mm centres set 45mm apart

Facings: inner layer 15mm LafargeFirecheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecowallboard

Insulation: 25mm glass mineral wool quiltin each cavity density 16 kg/m3

Core: three layers 15mm Lafarge Firecheckwallboard

86 6.0 205 240 240 Severe 60

-10 Ctr

88 6.0 205 240 240 Severe 65

-10 Ctr






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

81

Performance tables

RFP 045

RFP 046


Facings: two layers 15mm LafargeFirecheck wallboard both sides

Studs: 70mm Cormet C Stud (CS70/R)600mm centres



50 4.9 130 120 120 Severe 50

50 4.9 130 120 120 Severe 57

System reference

RFP 050


Facings: one layer 12.5mm LafargeFirecheck wallboard both sides





21 4.3 95 60 30 Medium 45

42 4.6 120 120 120 Severe 53



26 4.0 100 60 60 Heavy 39




26 4.0 100 60 60 Heavy 47

Table 3.4 (ctd)Cormet Firecheck Partitions, non-loadbearing– 70mm C Studs

Specification






3

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

82

P A R T I T I O N S


Performance tables

RFP 157

RFP 125




Facings: inner layer 15mm LafargeFirecheck wallboard, outer layer 15mmLafarge Firecheck wallboard or Megadecoand with Cormet Resilient Bar (RBD3000)to one side at 600mm vertical centres



Facings: one layer 12.5mm LafargeFirecheck wallboard both sides


42 4.6 120 120 120 Severe 48

50 3.3 147 120 120 Severe 61

-7 Ctr

22 5.1 115 60 30 Medium 45

System reference

RFP 128


Facings: one layer 15mm LafargeFirecheck wallboard on both sides


Facings: one layer 15mm LafargeFirecheck wallboard on both sides


26 5.1 120 60 60 Heavy 40

26 5.1 120 60 60 Heavy 47

Table 3.4 (ctd)Cormet Firecheck Partitions , non-loadbearing– 90mm C Studs

Specification


Facings: inner layer 12.5mm LafargeFirecheck wallboard, outer layer 12.5mmLafarge Firecheck wallboard on both sides

42 5.3 140 120 120 Severe 49











Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

83

Performance tables

RFP 135

RFP 062


Facings: inner layer 12.5mm LafargeFirecheck wallboard, outer layer 12.5mmLafarge Firecheck wallboard on both sides




42 5.3 140 120 120 Severe 54

26 6.6 176 60 60 Heavy 42

System reference

RFP 068







26 6.6 176 60 60 Heavy 48

51 8.0 206 120 120 Severe 57



42 8.0 196 120 120 Severe 50




42 8.0 196 120 120 Severe 56

Table 3.4 (ctd)Cormet Firecheck Partitions, non-loadbearing– 146mm C Studs

Specification

3

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

84

P A R T I T I O N S


Performance tables

REP 002

REP 005

REP 001 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres

Facings: one layer 12.5mm Lafarge Echeckwallboard both sides





Facings: two layers 12.5mm LafargeEcheck wallboard both sides

Table 3.5Cormet Echeck Partitions, non-loadbearing

21 3.3 75 30 30 Medium 36

21 3.3 75 30 30 Medium 40

41 3.4 100 60 60 Severe 43

System reference

REP 041






41 3.4 100 60 60 Severe 49

21 4.3 95 30 30 Medium 36




21 4.3 95 30 30 Medium 42

Specification






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

85

Performance tables

REP 045

REP 046






41 4.6 120 60 60 Severe 46

41 4.6 120 60 60 Severe 50

System reference

REP 067





Insulation: 25mm glass mineral wooldensity 16k g/m3

42 8.0 196 60 60 Severe 48

41 8.0 196 60 60 Severe 52


Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally to studside and long edges vertically to resilientbar side. Outer layer 12.5mm LafargeEcheck wallboard. Cormet Resilient Bar(RBD3000) fixed to one side at 600mmvertical centres


49 3.6 150 60 60 Severe 63

-9 Ctr

Table 3.5 (ctd)Cormet Echeck Partitions, non-loadbearing

Specification






3

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

86

P A R T I T I O N S


Performance tables

REP 091 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedhorizontally with Cormet V Brace at max.1.5m centres



43 4.8 195 60 60 Severe 54

REP 094

REP 093 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedhorizontally with Cormet V Brace at max.1.5m centres

Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, outerlayer 12.5mm Lafarge Echeck wallboardboth sides


Studs: two 70mm Cormet C Studs (CS70/R)at 600mm centres, set 40mm apart, bracedhorizontally with Cormet V Brace at max.1.5m centres



50 4.7 200 90 60 Severe 60

-11 Ctr

42 5.4 230 60 60 Severe 55

Table 3.5 (ctd)Cormet Echeck Partitions, non-loadbearing







Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

87

3

Performance tables

RCP 002

RCP 005

RCP 001 Studs: 50mm Cormet C Stud (CS50/R) at600mm centres

Facings: one layer 12.5mm LafargeStandard or Predeco wallboard both sides





Facings: two layers 12.5mm LafargeStandard or Predeco wallboard both sides

Table 3.6Cormet Standard Wallboard Partitions, non-loadbearing

17 3.2 75 30 30 Medium 34

17 3.2 75 30 30 Medium 41

34 3.4 100 60 30 Severe 43

System reference




34 3.4 100 60 30 Severe 49

RCP 042



Studs: 70mm Cormet C Stud (CS70/R) at600 mm centres



17 4.2 95 30 30 Medium 36

17 4.2 95 30 30 Medium 42

Specification






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

88

P A R T I T I O N S


Performance tables

Table 3.6 (ctd)Cormet Standard Wallboard Partitions, non-loadbearing

System reference



34 4.6 120 60 30 Severe 46

RCP 155

RCP 064




Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally to studside and long edges vertically to resilientbar side. Outer layer 12.5mm LafargeStandard or Predeco wallboard. CormetResilient Bar (RBD3000) fixed to one sideat 600mm vertical centres




18 4.9 115 30 30 Medium 38

46 3.5 150 90 60 Severe 63

-10 Ctr

34 7.6 196 60 30 Severe 48

Specification




34 7.6 196 60 30 Severe 52









34 4.6 120 60 60 Severe 49

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)Table 3.6 (ctd)

Cormet Standard Wallboard Partitions, non-loadbearing


P A R T I T I O N S

89

Performance tables

RCP 091 Studs: two 50mm Cormet C Studs (CS50/R)at 600mm centres, set 40mm apart, bracedat max 1.5m centres with Cormet V Brace



36 4.2 190 60 60 Severe 54




35 6.4 230 60 60 Severe 55


Facings: inner layer 19mm Lafarge Plankfixed with long edges horizontally, outerlayer 12.5mm Lafarge Standard or Predecowallboard both sides


47 4.9 205 60 60 Severe 60

-11 Ctr


Facings: inner layer 15mm LafargeStandard wallboard, outer layer 15mmLafarge Standard or Predeco wall boardboth sides


42 8.2 206 90 60 Severe 53







3

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

90

P A R T I T I O N S


Performance tables

AHSP 002

AHSP 003

AHSP 001 Studs: 44mm Acoustic Homespan C Stud(AHS44/R) at 450mm centres

Facings: one layer 15mm Lafarge AcousticHomespan wallboard both sides

Studs: 44mm Acoustic Homespan C Stud(AHS44/R) at 450mm centres



Studs: 50mm Acoustic Homespan C Stud(AHS50/R) at 450mm centres


Table 3.7Cormet Acoustic Homespan Partitions,non-loadbearing

26 2.7 74 30 30 Heavy 40

26 2.7 74 30 30 Heavy 43

26 2.8 80 30 30 Heavy 41

System reference

AHSP 004 Studs: 50mm Acoustic Homespan C Stud(AHS50/R) at 450mm centres

Facings: one layer 15mm Lafarge AcousticHomespan wall board both sides


26 2.8 80 30 30 Heavy 43

Specification






Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

91

Performance tables

Table 3.8Cormet Omega Acoustic Stud Partitions, non-loadbearing


ASP 006 Studs: 70mm Omega Acoustic Stud(AS70/R) at 600mm centres


23 4.5 95 30 30 Medium 42






3




45 4.6 120 60 60 Severe 58




53 5.1 130 90 90 Severe 59

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Thic

knes

s, m

mFir

e Pe

rform

ance

BS4

76-p

art2

2:19

87

(non

load

bea

ring)

, min

utes

Fire

Perfo

rman

ce B

S476

-par

t21:

1987

(load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1364

-1:1

999

(non

load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1365

-

1:19

99 (

load

bea

ring

), m

inut

es

92

P A R T I T I O N S


Performance tables

ETP 003

ETP 001 Studs: 38 x 63mm at 600mm centres


Studs: 38 x 63mm at 600mm centres



21 3.0 88 30 30 n/a n/a Medium 36

21 3.0 88 30 30 n/a n/a Medium 40

ETP 004


Facings: two layers 12.5mm LafargeEcheck wallboard to both sides

Studs: 47 x 75mm at 600mm centres

Facings: two layers 12.5mm LafargeEcheck wallboard to both sides


42 3.0 125 60 30 n/a n/a Severe 45

42 3.0 125 60 30 n/a n/a Severe 48


Facings: one layer 12.5mm Lafarge Echeckto both sides

22 3.9 113 30 30 30 30 Medium 36

RTP 152 Studs: 38 x 89mm at 600mm centres

Facings: two layers 15mm LafargedBcheck wallboard one side, other sidetwo layers 15mm Lafarge dBcheckwallboard fixed to Cormet Resilient Bar(RBD3000) at 600mm vertical centres


54 3.6 166 60 60 60 60 Severe 57

Table 3.9Lafarge Drywall Timber Stud Partitions




All maximum heights are based on a maximum partition deflection of H/240 under a uniform pressure of 200 Pa.

Performances values are for imperforate, jointed systems using Lafarge components (metal studs & tracks, boards, metal accessories, screws and finishing systems)and specified quilt materials (type, thickness and density) installed to the Lafarge specification. Any alterations may impair the quoted performance criteria.


For allowable loads on stud please contact Technical Enquiryline.

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Thic

knes

s, m

mFir

e Pe

rform

ance

BS4

76-p

art2

2:19

87

(non

load

bea

ring)

, min

utes

Fire

Perfo

rman

ce B

S476

-par

t21:

1987

(load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1364

-1:1

999

(non

load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1365

-

1:19

99 (

load

bea

ring

), m

inut

es

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

93

3

Performance tables

Table 3.9 (ctd)Lafarge Drywall Timber Stud Partitions









Facings: one layer 12.5mm LafargeFirecheck to both sides

21 3.0 88 30 30 n/a n/a Medium 36


Facings: one layer 12.5mm LafargeStandard wallboard both sides

18 3.0 88 30 0 n/a n/a Medium 35




18 3.0 88 30 0 n/a n/a Medium 39


Facings: two layers 12.5mm LafargeStandard wallboard both sides

35 3.0 125 60 30 n/a n/a Severe 43




35 3.0 125 60 30 n/a n/a Severe 46

For larger height requirements please contact Technical Enquiryline.

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Thic

knes

s, m

mFir

e Pe

rform

ance

BS4

76-p

art2

2:19

87

(non

load

bea

ring)

, min

utes

Fire

Perfo

rman

ce B

S476

-par

t21:

1987

(load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1364

-1:1

999

(non

load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1365

-

1:19

99 (

load

bea

ring

), m

inut

es

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

94

P A R T I T I O N S


Performance tables

Table 3.9 (ctd)Lafarge Drywall Timber Stud Partitions










19 3.9 114 30 30 30 0 Medium 35




34 2.8 113 60 30 n/a n/a Severe 46


Facings: two layers 12.5mm LafargeStandard wallboard on both sides

34 2.8 113 60 30 n/a n/a Severe 42


Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Thic

knes

s, m

mFir

e Pe

rform

ance

BS4

76-p

art2

2:19

87

(non

load

bea

ring)

, min

utes

Fire

Perfo

rman

ce B

S476

-par

t21:

1987

(load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1364

-1:1

999

(non

load

bea

ring)

, min

utes

Fire

Per

form

ance

EN

1365

-

1:19

99 (

load

bea

ring

), m

inut

es

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

95

Performance tables

RFL 050*

RFL 011* Studs: pairs of studs 38 x 89mm at 600mmcentres forming two separate frames set50mm apart, braced at mid-height

Facings: both sides: inner layer 19mmLafarge Plank with long edges horizontal,outer layer 12.5mm Lafarge Firecheckwallboard

Insulation: 2 x 50mm glass mineral wooldensity 16 kg/m3

Studs: pairs of studs 38 x 89mm at 600mmcentres forming two separate frames set50mm apart, braced at mid-height

Facings: both sides two layers 15mmLafarge Firecheck wallboard with longedges horizontal

Insulation: 2 x 50mm glass mineral wooldensity 16 kg/m3

Table 3.10Lafarge Drywall Timber Stud PartitionHigh Performance, loadbearing

52 5.8 295 60 60 60 60 Severe 65

-12 Ctr

53 5.7 290 60 60 60 60 Severe 66

-9 Ctr





The maximum heights of the partitions may vary if the fire resistance of the system is specified according to the EN 1364-1:1999 and EN 1365-1:1999.Performances values are for imperforate, jointed systems using Lafarge components (metal studs & tracks, boards, metal accessories, screws and finishing systems)and specified quilt materials (type, thickness and density) installed to the Lafarge specification. Any alterations may impair the quoted performance criteria.



3


* Satisfies the robust detail criteria.

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

96

P A R T I T I O N S


Performance tables


Table 3.11Robust Detail Masonry Systems

E-WM-1(Robust Detail)

Blocks: double leaf 100mm dense aggregateconcrete density 1850-2300 kg/m3, 75mmcavity, tied with ‘Tie type A’ (as Approved Document E)

Finish: 13mm plaster or cement:sand renderwith plaster skim (min 10 kg/m2) both sides

N/A 5.2 315 240 240 N/A RD


Blocks: double leaf 100mm lightweightaggregate concrete density 1350-1600 kg/m3,75mm cavity, tied with ‘Tie type A’ (as Approved Document E)

Finish: 13mm plaster or cement:sand renderwith plaster skim (min 10 kg/m2) both sides

N/A 5.2 315 240 240 N/A RD


Blocks: double leaf 100mm dense aggregateconcrete density 1850-2300 kg/m3, 75mmcavity, tied with ‘Tie type A’ (as Approved Document E)

Render: 8mm cement:sand render

Lining: one layer 12.5mm gypsum basedboard (nominal 8 kg/m2) on dabs

N/A 5.2 315 240 240 N/A RD


Blocks: double leaf 100mm lightweightaggregate concrete density 1350-1600 kg/m3,75mm cavity, tied with ‘Tie type A’ (as Approved Document E)



N/A 5.2 315 240 240 N/A RD


Blocks: double leaf 100mm cellular Besblock‘Star Performer’ dense aggregate: coreconcrete density 1995 kg/m3, block concrete density 1528kg/m3, 75mm cavity, tied with ‘Tie type A’ (asApproved Document E)



N/A 5.2 315 240 240 N/A RD


Blocks: double leaf Aircrete concrete density 600-800 kg/m3, 75mm cavity, tied with ‘Tietype A’ (as Approved Document E)



N/A 5.2 315 240 240 N/A RD

Max

Hei

ght,

m

Wei

ght

(kg/

m2 )

Nom

inal

thi

ckne

ss, m

mFi

re P

erfo

rman

ce

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

1:19

99,

min

utes

BS 5

234-

2:19

92, S

tren

gth

duty

rat

ing

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)


P A R T I T I O N S

97

Performance tables


Table 3.12Separating Walls – Structural Steel Systems

Maximum height are for guidance only. Please refer to structural engineer for maximal heights determination.

Performances values are for imperforate, jointed systems using Lafarge components (metal studs & tracks, boards, metal accessories, screws and finishingsystems) and specified quilt materials (type, thickness and density) installed to the Lafarge specification. Any alterations may impair the quoted performancecriteria.


3

RLP 01 Studs: two 70mm structural steel studs at600mm centres, by other manufacturers

Facings: two layers each side - inner layer15mm Lafarge Standard wallboard, outerlayer 15mm Lafarge Firecheck wallboard

Insulation: 50mm glass mineral wool density24 kg/m3

N/A 3.6 250 60 60 Severe 65

-7Ctr

RLP 03* Studs: two 100mm structural steel studs at600mm centres, by other manufacturers

Facings: two layers each side - 15mmLafarge dBcheck wallboard

Insulation: two layers 75mm glass mineralwool density 24 kg/m3 in each stud cavity

N/A 4 310 90 60 Severe 66

-9 Ctr

RLP 14 Studs: 150mm structural steel studs at600mm centres, by other manufacturersFacings: two layers each side - inner layer15mm Lafarge dBcheck wallboard, outer layer15mm Lafarge Firecheck wallboard, andCormet Resilient Bar (RBD3000) at 600mmvertical centresInsulation: 50mm glass mineral wool density24 kg/m3 between studs

N/A 4.5 245 60 60 Severe 61

-7 Ctr

E-WS-1(Robust Detail)

Studs: two 100mm structural steel studs at600mm centres, by other manufacturersFacings: two layers each side - inner layer15mm Lafarge dBcheck wallboard, outer layer12.5mm Lafarge dBcheck wallboard (givestotal minimum weight 22 kg/m2 each side)Insulation: one layer 50mm glass mineralwool density 24 kg/m3 between studs.Alternatively, use 2 layers glass mineral woolquilt density 10 kg/m3, minimum 25mm thickper layer

N/A 4.5 310 60 60 Severe RD

E-WS-1: Alternative(Robust Detail)

Studs: two 100mm structural steel studs at600mm centres, by other manufacturersFacings: two layers each side - inner layer19mm Lafarge Plank with long edgeshorizontal, outer layer 12.5mm LafargeFirecheck wallboard (gives total minimumweight 22 kg/m2 each side)Insulation: one layer 50mm glass mineralwool density 24 kg/m3 between studs.Alternatively, use 2 layers glass mineral woolquilt density 10 kg/m3, minimum 25mm thickper layer

N/A 4.5 315 60 60 Severe RD

* Satisfies the robust detail criteria.

98

P A R T I T I O N S


Case study

Cormet Twin Wall Partitions aredesigned for installations requiringenhanced fire, sound or impactresistance and for use in creatingexceptionally wide or high partitions.

Ideal for fast-track projects, they offermarkedly better sound performance/thickness ratios than can be achievedusing blockwork.

This has made them popular forbuildings ranging from manufacturingfacilities, multiplex cinemas and multi-occupancy domestic properties tohospitals.


P A R T I T I O N SCORMET TWIN FRAME SYSTEMS

99

3

100



Cormet Staggered I Studsystem (system RSP 019 shown)

Cormet Twin frame system

72mm Cormet U Track withfixing at 600mm centres.

60mm Cormet I Studs at 300mm centres,staggered in track with Cormet ISC10 Clips

Timber sole plate ifrequired on uneven floors

Pairs of Cormet CStuds braced at

maximum 1500mmcentres using Cormet

V-Brace and extendedusing MFCP44

Primary Channel asrequired

Mineral woolsuspended incavity as required

Cormet U Track

52mm Cormet U Tracks

Cormet Twin Frame SystemsCormet non-load bearing Twin WallSystems constructed fromplasterboard facings on metal studshave considerable advantagescompared with traditional heavymasonry construction.

They are:

• lightweight

• quick to construct

• cost effective

• compact

• able to achieve high levels of fireresistance and acoustic insulation.

There are two types of Cormetsystems:

• staggered stud systems in singletrack

• twin frame systems constructedusing two separate metal frames,set a minimum of 40mm apart andbraced together.

Performance

The selection of system, and thetype, number and thickness of boardlayers will depend on the partitionheight and the performancerequired for fire resistance andsound insulation. Refer to theperformance table 3.1, 3.3, 3.5 and3.6.

Lafarge plasterboards are defined as Class 0 in accordance with NationalBuilding Regulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, textures and bondingcompounds and Cormet metalsystems are non-combustible whentested in accordance with BS 476:Part 4: 1970 and Euroclass A1.

Boarding

On partitions over single boardheight, stagger layers by a minimumof 300mm.

Stagger layers on each side ofpartition with previous layer.

Introduction





101

3

Staggered Stud Clip ISC10

3.12 Components for Cormet High PerformancePartitions

Component Lafarge Dimensionscolour code code (mm)metal thickness (mm)

I Stud blue gauge 0.5mm IS60/B 40 x 60

C Stud CS50/R 36 x 50 x 34

CS70/R 36 x 70 x 34

CS90/W 36 x 90 x 34

Staggered Stud Clip ISC10 12 x 27.5 x 38

V Brace VBRACE 100 x 42

Lafarge Resilient Tape RAFT50 12 x 50

6 6

3734

40

60

50, 70 or90

C Stud CS50/RC Stud CS70/RC Stud CS90/W

I Stud IS60/B

Components

Components

Components used are as on pages123-124, with additionalcomponents as shown on the right.

Colour coding is used to identifymetal thickness:

Red (R) 0.5mm

Blue (B) 0.7mm

White (W) 0.9mm

Maximum heights shown in tables3.1, 3.3. 3.5 and 3.6 refer to 0.50mmthick studs (red gauge). If 0.70mmthick studs (blue gauge) are usedthen the maximum heights can beincreased by 0.30m for single layersystems 0.60m for double layer.

All framing components aremanufactured to BS 7364: 1990specification for galvanised steelstuds and channels for stud andsheet partitions and linings usingscrew fixed gypsum wallboards.

38

27.5

12

3

14

Cormet V Brace VBRACE

100

42

Components

102



Cormet U Tracks

50mm rock mineral wool batts

Two layers 15mm Lafarge dBcheckwallboard (minimum total weight22 kg/m2 each side)

12.5mm Lafarge Standard wallboard(minimum weight 8 kg/m2)

Lafarge Direct Bond lining system

Overheight partitions Partitions with double layer boardingSuspension of mineral wool

Skirting screw-fixedto Cormet C Studs

Cormet C Studs

Cormet Twin Wall Solutions

All wallboard perimeters sealedwith Lafarge IntumescentAcoustic Sealant, to ensuresystem performance

Cormet Flat Strapbetween boards athorizontal joints inouter wallboardlayer

Cormet InsulationHold Strip tosupport insulationat 1200mmcentres vertically

All joints in adjacentlayers to be staggered


Cormet Drylining system

CormetV Brace



103

3

Ceiling and skirting detail

Fire rating up to 60 minutes, maximum deflection 10mm

Typical deflection head detail

Fire rating up to 60 minutes, maximum deflection 25mm

Typical door jamb detailCorner detail

Junction with external concrete wall T junction (plan)

12.5mm LafargeFirecheck wallboard


Wallboards andinsulation as specified

Studs as specifiedcut short by10mm


Lafarge Acoustic Tape

Cormet U Trackas specified


Packer of LafargeFirecheck asspecified

Cormet DeepFlange Track tosuit studs

Rockwool withCormet MetalAngle

Cormet Flat Strapbetween layers

Wallboards andinsulation asspecified

Wallboard as specified

Drylining system as specified

Lafarge Acoustic Tape

Cormet V Brace

Wallboard, studs andinsulation as specified


Wallboards andinsulation as specified

Cormet V Brace

Studs as specified


MIneral wool betweenend studs

LafargeIntumescentAcousticSealant

Cormet V Brace

Wallboard, studs andinsulation as specified

Studs as specified

Note on head packer:

Max deflection Packer required

8mm 1x12.5mm Firecheck*

10mm 1x15mm Firecheck*

15mm 1x19mm Plank

20mm 2x12.5mm Firecheck**


Notes:

* Firecheck can be substituted by Megadeco, Toughcheck or MR Firecheck

** Firecheck can be substituted by 25mm Firecheck Coreboard


104



Specification

Cormet Twin Wall Systems

Scope

Cormet Twin Wall partition usingtwin Cormet C Studs fitted intoCormet U Track at head and floorwhere superior fire and acousticperformance may be required.

Additional clauses






NBS clauses



System reference (Insert Lafarge system reference from Performance Tables)Location ........................Client reference ........................PerformanceMaximum height ....................m

Fire rating ....................mins

Airborne insulation ....................RwdB

Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234: ...................

Horizontal jointsIf partition height exceeds board height, use Cormet Channel MFIX or CormetFixing Strap FS90/W in single boarded partitions or Cormet Fixing Strap FS50/Ror FS90/W in double boarded partitions.



StudsTwo Cormet C Studs, reference CS50/R, CS60/R, CS70/R, CS90/R, CS146/R,CS70/B, CS90/B, CS146/B, CS90/W, CS70/Y, CS90/Y or CS146/Y, width 50, 60, 70,90 or 146mm at max 600mm centres

BracingCormet Acoustic Brace (VBRACE) at centres as defined in performance tables.

Floor trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.

Head trackCormet U Track, reference UT52/R, UT62/R, UT72/R, UT92/R, UT148/R, width 52, 62, 72, 92, 148mm fixed at 600mm centres.



















Notes:





105

3

Specification

Cormet Staggered I StudSystems

Scope

Cormet Staggered I Stud partitionusing Cormet I Studs in a staggeredpattern fitted into a single Cormet UTrack at head and floor. Used whereacoustic performance may berequired.

Additional clauses






NBS clauses





Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2




StudsCormet I Studs, reference CS70/R and IS60/B at max 300mm centres

BracingCormet Staggered Stud Clip, reference ISC10.

Floor trackCormet U Track, reference UT72/R at 600mm centres.

Head trackCormet U Track, reference UT72/R at 600mm centres.



















Notes:



106

P A R T I T I O N S


Case study

Cormet Resilient Bar provides a degreeof isolation between the wallboardsurface and the supporting structure,thus improving the acousticperformance of the partition.


P A R T I T I O N SCORMET RESILIENT BAR SYSTEMS

107

3

108



Cormet Resilient BarSystemsPartitions using the Cormet ResilientBar are constructed in the usual way,but the Cormet Resilient Bars arefixed to one side of the studpartition and faced with wallboard.

The benefit of Cormet Resilient Baris that it improves the acousticperformance of the partition withlittle increase in partition width orweight.

Performance

The selection of system, and thetype, number and thickness of boardlayers will depend on the partitionheight and the performancerequired for fire resistance andsound insulation. Refer to theperformance tables 3.3, 3.4, 3.5, 3.6and 3.9.

Lafarge plasterboards are defined as Class 0 in accordance with NationalBuilding Regulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, textures and bondingcompounds and Cormet metalsystems are non-combustible whentested in accordance with BS 476:Part 4: 1970 and Euroclass A1.

Introduction

Single frame system with Resilient Bar

Minimum 50mm glassmineral woolsuspended on CormetInsulation Hold Strip

Cormet Resilient Barat 600mm centresvertically

Cormet U-Track

17

45

6

19

Cormet Resilient Bar RBD3000



109

3

System reference RCP 56 (without Resilient Bar) RwdB 55 System reference RCP 55 (with Cormet Resilient Bar) RwdB 63

Note: superior performance with Cormet Resilient Bar

100125

160200

250315

400500

630800

10001250

16002000

25003150

40005000

20

30

40

50

60

70

80

90

100

Frequency (Hz)

Sou

nd

Red

uct

ion

Ind

ex R

(dB

)

RCP 56 BS EN ISO 717-1 Curve

100125

160200

250315

400500

630800

10001250

16002000

25003150

40005000

20

30

40

50

60

70

80

90

100

Frequency (Hz)

Sou

nd

Red

uct

ion

Ind

ex R

(dB

)

RCP 55 BS EN ISO 717-1 Curve


Where the Cormet Resilient Bar is tobe fixed to timber or metal studsthe following centres apply.

For single layer boarding fix CormetResilient Bar at 400mm centres.

For double layer board fix CormetResilient Bar at 600mm centres.

When fixing the Cormet ResilientBars, remember that the top CormetResilient Bar is fixed in the invertedposition, 50mm down from thesoffit. The final Cormet Resilient Barshould be installed no more than50mm from the floor. The remainingCormet Resilient Bars are installedat vertical centres to suit boarding,ie 600mm for double layer and400mm for single layer.

Table 3.13 Recommended screwlengths for fixing plasterboardto Cormet Resilient Bars


12.5 25

15.0 25

19.0 32

12.5 + 12.5 38

19.0 + 12.5 44

15.0 + 15.0 44

Screw fix the Cormet Resilient Barsto the Cormet studs using 25mmDrywall Self Tapping Screws.

Screw fix the wallboard to theCormet Resilient Bar only, ensuringthe screw does not touch the metalsubstrate.

For screw lengths for fixingplasterboard to Cormet ResilientBars see Table 3.13.

For fixing Cormet Resilient Bar totimber studs use 38mm Lafarge HighThread Screws.

Comparison of systems with and without Cormet Resilient Bar

Studs: 70mm Cormet C Stud (CS70/R) at 600mm centres

Facings: inner layer 19mm Lafarge Plank fixed with long edges horizontally

Facings: outer layer 12.5mm Lafarge Standard wallboard each side


110



Cormet Resilient Bar Solutions


Cormet Flat Strapbetween boards athorizontal joints inouter wallboardlayer


All joints in adjacentlayers to be staggered

All jointstapedand filled

Top Cormet Resilient Bar invertedto ensure fixing at 50mmmaximum from soffit

Cormet Drylining system

All wallboard perimeterssealed with LafargeIntumescent AcousticSealant to ensure systemperformance

Wallboardsscrewed toCormetResilient Bars

Bottom CormetResilient Barprovides fixing at50mm maximumfrom floor

Lafarge Direct Bond lining system

Cormet Resilient Bar spaced at600mm vertical centres and screwfixed to Cormet C Studs

See pages 83 to 87 for the range ofCormet Resilient Bar Partitions andtheir performance

Note: A baffle may berequired to maintainacoustic and fireperformance – seepages 140-141



111

3

Cormet U Track

Cormet InsulationHold Strip

Cormet C Studs

CormetResilient Bar

Cormet ResilientBar top railinverted

Cormet U Track

Single frame system with Cormet Resilient Bar – floor and ceiling details

50mm minimumglass mineral wooldensity 16kg/m3

6mm bead of LafargeIntumescent AcousticSealant aroundperimeter

Wallboard asspecified

Void filled withglass mineral

wool

High performance wall T junction


50mm glass mineralwool

Room 1

Room 2

Corridor

High performance wall head junction

Lafarge Resilient Tape Ref RAFT50Lafarge IntumescentAcoustic Sealant

CormetResilient Bar

50mm minimum glassmineral wool density16kg/m3

Void filled withmineral wool

Wallboard andstud asspecified

Junction with masonry wall

Wallboard setting out

Cut wallboard for dooropenings as shown toavoid joints runningparallel to framingstuds at sides of door

Door opening showndotted

Door opening detail


Lafarge Resilient Tape Ref RAFT50






LafargeIntumescent

AcousticSealant

112



Specification

Cormet Partition withResilient Bar

Scope

Partition constructed of Cormet CStuds with Cormet Resilient Bar toone side of partition to improveacoustic performance.

Additional clauses






NBS clauses




Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234 ....................




StudsCormet C Studs, reference CS50/R, CS60/R, CS70/R, CS90/R, CS146/R, CS70/B,CS90/B, CS146/B, CS90/W, CS70/Y, CS90/Y or CS146/Y, width 50, 60, 70, 90 or146mm at max 600mm centres

Resilient BarInstall Cormet Resilient Bar RBD3000 to one side of studs at 600mm verticalcentres, using 25mm Lafarge Drywall Self Tapping Screws.





















Notes:



Cormet Acoustic Homespan provides asingle solution for all modern domesticpartition requirements.

The sound absorbing C studs providemarkedly better performance thanrigid H studs and the system requiresno cross-noggings, contributing toreduced installation time.

Building Regulations now requireenhanced acoustic performance in arange of domestic partitions. CormetAcoustic Homespan uses acombination of high performancemetals, which minimise soundbridging, and dense core boardtechnology to provide 40 Rw dB soundperformance in a 75mm wide partitionwithout the need to install insulationwithin the system.

The Cormet Omega Acoustic Studhas a unique bulb design whichmeans less acoustic energy istransmitted through the stud and somore impact and airborne sound isabsorbed within the partition.Substituting the Cormet OmegaAcoustic Stud for a standard CormetC Stud increases the acousticperformance of the system withoutany loss in partition strength.


P A R T I T I O N SCORMET ACOUSTIC STUD SYSTEMS

113

3

114



Cormet Acoustic PartitionSystemsLafarge produce two acousticpartition systems:

• Cormet Acoustic Homespan

• Omega Acoustic Stud Partition

Cormet Acoustic Homespan

Cormet Acoustic Homespan is a75mm or 80mm nominal widthmetal stud partitioning system using44mm or 50mm metal CormetAcoustic Homespan C Studs set at450mm centres and one layer of15mm thick x 900mm wide AcousticHomespan wallboard fixed to eachside.

Cormet Acoustic HomespanPartition system is a lightweightdurable and high performancesystem:

• fast and easy to install

• cost effective against equivalentsize of timber stud

• eliminates nail popping and cracking

Performance

Cormet Acoustic Homespan C Studshave been specifically developed toachieve at least 40Rw dB soundrating without insulation in-linewith the latest Part E ApprovedDocument.

Cormet Acoustic Homespanwallboard has been designed toallow electrical cable installations tomeet N.H.B.C. guidelines and BS 7671requirements for electrical installation.

Lafarge Acoustic Homespanwallboard is defined as Class 0 inaccordance with National BuildingRegulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, metal systems, texturesand bonding compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Omega Acoustic Stud Partition

The Omega Acoustic Stud has aunique bulb design with engineeredtwin slots, which creates a resilientspring section. The spring sectionmeans less acoustic energy istransmitted through the stud and somore impact and airborne sound isabsorbed within the partition.

Introduction

Cormet Acoustic Homespan Partition System

Cormet Homespan U Track at floors and ceilings

Lafarge Intumescent Acoustic Sealant behind theperimeter of metal framing

15mm LafargeAcousticHomespanwallboardscrew fixed at300mm centreson studs and at200mm centresat perimeter

Cormet HomespanU Track Tracksnipped andfolded to formhead to dooropening

CormetAcousticHomespan C Studs at450mm centres

Cormet Acoustic Starter Stud usedin place of Cormet AcousticHomespan C Stud at door frames,wall abutments, corners and T junctions

Cormet Omega AcousticStud Partition

Omega AcousticStuds at 600mmcentres

Cormet U Track atfloors and ceilings

Wallboards asspecified

Lafarge IntumescentAcoustic Sealant behindthe perimeter of metalframing or at theperimeter of thewallboards

Lafarge IntumescentAcoustic Sealant atthe perimeter of thewallboards

Rubber grommet used to protect cable passing through service punch



115

3

Table 3.15 Acoustic Homespanwallboard

Homespan MR Homespan

Properties wallboard wallboard

Thickness 15mm 15mm

Width 900mm 900mm

Length 1800, 2400 2400mm

and 2700mm

Tapered edge Yes Yes

Square edge Yes No

36

44

34

50

36

38

6 6

6 6

Table 3.14 Cormet Acoustic componentsComponent Width Lengths Lafarge code

(mm) (mm)

Acoustic Homespan 44 2400 AHS44/R

C Stud 50 2400 AHS50/R

Acoustic Homespan 44 2400 CS44/R

Starter Stud 50 2400 CS50/R

Homespan 45 2400, 2700 UT45/R

U Track 52 3000 UT52/R

Homespan 45 2400 XDT45/R

U Track Deep Flange 52 3000 UDT52/B

Omega Acoustic Stud 70 2400, 2700, AS70/R

3000, 3600

90 3600, 3900, 4200 AS90/R


90 3000 UT92/R

Lafarge Intumescent 0.9 litres ACOUSTIC (intu)

Acoustic Sealant 0.38 litres ACO38 (intu)

C Stud AHS44/R

C Stud AHS50/R

Starter Stud CS44/R

45

70

26

45

30

52

U Track UT45/R

U Track UT52/R

U Track Deep FlangeXDT45/R

38

44

36

Starter Stud CS50/R

38

50

36

Components

Substituting the Omega AcousticStud for a standard Cormet C Studincreases the acoustic performanceof the system and improves theoverall RwdB figure with nosignificant loss of partition strength.For individual system performancesee Cormet Omega Stud partitionsin table 3.8.

System components

All metal components aremanufactured to BS 7364: 1990specification for galvanised steelstuds and channels for stud andsheet partitions and linings usingscrew fixed gypsum wallboard.

Flanges have deep knurlings foreasier screw fixing and plasterboardalignment.

Cormet Acoustic Homespan Studs and Tracks

Omega Acoustic Studs

34

6 6 6 6

3636 34

70 90 90

70

30

30

U Track UT72/R

U Track UT92/R

AS70/R AS90/R

116



Application details

Cormet Acoustic Homespan Omega Acoustic Partition


Cormet FixingChannel or CormetFlat Strap FS90/W athorizontal joints inouter wallboard layer


All joints to occuron centre ofCormet Studs

All jointstapedand filled

Cormet U Track

Cormet OmegaAcoustic Studs at600mm centres


15mm Lafarge AcousticHomespan wallboard

Cormet AcousticHomespan C Studs at450mm centres


Timber infill inweb of stud atdoor openings

All wallboardperimeters sealedwith LafargeIntumescentAcoustic Sealantto ensure systemperformance

Drylining electrical boxesare available to alloweasy installation withoutthe need for timbernoggings. Note that abaffle may be needed tomaintain the acousticand fire performance ofthe partition

Cormet AcousticHomespan StarterStud

Floor track fixed at 600mmcentres – use timber soleplate to underside of trackon uneven floors

Rubber grommet used to protect cable passingthrough service punch

Cormet HomespanU Track snippedand folded to formhead to dooropening



117

3

Application details

Ceiling detail (section) 10mm deflection head – 60 minute fire rated

Alternative skirting fixing details (sections)

Junction with masonry wall (plan) Partition end (plan) T junction (plan)

Corner junction (plan)

Typical door jamb detail (plan)

135º splayed corner (plan)


Cut wallboard fordoor openings asshown to avoidjoints runningparallel toframing studs at side of door

Door openingshown dotted

Cormet U Track fixedat 600mm centres


Cormet AcousticHomespan C Stud 6mmshorter than floor toceiling height

15mm Lafarge Firecheck

Cormet C Stud to stop10mm short of CormetU Track to allow fordeflection

10mm allowance fordeflection betweenCormet U Track andCormet FS90/W FlatStrap


Cormet U Track

Cormet C Stud

Cormet FS90/WFlat Strap


Timber infill in webof stud 32x38mm

Door lining

15mm Lafarge Acoustic Homespan wallboard

Cormet Acoustic Homespan CStuds fixed together at 600mmvertical centres, and to floorand ceiling Cormet U Tracks

Cormet Acoustic Homespan CStuds fixed together at 600mmcentres, and to floor andceiling Cormet U Tracks

15mm LafargeAcoustic Homespanwallboard

Cormet MFC 135Splayed SupportAngles

Cormet AcousticHomespan C Stud

Lafarge DirectBond liningsystem

Cormet Drylinerlining system

15mm LafargeAcousticHomespanwallboard


Cormet Acoustic HomespanDeep Flange U Track

Cormet Acoustic HomespanU Track on sole plate


Cormet AcousticHomespan Starter Stud

118



Cormet Acoustic HomespanPartition

Scope

A lightweight, durable and highperformance partition systemsdeveloped for the housing market.

The system has been designed toachieve a 40 RwdB sound ratingwithout insulation and meets BS 7671 requirements for electricalinstallation.

Additional clauses


– Expansion/movement joints

– Health and safety

– Storage of Materials

– Site conditions and workmanship

NBS clauses


To complete the clause select theappropriate data as indicated on theright.





Fire resistance: 30 mins

Airborne sound insulation ....................Rw dB

Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234: Heavy



StudsCormet Acoustic Homespan Studs, reference AHS44/R or AHS50/R, width 44 or50mm at max 450mm centres.

Head deflection allowanceConsult with Lafarge Plasterboard Ltd Technical Dept for recommendationsand details.

Floor trackCormet U Track, reference UT45/R or UT52/R, width 45 or 52mm fixed at600mm centres.

Head trackCormet U Track, reference UT45/R or UT52/R, width 45 or 52mm fixed at600mm centres.







BoardingSingle layer of 15mm Lafarge Homespun wallboard to each side.

Board fixingsLafarge Drywall Self Tapping screws at 300mm centres.

Length: 32mm

FinishingLafarge Taping and jointing system

Primer/sealer1 coat Lafarge Universal Sealer prior to paint or wallpaper, or

2 coats Lafarge Drywall Sealer when vapour control is a consideration.



Notes:





119

3

Omega Acoustic Partition

Scope

A lightweight, durable and highperformance partition systemdeveloped to provide improvedsound performance.

Additional clauses






NBS clauses






Fire resistance: ....................mins

Airborne sound insulation ....................Rw dB

Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234: ....................



StudsOmega Acoustic Studs, reference AS70/R or AS90/R, width 70 or 90mm at max600mm centres.


Floor trackCormet U Track, reference UT72/R or UT92/R, width 70 or 90mm fixed at600mm centres.

Head trackCormet U Track, reference UT72/R or UT92/R, width 70 or 90mm fixed at600mm centres.














FinishingLafarge Taping and jointing system

Primer/sealer1 coat Lafarge Universal Sealer prior to paint or wallpaper, or

2 coats Lafarge Drywall Sealer when vapour control is a consideration.



Notes:



120



Step oneMark out the line ofthe partition. FixCormet U Track totimber or concretefloor along thesetting out line at600mm centres,using suitable fixings.

Step twoCut the Cormet UAcoustic Stud tolength as necessaryusing Lafarge tinsnips. Studs shouldbe cut 5mm shorterthan the floor toceiling height.

Step threeUsing a spirit level toensure it is plumb, fixa Cormet Stud to theend wall, withsuitable fixings at600mm centres.

Step fourPlace the ceilingCormet U Track ontop of the end wallstud. Then, using anCormet AcousticStud and spirit level,ensure the oppositeend of the ceiling UTrack is plumb withthe floor U Track andscrew-fix it intoposition at 600mmcentres.

Step fiveInstall allintermediateAcoustic C Studs. CutStuds 5mm shorterthan the floor toceiling height toallow for floorvariations. Insert theStuds into theCormet U Tracks at450mm centres andtwist to lock. Theintermediate studsshould all face thesame way. To allowadjustment whenfixing plasterboards,Studs should not bescrew fixed to theCormet U Tracks.

Step sixUse Starter Studs, ifrequired, at dooropenings, corners, T junctions and stopends as shown indetails. These extrastuds must be fixedto ceiling and floor U Tracks with LafargeWafer Head SelfTapping Screws orusing a crimpingtool.

1

2

3

4

5

6

Installation

Note: When installing the U Tracksdirectly onto new concrete which hasnot completely dried out, a dampproofing membrane should be used.On uneven floors a timber sole platemay be required.

To maximise the acoustic and fire performance useLafarge Intumescent Acoustic Sealant and seal the gapbetween the perimeters and the wallboard oralternatively a continuous bead can be applied to theback of the Cormet U Tracks and perimeter studs.

Note: Lafarge intumescent Acoustic Sealantshould be applied as shown above.



121

3

Step sevenForm the doorheader by using apiece Cormet UTrack. Cut the trackso that it is equal tothe width of thedoor frame plus aminimum 300mm, inorder to allow150mm at each endto be cut and foldeddown.

Step eightSecure the header tothe Cormet AcousticStuds using acrimping tool orLafarge Wafer HeadSelf Tapping Screws.

Step tenFix Lafargewallboard to oneside of the partition.Cut the board 5mmshorter than thefloor to ceilingheight, butt firmlyagainst the ceilingand fix with LafargeDrywall Self-TappingScrews at 300mmcentres in the field ofthe board and200mm at thepartition perimeter.

Step elevenWhen one side iscomplete, repeat forthe other side of thepartition, ensuringthat the joints arestaggered.

7

8

10

11

Installation

Step nineForm a timberbackgroundconstruction tocreate a secure fixingfor the door frameby placing a suitablysized timber insertinto the back of doorframe studs andheader Track. Securethese timbers usingLafarge Drywall HighThread Screwsthrough the face ofthe studs into thetimber.

Step twelveFinish as requiredprior to decoration.Refer to Section 7.

9 12

122

P A R T I T I O N S


Case study


P A R T I T I O N SCORMET C STUD SYSTEMS

123

3

The wide range of Cormet MetalPartitions allows repeatable,guaranteed performance to beachieved across a broad range ofapplications from apartments, cinemasand factories to hospitals, museums,and schools.

124



Cormet PartitionsCormet metal stud partitioning is aneconomical friction-fit system usedfor the assembly of frames for non-loadbearing partitions. The uniquedesign of the components ensureshigh strength with easy installation.

Cormet partitions are suitable fordomestic and commercial use. Theyare strong high performance systemswhich are:

• cost effective

• lightweight

• versatile

• able to achieve high levels of fireresistance, acoustic and thermalinsulation.

Performance

The selection of Cormet C Stud size,and the type, number and thicknessof plasterboard layers will dependon the partition height and theperformance required for fireresistance and sound insulation.Refer to the performance tables 3.1to 3.6.

Lafarge PerformanceBoard* PartitionsLafarge performance partitionscomprise Cormet C Stud framingand Lafarge performancewallboards to provide a strongerpartition which is more resistant toknocks and scratches.

In addition, Lafarge performancepartitions provide superior soundinsulation and fire resistance.

Performance

Lafarge performance wallboards aredefined as Class 0 in accordancewith National Building Regulations1991 Approved DocumentsB1/2/3/4/5 Fire Safety and BuildingStandards (Scotland) Regulations1990, Regulation D2 when tested toBS 476: Part 6: 1989 and Part 7: 1997and Euroclass A2. The gypsum coreis classified as non-combustiblewhen tested in accordance with BS476: Part 4: 1970 and Euroclass A1.Lafarge jointing compounds, metalsystems, textures and bondingcompounds are non-combustiblewhen tested in accordance with BS476: Part 4: 1970 and Euroclass A1.

Introduction

Intermediate studsinserted in floorand ceiling tracks

Cormet trackfixed to soffit at600mm centres

Perimeter Cormetstud fixed to endwall at 600mmcentres

LafargeIntumescentAcoustic Sealantaround perimeter

Single layer boarding: jointson opposite faces offset, alljoints taped and filled

Cormet track fixed tofloor at 600mm centres

Timber sole plate, if requiredon uneven floors

Partition with single layer boarding

Lafarge Intumescent Acoustic Sealantapplied around perimeter of partition

LafargeIntumescentAcoustic Sealant toback of all tracksand end studs

Note:* Toughcheck, dBcheck, Firecheck,Megadeco and Moisture ResistantFirecheck.



125

3

Components

Table 3.16 Cormet Partitions componentsComponent Width (mm) Length (mm) Lafarge code

C Stud 50 2400, 2700, 3000, 3600 CS50/R

Red gauge 0.5mm 60 2400, 2700, 3000, 3600, 4200 CS60/R

70 2400, 2700, 3000, 3300 CS70/R

3600, 4200, 4800

90 2700, 3000, 3600, 4000, 4200 CS90/R

146 2400, 2700, 3000 CS146/R

3600, 4200, 4800

C Stud 70 3600, 4200 CS70/B

Blue gauge 0.7mm 90 3600, 4200 CS90/B

146 3600, 4200, 4800, 5400, 6000 CS146/B

C Stud 90 4800, 6000, 7200 CS90/W

White gauge 0.9mm

C Stud 70 4800 CS70/Y

Yellow gauge 1.2mm 90 3600, 4800, 6000 CS90/Y

146 6000 CS146/Y


Red gauge 0.5mm 62 3000 UT62/R

72 3000 UT72/R

92 3000 UT92/R

148 3000 UT148/R

U Track Deep Flange 52 3000 UDT52/B

Blue gauge 0.7mm 62 3000 UDT62/B

72 3000 UDT72/B

92 3000 UDT92/B

148 3000 UDT148/B

U Track Extra Deep 72* 3000 UXT72/B

Flange 92** 3000 UXT92/W

*Blue gauge 0.7mm 148** 3000 UXT148/W

**White gauge 0.9mm

Fixing Channel 99 2400 MFIX

White gauge 0.9mm

Metal Angle 23 x 30 3600 MFC2330

25 x 25 3600 MFC2525

25 x 50 3600 MFC2550

Splayed Corner 50 x 50 3600 MFC135

Support Angle

Flat Strap 50 2400 FS50/R

90 2400 FS90/W

Lafarge Intumescent 0.9 litre ACOUSTIC (INTU)

Acoustic Sealant 0.38 ACO 38 (INTU)

Lafarge Drywall – 25 to 76 See page 327

screws as appropriate

Component specifications may vary from those shown.

The range of Cormet partitioncomponents is shown in the tableopposite and in the drawings on thefollowing page.

Rigidising plus vertical ribs in thestud webs ensures stiffness withstrength, whilst the fold-outs allowfor better services access. Theflanges have deep knurling foreasier screw-fixing, and plasterboardalignment guides, all of whichmakes installation even easier.

Colour coding is used to identifymetal thickness: Red (R) 0.50mm Blue (B) 0.70mm White (W) 0.90mmYellow (Y) 1.2mm.

Maximum heights shown inperformance tables 3.1 to 3.8 referto 0.50mm thick studs (Red gauge).If 0.70mm thick studs (Blue gauge)are used the maximum height canbe increased by 0.30m for systemsfaced with a single layer ofplasterboard and by 0.60m fordouble layer systems.

Cormet Deep Flange U Tracks areused for partitions with heightsabove 4.2m, or at the soffit where adeflection head is required.

Cormet Fixing Channel MFIX orCormet Flat Strap FS90/W can befixed horizontally between twometal studs to provide extra supportand maintain fire integrity of thesystem when board heights areexceeded.

As an alternative Cormet Flat StrapFS50/R may be used betweenwallboards on double layer boardsystems.

All components are manufactured to BS 7364: 1990 Specification forgalvanised steel studs and channelsfor stud and sheet partitions andlinings using screw fixed gypsumwallboards.

126



U TrackUT52/R

U TrackUT62/R

U TrackUT148/R

U Track Deep

Flange UDT62/B

U TrackDeep

FlangeUDT148/B

U Track Deep Flange

UDT52/B

U TrackUT92/R

U TrackUT72/R

U TrackDeep

FlangeUDT72/B

U TrackDeep

FlangeUDT92/B

Fixing ChannelMFIX

30

50

50

99

52

6

U Track Extra DeepFlange UXT72/B

U TrackExtraDeep

FlangeUXT92/W

U TrackExtraDeep

FlangeUXT148/W

70

72

Metal AngleMFC2330

Metal AngleMFC2525

Metal AngleMFC2550

25

25

25

23

30

Components

Splayed CornerSupport MFC135

50

50

Flat StrapFS90/WFS50/R

90

50

135º

6 6

36 34

50

C StudCS50/R

60 70 90 146

C StudCS60/R

C StudCS70/RCS70/BCS70/Y

C StudCS90/RCS90/BCS90/WCS90/Y

C StudCS146/RCS146/BCS146Y

52 62 72 92 148

62 72 92 148

92 94 148

U TrackExtraDeep

FlangeUXT94/BUXT94/W

KEY

ProductCS: C Stud

IS: I Stud

UT: U Track

UDT: Deep Flange Track

UXT: Extra Deep Flange Track

72

36 34

52

30 30

52

50 50

52

70 70

Flange Dimensions (mm)

C Stud CS50/R U Track UT52/R U Track DeepFlange UDT52/R

U Track Extra DeepFlange UXT72/R

Product/R Red gauge

0.50mm

/B Blue gauge0.70mm

/W White gauge0.90mm

/Y Yellow gauge1.20mm

CS50/R

Denotessectionprofile

Denotessectionwidth

Denotessectiongauge



127

3

Application details

Joints on opposite faces offset

All joints taped and jointed

Joints on opposite faces offset, joints staggered between layers

All joints in the outerlayer taped and jointed

Partition with single layer boarding

Partition with two layer boarding

System assembly

Framing

Set out Cormet U Tracks alongthe setting out line of thepartition at floor and ceiling, andfix at 600mm centres. If applyingthe Cormet U Tracks direct tonew concrete which has notcompletely dried out, a dampproofing membrane should beused.

Timber sole plates

For floors that are uneven orbeing screeded after theinstallation of the partition, atimber sole plate may berequired.

Stud lengths

Cut Cormet C Studs 5mm shorterthan the floor to ceiling height toallow for floor variations. Insertthe Cormet C Studs into theCormet U Tracks and twist tolock. Perimeter Cormet C Studsshould be fixed at 600mm centreswith the webs flat againstabutting walls or partitions.

The intermediate Cormet C Studsshould all face the same way andbe positioned at either 400mm or600mm centres as required.Arrange the framing so thatplasterboard widths of less than300mm are avoided. Intermediatestuds should not be fixed toCormet U Tracks to allow foradjustment when fixing boards.

Openings

Use extra Cormet C Studs atopenings, corners, junctions andstop ends, fixing to head andfloor U tracks with Lafarge WaferHead Screws or crimping tool.

Doors and windows can be builtinto the partitioning bypositioning and fixing full-lengthstuds on each side of theopenings. Cormet U Track is cutto form the head of the opening,and lined with 38mm deeptimber where required.

Make provision for fixtures asdescribed in table 3.23.



Application details

Mineral wool insulationsuspended on CormetInsulation Holder

Electrical boxes

Rubber grommets

Double boardedCormet C Stud

partition, wallboardas specified

For an extensiverange of partition

types see systemreferences

pages 28-31

All wallboard perimeterssealed with LafargeIntumescent Acoustic Sealantto ensure system performance

Drylining electricalboxes are availablethat allow easyinstallation withoutthe need for timbernoggings

Cable protection atservice cut-outs

Floor track fixed at600mm centres

(Use timber sole plateto underside of track

on uneven floors)

128

Suspension of mineral wool quiltOverheight partition Partition with double layer boarding

30mm glass/rockmineral wool quilt

Cormet InsulationHold Strip Joints on opposite

faces offset

All jointstaped andfilled

Cormet Fixing ChannelMFIX to provide supportfor horizontal board edges

Single boarded CormetC Stud partition,

wallboard as specified

Timber subframeto door opening

CormetInsulation HoldStrap positionedat 1200mmvertical centres

Wallboards fixed at200mm centres

around perimeter ofeach board and at300mm centres inthe centre of the

board



129

3

Application details

Ceiling detail (section)


Cormet U Track fixedat 600mm centres

Cormet C Stud 5mmshorter than floor toceiling height

10mm deflection head fire rated up to 60 minutes(section)

Partition end (plan) T junction (plan)Junction with masonry wall(plan)

Corner (plan)

Typical door jamb detail (plan)

Alternative skirting fixing details (sections 1 to 3)


Cut wallboard for dooropenings as shown toavoid joints runningparallel to framingstuds at sides of door

Door opening showndotted

Cormet C Studs fixedtogether at 600mmcentres, and to floor andceiling Cormet U Tracks

Cormet C Studs fixedtogether at 600mmcentres, and to floor andceiling Cormet U Tracks


Cut Cormet C Stud to stop10mm short of Cormet U Trackas specified to allow fordeflection

10mm allowance fordeflection betweenCormet U Track andCormet Flat Strap FS90/W

Cormet U TrackDeep Flange

Cormet Flat StrapFS90/W

Lafarge Direct Bondlining system

Cormet Drylinerlining system

Timber subframeshown here facefixed, alternative isto infill timber intothe Cormet Stud

Door liningWallboard asspecified

Cormet starter stud


Offcuts of studs boxed together and fixedvertically into track midway between studs

Cormet U Trackon sole plate



Cormet U Trackwithout sole plate

Wallboard asspecified

Cormet C Stud

15mm Lafarge Firecheck

Cormet U TrackDeep Flange

1 2 3

135º splayed corner (plan)

Cormet MFC 135Splayed SupportAngles

CormetC Stud

Note on head packer:Max deflection Packer required



15mm 1x19mm Plank


25mm 2x15mm Firecheck*Notes: * Firecheck can be substituted by Megadeco, Toughcheck or MR Firecheck

** Firecheck can be substituted by 25mm Firecheck Coreboard

130




Cormet Metal StudPartitions

Scope

Metal stud partitions withindomestic and commercial buildingswhere maximum height may exceedboard lengths and/or where fire andacoustic performance is required.

Additional clauses






NBS clauses




Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234 .........................Horizontal jointsIf partition height exceeds board height, use Cormet Channel MFIX or CormetFixing Strap FS90/W in single boarded partitions or Cormet Fixing Strap FS50/Ror FS90/W in double boarded partitions.



StudsCormet C Studs, reference CS50/R, CS60/R, CS70/R, CS90/R, CS146/R, CS70/B,CS90/B, CS146/B, CS90/W, CS70/Y, CS90/Y or CS146/Y, width 50, 60, 70, 90 or146mm at max 600mm centres


BracingCormet Flat Strap FS50/R at mid height.





















Notes:





131

3

Installation

Step twoCut Cormet U Track(and Cormet C Studs)to length asnecessary usingLafarge tin snips.

Cormet C Studs tobe cut 5mm shorterthan floor to ceilingheight.

Step threeInstall a Cormet CStud, using a spiritlevel to plumb onend wall; screw fix at600mm centresusing suitable fixings.

Note: Fix opposite endwall Cormet C Stud onlyafter ceiling Cormet UTrack has been installed.

Step fourPlace ceiling CormetU Track onto end wallCormet C Stud. Usinga Cormet C Stud andspirit level, plumbopposite end ofceiling U track withfloor U track andscrew-fix into positionat 600mm centres.

Fix remaining endwall Cormet C Stud.

Step fiveMark floor and ceilingat centres as specifiedbelow for the locationof intermediate C Studs:

At max. 400mmcentres for 9.5mmplasterboard or600mm centres for12.5 mm plasterboard.Arrange the framingso that plasterboardwidths of less than300mm are avoided.

See step 9 for installation ofintermediate studs.

Step sixUse extra Cormet C Studs at openings,corners, T junctionsand stop ends asshown in details.These extra studsmust be fixed tohead and floorCormet U Trackswith Lafarge WaferHead Self TappingScrews or crimpingtool.

Note: The door framebackground metalconstruction detailsshown above, form oneof three possiblealternatives.

1

2

3

4

5

6

To maximise the acoustic and fire performance useLafarge Intumescent Acoustic Sealant and seal the gapbetween the perimeters and the wallboard oralternatively a continuous bead can be applied to theback of the Cormet U Tracks and perimeter studs.

Step oneFrom a fixed pointmark out the line ofpartition. Fix CormetU Track to timber orconcrete floor alongthe setting out lineof the partition at600mm centres usingsuitable fixings.

Note: A timber soleplate may be requiredon uneven floors orwhen partitions areinstalled prior to screedbeing laid.

If applying the Cormet U Trackdirect to new concrete which has not completely dried out, adamp proofing membrane shouldbe used.

132



Step sevenForm the doorheader by using a piece of Cormet U Track. The lengthshould be equal tothe width of the doorframe plus aminimum of 300mmin order to allow150mm at each endto be cut and foldeddown.

Step eightSecure header ontoCormet C Studsusing a crimping toolor Lafarge WaferHead Self TappingScrews.

This detail appliesto all door frameassembly alternatives.See step 5.

Step nineInstall all intermediateC Studs.

Cut Cormet C Studs5mm shorter thanthe floor to ceilingheight to allow forfloor variations. Insertthe Cormet C Studsinto the Cormet UTracks and twist tolock. The intermediateCormet C Studsshould all face thesame way. Theyshould not be fixedto Cormet U Tracksin order to allow foradjustment whenfixing plasterboards.

Step tenForm as required,one of the followingalternative timberbackgroundconstructions forfixing door frames:

(a) Fix a 38mm x38mm timber insertinto back of doorframe Cormet CStuds and header.Secure using LafargeDrywall High ThreadScrews through faceof Cormet C Studinto the timber.

(b) Fix a timbersubframe to theface of the doorframe Cormet CStuds and headerusing LafargeDrywall Self TappingScrews.

Step elevenInstall door frame into position andsecure by screwingthrough the doorframe into one of the alternativebackgroundconstructions aboveusing Lafarge DrywallHigh Thread Screws.Ensure that the screwspenetrate each of thecomponents formingthe backgroundconstructions.

Step twelveInstall plasterboardto one side of the partition. Cutplasterboard 5mm to 8mm shorter thanthe floor-to-ceilingheight, butt firmlyagainst the ceilingand fix with LafargeDrywall Self-TappingScrews at 300mmcentres.

Note: Use ToughcheckDrywall Screws forToughcheck Partitionsand Checkpoint SelfTapping Screws fordBcheck Partitions.

7

8

9

10

11

12

Installation

Timber stud partitions are frequentlyused in timber-frame houses, in smallrenovation projects and in homeextensions where they may be loadbearing or non-load bearing,depending on specification.

Plasterboard can be screw fixed totimber, which offers superiorperformance and limits the risk of nailpopping caused by the timber sub-frame drying out. Alternativelyplasterboard can be nailed directly tothe timber.


P A R T I T I O N STIMBER STUD SYSTEMS

133

3

134



Lafarge Intumescent AcousticSealant around perimeter

Timber studs: for sizeand centres seeperformance tables

Single layer boarding, joints on oppositefaces offset, all joints taped and filled

Timber soleplate

Timber stud partitionLafarge Drywall TimberStud PartitionsTimber stud partitions are suitablefor limited heights, and typically fordomestic use.

Performance

The selection of stud size and type,number and thickness of boardlayers will depend on the partitionheight and performance requiredfor fire resistance, sound insulationand duty rating to BS 5432: Part 2.Refer to the performance tables 3.9to 3.10.

Lafarge plasterboards are defined asClass 0 in accordance with NationalBuilding Regulations 1991 ApprovedDocuments B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.The gypsum core is classified as non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1. Lafarge jointingcompounds, metal systems, texturesand bonding compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

At board perimeterscrew fix at 200mmcentres or nail fix at150mm centres

Introduction

In the field of theboard screw fix at300mm centres ornail fix at 150mmcentres

Timber stud partition – high performance wall(RFL 050 shown)

50mm glass mineralwool minimumdensity 16 kg/m3

Timber stud

Cormet FlatStrap

Air gap

Two layers of 15mmLafarge Firecheckwallboard

High performance walls

High performance timber framedwalls are constructed from twoindependent timber frames with acavity between. Each side is linedwith two layers of 15mm LafargedBcheck wallboard. 50mm glassmineral wool insulation is appliedbetween the studs to both frames. A brace secures the two frames atmid height.

High performance walls should bekept free of service penetrations. If this is not possible, baffle detailsshould be installed – for guidancerefer to pages 150-151, which offersa number of solutions for Cormetmetal stud partitions, which workon the same principles for timberframe, or call the TechnicalEnquiryline for advice.



135

3

Table 3.17 Timber stud componentsComponent Dimensions Lafarge code

Lafarge Intumescent 0.9 litres ACOUSTIC (INTU)

Acoustic Sealant 0.38 litres ACO38 (INTU)

Lafarge Drywall High 32-63mm 32DHT25, 38DHT25

Thread Screws 41DHT25, 51DHT25

63DHT25

Cormet Resilient Bar 3000mm RBD3000

Drywall Nail 30-65mm NAIL30ZINC

NAIL40ZINC

NAIL50ZINC

NAIL60ZINC

Components

The components used in LafargeDrywall Timber Stud partitions arelisted in table 3.17.

System assembly

All framing must be straight, plumband true, and provide a firm supportfor the plasterboards. Timber studsshould be installed at maximum400mm centres for 9.5mmplasterboard, and at maximum600mm centres for 12.5mm and15mm plasterboard. Framing shouldbe arranged so as to avoidplasterboard widths of less than300mm. Plasterboard edges must besupported at all openings andcorners. All framing should providea minimum bearing width for theplasterboard of not less than 38mm.The timber studs must be fixed totimber floor and ceiling plates.

The plasterboard should be fixedwith Lafarge Drywall High ThreadScrews at 200mm centres at theboard perimeter and 300mm centresin the field of the board, or LafargeDrywall Nails at 150mm centres forboth perimeter and field ofboarding. See tables 3.19 and 3.20 for recommended lengths of nailsand screws.

Where sound insulation is required,apply a 6mm continuous bead ofLafarge Intumescent AcousticSealant around the perimeter of theframing or wallboard.

Lafarge Cove provides a neat finishto the wall/ceiling junction. SeeSection 7.


Where the Cormet Resilient Bar is tobe fixed to timber studs thefollowing centres apply.

For single layer 12.5mmplasterboard fix Cormet Resilient Barat 400mm centres horizontally.

For double layers of 12.5mmplasterboard and thickerplasterboard, fix Cormet ResilientBar at 600mm centres horizontally.

Fix initial Cormet Resilient Bar50mm down from ceiling, lastResilient Bar 50mm from floor.

Screw fix the Cormet Resilient Barsto the timber supports using 32mmDrywall High Thread Screws.

Screw fix the plasterboard to theCormet Resilient Bar only, ensuringthe screw does not touch the timbersubstrate.

Components

Table 3.20 Recommended naillengths for timber framingConstruction Plasterboard Nail Length

thickness (mm) (mm)

Single layer 12.5 40

15.0 40

19.0 50

Double layer 12.5 + 12.5 50

12.5 + 19.0 65

15.0 + 15.0 65

Table 3.19 Recommended screwlengths for timber framingConstruction Plasterboard Screw

thickness (mm) length (mm)

Single layer 6 32

12.5 38

15.0 38

19.0 41

Double layer 6 + 6 38

12.5 + 12.5 51

12.5 + 19.0 63

15.0 + 15.0 63



12.5 25

15.0 25

19.0 32

12.5 + 12.5 38

19.0 + 12.5 44

15.0 + 15.0 44

17

45

6

19


136



Application details

Timberseparatingwall

Two layers 15mm LafargedBcheck wallboard

Typical timber frame construction

Two layers of 50mm mineralwool insulation betweentimber studs

38 x 89mm timber studsat 600mm centres

12.5mm LafargeEcheck wallboard

each side ofpartition

Timber studs at600mm centres

25mm mineralwool insulation

between timberstuds

Internaltimber

partition



All joints to occuron centre oftimber studs

Timber nogging tosupport horizontaledge of plasterboard

Internaltimber floor



137

3

Application details

Party wall junction with partition – alternatives(plan)

Seal allperimeter

joints withtape or caulkwith sealant

Corner

T junction – acoustic (plan)

Door jamb

Partition head and sill Timber separating wall junction with internal floor

Wallboard andinsulation as specified



Seal allperimeterjoints withtape or caulkwith sealant

Full heighttimber blockingto provide fixingfor partition andreduce flankingsound

Flexiblecavitystop

Wallboardand insulation

as specified

Separatingwall liningcontinuous

Timberspacer

Partition end (plan)



Wallboard andinsulation asspecified

Seal corner joint withtape or caulk withsealant


Lafargewallboardandinsulation asrequired

T junction – alternative



138



Lafarge Timber StudPartitions

Scope

Internal walls, partitions, separatingwalls and external walls constructedusing softwood timber studs linedwith Lafarge plasterboards.

Additional clauses






NBS clauses



The Lafarge Plasterboard websitecontains a full set of NBS clauses,completed for each LafargePlasterboard system. See:www.lafargeplasterboard.co.uk/nbssearch/index.asp0




Fire rating ....................mins


Thickness ....................mm

Weight ....................kg/m2

Grade to BS 5234 .........................

Horizontal jointsIf partition height exceeds board height, use horizontal timber noggings toprovide support for fixings.



Timber framingTimber studs ..............mm x ..............mm at max 600mm centres

Timber sole plate ..............mm x ..............mm fixed at 600mm centres.

Timber head plate ..............mm x ..............mm fixed at 600mm centres.




Board fixingsLafarge Drywall Self Tapping Screws at maximum 300mm centres,


Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm, or

Lafarge Drywall Nails at maximum 150 mm centres at the board perimeter andmaximum 200mm centres in the field of the board,

Length, inner layer (Select from 30, 40, 50, 65)mm

Length, outer layer (Select from 30, 40, 50, 65)mm





Notes:



Masonry separating walls remain byfar the most common constructionmethod within the housebuildingmarket. However, in conjunction withLafarge drywall systems the overallperformance with regard to thermaland sound, as well as the speed ofcompletion, can be greatly improved.

Drywall Benefits and TypicalSystem SolutionsDirect Bond to inner skin ofconstruction

• Reduction in wet trades

• Quicker completion times

• Reduced drying out time

• Improved thermal performance

Cormet Dryliner to inner skin ofconstruction

• Improved thermal performance

• Reduction in wet trades

• Quicker completion times

• Reduced drying out time

• Creates cavity in which services canbe installed

• Greater acoustic performance


P A R T I T I O N SMASONRY SYSTEMS

139

3

140

P A R T I T I O N SMASONRY SYSTEMS


Junction with external cavity wall

5mm (minimum) foamedpolyethylene resilient strip

Blockwork and cavity width asRobust Detail specification

Party wall junction(section with internal floor)

Party wall junction(section with party floor)

Separating floor as RobustDetail E-FC-1

Flexible cavity stop

12.5mm Lafarge Standardwallboard on dabs

Cormet Suspended Ceiling system with75mm (minimum) void and one layer of

Lafarge Echeck wallboard


Concrete planksbuilt into wall

Cavity insulation notshown for clarity

Robust Detail Separating Wall – types E-WM-3, E-WM-4, E-WM-5 and E-WM-6

8mm cement/sand scratch coat towhole wall

Continuousribbon ofadhesive

8mm cement/sand render

Timberfloorsupportedon joisthangers


Drywall solutions are becomingincreasingly popular due to the ease of construction and flexibility offeredto the architect to accommodatespecialist design features – whilebeing able to maintain the practicalrequirements of fire and acousticperformance.

In the following section we offer a wide range of typical drywallsolutions. If the detail you require is not shown, please contact ourEnquiryline.


P A R T I T I O N SSPECIALIST JUNCTIONS AND INSTALLATIONS

141

3

142



Deflection head details

Detail of telescopic head – exploded view

Studs to be cutshort by 80mmplus deflection

Head track UXT148/W

Stud CS146/R

Length = 370mm plusdeflection required

TrackUXT148/W

146mm widestud as specified

Detail of telescopic head– assembled view

The box totallyencloses the C

stud and holds itin place.

The C stud slidesup and down

within the box

The telescopic deflection head is foruse where deflection is greater than40mm. The detail can allow fordeflection up to 150mm. A typicalarrangement for enclosing thetelescopic head and maintain the fire performance is shown here.

Twin wall 10mm deflection head detail up to 60 minutes fire rated

15mm LafargeFirecheck wallboard


Lafarge U Track DeepFlange

Studs as specified,cut short 10mm

Wallboards as specified,cut short 10mm

Insulation asspecified

Cormet V Brace

Twin wall deflection head detail up to 60 minutes fire rated

Rockwool withcloak angle

Lafarge U Track DeepFlange

Cormet FS50 Flat Strapbetween layers, or as

opposite

Wallboards as specified,cut short 10mm


Cormet V Brace

Lafarge Firecheck as packer fordeflection – see notes below

Purlin

CS146/R Cormet C Stud at 600mm

centres between andscrew fixed to purlins

CS50/R Cormet C Studsat 600mm centres

Telescopic head – see details below

UT52/R Cormet U Track

UT62/RCormetU Track

LafargeIntumescentAcoustic Sealantat junctions

Single stud partition with onelayer of plasterboard –deflection head detail up to 60 minutes fire rated

Rockwoolinsulation withcloaking angle

Lafarge Firecheckpacker as specified

Studs andwallboards asspecified cutshort by up to40mm

Cormet MFIX orFlat StrapFS90/W forsingle boardedpartitions


Allowance fordeflection

Telescopic deflection head with fire umbrella

Cormet Flat Strap FS90/Ror FS90/W between layers

DeepFlangeU Track

MFC2330MetalAngle

Note on head packerMax deflection Packer required



15mm 1x19mm Plank


25mm 2x15mm Firecheck*Notes: * Firecheck can be substituted by Megadeco,

Toughcheck or MR Firecheck** Firecheck can be substituted by 25mm

Firecheck Coreboard



143

3

At profiled soffit (along profile)

Cormet MFIXacross profile

15mm LafargeFirecheckwallboard

Studs asspecified cutshort

Wallboardsas specified

Appropriateinsulation byothers

LafargeFirecheckrefer tonote onheadpacker

Cormet FlatStrap betweenlayers

Alternative details at profiled soffit (across profile)

Deflectionzone

Studs andwallboardas specified

Cormet Flatstrap


Insulationas specified

Deflection head details

Appropriateinsulation by others

Studs andwallboard as

specified

Lafarge Firecheckrefer to note on

head packer


Cormet Flatstrap

Junction with purlins at 1800mm centres

Deep FlangeU Track

Lafarge wallboardas specified

Timber fillet to suitangle of roof

Lafarge Firecheck referto note on head packer

Studs and wallboardcut short by requireddeflection

Partition perpendicular to purlins

Studs andwallboard cut

short to allow fordeflection

2x15mm LafargeFirecheck

wallboard



Purlinzone

Cormet U Trackto suit stud size


Deflection head under beam

UT52/R CormetU Track

MFC2330Cormet Anglefixed to steel

Outer layerLafarge Firecheck

wallboard

Inner layerLafarge dBcheck

wallboard

Cormet U Track Deep Flange


MFC2330Cormet Angle

CS50/RCormetC Studs

Insulation andwallboards as specified

LafargeFirecheckwallboard

150m

m

FS90/W Flat Strap orMFIX Fixing Channel

DeepFlange UTrack studassembly Cormet

C StudScrew fix withWafer Headscrews at 150mmcentres ( 300mmstitch pattern)

Metal Angle

MFC2330 Metal Angle

FS90/W Flat Strap orMFIX Fixing Channel


144



Floor details

Twin frame separating wall to concrete floorwith screed

Studs, wallboard andinsulation as specified

Cormet U Track asspecified


Screed on concretefloor

Separating wall with timber sole plate

Studs, wallboardand insulation asspecified


Floating screedon resilient layer

Timber sole platesame depth asscreed

Fire stop tocavity betweenfloor slabs

DPC

Expansion joint inscreed or fill cavitywith LafargeIntumescentAcoustic Sealant

Internal partition to concrete floor with screed



Lafarge Acoustic TapeRAFT50


Screed onconcrete floor

DPC

Partition with timber sole plate

Studs, wallboardand insulation as

specified



Timber soleplate same

depth as screed



145

3

Twin frame separating wall with floating screed


Cormet U Track asspecified fixed toconcrete slab


Twin frame separating wall with floating timber floor



Floatingtimberfloor

LafargeAcousticTape RAFT50pinned toend of floordeck

Internal partition on floating screed


Cormet U Track asspecified fixed to

screed



Internal partition on floating timber floor

Studs, wallboardand insulation as

specified



Floating timberdeck

Timber acousticbattens directlybelow partition

146



Baffle details

300min

300min

Varies

Baffle detail in twin stud wall:

elevation

C studs at 600mm centres

Metal switch/socket back boxes

Floor track

150 150Service outlets

If services are to be installed in highperformance partitions it is essentialto maintain the fire and acousticperformance of the partition system.

Service outlets should be offset sothat they do not lie back-to-back.Use Cormet Fixing Channel ornoggings to support outlets asnecessary, and seal around themwith Lafarge Intumescent AcousticSealant. To maintain fireperformance, form a baffle with15mm Lafarge Firecheck wallboardextending at least 300mm aboveand below the outlets and securedto noggings in the centre of thecavity.

A baffle box is required even wherethere is a box on one side only.

60 minute baffle in twin wall (section and plan)

120 minute baffle in twin wall (section and plan)

15mm Lafarge Firecheck wallboard taken down to floor level

Nogging to carry capping board Services box Wallboards as specified

Nogging to carry capping boards Services box Wallboards as specified

2x15mm Lafarge Firecheck wallboards taken down to floor level

Wallboards as specified



147

3

15mm LafargeFirecheck wallboardcap screw fixed to23x30mm CormetMetal Angles

(section)

15mm LafargeFirecheck wallboardbaffle screw fixed toCormet J Track beforeinserting betweenstuds

Service outlet

25mm rock mineralwool packing to void

Continuous baffle in twin wall

Service baffle in partition with 60 minutes fire rating (plan)

Service baffle in staggered I stud partition

Service baffle in Robust Detail E-WS-1 Alternative – service voidformed using Cormet Dryliner

Two layers ofwallboard as specified

C Studs at600mm centres

Edge Channel screw fixed at 300mmcentres through 15mm Firecheckcontinuous infill strip to C Stud

15mm Lafarge Firecheck wallboardbaffle screw fixed to J Track beforeinserting between studs

Serviceoutlet

Rock mineral woolpacking to void

150mm min


Continuous 15mm Lafarge Firecheckwallboard full height, full width

Glass mineral wool

`Plastic backboxes are allowed where baffleis continuous

Wallboardas specified

Rock mineral wool packing the void

15mm Lafarge Firecheck wallboard fixed toCormet Fixing Channel


CormetI Studs

Steelsocket box

Plywoodpacker

25mm glass mineral wool, density 16 kg/m2

2x12.5mm LafargeFirecheck wallboard

Cormet Metal AngleMFC2330


Cormet Drylinersystem used to

create services void

Baffle details

Metal Angle with short leg to void

148



Service and duct penetrations

Pipe penetration <50mm


Noggings top and bottomformed from Cormet U Track

Cable tray penetration through non fire ratedpartition (elevation and plan)

Outer extent of 15mmLafarge Firecheck patress -patress formed in two halves

Centre joint of patress andjunctions between patress andcable tray sealed with LafargeIntumescent Acoustic Sealant

Cable tray supportedfrom structure both sides

100mm minoverlap

150mm aroundpenetration

Cable tray

Insulation asspecified in partition

Cable tray penetration through fire ratedpartition (elevation and plan)




Cable tray supportedfrom structure both sides

100mm minoverlap


Cable tray

Void filled withrock mineral wool

Fire penetrations

Integrity of penetrations to be maintained by others.



149

3

Service and duct penetrations


Multiple pipe penetration through non fire ratedpartition (elevation and plan)



Pipes supported fromstructure both sides ofpartition

100mm minoverlap


Insulation asspecified in partition

Multiple pipe penetration through fire ratedpartition (elevation and plan)




100mm minoverlap



Pipes supported fromstructure both sides ofpartition

Duct penetration over 600mm wide through fire rated partition (section and plan)


Extra stud installed where M&E permits

100mm minoverlap



Outer extent of15mm Lafarge

Firecheck patress -patress formed in

two halves

Centre joint ofpatress and junctionsbetween patress and

cable tray sealed withLafarge Intumescent

Acoustic Sealant

Strips of board as required

Fire penetrations

Integrity ofpenetrations to be maintainedby others.

150



Dampers

Damper installation less than 500mm wide

15mm Lafarge Firecheck or15mm Megadeco wallboard

10mm gap caulked withLafarge IntumescentAcoustic Sealant

Rock mineral woolpacked around damper

Glass mineral wool

Cormet U Track

Cormet C Stud

Cormet U Track

Damper installation over 500mm wide

Cormet C Stud

Boxed stud inCormet UXT Track

Boxed CormetC Stud

600mm 600mm



Fire penetrations

Integrity of penetrations to be maintained by others.



151

3

Door frame details

Cormet C Stud as specifiedwith timber insert

Lafarge wallboard as specified

Door frame detail showing timber infill

Fire door frame

Cormet C Stud as specified


Door frame

Timber head to frame

Insulation as specified


Cormet C Stud as specified


Door frame

Timber head to frame


Notes:

At the head, Cormet U Track is cut and bentto extend 450mm down the face of thestuds and fixed twice to each side.

Head detail

Section AA

A

A

Base detail

A

A

150mm

Heavy duty fire door frame in single boarded partition

Boxed Cormet C Studs asspecified with full heighttimber insert or single ‘Y’gauge C stud with timberinsert


Fire door frame


Intumescent seal strip insert

Heavy duty fire door frame in double boarded partition


Fire door frame


Boxed Cormet C Studs asspecified with full heighttimber insert or single ‘Y’gauge C stud with timberinsert

Intumescent seal strip insert

75x50mm timber infill to90mm Cormet C Stud

152



Boxing and Splicing studs

Boxed studs

Cormet C Studs may be boxedtogether to give partitions ofgreater rigidity and height and toprovide support at doorways. Thebearing faces of the Cormet C Studsare asymmetrical (36mm and 34mm)to allow for boxing. Nest alternateshort and long faces and snaptogether.

To avoid bulging track leave 50mmboth ends as single stud.

Cormet C Studswith 600mmoverlap (Note: if thepartition layoutexceeds 4 metres,the overlapshould beincreased to1000mm)

Wafer Head screws at150mm centres on bothflanges

Splicedstuds

Boxedstuds

Column in party wall

2x15mm LafargeFirecheck wallboard


Lafarge AcousticTape RAFT50

Lafarge AcousticTape RAFT50

Structuralsteel column

25mm glass mineralwool, density 19.5 kg/m2



153

3

Movement joints

Movement Control Joint 30 minute fire rating

Movement Control Joint 60 minute fire rating

Two layers 15mm LafargeFirecheck wallboard

Cormet MovementControl Joint

15mm Lafarge Firecheckwallboard


Rock mineral wool tofill void

Cormet C StudCormet C Stud

Two layers 12.5mm LafargedBcheck wallboard

10mm

Table 3.20 Wall grades by categories of duty

BS 5234 : Part 2 : 1992Grade Category of duty Examples

LIGHT LD Adjacent space only accessible to DomesticDUTY persons with high incentive to accommodation

exercise care. Small chance ofaccident occurringor of misuse.

MEDIUM MD Adjacent space moderately used OfficeDUTY primarily by persons with some accommodation

incentive to exercise care. Somechance of accident occurringand of misuse.

HEAVY HD Adjacent space frequently used PublicDUTY by public and others with little circulation areas

incentive to exercise care.Chances of accident occurring Industrial areasand of misuse.

SEVERE SD Adjacent space intensively used MajorDUTY by public and others with little circulation areas

incentive to exercise care.Prone to vandalism and Heavy Industrial areasabnormally rough use.

12.5mm Lafarge dBcheckwallboard

15mm Lafarge Firecheckwallboard

Movement control joints forpartitions

Movement control joints may berequired to relieve normal structuralmovement without loading thepartition. Movement control jointsare required in partitions at intervalsnot exceeding 10 metres, where thepartition crosses or abuts astructural movement joint, andwhere partitions of dissimilarmaterials meet in the same plane.

At movement joints, leave a 12.5mmgap in the Cormet U Tracks at headand base. Fix a Cormet C Stud onone side, 10mm from the gap, andline the web with two layers of15mm Lafarge Firecheck wallboards.Place another stud, web facing webon the opposite side of the gap, asshown. Board the partition, leavinga continuous 12.5mm gap betweenboards along the line of themovement joint.

Cut Cormet Movement Control Jointto length; butt joint lengths end toend where necessary. Attach to theplasterboard surface with 13mmgalvanised or sherardized or zincelectro-plated staples at 150mmcentres. Apply Lafarge Fast Set intwo coats, feathering out the edgesof the second coat. After finishing,remove the masking strip from thecentre of the joint.

Wind loading

Cormet Metal Stud Partitions arenon-loadbearing but can accept adegree of wind loading, for examplewhen used in buildings with large ormultiple external doors. Informationcan be provided on specifications tosuit individual requirements,including the provision of deflectionheads. As a guide, a 7.6m highpartition consisting of 146mmCormet C Studs with two layers of12.5mm Lafarge dBcheck wallboardresists a pressure of 200N/m2, with adeflection limit of L/240 (where L isthe partition height in mm)

Electrical services

The installation of electrical servicesshould be carried out in accordancewith the recommendations of theInstitution of Electrical Engineers.The cut-outs in the studs can beused for routing electrical and othersmall services. Cables should beprotected by conduit or othersuitable precautions taken toprevent abrasion when they passthrough the metal frame.

Earth Bonding

The electrical installation should becarried out in accordance with theI.E.E. Wiring Regulations and theadvice of the National InspectionCouncil for Electrical InstallationContracting (NICEIC) should besought.

154



Minimum 300mm straightsection with Cormet C Studsat 150mm centres at eachend of curve

Cormet Flex Track formedas shown opposite(ceiling track similarly)

Inner layer of plasterboardfixed to each stud at

150mm centres

Outer layer ofplasterboard applied

with long edgeshorizontal, fixed to

each stud at 150mmcentres

Curved partitionCurved Metal StudPartitionsThe versatility and strength ofCormet C Studs enables curvedpartitions to be easily constructed,to create flowing surfaces thatoffset flat wall areas.

To achieve smooth curves, studs areused at close centres, and theplasterboard is wetted beforeapplication with long edgeshorizontal.

Curving plasterboard

Most plasterboards can be curvedwhen wetted. Lafarge Contourwallboard however can be curved tosimilar radii when dry by fixing thewallboard directly to the supportingframe. Curves of a tighter radius canbe obtained by using LafargeContour wallboard in a wettedform. Lafarge Contour wallboardcan be curved in either direction andto a minimum radius of 600mm. See table 3.21.

Curved partitions

FS90/W Flat Strap to supportjoints in layer of wallboard



155

3

Table 3.22 Cormet Flex TrackLafarge Metal Dimensions LengthCode Thickness (mm) (mm) (mm)

MFLEX 0.7 30 x 23 3000

Table 3.21 Bending radii and stud centresRadius Stud centres (mm)(mm) 6mm Contour 9.5mm 12.5mm 15.0mm

wallboard plasterboard plasterboard plasterboard

600 –900 150w – – –

900 –1000 200d 150w – –

1000 –1500 200d 200w 150w –

1500 –2000 200d 250w 200w –

2000 –2500 200d 300w 200w 150w

2500 –3000 250d 350w 300w 200w

3000 –4000 300d 450w 400w 200w

4000 + 300d 450w 500w 350w

w = wetted

d = dry

Pre-cut at 50mm centres to allow curves ofminimum radius of 600mm

Flex Track

Board wetting

Thoroughly wet the side to becompressed of each plasterboardsheet using a brush or roller. Do notwet the opposite side. Allow theboards to stand for at least onehour before installation.

When bending to a tight radiusensure that the wetting processsoftens the core of the wallboard.

System assembly

Cormet Flex Track

Cormet Flex Track is designed toallow easy construction of curvedwalls, partitions and ceilings.

It is a galvanised 0.7mm metal angleused in place of standard metalangle or standard Cormet U Track. It is supplied pre-cut to allow aminimum radius of 600mm to beachieved.

Metal stud framing

Mark out the curves on the floorand ceiling. Curve width should be2mm greater than the width of theCormet C Stud.

Fix the Flex Track to the floor andceiling at 300mm centres along bothlines of the marked curve.

Insert Cormet C Studs into the trackaround the curve at centres shownin table 3.21. Where multiple boardlayers are installed, it may benecessary to insert extra studs at theboard edges to account for thedifference which arises between theinner and outer board radii.

Boarding

Start boarding at one end. Buttplasterboards firmly against theceiling. Screw fix the first stud,fixing from the midpoint of theboard, at 150mm centres, asillustrated. Refer to table 3.25 forrecommended screw lengths.Carefully screw the board to theframing, stud by stud, pushing theboard against the framing.

Ensure that the plasterboards arecompletely dry before jointing andmaking cut-outs for services.

On double layer boarding systems,the horizontal joint of the outerlayer of wallboard may besupported by the use of FS50/R orFS90/W Cormet Flat Strap fixedbetween wallboard layers ifrequired.

Jointing

Stagger all joints between layers. All joints should be taped and filledin accordance with LafargePlasterboard’s instructions. SeeSection 7.

156



Fixing to Lafarge wallboards

Drywall constructions canaccommodate most fixturesproviding the appropriate fixings or fixing provisions are used.

Where the locations of fixtures areknown before the construction iscommenced, fixing provisions can be designed and installed into theconstruction.

Alternatively, fixtures can beattached directly to the finished drylinings using the recommendedfixings given in table 3.23.

For the medium and heavyweightfixings in table 3.23 it is veryimportant that the plasterboard iscarefully and accurately drilled andthat all fixings are installed as perthe manufacturer’s instructions.Holes should never be punched. On the bigger fixtures, it is necessaryto use a minimum of four fixings.

Table 3.23 FixturesFixture load Examples Fixing provisions* Notes

Very light Small pictures Picture hooks

Wood screws

Light Mirrors Spit Driva LD See manufacturer’s

Floor cupboards Spit Driva original literature for

Light fittings Spit Diva PlusMaximum loadings

Coat hooks Fixing channel

Medium Radiators Spit Spring Toggle See manufacturer’s

Wall cupboards Spit Hollow Anchor literature for

Water heaters Spit SatelisMaximum loadings

Sanitary ware Fixing Channel

Timber battens

Boxed studs

Extra studs

Heavy Wall mounted sanitary ware See diagrams on opposite page

Large wall cupboards

Heavy shelving

* See manufacturer’s literature for maximum loadings

Spit Driva LD

Spit Driva Original

Spit Spring Toggle

Fixtures

Spit Driva Plus

Spit Hollow Wall Anchor

Spit Satelis



157

3

Foe medium weight items

Lafarge Fixing Channel or FS90/WFlat Strap secured to studs withwafer head screws

For heavy weight items

Timber support

Vertical timber framingas required

Floor channel

300mm length ofCormet stud screwfixed back to back tomain stud with LafargeSelf-Tapping Screws

Horizontal nogging and centralstud of sawn softwood to suit sizeof Cormet metal studs and notchedinto them and fixed through ends

Plywood support

18mm plywood600x300mm

CormetMetalAngle

Rebate onplywood

Plywood patress


60mm U-track to secureback of plywood

Drywalladhesive dabs

Drywall screws 100mmfrom stud centres

600mm

158



Tips on installation

Board fixingFor fixing to timber, use nails orscrews as specified in tables 8.4 or8.9. For fixing to metal, use screwsas specified in table 8.5.

Lafarge Drywall Screws

Bugle head screws for fixingplasterboard to metal or timberstuds. Lafarge Drywall Screws havea unique head design to eliminatepaper burrs and provide a flushfinish. Extra-sharp points and high-grip threads result in fastpenetration through theplasterboard and stud. The screwsare black phosphate coated andlightly oiled for protection againstcorrosion.

Lafarge Drywall High Thread Screwsare used for attaching plasterboardto timber framework.

Lafarge Drywall Self Tapping Screwsare for light gauge metal up to0.7mm thick.

Lafarge Drywall Self Drilling Screwsare for heavy gauge metal from0.7mm to approximately 2.0mm thick.

Installation

Drive Screws:

• at least 10mm in from paper-bound edges of plasterboard

• at least 13mm in from cut edgesof plasterboard

• at least 6mm in from edges oftimber framing

• at least 3mm in from the edges of metal framing.

Screw spacing: Partitions, maximum300mm. Ceilings, maximum 230mmin the field of the plasterboard,150mm at cut edges and perimeter.Linings, maximum 300mm.


thickness (mm) (mm)


15.0 40

19.0 50


12.5 + 19.0 65

15.0 + 15.0 65

Drive screws squarely through boardand into framing until screw head isjust recessed. Spot screw heads withLafarge jointing compound toprovide a flush surface.

Lafarge Pan Head Screws andLafarge Wafer Head Screws are usedprimarily for fixing Cormet metalstuds and other Cormet metalframing components together: self-tapping for light gauge metal andself-drilling for heavy gauge metal.

Lafarge Toughcheck Screws are usedfor fixing Lafarge Toughcheckwallboard.

Table 8.4 Recommended screwlengths*Construction Plasterboard Screw


Timber framing 6 32


15.0 38

19.0 41

Timber framing 6 + 6 38


12.5 + 19.0 63

15.0 + 15.0 63

Metal framing 6 25


15.0 32

19.0 38

25.0 41

Metal framing 6 + 6 25

12.5 + 12.5 38

15.0 + 15.0 44

12.5 + 19.0 51

25.0 + 12.5 57

25.0 + 25.0 63

* Except for fixing to Cormet metal furring wall channelsand Resilient Bar. See table 4.16 on page 184.

Lafarge Checkpoint Screws are usedfor fixing Lafarge Moisturecheck,dBcheck and Firecheck wallboards to 0.5mm light gauge Cormet metalstuds.

Lafarge Drywall Nails

Zinc-coated ring shanked DrywallNails with a thin wide head formaximum board holding withoutpaper breakage. The long, sharpdiamond point ensures ease offixing. Complies with BS 8212: 1995for fixing plasterboard to timber.

Installation

Drive nails:



• at least 6mm in from edges oftimber framing.

Nail spacing: maximum 150mm (all systems).

Drive nails squarely throughplasterboard and into timber framingusing a dimple head drywall hammeruntil the nail head is just recessed.Spot nail heads with Lafargejointing compound to provide a flushsurface.

3 10 310

Up to 3mmgap betweenplasterboards

Fixing position at bound edgesof boards

3 13 310

Fixing positions at bound edge/cutedge joint

3 13 313

Fixing positions at cut edges ofboards

Minimum3mm fromedge ofmetalframe

Minimum 10mmfrom edge ofwallboard









159

3

Tiling

Tiling is suitable for a wide range ofapplications with varying conditions,ranging from domestic splashbacksto shower cubicles in publicbuildings.

Ceramic tiling should be applied toLafarge Standard wallboard orLafarge Moisturecheck wallboarddepending on the severity of theconditions. Lafarge Standardwallboard may be used as the basefor tiling in areas such assplashbacks behind kitchen sinks andwash hand basins. In other areaswhere there is likely to be moresplashing of water on the surface,e.g. showers, it is preferable to useLafarge Moisturecheck wallboard. IfLafarge Standard wallboard is usedit should be treated on the facewith two coats of Lafarge DrywallSealer.

Where the tiling is to cover theentire drylined wall surface, squareedge boards may be used. Where anarea of the drylining will remainuntiled, taper edge boards shouldbe used so that flush joints can beformed in the exposed areas; in thiscase the concealed joints should befilled with a waterproof ceramic tileadhesive.

Care should be taken to ensure thatthe framing members and liningboards offer adequate support toprevent flexing, particularly forpartitions which may be tiled on oneside only. Tiled areas not extendingdown to the floor should beprovided with horizontal supports atthe base of the tiling.

Additional support requirements aregiven in table 3.26. Supports forbaths, basins and other plumbingfixtures must be providedindependently of the plasterboard.

It is essential that detailing atjunctions, angles and perimeters isdesigned to prevent moisturepenetration. Seal around pipes,baths, shower fittings, openings andoutlets with a waterproof siliconesealant.

Recommendations in table 3.26apply to the use of tiles up to12.5mm thick with a maximumweight of 32 kg/m2, fixed inaccordance with BS 6431: Part 9,using a thin-bed adhesive (nominalthickness 3mm).**

Drylining systems using LafargeBonding Compound in theirconstruction should be allowed 10days to achieve their full strengthbefore tiling.

Repairs

Minor damage to plasterboard maybe repaired by filling with LafargeFast Set and sanding smooth. Areasof damage too large for fillingshould be repaired by one of themethods below.

Cut out a rectangular piece of theboarding around the damaged areausing a fine-toothed keyhole saw.Bevel the edges of the hole inwardsat 45º with a rasp or sanding block.Cut a piece of board to the samesize as the hole and bevel the edgesto an exact fit. Apply Lafarge FastSet to the edges of the hole and fitthe patch piece in place using

Lafarge Patching Tape; leave to setfor 1 hour. Finish around the patchas described under Jointing above.

If necessary, bond a strip ofplasterboard behind the hole toprovide extra support beforeinserting the patch piece.

For larger repairs, cut a rectangularpiece of plasterboard 50mm largerthan the hole or damaged area.Place it over the hole and mark itsposition. Cut through the damagedboard along the diagonals of themarked rectangle with a fine-toothed keyhole saw; then cutthrough the paper facing aroundthe rectangle with a sharp knife,break away and remove the cutpieces of the board.

Cut two backing pieces ofplasterboard and bond to the backof the boarding using Lafarge FastSet on each side of the hole; allowto harden for 1 hour.

Apply Lafarge Fast Set to thebacking pieces and fit the patchpiece of plasterboard into the holeusing Lafarge Patching Tape; leaveto set for 1 hour. Finish around thepatch as described under Jointingabove.

Table 3.26 Plasterboard to receive ceramic tiling (BS 8212)System Board Support Additional support Maximum

thickness centres tiling height(mm) (mm) (m)

Drylining Direct Bond 12.5 450* Horizontal dabs at 1/3 centres in height 3.6

Lafarge Dryliner 12.5 400 – 3.6

Independent 70mm I Studs 2 x 12.5 400 Mid-point support 3.0

Partitions Laminated 50, 63 – None 2.4

55, 70 – None 2.6

Timber 12.5 400 – 450 None 3.0

12.5 600 Timber noggings at 600mm vertical centres 2.4

Cormet metal stud 50mm studs 2 x 12.5 400 None 3.6

70mm studs 2 x 12.5 400 None 3.6

146mm studs 2 x 12.5 600 Additional studs at 300mm centres up to tile height

*Bonding compound dab row centres

**Full specification for ceramic tiling to plasterboard is available from the Tile Association, Forum Court, 83 Copers Road, Beckenham, Kent, BR3 1NR

Tiling onto LafargeWallboard

160

P A R T I T I O N SWHAT CAN GO WRONG CHECKLIST


Partitions Checklist

Items to check

1. Has sealant been applied to the back of the steel U channels or timberframing before fixing to the wall floor and ceiling?This sealant has the vital role of filling any gaps due to the undulations in thestructure and thus preventing unwanted airpaths.

2. Is the mineral wool the correct thickness and density?

Inadequate thickness and density will reduce the acoustic performance.

3. Is the mineral wool quilt installed with no gaps at the joints and butted uptightly at the perimeter?

Gaps will allow the sound to travel right through rather than being partiallyabsorbed as it passes through the mineral wool.

4. Where Cormet Resilient Bars are used do the wallboard screws come intocontact with the main studs?

To check this, the side of the partition with the Resilient Bar must be boarded outfirst, so a visual check can be made before the other side is boarded out.

5. Are all joints in double boarded applications staggered?

Plan the board layout to avoid both layers of board having a vertical joint at thesame stud.

6. Is the gap at the base of the wallboard filled with Lafarge AcousticSealant?

If left unfilled this will be a weak point for the sound to pass through.

7. Has the correct type of wallboard been used?

The wrong type of wallboard may adversely affect performance. Lafarge wallboardsare colour coded to make it easier for the correct board to be identified.

8. Have electrical sockets and other services been installed correctly?

Wallboard baffles must be built behind the electrical boxes to maintain the soundperformance of the partition.


(✓) (✓)

FLOORS AND CEILINGS 4

162

F L O O R S A N D C E I L I N G SINTRODUCTION


ContentsPerformance Tables 163

Lafarge plasterboard direct to timber ceilings 179

Cormet Dryliner to timber joist floors 187

Cormet Dryliner to concretefloors 193

Cormet SuspendedMetal Frame ceilings 197

Cormet Acoustic Floor 207

Robust Details 215

Timber Joist Floors andInsulated RoofsPlasterboard ceilings on timberframing are typically for domesticapplications, the plasterboardsbeing attached directly to theunderside of floor joists, the bottomchords of the roof trusses or rafters.They allow upgrading of a basicceiling construction, whether new orexisting, to provide fire resistance asrequired.

Cormet Dryliner CeilingsCormet Dryliner is a metal frameceiling system fixed directly totimber joists or concrete soffits toprovide high levels of fire protectionor sound reduction. It is particularlysuitable for use on uneven timberjoists to provide a flat ceilingsurface, and to provide a cavity forthe accommodation of services.

Cormet Suspended CeilingsCormet Suspended Ceilings aretypically for commercialapplications. Ceiling voids may bevaried to accommodate services,ducting etc. They can provide a highperformance ceiling with soundinsulation and fire protection,andcan be used to upgrade and protectexisting structures.

Cormet Acoustic FloorCormet Acoustic Floor is a soundinsulating floor system for use ontimber joisted floors. The system haswide applications for new build,conversion and improvement work.It is particularly suitable forupgrading existing timber joistfloors to separating floors.

System selection

Selection criteria:

Ceiling void mm joist depth up to 130 any joist depth 41

Fire Resistance* minutes 30 – 120 30 – 120 30 – 120 60 60

Sound Resistance airborne dB 36 – 61 42 – 56 43 – 62 53 – 63 61 – 63

Sound Resistance impact dB 83 – 54 72 – 60 72 – 57 65 – 54 57 – 53

Weight kg/m2 30 – 71 11 – 49 13 – 308 60 –

U-value W/m2K 0.16 – 0.30 – – – –


Residential: New Housing■ – – – ■

Flats■ ■ ■ ■ ■

Renovation■ ■ ■ ■ –

Commercial: Offices – ■ ■ – –Entertainment – ■ ■ – –

Institutional – ■ ■ ■ –Shops – ■ ■ – –

Industrial: Factories■ ■ ■ – ■

Warehouses■ ■ ■ – ■

Specials: Cinemas – ■ ■ – –Hospitals – ■ ■ – –

Tim

ber

jois

ted

floo

r

and

ceili

ng

Corm

et d

rylin

er

ceili

ng

Corm

et s

uspe

nded

ceili

ng

Corm

et a

cous

tic

floo

r

*Some selection criteria figures cannot be given, as they are partlydetermined by their background. For higher values contact our TechnicalEnquiryline 01275 377789.

Stee

l joi

sts


F L O O R S A N D C E I L I N G SDIRECT TO TIMBER

163

4

Performance tables

Table 4.1 Floors with engineered joists


REJ 023 Flooring: 22mm tongued and grooved chipboard

Joists: 240mm minimum timber I-Joists at 600mm centres

Ceiling: one layer 12.5mm Lafarge dBcheck wallboardon Cormet Resilient Bars (RBD3000) at maximum 450mmcentres

29 30 30 47 74



Ceiling: one layer 15mm Lafarge Standard or Predecowallboard

27 30 0 40 83



Ceiling: one layer 12.5mm Lafarge Echeck wallboard onCormet Resilient Bars (RBD3000) at maximum 450mmcentres

29 30 30 42 76




Ceiling: one layer 12.5mm Lafarge Echeck wallboard

31 30 30 40 80




Ceiling: one layer 15mm Lafarge Standard or Predecowallboard

31 30 30 43 75



Ceiling: one layer 15mm Lafarge Firecheck wallboard

30 30 30 41 80


The Deco system is not suitable for plastering. Refer to Section 7 for finishing details.

Note: Rock mineral wool density 40 kg/m3 may be used in lieu of glass mineral wool as specified.

Flooring: Tongued and grooved sheets of chipboardwhich must be glued and screw fixed to theengineered joists

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

164



Performance tables

Flooring: 18mm tongued and grooved chipboard

Joists: 47 x 200mm at 400mm centres without noggings

Ceiling: one layer 15mm Lafarge Standard wallboard orPredeco wallboard

RTC 52 37 30 30 38 77

Table 4.2Ceilings under timber floor


RTC 61 Flooring: 22mm tongued and grooved chipboard

Joists: 47 x 200mm at 450mm centres

Ceiling: one layer 15mm Lafarge Standard wallboard orPredeco wallboard on Cormet Resilient Bars (RBD3000) atmaximum 450mm centres




Ceiling: one layer 12.5mm Lafarge Echeck wallboard onCormet Resilient Bars (RBD3000) at maximum 450mmcentres

RTC 17

43 30 30 40 76

38 30 30 52 69




.



Ceiling: one layer 12.5mm Lafarge Standard wallboardor Predeco wallboard

RTC 12 35 30 0 38 78




Ceiling: one layer 12.5mm Lafarge Standard wallboardor Predeco wallboard

RTC 065 38 30 0 40 75

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)



165

4

Performance tables

Table 4.2 (continued)Ceilings under timber floor





Ceiling: inner layer 12.5mm Lafarge Standard wallboard,outer layer 12.5mm Lafarge Standard wallboard orPredeco wallboard

RTC 04 48 30 30 42 75



Ceiling: inner layer 12.5mm Lafarge Standard wallboard,outer layer 12.5mm Lafarge Standard wallboard orPredeco wallboard

RTC 03 48 30 30 40 78




supported on noggings

Ceiling: one layer 12.5mm Lafarge Echeck wallboard



Ceiling: one layer 12.5mm Lafarge Firecheck wallboardor Megadeco wallboard

38 30 30 44 75

34 30 30 41 77



Ceiling: one layer 15mm Lafarge Firecheck wallboard orMegadeco wallboard fixed with 63mm Lafarge DrywallHigh Thread Screws

37 60 60 41 76



Ceiling: inner layer 15mm Lafarge Standard wallboard,outer layer 15mm Lafarge Standard wallboard or Predecowallboard

50 60 30 43 72




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

166



Performance tables

Table 4.2 (continued)Ceilings under timber floor


Below 22mm timber floor (continued)

RTC 20



Ceiling: two layers 12.5mm Lafarge Echeck wallboard

Ceiling: existing lath and plaster supported with chickenwire fixed to joists, cross battened with 50 x 50mmsoftwood battens at 400mm centres to receive one layer15mm Lafarge Firecheck wallboard or Megadecowallboard fixed with 63mm Drywall High Thread Screws

52 30 30 44 75

55 60 60 48 70

RTC 14

Ceiling: existing lath and plaster supported with chickenwire fixed to joists, cross battened with 50 x 50mmsoftwood battens at 400mm centres to receive one layer 12.5mm Lafarge Standard wallboard orPredeco wallboard

54 30 30 47 71RTC 29

RTC 51 Joists: 47 x 200mm at 450mm centres

Insulation: 100mm rock mineral wool roll batt density 23 kg/m3

Ceiling: two layers 15mm Lafarge dBcheck wallboard onCormet Resilient Bar (RBD3000) at maximum 450mmcentres

RTC 23 Joists: 47 x 200mm at 600mm centres with noggings

Ceiling: inner layer 15mm Lafarge Firecheck wallboard,outer layer 15mm Lafarge Firecheck wallboard orMegadeco wallboard. Inner layer secured with 50mmDrywall High Thread Screws, outer layer secured with75mm Drywall High Thread Screws

55 60 60 55 62

50 120 90 45 70




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)



167

4

Performance tables

Table 4.3Ceilings to garages below habitable rooms


RTC 77

Floor: 22mm chipboard on 500 gauge polythene



Ceiling: one layer 12.5mm Lafarge FirecheckMoisturecheck wallboard

Floor: 22mm chipboard on 500 gauge polythene



Ceiling: two layers 12.5mm Lafarge FirecheckMoisturecheck wallboard

RTC 76 38 30 30 44 75 0.35

48 60 60 46 75 0.35

U-v

alue

(W

/m2 K

)



.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

168



Performance tables

Table 4.4Separating floors - timber


RTC 49

Floating floor: 18mm tongued-and-grooved chipboard spotbonded with Lafarge Drywall Adhesive to 19mm LafargePlank on minimum 25mm rock mineral wool (120 kg/m3) on 12mm plywood/oriented strand board



Ceiling: inner layer 19mm Lafarge Plank, outer layer12.5mm Lafarge Echeck on Cormet Resilient Bars(RBD3000) at maximum 450mm centres

Floating floor: 18mm tongued-and-grooved chipboard spotbonded with Lafarge Drywall Adhesive to 19mm LafargePlank on minimum 25mm glass mineral wool (75 kg/m3) on 12mm plywood/oriented strand board



Ceiling: two layers 15mm Lafarge dBcheck wallboard onCormet MF Suspended Ceiling at maximum 450mm centres

70 60 60 61 54

-11 Ctr

71 60 60 60 55

-9 Ctr

RTC 25

E-FT-1(Robust Detail)

Floating floor: 18mm tongue-and-groove floorboardson 15mm Lafarge dBcheck wallboard on resilientcomposite timber battens, with 13mm minimum rockwool quilt density 33-36 kg/m3 laid between battens

Structural floor: 240mm minimum timber I-Joistsoverlaid with 15mm minimum decking

Insulation: 100mm minimum glass mineral wool quiltdensity 10-33 kg/m3 between joists

Ceiling: two layers 15mm Lafarge Firecheck wallboard(minimum weight 25 kg/m2) on Cormet Resilient Bars(RBD3000) at maximum 450mm centres

72 60 60 Robust RobustDetail Detail

Solution Solution

RTC 50 Floating floor: 18mm tongued-and-grooved chipboardspot bonded with Lafarge Drywall Adhesive to 15mmLafarge dBcheck wallboard on minimum 25mm rockmineral wool (120kg/m3) on 12mm plywood/orientedstrand board



Ceiling: two layers 15mm Lafarge dBcheck wallboard onCormet Resilient Bars (RBD3000) at maximum 450mmcentres

71 60 60 60 55

-9 Ctr



.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)



169

4

Performance tables

Table 4.5 Separating floors - steel


RSF 02

RSF 03

Floating floor: 18mm Caberfloor P5 on 15mm LafargedBcheck wallboard on 30mm 120 kg/m3 Rockwool slabon 11mm OSB 3 Sterling Board T & G flooring.

Joists: 150mm structural steel joists 1.5mm thick at400mm centres.


Ceiling: two layers 15mm Lafarge dBcheck wallboard onCormet Resilient Bars (RBD3000) at maximum 450mmcentres.

Floating floor: 40mm Lafarge Gyvlon screed on 6mmEthafoam on 20mm OSB 3 Sterling Board.

Joists: 200mm structural steel joists 2mm thick at600mm centres.


in joist cavity.

Ceiling: two layers 15mm Lafarge dBcheck wallboard onCormet Resilient Bars (RBD3000) at maximum 450mmcentres.

44 60 60 65 53

-12 Ctr

112 60 60 61 57

-7 Ctr

Table 4.6Refurbishment as Approved Document E 4-3


Floor: 18mm tongued and grooved chipboard

Existing ceiling: existing lath and plaster plus 15mmLafarge Firecheck wallboard


New ceiling: two layers 12.5mm Lafarge dBcheckwallboard on Cormet MF Suspended Ceiling systemsupported on MFC Strap Hanger at 900mm centres fixedto bent MFCP44 Channel to create minimum 125mm void

RCC 15 (modified) 80 60 60 _ _



.



.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

170



Performance tables

Table 4.7Ceilings under roof trusses (cavity loft space, nodecking, no loading to trusses)


Trusses: 47 x 100mm at 600mm centres with noggings

Insulation: one layer of 100mm glass mineral wool quiltinfilled between joists, one layer 150mm glass mineral woolquilt across joists, density 10.5 kg/m3

Ceiling: one layer 12.5mm Lafarge Firecheck wallboard orMegadeco wallboard fixed with 38mm Lafarge DrywallHigh Thread Screws at 150mm centres

RTC 31



Ceiling: inner layer 12.5mm Lafarge Firecheck wallboard,outer layer 12.5mm Lafarge Firecheck wallboard orMegadeco wallboard, inner layer fixed with 38mm LafargeDrywall High Thread Screws at 300mm centres, outer layerfixed with 63mm Lafarge Drywall High Thread Screws at150mm centres

RTC 32

11 30 30 0.15

12 60 30 0.15




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Wei

ght

(kg/

m2 )

Uva

lue



171

4

Performance tables

Table 4.7 (ctd)Ceilings under roof trusses (cavity loft space, nodecking, no loading to trusses)


RTC 34



Ceiling: one layer 12.5mm Lafarge Firecheck wallboard orMegadeco wallboard fixed with 38mm Lafarge DrywallHigh Thread Screws at 150mm centres



Ceiling: inner layer 15mm Lafarge Firecheck wallboard,outer layer 15mm Lafarge Firecheck wallboard orMegadeco wallboard, inner layer fixed with 38mm LafargeDrywall High Thread Screws at 150mm centres, outer layerfixed with 63mm Lafarge Drywall High Thread Screws at150mm centres

11 30 30 0.15

26 60 60 0.15

RTC 33




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Wei

ght

(kg/

m2 )

Uva

lue

172



Performance tables

RDC 16

RDC 17

RDC 18

Ceiling: one layer 12.5mm LafargeStandard wallboard or Predeco wallboardon Cormet Dryliner Channel RD1 at450mm maximum centres

Insulation: 100mm glass mineral wooldensity 10.5 kg/m3

Ceiling: inner layer 12.5mm LafargeStandard wallboard, outer layer 12.5mmLafarge Standard wallboard or Predecowallboard on Cormet Dryliner ChannelRD1 at 450mm maximum centres


Ceiling: one layer 12.5mm LafargeFirecheck wallboard or Megadecowallboard on Cormet Dryliner ChannelRD1 at 450mm maximum centres

RDC 19 Insulation: 50mm glass mineral wooldensity 24 kg/m3

Ceiling: inner layer 12.5mm LafargeFirecheck wallboard, outer layer 12.5mmLafarge Firecheck wallboard or Megadecowallboard on Cormet Dryliner ChannelRD1 at 450mm maximum centres

Table 4.9Cormet Dryliner ceilings to concrete floor slabs

11 0

13 30

22 30

23 60

System reference Any concrete soffit




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es



173

4

Performance tables

Table 4.10Cormet M.F. Suspended Ceiling to timber joist floor

System reference

Flooring: tongued-and-grooved boarding or sheets of tongued-and-grooved orientedstrand board or wood chipboard not less than 18mm finished thickness

RCC 11

RCC 12

RCC 13


Ceiling: one layer 12.5mm Lafarge Echeck wallboard onCormet Ceiling Channels at 450mm maximum centres

Joists: 47 x 200mm at 600mm


Ceiling: two layers 12.5mm Lafarge Echeck wallboard onCormet Ceiling Channels at 450mm maximum centres

Joists: 47 x 200mm at 600mm

Ceiling: one layer 12.5mm Lafarge Firecheck wallboardor Megadeco wallboard on Cormet Ceiling Channels at450mm maximum centres

33 30 30 43 72

42 60 60 46 69

34 60 30 44 70

RCC 41 Joists: 47 x 200mm at 600mm centres

Ceiling: one layer 12.5mm Lafarge Standard wallboardor Predeco on Cormet Ceiling Channels at 450mmmaximum centres

32 0 0 40 74

RCC 42 Joists: 47 x 200mm at 600mm


Ceiling: two layers 12.5mm Lafarge Standard wallboardor Predeco as the outer layer on Cormet Ceiling Channelsat 450mm maximum centres

40 60 30 44 72




Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

Table 4.10 (continued)Cormet M.F. Suspended Ceiling to timber joist floor

System reference


174



Performance tables

RCC 14

RCC 15



Ceiling: inner layer 12.5mm Lafarge Firecheck wallboard,outer layer 12.5mm Lafarge Firecheck or Megadecowallboard on Cormet Ceiling Channels at 450mmmaximum centres



Ceiling: inner layer 15mm Lafarge Firecheck wallboard,outer layer 15mm Lafarge Firecheck or Megadecowallboard on Cormet Ceiling Channels at 450mmmaximum centres

45 90 60 54 62

50 120 90 56 60




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)



175

4

Performance tables

Table 4.11Cormet M.F. Suspended Ceilings to any soffit,giving a fire rating to the ceiling void


RCC 16

RCC 17

RCC 18

Ceiling: one layer 12.5mm Lafarge Standard wallboardor Predeco wallboard on Cormet Ceiling Channels at450mm max centres


Ceiling: inner layer 12.5mm Lafarge Standard wallboard,outer layer 12.5mm Lafarge Standard wallboard orPredeco wallboard on Cormet Ceiling Channels at 450mmmax centres


Ceiling: one layer 12.5mm Lafarge Firecheck wallboardor Megadeco wallboard on Cormet Ceiling Channels at450mm max centres

RCC 19 Insulation: 50mm glass mineral wool density 24 kg/m3

Ceiling: inner layer 12.5mm Lafarge Firecheck wallboard,outer layer 12.5mm Lafarge Firecheck wallboard orMegadeco wallboard on Cormet Ceiling Channels at450mm maximum centres

11 0 0 0

22 n/a 30 30

26 n/a 60 30

13 n/a 30 30

RCC 28 Insulation: 50mm glass mineral wool density 24 kg/m3

Ceiling: one layer 15mm Lafarge Firecheck wallboard orMegadeco wallboard on Cormet Ceiling Channels at450mm max centres

15 30 60 30




.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

BS47

6-pa

rt23

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

2:19

99,

min

utes

176



Performance tables

Table 4.12Cormet Mass Barrier ceiling


RCC 60

RCC 61


Ceiling: two layers 12.5mm Lafarge dBcheck wallboardon Cormet Ceiling Channels at maximum 400mm centresand Cormet Heavy Duty Primary Channels (UT52/Y) at1200mm centres suspended from Phonissimo AcousticHangers at 1200mm centres


Ceiling: three layers 15mm Lafarge dBcheck wallboardon Cormet Ceiling Channels at maximum 400mm centresand Cormet Heavy Duty Primary Channels (UT52/Y) at1200mm centres suspended from Phonistar ResilientHangers at 1200mm centres

30 n/a 60 60

46 n/a 90 90



.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt22

:198

7, m

inut

es

Fire

Per

form

ance

BS47

6-pa

rt23

:198

7, m

inut

es

Fire

Per

form

ance

EN

1364

-

2:19

99,

min

utes



177

4

Performance tables

Table 4.13Cormet Acoustic Floor

System reference


RAF 06

RAF 50

Floor: Cormet Acoustic Floor system with 19mm plankand an additional layer of 15mm Lafarge Firecheckwallboard inserted inside the cavity to form a bridge and to protect sides of joist


Insulation: 100mm glass mineral wool density 10.5kg/m3

Ceiling: existing lath and plaster

Floor: Cormet Acoustic Floor system using 22mmtongue-and-groove chipboard plus single layer 15mmLafarge dBcheck wallboard


Insulation: 100mm glass mineral wool density10.5kg/m3

Ceiling: two layers 15mm Lafarge dBcheck wallboard on Cormet Resilient Bar (RBD3000) at maximum 450mmcentres

Note: In this system, when using 15mm Lafarge dBcheckbelow chipboard flooring, 57mm trim head screws should be used to fix flooring through wallboard to metal angle

60 60 60 53 65

60 60 60 63 54

-10 Ctr



.

Wei

ght

(kg/

m2 )

Fire

Per

form

ance

BS47

6-pa

rt21

:198

7, m

inut

es

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Fire

Per

form

ance

EN

1365

-

2:19

99,

min

utes

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

178



Performance tables

Aco

usti

c in

sula

tion

inde

x (R

wdB

) (C

tr if

appl

icab

le)

Impa

ct S

ound

insu

lati

on

(Lnw

dB)

Table 4.14Separating floors - concrete


E-FC-1 Floating floor: 18mm tongue-and-groove floorboardson resilient composite timber battens (type FFT1)

Screed: 40mm sand:cement or Lafarge Gyvlon screed(minimum weight 80 kg/m2)

Structural floor: 150mm minimum precast concreteplanks (minimum weight 300 kg/m2)

Applicable ceilings

(CT1) Metal ceiling system: Cormet Dryliner or CormetMF Ceiling system providing 100mm (min) ceiling void withone layer 12.5mm Lafarge Standard wallboard

(CT2) Timber battens and counter battens: 50 x 50mmsoftwood battens with 50 x 50mm counter battens belowand one layer 12.5mm Lafarge Standard wallboard

(CT3) Metal ceiling system: Cormet Dryliner SR or MFCeiling system providing 75mm (min) ceiling void with onelayer 12.5mm Lafarge Echeck wallboard

(CT4) Timber battens and resilient bar: 50 x 50mmsoftwood with Cormet Resilient bars RBD3000 mounted atright angles to softwood battens at max 450mm centresand one layer 12.5mm Lafarge Echeck wallboard

Robust RobustDetail Detail

Solution Solution

E-FC-2 Floating floor: 18mm tongue-and-groove floorboardson 25mm mineral wool batt insulation density 150 kg/m3

(type FFT4)

Structural floor: 250mm min in-situ concrete slab,minimum density 2400 kg/m3, without screed

Applicable ceilings

Metal ceiling system: Cormet Dryliner or Cormet MFCeiling system providing 75mm (min) ceiling void with onelayer 12.5mm Lafarge Echeck wallboard

Timber ceiling system: any ceiling system providing a75mm ceiling void with one layer 12.5mm Lafarge Echeckwallboard


Solution Solution

E-FC-3 Screed: 65mm (min) sand/cement screed, or 40mmLafarge Gyvlon screed (nominal weight 80 kg/m2)

Upper resilient layer: 5mm foamed polyethylene 30-36 kg/m3

Lower resilient layer: 25mm mineral wool batt 140 kg/m3 (min) or 25mm expanded SD grade polystyreneor extruded polystyrene

Structural floor: 150mm minimum precast concreteplanks (minimum weight 300 kg/m2)

Applicable ceilings

Metal ceiling system: Cormet Dryliner or Cormet MFCeiling system providing 100 or 150mm ceiling void withone layer 12.5mm Lafarge Standard wallboard

Timber ceiling system: battens and counter battensproviding a 100mm ceiling void with one layer 12.5mmLafarge Standard wallboard


Solution Solution

Ceiling CT3 shown

Metal ceiling shown



.

In new build and renovation,fixing plasterboard to timber joistsprovides a fast and effectivemeans of creating ceilings. Boardscan be nailed directly to timbers,although screw-fixing providessuperior performance.

Incorporation of a CormetResilient Bar between the boardand joist offers further enhancedacoustic performance and helpsprevent timber movement causingcracking along board joints.



179

4

180



Nail fixing

Joist

Nogging

All joints staggered

Lafarge Drywall Nailsat 150mm centres infield of wallboard

Lafarge Drywall Nails at150mm centres atperimeter and cut endsof wallboards

Screw fixing

Joist

Nogging

All joints staggered

Lafarge High ThreadScrews at 230mm centresin field of wallboard

Lafarge High ThreadScrews at 150mm centresat perimeter and cut endsof wallboards

Timber Frame CeilingsPlasterboard ceilings on timberframing are typically for domesticapplications, the plasterboard beingattached directly to the underside offloor joists or the bottom chords ofroof trusses. Fixing is simple. Onceattached they:

• Provide a smooth finish for directdecoration after taping andjointing

• Can be given a textured finish

• May form a base for gypsum skimplaster manufactured inaccordance with BS 1191: Part 1:1973, Types b1 and b2

They also allow upgrading of a basicceiling construction, whether new orexisting, to provide greater fireresistance and sound insulation asrequired.

Performance

The selection of boards will dependon the performance required for fireresistance and sound insulation:refer to the performance tables 4.1to 4.7 and 4.12.

Lafarge plasterboards andcomponents are defined as Class 0 inaccordance with the NationalBuilding Regulations 1991 ApprovedDocument B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1997 and Euroclass A2.

Cormet metal sections and Lafargegypsum-based jointing compoundsare non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1

Best practice recommendation

Screw fixing using Lafarge HighThread Screws provides superperformance and helps preventtimber movement causing ‘nail-popping’ and cracking along theboard joints.

Introduction


BoardsCompoundsScrewsResilient Bar

8

Finishes 7

For fixing lengths refer to tables 8.8and 8.9 on page 333.

Table 4.15 Maximum joist spacingsThickness Board type Joist centres maximum (mm)(mm) with without

noggings noggings

12.5 Standard wallboard/Predeco 600 450

lath, round edge baseboard 600 450

Firecheck wallboard*/Megadeco 600 450

Vapourcheck wallboard* 600 450

Moisturecheck wallboard 600 450

15 Standard wallboard/Predeco 600 450

Firecheck wallboard*/Megadeco 600 450

19 Plank 600 600

*when using Vapourcheck wallboard and Firecheck wallboard noggings may be required to comply with the degree ofvapour control and fire resistance required.



181

4

System assembly

Framing

Maximum joist spacings are given in table 4.14. Fixing lengths andspacings are given in Section 8 ofthis manual. Fixings should notbreak the paper surface.

Fix noggings around the ceilingperimeter and, if required, tosupport any board edges notalready supported by joists. Joistsand noggings must have a bearingface width of at least 44mm. Abearing face width of 38mm ispermissible in the case of trussedrafters manufactured to BS 5268:Part 3: 1985.

When using Lafarge wallboards,provide noggings to support thelong board edges. For two layerboarding, position the noggings tosuit the second (outer) layer. Alwaysapply plasterboard with the ivoryface exposed.

Best practice recommendations

Note: that only the front (Ivory) sideshould be plastered. Lafargewallboards are designed to receive askim coat on the face without thepaper overlap (Greyface).

Noggings may be required. Seetables 4.1 to 4.7 and 4.10.

Boarding

Fix plasterboards with their paperbound (long) edges at right anglesto the joists. Align wallboardsleaving a nominal 3mm gapbetween each other and centreedges of the plasterboard over thejoists.

A 3mm gap is always required withLafarge Lath to allow for keying ofthe plaster and on Lafarge Standardplasterboard when texturing.

Stagger joints between cut (short) edges and centre over joists or noggings. With two layerboarding, stagger joints and fixingsbetween layers.

Fix wallboards, working from thecentre of each board using eitherLafarge High Thread Screws at230mm centres in the main field ofthe board and at 150mm centres atthe perimeter and cut edges, orLafarge Zinc Drywall Nails fixed at150mm centres throughout. Fixingsshould be no closer than 10mm tothe bound edges and 13mm to thecut edges of the wallboards.

Application details

Ceiling/wall junction

Where there may be risk ofinterstitial condensation, use LafargeVapourcheck wallboard as the innerlayer (cavity side) of the ceiling, withthe metallised film facing the joists.

In ceilings incorporating LafargeFirecheck wallboard, the Firecheckmust always be used as the outerlayer (room side).

Perimeter nogging

Drywall Nails or screwsat 150mm centres atperimeter and cut endsof wallboards

Board and noggings layout: single layer plasterboard

12.5mm wallboards, joists at 400, 450 or 600mm centres15mm wallboards, joists at 400, 450 or 600mm centres19mm Plank, joists at 400, 450 or 600mm centres

Board and noggings layout: double layers of plasterboard

12.5mm wallboards, joists at 400, 450 or 600mm centres15mm wallboards, joists at 400, 450 or 600mm centres

All board ends lieon joists

boards cut to stagger jointsbetween layers

Noggings at 1200mm centres tosupport all board edges, as required

Perimeter noggings

All board ends lie on joistsin both layers

Noggings at 1200mm centres to supportedges of outer layer of boards as required

Perimeter noggings

182



Application details



183

4

Board layout for Baseboard:

Suitable for finishing with one coat plasterwork up to 3mm thickness. Plastermanufactured to BS 1191: Part 1: 1973, class B, types b1 and b2. Square edged baseboard 1220 x 900 x 9.5mm, joists at maximum 406mm centres

Joists 50mm wide at406mm centres

No intermediatenoggings

Perimeter nogging

Board layout for Lath:

Suitable for finishing with two coat plasterwork up to 5mm thickness to BS 1191: 1973, Class B, types b1 and b2lath 1220 x 600 x 12.5mm, joists at maximum 406mm centres

Joists 50mm wide atmaximum 406mm centres

No intermediate noggings Perimeter nogging

Application details

184





12.5 25

15.0 25

19.0 32

12.5 + 12.5 32

19.0 + 12.5 44

15.0 + 15.0 44

Timber joist with Cormet Resilient Bar


The sound insulation performanceof some systems is dependent uponthe attachment of a CormetResilient Bar, to the underside ofthe joists and perimeter noggingson all four sides of room. See tables4.1 to 4.12.

Cormet Resilient Bar is fixed at rightangles to the joists at 450mmmaximum centres (400mm for2400mm boards), through pre-punched holes in the flange using32mm Lafarge Drywall High ThreadScrews, with one fixing per joist/barintersection. Bars are jointed byoverlapping directly over joists, witha minimum 200mm overlap. Shortlengths of Cormet Resilient Barshould be used to infill betweenmain runs of Cormet Resilient Bar atperimeter noggings on walls parallelto joists.

Plasterboards are fixed with longedges at right angles to CormetResilient Bars at 230mm centresusing Lafarge Drywall Self TappingScrews. At cut ends and perimeterfix at 150mm centres. See table 4.14for length.

To ensure maximum soundinsulation performance, screws mustnot be in contact with the joists.This will mean screw fixing off theline of the joists.

Attention should be paid to fixinglength as too long a screw throughboard and Cormet Resilient Bar maycause acoustic bridging.

Cormet Resilient Barscrewed into timber joists

Plasterboard screwed intoCormet Resilient Bar offthe line of the joists

Application details

Table 4.17 Best practicerecommendations for maximumloadings for Cormet Resilient Bars

Centres Loading(mm) (kg/m2)

400 35

450 30


17

45

6

19

Downlighter in separating floor

Indicative separatingfloor

Cormet Resilient BarRBD3000

Cormet MF ceiling grid

12.5mm LafargeStandard wallboard



185

4


System reference (Insert Lafarge system reference from Performance Tables)Location ........................Client reference ........................FramingTimber shall be of the appropriate grades and sizes to support the imposedloads in accordance with BS 5266: Part 2 and BS 4978 and in accordance withdimensional standards in BS 8212: 1995. Moisture content of the timber shallbe no greater than 21% and falling at time of installation.

Joists/raftersSize ..............mm x ..............mm. Spacing ..............mm centres.

Perimeter noggingsAround perimeter fix full depth timber noggings, width ...............mm.

Intermediate noggingsTimber noggings, size 50 x 50mm to support long edges of boards securelyfixed to joists at ..............mm centres. (Intermediate noggings are requiredwhere: Fire resistance is required or Vapourcheck wallboard is used.)

Resilient BarsCormet Resilient Bar RBD3000 fixed at right angles to joists at ..............mmcentres using Lafarge High Thread Screws, length 32mm.

Floor boardsTongue-and-grooved chipboard/ plywood/ softwood boarding, thickness..............mm.

Nailed or screw fixed to joists at ..............mm centres

Spot bonded with Lafarge Drywall Adhesive to Lafarge Standard wallboard,thickness ..............mm to BS 1230: Part 1: 1985 on 30mm rock mineral wool.Minimum density 100 kg/m3 laid onto 12mm structural grade plywood to BS 6566 nailed at ..............mm centres to top of joists. (Required forseparating floors - see the Performance Tables)





All board joints to be staggered between layers.

FixingsNail fixing to timber joists

Lafarge Drywall Nails at maximum 150 mm centres at the board perimeter andmaximum 200mm centres in the field of the board,

Length, inner layer (Select from 30, 40, 50, 65)mm

Length, outer layer (Select from 30, 40, 50, 65)mmScrew fixing to timber joists

Lafarge Drywall High Thread Screws at 230mm centres in field of plasterboardand 150mm centres at cut end and perimeter of room,


Length, outer layer (Select from 32, 38, 41, 51, 63, 76)mmScrew fixing to Cormet Resilient Bars

Lafarge Drywall Self Tapping Screws at 230mm centres in field of plasterboardand 150mm centres at cut end and perimeter of room,



FinishingLafarge Taping and jointing system, or Lafarge Supreme Skim Plaster, orLafarge Predeco taping and jointing system

Materials and InstallationAll materials, unless otherwise indicated, shall be supplied by LafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Lafarge Timber FramedCeilings

Scope

Ceilings framed using Lafargeplasterboards mechanically fixed tothe underside of timber floor orceiling joists.

Additional clauses

Add general clauses in Section 8 ifrequired for:





NBS clauses




Notes:



186



Case study


F L O O R S A N D C E I L I N G SCORMET DRYLINER CEILINGS

187

4

Even in new buildings joists maybe uneven and such problems arecommonly encountered inrenovation work, particularly inthe case of older properties.

The Cormet Dryliner CeilingSystem uses adjustable metalbrackets to compensate for anyunevenness, making it much easierto achieve a true, flat surface.

The system offers improved soundand fire performance and avoidsthe risk of cracking due to boardsbeing directly fixed to timberswhich may themselves be subjectto movement.

Cormet Dryliner ceilings provide aconvenient means of creating acavity to accommodate serviceswithout the need to drill joistswhich could potentially weakenthe overall structure.

188

F L O O R S A N D C E I L I N G SCORMET DRYLINER CEILINGS TO TIMBER FLOORS


Cormet DrylinerChannel RD1

Cormet Dryliner Track RD9

Cormet Dryliner ChannelConnector RD3

Cormet Dryliner JoistConnector RD5

Cormet Dryliner JoistConnector RD10

Table 4.18 Cormet Dryliner system componentsComponent Lafarge Dimensions Maximum Minimum

code (mm) cavity (mm) cavity (mm)

Cormet Dryliner RD1 17 x 47 – –Channel

Cormet Dryliner RD3 16 x 47 – –Channel Connector

Cormet Dryliner RD5 47 x 100 65 25Joist Connector

RD10 47 x 180 120 25

Cormet Dryliner RD2 63 x 47 x 35 60 25SR Bracket

Cormet Dryliner RD11 133 x 47 x 35 130 25XR Bracket

Cormet Dryliner RD9 20 x 19 x 30 – –Track

Lafarge High 32DHT25 32 – –Thread Screws

Lafarge Drywall As appropriate for board thicknessScrews

Lafarge Pan Head 11PHST25 11Screws 11PHSD25 11

Cormet Dryliner to timberjoist floorsCormet Dryliner is a simple, quick,cost-effective and completely dryceiling system.

It is fixed directly to timber joists toprovide high levels of fire protectionand sound reduction and isparticularly suitable for use onuneven timber joists to achieve aflat ceiling surface.

Performance

The selection of boarding willdepend on the performancerequired for fire resistance andsound insulation. Refer toperformance table 4.8.


Cormet metal sections and Lafargegypsum-based jointing compoundsare non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Components

The range of components is shownin table 4.18.


BoardsCompoundsScrewsMetal

8

Finishes 7

17

47

19

30

20

16

47

180

47100

47

Introduction

Cormet Dryliner SRBracket RD2

Cormet Dryliner XRBracket RD11

133

47

35

63 47

35



189

4

Table 4.20 Joist connector centresBoard thickness Maximum (mm)

12.5 mm plasterboard single layer 900


All double layer boarding 600

Table 4.19 Maximum framing centresBoard thickness Board length Dryliner Channel(mm) (mm) centres (mm)

12.5 2400 400

1800, 2700 450

3000 450

3600 450

15 and 19 2700 450

3000 600

System assembly

Fix Cormet Dryliner Track RD9 towalls and around columns etc at600mm maximum centres, makingallowances in the ceiling height forthe thickness and number of layers ofplasterboards to be used.

Mark on underside of CormetDryliner Track parallel to joist forpositioning of RD1 Cormet DrylinerChannels. Spacing as table 4.19.

Set levels and secure CormetDryliner Joist Connector RD5 orRD10 depending on cavity depth toside of joist on line of CormetDryliner Track RD9 with two 32mmLafarge High Thread Screws(32DHT25) at maximum spacing asspecified in table 4.20. Ensureconnectors are level.

Locate Cormet Dryliner ChannelRD1 into Cormet Dryliner Track.Where necessary extend the lengthof the Dryliner Channel byconnecting lengths of channeltogether with Dryliner ChannelConnector RD3.

Offer Dryliner Channel to joistconnectors and twist to secure.

Cormet Dryliner to timber joisted floor

Cormet ChannelConnector

JoistCormet JoistConnector or CormetDryliner Bracket

Cormet DrylinerChannel

Mineral woolinsulation

Cormet DrylinerTrack to ceilingperimeter

Double layer boarding

With two layerboarding, staggerjoints and fixingsbetween layers

Application details

190



Upgrading

The Cormet Dryliner system mayalso be used to upgrade the fireand/or sound insulation propertiesof timber joist floors where theexisting ceiling is to be retained. See drawing below.

Application details

Existing flooring

Existing plasterboard ceiling*Cormet Dryliner SR or XR Bracketfixed through existing ceiling into joist

Cormet Dryliner Channel

Cormet DrylinerTrack to ceilingperimeter

New suspended ceiling

*If existing ceiling is comprisedof wood lath and plaster it willbe necessary to support theexisting ceiling by using chickenwire stapled to existing joints.

Upgrading existing timber joist floor with Cormet Dryliner

Floor joists

System assembly

Fix the Cormet Dryliner Track RD9to walls and around columns/staircase perimeters at 600mmmaximum centres, using suitablefixings, making allowances in theceiling height for the thickness andnumber of layers of plasterboards.

Set levels and mark centre line ofeach joist on the existing ceiling, fix aCormet Dryliner Bracket RD2 or RD11,depending on the cavity required, tothe joists with two 38mm LafargeHigh Thread Screws at maximumcentres as defined in Table 4.20.

Locate Cormet Dryliner Channels RD1into the Cormet Dryliner Track, wherenecessary extend the length of theCormet Dryliner Channels by using aCormet Dryliner Channel ConnectorRD3, and align with the position ofthe Cormet Dryliner Bracket.

Ensure that the Cormet DrylinerChannel is level and secure theCormet Dryliner Channels to each legof the Cormet Dryliner Bracket usingLafarge Pan Head self tapping screws11PHST25.

Note: where required bend back thelegs of the Cormet Dryliner Bracket ifthey protrude past the face of thechannel.



191

4

Cormet Dryliner SuspendedCeilings to Timber Joists

Scope

Plasterboard suspended ceilingssupported on Cormet Dryliner metalframework from softwoodjoists,cavity depth 20-130mm.

Additional clauses






NBS clauses





Location ........................Client reference ........................JoistsTimber shall be of the appropriate grades and sizes to support the imposedloads in accordance with BS 5266: Part 2 and BS 4978 and in accordance withdimensional standards in BS 8212: 1995.

Moisture content shall be no greater than 21% and falling at time ofinstallation.

Joist size .................mm x .................mm, spacing .................mm centres.

Floor boardsTongue-and-grooved chipboard/tongue and grooved plywood/square edgesoftwood boarding, thickness .................mm. Nailed or screw fixed to joists at.................mm centres.

Metal framing componentsFraming components to be hot dipped galvanised steel to BS EN 10143: 1993and BS EN 10142: 1990 and Approved Document A1: 1995 designated DX51Dand Z275 NAO. Sections rolled to BS 2994 : 1987.

Metal frameworkCormet Dryliner Channels RD1 to BS 7364: 1990 at .................mm centresconnected to substrate using Lafarge Joist Connector *RD2/RD5/RD10/RD11 at.................mm maximum centres along joist. Joist Connectors fixed to side ofjoists using 2 No Lafarge High Thread Screws length 32mm, with minimum30mm overlap of joist connector onto joists.

Dryliner Channels connected together using Cormet Dryliner ChannelConnectors RD3. (Where ceiling length exceeds length of dryliner channel.)





Screw fixingsLafarge Drywall Screws at maximum 230mm centres in field of board, 150mmat cut ends and perimeter of room, type Drywall Self Tapping


Length, outer layer (Select from 25, 32, 38, 41, 44, 51, 57, 63, 67, 76)mm, or

Lafarge Drywall High Thread Screws, two per hanger, length 32mm.




Materials and InstallationAll materials, unless otherwise indicated, shall be supplied by LafargePlasterboard Ltd. and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.


Notes:



192



Installation

Step oneMark position onwalls for desired clearspace/ceiling height,taking into accountthe thickness andnumber of layers of plasterboards tobe used. Fix CormetDryliner Track RD9 towalls and aroundcolumns etc at600mm maximumcentres.

Mark walls onunderside of CormetDryliner Tracks thatare parallel to joistsfor position ofCormet DrylinerChannels RD1.Spacing as table.

Step twoSet levels and secure CormetDryliner JoistConnecter RD5 orRD10, depending on cavity depth, toside of joist, on lineof Cormet DrylinerChannel with two32mm Lafarge HighThread Screws32DHT25 spaced astable. Ensure CormetDryliner JoistConnectors are level.

Step threeOffer one edge ofRD9 Cormet DrylinerChannel to the JoistConnector, once it islocated in the fixinglug, push theopposite edge ofthe channel intoposition. Wherenecessary extend thelength of the CormetDryliner Channel byconnecting twolengths of CormetDryliner Channeltogether withCormet DrylinerChannel ConnectorRD3.

Step fourCut Cormet DrylinerChannel RD1 atmaximum 5mmshorter than thelength of the ceilingrequired and locateCormet DrylinerChannel RD1 intoCormet DrylinerTrack.

InsulationWhere requiredinsert mineral woolinsulation above theframing, ensuringthat the mineralwool forms onecontinuous lining.

Step fiveFix plasterboardswith the long edgesat right angles to theCormet DrylinerChannels. Screw-fixboards to CormetDryliner Channelsat 230mm maximumcentres and 150mmmaximum centres atperimeters of roomand the cut ends of board.

With two layers ofplasterboard, staggerall joints betweenthe layers. For typicalsingle layer and two-layer plasterboardlayouts, see diagramsin Details section.

JointingApply Lafargejointing compoundsto all joints either byhand or machine –see Section 7.

1

2

3

4

5

Board Board Dryliner thickness length Channel(mm) (mm) centres (mm)

12.5 2400 400

1800, 2700, 3600 450

3000 600

15 and 19 2700 450

3000 600

Board Maximum spacing

thickness of brackets to joists (mm)

9.5mm plasterboard single layer 900






F L O O R S A N D C E I L I N G SCORMET DRYLINER CEILINGS TO CONCRETE FLOORS

193

4

Cormet Dryliner Channel RD1 Cormet Dryliner SR Bracket RD2

Cormet Dryliner ChannelConnector RD3

Cormet Dryliner XR Bracket RD11Cormet Dryliner Track RD9

17

47

16

47

20

19

30

63 47

35

133

47

35

Table 4.22Cormet Dryliner System components

Component Lafarge Dimensions Maximum Minimumcode (mm) cavity (mm) cavity (mm)

Cormet Dryliner RD1 2400, 2700 _ _Channel 3000, 3600

Cormet Dryliner RD2 63 60 25SR Bracket

Cormet Dryliner RD11 133 130 25XR Bracket

Cormet Dryliner RD3 100 – –Channel Connector

Cormet Dryliner RD9 3000 – –Track

Lafarge Pan 11PHST25 11 – –Head Screws

11PHSD25 11

Table 4.21 Cormet Drylinerframing systems

Framing Cavity width(mm)

Standard reach (SR) 25 – 60

Extended reach (XR) 25 – 130

The system can therefore be usedfor all common lining applications to:

• utilise minimum space

• allow for hidden services

• provide high levels of acousticperformance.

Performance



For systems performance data referto performance tables.

Components


Cormet Dryliner to concretesoffits/floor slabsAs a ceiling lining Cormet Drylineris fixed directly to the existingconcrete soffit allowing a cavitywidth between soffit andplasterboard lining ranging from25mm to 130mm.

For larger voids use Cormet MFSuspended Ceiling System. Thissystem also lends itself tooverboarding existing ceilings whereimproved acoustic performance isrequired.

Introduction



8

Finishes 7

194



Cormet Dryliner to concretefloor slabs

Cormet DrylinerTrack

Cormet DrylinerChannelCormet Dryliner Bracket

Table 4.23 Maximum framing centresBoard thickness Board length Dryliner Channel(mm) (mm) centres (mm)

12.5 2400 400

1800, 2700, 3600 450

3000 600

15 and 19 2700 450

3000 600

Table 4.24 SR and XR Bracket centresBoard thickness Maximum (mm)




System assembly – standardreach

The Standard Reach brackets aresuitable for cavity widths from25mm to 60mm.

Fix Cormet Dryliner Track RD9 at600mm centres to adjacent wallsallowing for required cavity.

Mark horizontal lines on the ceilingto locate Cormet Dryliner ChannelsRD1, spacing as table 4.23.

Position Cormet Dryliner Bracketsdirectly to soffit at maximumspacings as specified in table 4.23along marked lines. Secure to soffitwith suitable fixing throughhorizontal slot and fold down legs.Cut Cormet Dryliner Channel RD1,5mm shorter than the ceiling lengthand locate Cormet Dryliner ChannelsRD1 into Cormet Dryliner Track.Where ceiling length exceedschannel length, connect two lengthsof channel together with CormetDryliner Channel Connector RD3.

Ensure Cormet Dryliner Channel RD1is level. Secure Cormet DrylinerChannel RD1 to each leg of CormetDryliner Bracket using Lafarge PanHead Screws (11PHST25). Wherenecessary bend back the legs of thebracket if they protrude past theface of the channel.

Insulation

Where required, insert mineral woolbatts above the framing ensuringthat the mineral wool forms onecontinuous lining.

Boarding

Fix plasterboards with long edges atright angles to RD1 Cormet DrylinerChannel, butt firmly against theperimeter and fix to the framingwith Lafarge Drywall Screws at230mm maximum centres and150mm maximum centres atperimeter of room and cut end ofplasterboard. Align wallboardsleaving a nominal 3mm gapbetween each other and centreedges of the plasterboard over thechannels. Noggings are not requiredin metal framed ceilings. With twolayer systems stagger all jointsbetween layers.

Jointing

Apply Lafarge jointing compoundsto all joints either by hand or bymachine in accordance with LafargePlasterboard’s instructions, seeSection 7.

Application details



195

4

Cormet Dryliner SuspendedCeilings to Concrete Soffits

Scope

Plasterboard suspended ceilingssupported on Cormet Dryliner metalframework from softwood joists,cavity depth 20-130mm.

Additional clauses






NBS clauses





Location ........................Client reference ........................Metal framing componentsFraming components to be hot dipped galvanised steel to BS EN 10143: 1993and BS EN 10142: 1990 and Approved Document A1: 1995 designated DX51Dand Z275 NAO. Sections rolled to BS 2994: 1987.

Metal frameworkCormet Dryliner Channels RD1 to BS 7364: 1990 at ............mm centresconnected to substrate using Dryliner Bracket RD2 or RD11 at ............mmcentres. Secure to RD1 with Lafarge Pan Head Screws.

Always ensure the Dryliner Bracket is secured to the concrete substrate with asuitable fixing as approved by a specialist fixing manufacturer.

Dryliner Channels connected together using Cormet Dryliner ChannelConnectors RD3.

Metal framework fixingSpit Pulsa 700P nailing system for concrete or steel using fixings dependent onmaterial substrates at max 600mm centres





BoardingCeiling: One/two layers Lafarge ............... wallboard




Screw fixingsLafarge Drywall Screws at 230mm centres in field of plasterboard and 150mmcentres at cut end and perimeter of room, type Drywall Self Tapping



FinishingLafarge Taping and Jointing System, or


Lafarge Universal Texture

Materials and InstallationAll materials unless otherwise indicated shall be supplied by LafargePlasterboard Ltd, and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Given the vast selection of different types of substrate that areencountered on site, it is strongly recommended that adequate site tests becarried out to establish a recommended load on fixings.


Notes:



196



Case study

Baltic Centre for Contemporary Art

Client: Gateshead Council Architect: Ellis Williams

Drywall contractor: Baris

Main contractor: HBG Construction

Baltic Flour Mill was originally a grain store but has now been converted into a stunning gallery for contemporary art. Drywall systems make a very significant contribution to the clean, airy spaces of the interior as well as offering many practical benefits. The impressive gallery spaces, in places rising to heights of 10 metres and more, are lined with Megadeco board which is used in conjunction with load-bearing metal studs and a plywood inner layer. The plywood ‘background’ provides the additional strength needed to carry heavier exhibits, whilst the Megadeco facing combines fire and acoustic performance with a tough, impact resistant finish.


F L O O R S A N D C E I L I N G SCORMET METAL FURRING (MF) SUSPENDED CEILINGS

197

4Cormet Metal Furring (MF)Suspended Ceiling provides a flat,seamless and acoustically superioralternative to lay-in grid systems.

They allow the creation of deepvoids between ceiling and soffit toaccommodate large amounts ofservice equipment.

These features have led to CormetMF Ceilings being regularlyspecified in conversion projects,cinemas, hospitals and multi-occupancy residentialdevelopments.

198

F L O O R S A N D C E I L I N G SCORMET M.F. SUSPENDED CEILING


Table 4.25 Cormet M.F. Suspended Ceiling componentsComponent Lafarge Dimensions Length

code (mm) (mm)

Cormet Ceiling MFCC50 79 x 25 3600Channel

Cormet Primary MFCP44 15 x 44 3600Channel

Cormet Edge MFCE26 19 x 26 x 28 3600Channel

Cormet Metal MFC2330 23 x 30 3600Angle

Cormet MFCCLIP3 – –Connecting Clip

Cormet Soffit MFCCLEAT – –Cleat

Cormet Strap MFCSTRAP – –Hanger

Cormet PHONI – –Phonistar

Cormet PHONIMO – –Phonissimo

Component specifications may vary from those shown

50

25

79

15

44

19

26

28 30

23

Cormet Ceiling Channel MFCC50

Cormet Edge Channel MFCE26 Cormet Metal Angle MFC2330

Cormet Primary Channel MFCP44

Cormet M.F. SuspendedCeilingsCormet M.F. Suspended Ceilings aretypically for commercial applications.Ceiling height may be varied toaccommodate services, ducting etc.They provide a high performanceceiling and can be used to upgradeand protect existing structures.

They are compatible with CormetPartitioning systems. They provide a flush finish suitable for directdecoration or textured finish.

Performance

The selection of the ceiling systemand boarding will depend on theperformance required for fireresistance and sound insulation:refer to the performance tables 4.9and 4.10.

Fire spread



Sound insulation

Where improved acousticperformance is required, use twolayers of plasterboard to increasethe weight of the ceiling, andreduce indirect air leakage by:

• use of Lafarge IntumescentAcoustic Sealant at all perimeters

• use of glass/rock mineral woolinsulation

• introduction of cavity barriers

• interrupting the ceiling with fullheight partitions.

Components


Introduction



8

Finishes 7



199

4

Cormet M.F. Ceiling

Note: Where ceiling weight exceeds 20 kg/m2

(most double wallboard systems) use LafargeWafer Head Self Drilling Screws in lieu ofConnecting Clips. It is recommended that alldouble board systems are screw fixed.

Table 4.26 Recommendedmaximum ceiling loadings

Suspension Primary Maximum loadingcentres Channel including (mm) centres plasterboard

(mm) (kg/m2)

1200 600 74

1200 900 50

1200 1200 35

Table 4.27 Maximum framing centres

Board Board Ceilingthickness length Channel(mm) (mm) centres (mm)

12.5 2400 400

1800, 2700, 3600 450

3000 600

15 and 19 2400 400

2700 450

3000 600

System assembly

Suspension system

Fix Cormet Edge Channels to wallsand around columns etc at 600mmmaximum centres, makingallowance in the ceiling height forthe thickness and number of layersof plasterboard to be used.

Attach Cormet Soffit Cleats to thestructural soffit. Suspend the metalsystem from the Cormet SoffitCleats with Cormet Metal Angle orCormet Strap Hanger. Fix CormetMetal Angle to the Cormet PrimaryChannel with 2 self-drilling LafargePan Head Screws or Lafarge WaferHead Screws. Space the fixings at1200mm centres and CormetPrimary Channels at centres asshown in table 4.27.

Secure the Cormet Ceiling Channelsat right angles to the underside ofthe Cormet Primary Channels – seetable 4.276 – using Cormet CormetConnecting Clips, or Lafarge WaferHead Screws as note to illustration.Hook the clips to the flanges of theCormet Ceiling Channels and snap-fix over the top of the CormetPrimary Channel.

Note: Alternate Connecting Clipseither side of the Primary Channelalong its full length.

Join Cormet Primary Channels, byoverlapping them back to back by150mm and fixing with two bolts(MFCNB) or two Pan Head Screws.

Join Cormet Ceiling Channels bynesting together by 150mm andcrimping or screwing twice on eachside of the overlap.

Cormet Edge Channelfixed at 600mm centres

Cormet Ceiling Channels at400 or 450mm centres,secured by clips to CormetPrimary Channels

Cormet PrimaryChannels

Rigid Cormet Metal Angle at 1200mmcentres along Cormet Primary Channel

25mm Cormet Flat Strap MFCSTRAP may beused on ceiling drops up to 1 metre deep

Note: orientation ofConnecting Clipsreversed alternativelyalong Cormet PrimaryChannels

CormetSoffit cleat

Minimum150mm overlap

Application details

Screw-fix cut ends of boardsat 150mm centres

Screw-fix boards toCormet Ceiling Channelsat 230mm centres

Screw-fix boards toCormet Edge Channelat 150mm centres

Boarding

CormetConnecting Clip

Cormet Edge Channel Cormet CeilingChannel

Ceiling perimeter

Partition head

200



Single layer boarding

When using single layerplasterboard, fix with the boundedges at right angles to the ceilingsections, with adjoining edgeslightly butted. End joints must occurat the centre of the Cormet CeilingChannel, staggered by half a boardlength whenever possible leaving agap of up to 3mm between ends ofboard. The plasterboard is screwfixed to the ceiling sections at230mm maximum centres withLafarge Drywall Self Tapping Screwsof the appropriate length. Cut edgesof the plasterboard are screwed at150mm maximum centres to theCormet Ceiling Channel, likewise alledges are screwed to the CormetEdge Channel at wall junctions at150mm centres.

Screws must be no closer than 10mmto bound edges and 13mm to cutedges of plasterboard.

To maintain acoustic integrity, sealaround the perimeter of the ceilingwith Lafarge Intumescent AcousticSealant.

Double layer boarding

When using double layerplasterboard, the first layer is fixedas above. The second layer shouldbe fixed with all joints staggered inrelation to the first layer, still in thesame pattern, and screwed to theCormet Ceiling Channels andCormet Edge Channels as beforewith Lafarge Drywall Self TappingScrews, avoiding the screws used tofix the first layer.

Best practice

Where there may be a risk ofinterstitial condensation, useLafarge Vapourcheck wallboard asthe inner layer installed, with themetallised film facing the void,unless this is a cold void with aheated room below, when theposition should be reversed, orinsulation added to the void. Vapourcontrol layers should only be usedon the warm side of the structure.

Where used in ceilings LafargeFirecheck wallboard must always bethe roomside layer.

If the system is not going to betaped and jointed or skim coatplaster finished it is important that abead of Lafarge IntumescentAcoustic Sealant is applied to theperimeter to maintain the systemperformance.

Cormet U Track

Cormet Primary Channel

Cormet Ceiling Channel

Cormet Metal Angle


Application details



201

4

50

60 60

12.5

12.5

Cormet PrimaryChannel

CormetConnecting Clip

60 x 60mm rockmineral wool battto maintain fireintegrity

Cormet CeilingChannel

Lafarge Movement Control Joint

Movement control joint parallel to ceiling channels

Ceiling Channel A


60 x 100mm rockmineral wool batt tomaintain fire integrity

Lafarge MovementControl Joint

Movement control joint at right angles to ceiling channels

Overlap Ceiling Channel Awith Ceiling Channel B by50mm allowing to float free

Ceiling Channel B

CormetPrimaryChannel

Cormet metal studpartition

Cormet EdgeChannel screw-fixed to studs atmaximum600mm centres

Junction with full height partition

Movement control joints

The continuity of the plasterboardand supporting structure should bebroken by movement control joints:

• where the ceiling runs 10 metresor more in any direction

• where the ceiling crosses structuralmovement joints.

Movement joints runningparallel to the Ceiling Channels

Locate Cormet Ceiling Channelsalong each side 60mm from themovement joint (measured tocentres). Secure both Cormet CeilingChannels to Cormet PrimaryChannels with Cormet MFC Clips orLafarge Self Tapping Screws. Leavea gap in the runs of Cormet PrimaryChannel as wide as the joint andsupport the cut ends with hangers.

Movement joints running acrossthe Ceiling Channels

Form a 12.5mm gap along the lineof the movement joint, supportedby Cormet Primary Channels 60mmfrom each side of the joint.

To maintain the acoustic and fireintegrity of the ceiling, pack thespace behind the joint with 60mmrock mineral wool batt with adensity of 40 kg/m3.

When boarding the ceiling, leave a12.5mm continuous gap along theline of the movement joint.

When setting out in areas wherepartitioning is to be attached to theunderside of the ceiling, positionthe Cormet Ceiling Channels so as toallow the partition ceiling Cormet UTrack to be screw fixed to theCormet Ceiling Channels.

Suspend heavy loads, air ducting,lighting units etc directly from thestructural soffit to avoid loading ofthe Cormet suspension framing.

Application details

202




Cormet Ceiling Channels fixedvertically to Cormet EdgeChannels at top and bottom

Ceiling recess

Frame formedfrom CormetEdge Channel

Cormet Metal Angle

CormetCeilingChannel


Ceiling opening

Max

imu

m 6

00m

m

Cormet Metal Angle

Cormet Edge Channel

Cormet Ceiling Channel

Cormet Edge Channel

Ceiling recess

Ceiling recess detail incorporating achange in ceiling height is suitablefor a maximum change in level of600mm. For voids over 600mmcontact the Enquiryline.

Ceiling openings

Around openings for access panels,ducting, lighting troughs etc, form a frame from Cormet Edge Channelscrew-fixed over the ends of theCormet Ceiling Channels to bracethe ceiling grid.

Install extra Cormet PrimaryChannels to support Cormet CeilingChannels for large openings. Screwfix plasterboards to Cormet EdgeChannels around openings at150mm centres.

Application details



203

4

Phonissimo

Hanger M6 threaded bar at1200mm centres by others

Phonissimo Acoustic Hanger

100mm glass mineral wool insulation 10.5 kg/m3

Cormet UT52/Y Primary Channelat 1200mm centres

MFCC50 Ceiling Channels at 400mm centres

2 x 12.5mm Lafarge dBcheck wallboard

Phonistar

M6 threaded rod

Phonistar Resilient Hangers at 1200mm centres

Cormet UT52/Y Channel used as primary channelat 1.2m centres

MFCC50 Ceiling Channels at 400mm centres

3 x 15mm Lafarge dBcheck wallboard

100mm glass mineral wool insulation 10.5 kg/m3

Mass barrier ceilings

Downlighter in separating floor

Indicative separating floor

Cormet Metal Angle at 1200mm centres

Cormet Ceiling Channel at 400mm centres

2 x 15mm Lafarge dBcheck wallboard

Cormet Primary Channel at 900mm centres

Downlighterintumescentand acoustichood by others

Downlighter byothers

204




Location ........................Client reference ........................Structural SoffitPrecast concrete planks/timber joists/in-situ concrete floor/structural steelpurlins at .....................mm centres.

Fixings to structural soffitsCormet Soffit Cleats MFCCLEAT fixed to structural soffit using appropriatefixings, at 1200mm suspension centres and .....................mm centres forprimary channel. (Consult structural engineer or call our Technical Enquirylineon 01275 377789.)

Metal framing componentsFraming components to be hot dipped galvanised steel to BS EN 10143: 1993and BS EN 10142: 1990 and Approved Document A1: 1995 designated DX51Dand Z275 NAO. Sections rolled to BS 2994: 1987.

Metal frameworkCormet Edge Channel MFCE26 fixed at maximum 600mm centres to perimeterconstruction at finished ceiling level plus thickness of plasterboard lining.

Cormet Ceiling Channels MFCC50 at .....................mm centres, fixed usingCormet Connecting Clips MFCCLIP3/Lafarge Drywall Screws type self tappingto Lafarge Primary Channels MFCP44 spaced at .....................mm centres. (SeeTable 4.25 for Ceiling Channel centres and Table 4.24 for Primary Channelcentres.)

Primary Channel connected to Cormet Metal Angle Hangers MFC2330 spacedat 1200mm centres along Primary Channels using 2 No Lafarge Pan Head SelfDrilling Screws. Metal Angle Hangers fixed to MFCCLEAT with Lafarge Nut andBolt MFCNB.

All metal components to BS EN 10143 : 1993, BS 2994 :1976.

Metal framework fixing (Cormet Edge Channel MFCE26)Spit Pulsa 700P nailing system for concrete or steel using fixings dependent onmaterial substrates at max 600mm centres







Outer layer (Specify wallboard from the System Performance Tables)


Screw fixingsLafarge Drywall Screws at 230mm centres in field of board and at 150mmcentres at perimeter of room and cut ends of board. Type Drywall Self Tapping.




Lafarge Supreme Skim Plaster


Given the vast selection of different types of substrate that areencountered on site, it is strongly recommended that adequate site tests becarried out to establish a recommended load on fixings.

Cormet M.F. SuspendedCeilings

Scope

Plasterboard ceilings supported onCormet metal furring suspendedceiling from structural soffits, cavitydepth minimum 100-3500mm.

Additional clauses






NBS clauses





Notes:





205

4

Installation

Step oneMark position on wallsfor finished ceilingheight taking intoaccount the thicknessand number of layersof plasterboard to beused. Fix Cormet EdgeChannels to walls at600mm maximumcentres.

For the location of the Cormet PrimaryChannels, mark lineson ceiling at centresin accordance withthe thickness andnumber of layers tobe used – see table.

Step twoAttach Cormet SoffitCleats to the structuralsoffit at 1200mmcentres along thecentre lines forCormet PrimaryChannels.

Cut lengths of CormetMetal Angle equal tothe vertical distancefrom the CormetSoffit Cleats to thetop of the CormetEdge Channels. FixCormet Metal Angleto Cormet SoffitCleats with CormetNut and Bolt.

Step threeFix Cormet PrimaryChannel to CormetMetal Angles withtwo Lafarge PanHead Self DrillingScrews. Wherenecessary, join CormetPrimary Channel byoverlapping 150mm back to back andfixing with twoCormet Nuts andBolts.

Step fourSecure the CormetCeiling Channels atright angles to theunderside of theCormet PrimaryChannels, at centresas specified in table,using CormetConnecting Clips orif double wallboardsystem screw fixed.

For the entire lengthof each CormetPrimary Channel,alternate CormetConnecting Clips oneach side.

Step fivePosition boards with bound (long)edges at right anglesto the CormetCeiling Channelsections, withadjoining edgeslightly butted. End joints mustoccur at the centre of the CormetCeiling Channelsection, staggeredby half a boardlength wheneverpossible.

Step sixAcross field of board,screw-fix plasterboardat 230mm maximumcentres with DrywallSelf Tapping Screws.

Screw fix cut edges of the plasterboard at 150mm maximumcentres to the CormetCeiling Channel.Similarly screw fixall edges to theCormet Edge Channelat 150mm centres.

1

2

3

4

5

6

Suspension Cormet Primary Channel Maximum loadingcentres (mm) centres (mm) including plasterboard (kg/m2)

1200 600 74

1200 900 50

1200 1200 35

Board thickness Board length Ceiling Channel(mm) (mm) centres (mm)

12.5 2400 400

1800, 2700, 3000, 3600 450

15 and 19 2700, 3000 450


A Cormet Soffit Cleat is not required fortimber joist floors. Instead, fix Cormet MetalAngle direct to sides of timber joist with aminimum overlap of 50mm using aminimum of two 32mm High Thread Screws.

206

F L O O R S A N D C E I L I N G SCORMET MF CEILINGS


Case study


F L O O R S A N D C E I L I N G SCORMET ACOUSTIC FLOOR

207

4Cormet Acoustic floor is a highlyefficient means of creating a fullyfloated construction offeringexcellent protection againstairborne and impact soundtransfer.

This makes it the preferred choicefor multi-occupancy dwellings,particularly refurbishments. Allwork can be undertaken fromabove allowing intricate ceilingdesigns in older properties to beretained whilst achieving modernperformance standards.


208



Cormet Acoustic FloorCormet Acoustic Floor is a free-floating, sound insulating floorsystem for structural joist framing.The system has wide applications fornew build, conversion andimprovement work, in particular forremedial treatment of existingtimber joist floors where animproved sound rating is required.

It is designed as a separating floorbetween and within dwellings andcan be used with Lafarge Cormetwall lining and partition systems.

The system combines resilientlymounted floor and ceiling linings toadd mass and sound reduction whileminimising the overall thickness ofthe floor, adding only 6mm to thetop of the joists.

Joists should be even and level togain the benefits of the system.

Using standard components CormetAcoustic Floor is easy andeconomical to install and providesexceptional airborne and impactsound insulation together with a 60 minute fire resistance.

The floor has been tested inaccordance with BS 2750: Part 3:1980 and Part 6: 1980.

Performance on-site depends onfactors beyond the control ofLafarge Plasterboard.

Performance

Fire spread



Sound insulation and fireresistance

Sound insulation achieved willdepend on the system selected. Seetable 4.13, page 177. In all cases, afire resistance of 60 minutes isachieved.

Components

The Cormet Acoustic Floor systemuses a range of plasterboards andcomponents. Refer to table 4.28.Quantities will vary considerablydepending on room size and joistlayout.

Screws

63mm Acoustic Floor Screws(63AFST25) are recommended forsoftwood boarding and chipboardflooring. They are part threaded,self-tapping screws with a self-countersinking head.

Insulation

Use 100mm glass mineral wool quiltwith a density of 10.5 kg/m3, or100mm rock mineral wool with adensity of 40 kg/m3.

Table 4.28 System componentsComponent Lafarge code Dimension (mm)

Acoustic Floor Clip RAFC25 –

Resilient Tape RAFT50 50 x 6

Cormet Metal Angle MFC2330 23 x 30

Cormet Resilient Bar RBD3000 45 x 17

Acoustic Floor Screw 63AFST25 63

Introduction

8


Finishes 7


17

45

6

19



209

4

Cormet Acoustic FloorLafarge Plank or15mm LafargedBcheck

Lafarge Resilient Tape RAFT 50

Cormet Metal Angle

T&Gflooring

100mm mineralwool quilt

Cormet ResilientBar at 450mmmaximum centres

Ceiling: two layers of15mm Lafarge dBcheck

Acoustic Floor Clipat 400mmmaximum centres

N.B. Remedial work/conversions:Structural checks on existingfloor joists may be required.

Application details

System assembly

Place Cormet Acoustic Floor Clipover joist and hold against joist side.Secure by driving the serrated edgeof the clip into the top of the joistwith a hammer until it is flush. Clipsare spaced at 400mm centres onboth sides of the joist, except at theperimeter, where clips are spaced at400mm centres on the open sideonly. Clips are fixed opposite eachother except where the joist width istoo narrow which means that clipsmust be staggered.

Fix self adhesive Lafarge ResilientTape along the length of each joistover Cormet Acoustic Floor Clipsand along intermediate full depthand perimeter noggings. Lay CormetMetal Angle with the short leg intothe clips as shown. Cormet MetalAngle joins should be kept to aminimum. Where the joins occur,butt joint and support ends with aclip. Where joists are not true, theangle should be cut to shorterlengths, allowing easy release fromCormet Acoustic Floor Clip whensystem is screw fixed.

Flooring

Cut lengths of 19mm Lafarge Plankor 15mm Lafarge dBcheck 4mmshorter than the space between thejoists and rest the plasterboardplank on the Cormet Metal Anglesupports throughout. The metalangles should not touch joists. Laythe flooring across the joists at rightangles. Tongue-and-groovechipboard edges must be glued withPVA wood glue. Leave a 3mm gapbetween flooring and the perimeterwall and seal the gap with LafargeResilient Tape, before skirtings arefitted. Screw fix through theflooring and plank into the CormetMetal Angle either side of each joistusing 63mm Lafarge Acoustic FloorScrews. Cut ends of flooring mustrest over the joist and be fully screwfixed to the Cormet Metal Angle onboth sides of the joist. Refer toscrew pattern diagrams for tongue-and-groove chipboard softwoodflooring. The screws, whencountersunk, pull the Cormet MetalAngles out of the clips to clamp theplasterboard plank to the undersideof the flooring and create acompletely free-floating floor.

In refurbishment work, joists maynot be level. Levelling fillets shouldbe used to provide a level surfacebefore installing the Acoustic FloorSystem.

Acoustic Floor Clipsat 400mm centres toeither side of thejoist

Standard joist

Acoustic FloorClips at 400mmcentres alongthe open sideof the joist

Perimeter joist

Due to the potential for softwoodfloorboards to warp, it isrecommended that where they areused, 18mm plywood is screw fixedto the Acoustic Floor as describedabove and the softwood boardsglued and nailed or screwed to theply – avoiding the clips and metalangles.

210



Narrow joist

Acoustic Floor Clips staggered at 400mmcentres on both sides of the joist

Self adhesiveLafargeResilient TapeRAFT50 on joistover CormetAcoustic FloorClips

Cormet MetalAngle laid inCormetAcoustic FloorClips

Floor assembly

Screw fixthrough theflooring andPlank into theCormet MetalAngle

LafargePlank or15mmLafargedBcheck

Flooring

(First stage) (Second stage)

Table 4.29 Recommended screw lengths

Plasterboard Inner Outerlayers (mm) layer layer

(mm) (mm)

15.0 + 15.0 25 41

19.0 + 12.5 32 41

System assembly

Ceiling

Screw fix Cormet Resilient Barthrough the flange at right anglesto the timber joists, at maximum450mm centres, using 32mm DrywallHigh Thread Screws.

Cormet Resilient Bars can be jointedby lapping together directly overfloor joists.

Insert 100mm mineral wool quilt inthe cavity above the CormetResilient Bars.

Fixing plasterboard to CormetResilient Bars

Butt ceiling linings to wallperimeters. Screw fix boards to theunderside of the Cormet ResilientBars at 230mm centres in the fieldof the board and at 150mm centresat room perimeter and cut ends,ensuring that the screws do notpenetrate the joist framework. Seetable 4.29 for recommended screwlengths. Stagger joints and fixingsbetween layers. Seal all perimeteredges with Lafarge IntumescentAcoustic Sealant to maintain theperformance of the system.

Ceiling construction

100mm glassmineral wool incavity behindCormet ResilientBars

Cormet Resilient Barat right angles tojoists at maximum450mm centres

Two layers ofLafarge dBcheckwallboard withjoints staggered

Flooring

Lafarge Plankor LafargedBcheck

Application details

Lafarge ResilientTape RAFT50



211

4

Retention of existing ceiling

Where it is desired to retain anexisting ceiling as a feature,increased sound insulation can stillbe obtained by installing the CormetAcoustic floor system from above. Toensure that the fire and sound*requirements of the BuildingRegulations are met, an extra layerof 15mm Lafarge Firecheckwallboard will be required insidethe ceiling cavity. See illustrationopposite and system reference RAF 06 in table 4.13.

* Please refer to your BuildingControl Department for suitability ofsystem.


100mm wide stripsof 15mm LafargeFirecheck screwedto joists andsupporting 15mmLafarge Firecheckbetween each joist

100mm glassmineral woolquilt

Existing ceiling oftimber lath andplaster retained

Retention of existing ceiling (system RAF 06)

Perimeter detail

Pack void between joist and wallwith glass mineral wool packing

Lafarge Resilient Tape


Lafarge Plank

T&G plywood,softwood orchipboard flooring,minimum thickness18mm

Lafarge Plank orLafarge dBcheck

Flooring

Application details

Jointing

All joints to be staggered betweenlayers, with all joints in the outerlayer taped and filled in accordancewith Lafarge Plasterboard’sinstructions. Refer to Section 7.

Where there is strutting betweenfloor joists it may be necessary toleave gaps in the Cormet MetalAngle and wallboard planks. LafargeResilient Tape should be applied tothe tops of full depth solid struts.

Table 4.30 Best practicerecommendations for maximumloadings for Cormet Resilient Bars

Centres Uniform distributed(mm) load (kg/m2)

400 35

450 30

212



Screw pattern: chipboard flooring

Perimeter joist

All floorboard endslie on joists (exceptfor flooring withtongue and grooveto all four sides)

Staggered flooring Cormet AcousticFloor Clips

Cormet Metal Angle Lafarge Plank orLafarge dBcheck

Application details

Screw pattern: softwood flooring*

Perimeter joist Staggered flooring

all floorboard endslie on joists

*Plywood/chipboard or OSB should be installed undersoftwood. Not shown in illustration – see Introduction.



213

4

Cormet Acoustic Floor system (Insert Lafarge system reference fromPerformance Tables)

Location ........................JoistsTimber shall be of the appropriate grades and sizes to support the imposedloads in accordance with BS 5266: Part 2 and BS 4978.

Moisture content shall be no greater than 21% and falling at time ofinstallation.

Joist size ................... mm x ...................mm (Minimum width 38mm)Spaced at ...................mm centres in accordance with dimensional standards inBS 8212: 1995


Flooring19mm Lafarge Plank to BS 1230: Part 1: 1985 cut to size and laid betweenjoists supported on Cormet Metal Angles MFC2330 in Acoustic Floor ClipsRAFC25 to BS 1449: Part 1: 1993 coated with black phosphate fixed at 400mmcentres to joists.

Lafarge Resilient Tape RAFT50 self adhesive rubber tape fixed onto tops ofjoists over clips.

Tongue-and-grooved chipboard/oriented strand board/tongue and groovedplywood/ square-edge softwood flooring fixed through plank into metalangles using Lafarge Acoustic Floor Screw 63AFST25, in accordance with screwpattern recommended by Lafarge Plasterboard. Seal around perimeter withLafarge Resilient Tape RAFT50.

System RAF 06

Salvaged/Reused/New ...............mm tongue and grooved/plain edge boardingglue and nailed/screwed at 400mm centres to chipboard/OSB/plywood.

Additional layer of 15mm Lafarge Firecheck wallboard cut to size and laidbetween joists bonded with Lafarge Intumescent Acoustic Sealant to strips of15mm Lafarge Firecheck wallboard 100mm deep nailed to sides of each joist.(Required where original ceiling is to be retained - System RAF 06)

CeilingCormet Resilient Bars RBD3000 fixed at right angles to joists at ...............mmcentres with Lafarge High Thread Screws length 32mm. (Not required forsystem RAF06. 400mm centres for 2400mm length board, 450mm centres for2700mm length board.)




Ceiling: Thickness ............... mm fixed to Resilient Bar.



Screw fixing to Cormet Resilient BarsLafarge Drywall Screws at 230mm centres in field of board, 150mm at roomperimeter and at ends, type Drywall Self Tapping

Length, inner layer (Select from 25, 32)mm

Length, outer layer (Select from 32, 38, 41, 44)mm

FinishingLafarge Taping and Jointing System, or




Cormet Acoustic Floor

Scope

Sound resisting floor constructionusing Cormet Acoustic Floor Systemcomponents for new build andrefurbishment work.

Additional clauses






NBS clauses





Notes:



214



Step onePlace Cormet AcousticFloor Clip over joistand hold against joistside. Secure by drivingthe serrated edge ofthe clip into the topof the joist with ahammer.

Space clips at 400mmcentres on either sideof the joist, except atthe perimeter, whereclips should be fixedat 400mm centres onthe open side only.

Step twoLay Cormet MetalAngle with the shortleg into the clips.Cormet Metal Anglejoints should be keptto a minimum.Where the joinsoccur, butt joint andsupport ends with aclip.

Where joists are nottrue, cut CormetMetal Angle to suit.

Step threeCut lengths of 19mmLafarge Plank or15mm LafargedBcheck wallboards4mm shorter thanthe space betweenthe joists ensuringyou keep bothbound edges intact.Maintaining an evengap between plankand joist, place theplanks on the CormetMetal Angle supportsthroughout.

Step fourFix self adhesiveLafarge ResilientTape along thelength of each joistover the CormetAcoustic Floor Clipsand alongintermediate fulldepth and perimeternoggings.

Step fiveLay the flooring acrossthe joists at rightangles. Tongue-and-groove chipboardedges must be gluedwith PVA wood glue.Leave a 3mm gapbetween flooring andthe perimeter walland seal the gap withLafarge IntumescentAcoustic Sealant orLafarge ResilientTape RAFT50 beforeskirtings are fitted.

Screw-fix through the flooring and plankinto the Metal Angleeither side of eachjoist using 63mmCormet Acoustic FloorScrews at 300mmcentres maximum.

Note: do not fixflooring direct tojoists.

Step sixThe screws, whenscrewed home andcountersunk, pull theMetal Angles out ofthe clips to clamp theplank to the undersideof the flooring andcreate a completelyfree-floating floorsupported on theLafarge Resilient Tape.

1

2

3

4

5

6

Installation

For details on fixing the ceilingbelow refer to section Direct totimber, page 169.




215

4

Robust Detail E-FC-1

Robust Details

Robust Detail E-FC-2

Robust Detail E-FT-1

Ceiling type CT1:Cormet MF Ceiling system providingminimum 100mm ceiling void

12.5mm Lafarge Echeck wallboard

Resilient overlay shallow platform floor (FFT5)

40mm minimum sand:cement screed orLafarge Gyvlon screed (Minimum 80 kg/m2)

150mm minimum precast structural floor

Ceiling type CT1:Cormet MF Ceiling system providingminimum 75mm ceiling void

12.5mm Lafarge Echeck wallboard

Resilient cradle and batten floatingfloor (FFT2)

250mm minimum in-situ concrete slab

Cormet Resilient Bar at 400mm centres

Double layer of 15mm Lafarge Firecheckwallboard

18mm T&G chipboard

19mm Lafarge Plank

15mm timber deck

240mm deep timber I-joists

Resilient composite batten system

216



Case study

FIRE PROTECTION 5


Fire protection fromLafargeWhen deciding on appropriatemethods of fire protection, thespecifier needs to be absolutely surethat the systems selected are bothreliable and totally effective. Theseare the most important designconsiderations, as lives andlivelihoods are at stake, and it isimperative to make the rightdecisions. Not only are LafargeCormet fire protection systemsreliable and effective, they are moreeconomic and practical to install on-site than alternative constructions.

Lafarge offer a full range of passivefire protection products, fromcompartment walls to specialsystems for encasing beams andenclosing shafts. Lafarge systemshave been exhaustively tested byindependent test houses, tried andrefined over many years to satisfy arange of regulatory standards.

Fire testing

All Lafarge Plasterboard systems aretested at one of the following:

• Building Research Establishment

• Timber Research andDevelopment Association

• Warrington Fire Research

• Aycliffe Fire Testing Facility

This means that installers andspecifiers can be absolutely sure thatLafarge Cormet fire protectionsystems are tested in accordancewith BS 476: Part 21: 1987 or BS 476: Part 22: 1987 as appropriateby the UK’s leading independentaccredited test houses, so there is a100% guarantee that systems work,when installed to Lafargespecification.

Details on Lafarge Plasterboard SteelProtection systems are also listed inthe ASFP (Association for SpecialistFire Protection) Yellow Book.NB: The data shown in the tables under fireresistance has been tested to BS 476: Part 21: 1987 (Beams and Columns),BS 476: Part 22: 1987 (Shaft Walls)

Cormet Shaftwall

Cormet Shaftwall is a fire protectionsystem providing up to 120 minutesfire resistance for shafts in multi-storey buildings, including lift shafts,stairwells, service ducts and plantrooms.

It is erected from one side only. Thisfeature also makes it ideally suitedfor lining and dividing largeindustrial or warehouse spaces andmeeting Building Regulations fireresistance requirements where suchpremises are within 1 metre of anadjacent property.

Cormet Shaftwall is light inconstruction and is ideal for fasttrack construction programmes.

Cormet Column and Beam ClipSystem

In a fire, unprotected structural steelbegins to lose its strength attemperatures above 550ºC. Selectionof a suitable encasement system isessential. The factors which affectthis selection are:

• the period of fire protectionrequired

• the physical properties (size andmass) of the steel section

• the application – column or beamand the number of exposed faces,2, 3 or 4.

The degree of fire protectionrequired for a steel section has beenshown to depend on its Hp/A factor,which is a function of the heatedperimeter of the section related toits cross sectional area. A sectionwith a high Hp/A factor will heat upmore rapidly than one with a lowHp/A factor, and so may require ahigher specification of encasementto achieve the same level of fireprotection.

To select the optimum encasementsolution:

1. Identify the period of protectionrequired.

2. Confirm the number of sides tobe protected.

3. If the protection factor of thecolumn, beam or joist is notknown, consult tables 5.6 to 5.8to identify the Hp/A.

4. Decide on the appropriateCormet fire protection system,details of which are given in thissection, tables 5.1 to 5.5 and 5.9.

5. Choose thickness of materialsfrom Hp/A tables for eachLafarge system

6. Design details.

F I R E P R O T E C T I O NINTRODUCTION

ContentsPerformance tables 219

Cormet Shaftwall 227

Cormet Column and Beam Clip System 237



F I R E P R O T E C T I O NCORMET

219

5

Performance tables

RCS 106

RCS 203

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6

Soun

d in

sula

tion

(dB

) R w

Studs: 60mm wide Cormet CHS60/B Studs at 600mm centres

Boarding: Inner; 25mm Lafarge Firecheck CoreboardOuter; one layer 15mm Lafarge Firecheck wallboard or 15mmLafarge Megadeco wallboard






RCS 208 Studs: 90mm wide Cormet CHS90/B Studs at 600mm centres



Table 5.1 Cormet Shaftwall: 60 minutes fire protection systems

36 4.2 78 60 45

35 4.2 78 60 39

36 6.0 107 60 43

37 6.0 107 60 51


RCS 102

RCS 310 Studs: 146mm wide Cormet CHS146/B Studs at 600mmcentres





37 6.8 161 60 43

38 6.8 161 60 51

* Based on stiffness measurements to BS 5234: Part 2. These will be affected by deflection and air pressure criteria. Refer to table 5.11, page 231.



The values shown above are for imperforate systems utilising taper edge plasterboard with all joints taped and filled and systems installed in accordance withthe recommendations of Lafarge Plasterboard Ltd. The quoted performance can only be achieved by the use of Lafarge components throughout. Any variationshould be referred to the Lafarge Technical Enquiryline for confirmation of acceptance.

220



Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6

RCS 104

RCS 205


Boarding: Inner 25mm Lafarge Firecheck Coreboard, outertwo layers 12.5mm Lafarge Firecheck wallboard or 12.5mmLafarge Megadeco wallboard




Studs: 90mm wide Cormet CHS90/B Studs at 600mmcentres

Boarding: Inner 25mm Lafarge Firecheck Coreboard,outer two layers 12.5mm Lafarge Firecheck wallboard or12.5mm Lafarge Megadeco wallboard




43 4.4 88 90 46

42 4.4 88 90 40

43 6.4 118 90 45

44 6.4 118 90 52


RCS 103



47 7.5 175 90 50




47 7.5 175 90 52


Soun

d in

sula

tion

(dB

) R w

Performance tables







221

5

Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6

Soun

d in

sula

tion

(dB

) R w

RCS 110

RCS 206


Boarding: Inner 25mm Lafarge Firecheck Coreboard, outertwo layers 15mm Lafarge Firecheck wallboard or 15mmLafarge Megadeco wallboard









46 4.8 95 120 47

45 4.8 95 120 41

47 6.7 120 120 47

48 6.7 120 120 54


RCS 109



51 8.0 180 120 51




52 8.0 180 120 54






222



Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6

Soun

d in

sula

tion

(dB

) R w

RCS 904

RCS 905







47 3.6 123 90 47

42 2.5 95 90 41

51 4.2 180 90 51


RCS 901

Cormet Shaftwall may be installedhorizontally to provide an economical fireprotection system for ducts, corridors andother ceilings and stairway soffits. 60, 90and 120 minute fire protection can beprovided.

Such systems are not designed to carry liveloads or mechanical equipment, nor toprovide material storage areas.

Provision and sighting of warning noticesshould be considered.

Horizontal metal ducts require additionalprotection for fire from either inside oroutside the ducts. Refer to table 5.4 above.

The adjacent diagrams show typicalinstallation details for Cormet HorizontalMetal Duct Systems.

Cross section through horizontalmetal duct enclosure – 90 minute

Table 5.4 Cormet Shaftwall: horizontal metal duct enclosure


Note: For 120 minutes fire resistance add 1 x 15mm Lafarge Firecheck wallboard and Cormet Ceiling Channels MFCC50 at 400mm centres to the systems shown



Maximum size dependson screw fixing andframing capacity

Duct surface


Cormet CH Studsat 600mm centres

Cormet J Track

Cormet MFCC50 Ceiling Channels at400mm centres as fixing for boards

Cross section through horizontalmetal duct enclosure – 120 minute



Horizontal Shaftwall assemblies



25mm LafargeFirecheckCoreboard

CormetMFCE26 EdgeChannel


Cormet J Track

Maximum size dependson screw fixing and

framing capacity

Duct surface



CormetMFCE26 EdgeChannel



223

5

Performance tables

Wei

ght

(kg/

m2 )

Max

imum

hei

ght*

(m)

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6 an

d BS

EN13

64So

und

insu

lati

on (

dB)

R w

RCS 504

RCS 505


Core: 25mm Lafarge Firecheck Coreboard

Boarding: One layer 12.5mm Lafarge Firecheck orMegadeco wallboard both sides



Boarding: One layer 12.5mm Lafarge Firecheck orMegadeco wallboard both sides

Insulation: minimum 25mm glass mineral wool density16 kg/m3



Boarding: Inner 12.5mm Lafarge Firecheck or Megadecowallboard, outer two layers 12.5mm Lafarge Firecheck orMegadeco wallboard

43 4.5 88 120 44

90

42 4.5 88 120 40

90

54 5.4 101 120 43

120


RCS 503

Table 5.5 Cormet Shaftwall: stairwell systems





224

F I R E P R O T E C T I O NCORMET COLUMN AND BEAM CLIP SYSTEM


Performance tables

Table 5.6 Section factor Hp/A for Universalbeams with box encasement

Size of Mass per Section factorsteelwork metre Hp/A

(mm) (kg) 3 sides m-1 4 sides m-1

914 x 419 388 45 55

343 50 60

914 x 305 289 60 65

253 65 75

224 75 85

201 80 95

838 x 292 226 70 80

194 80 90

176 90 100

762 x 267 197 70 85

173 80 95

147 95 110

686 x 254 170 75 90

152 85 95

140 90 105

125 100 115

610 x 305 238 50 60

179 70 80

149 80 95

610 x 229 140 80 95

125 90 105

113 100 115

101 110 130

533 x 210 122 85 95

109 95 110

101 100 115

92 110 125

82 120 140

457 x 191 98 90 105

89 100 115

82 105 125

74 115 135

67 130 150

457 x 152 82 105 120

74 115 130

67 125 145

60 140 160

52 160 180

406 x 178 74 105 125

67 115 140

60 130 155

54 145 170

406 x 140 46 160 185

39 190 220

356 x 171 67 105 125

57 125 145

51 135 165

45 155 185

356 x 127 39 170 195

33 195 225

305 x 165 54 115 140

46 130 160

40 150 180

305 x 127 48 125 145

42 140 160

37 155 180

305 x 102 33 175 200

28 200 225

25 225 260

254 x 146 37 140 170

31 160 200

254 x 102 28 170 200

25 190 220

22 215 250

203 x 133 30 145 180

25 165 210

203 x 102 23 175 210

172 x 102 19 190 230

152 x 89 16 190 235

127 x 76 13 195 240

Table 5.7 Section factor Hp/A for Universalcolumns with box encasement



356 x 406 634 15 20

551 20 25

467 20 30

393 25 35

340 30 35

287 30 45

235 40 50

202 45 60

356 x 368 177 50 65

153 55 75

129 65 90

305 x 305 283 30 40

240 35 45

198 40 50

158 50 65

137 55 70

118 60 85

97 75 100

254 x 254 167 40 50

132 50 65

107 60 75

89 70 90

73 80 110

203 x 203 86 60 80

71 70 95

60 80 110

52 95 125

46 105 140

152 x 152 37 100 135

30 120 160

23 155 205

Table 5.8 Section factor Hp/A for steel joistswith box encasement



254 x 203 81.85 70 90

254 x 114 37.20 130 155

203 x 152 52.09 85 105

152 x 127 37.20 90 120

127 x 114 29.76 100 130

127 x 114 26.79 110 140

114 x 114 26.79 100 135

102 x 102 23.07 105 140

89 x 89 19.35 105 145

76 x 76 12.65 140 185

The higher the Hp/A the higher the degree ofprotection required.

For sections not included on this page, refer tothe Association for Specialist Fire Protection(ASFP) Yellow book or go to www. asfp.org.ukor contact Lafarge Technical Enquiryline office.



225

5

Performance tables

To calculate the thickness of LafargeFirecheck, Lafarge Megadeco orLafarge Firecheck Coreboardnecessary, calculate the Hp/A for thesteel to be protected, refer to tables5.6 to 5.8 opposite, and use thecharts below to look up theappropriate thickness of Lafargewallboard and the Cormet systemthat provides the suitable level offire protection required.

Refer to table 5.9 on page 226 forsystem details.

20

40

60

80

100

120

140

160

180

200

220

240

260

280

30 60 90 120 180

Fire resistance (minutes)

Sect

ion

fac

tor

Hp

/A (

m-1

)

20

40

60

80

100

120

140

160

180

200

220

240

260

280

30 60 90 120 180

Fire resistance (minutes)

Sect

ion

fac

tor

Hp

/A (

m-1

)

12.5 RCE01

12.5 RCE01

30 RCE05

25 RCE03

40 RCE06

50 RCE07

40 RCE06

25 RCE03

15 RCE02

12.5 RCE01

12.5 RCE01

30 RCE05

25 RCE03

40 RCE06

50 RCE07

40 RCE06

25 RCE04

15 RCE02

15 RCE02

25 RCE04

230

185

140

105

130

118

180

50

8575

Lafarge Firecheck, Firecheck Coreboardand Megadeco to columns

Lafarge Firecheck, Firecheck Coreboardand Megadeco to beams


Worked example

Beam that will be encased on 3 sides and requires 60 minute fire rating.

Beam section: 457 x 152mm x 60 kg/m

Calculate Hp/A value: From table 5.6, equals 140 Hp/A m-1 (based on 3 sided encasement)

System selection: From the charts detailed above, the system required is the Lafarge reference RCE01, which is one layer of 12.5mm Lafarge Firecheck or 12.5mm Lafarge Megadeco.

See performance table 5.9 for complete system specification on page 226.

226



Performance tables

RCE 01

RCE 02

Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CB Clipspositioned at 600mm centres

Boarding: one layer 12.5mm LafargeFirecheck wallboard or 12.5mmLafarge Megadeco wallboard, cornersreinforced with Lafarge Tape-On 90ºCorners

Fire resistance: columns

30 minutes up to 280 Hp/A factor


Fire resistance: beams



Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CB Clipspositioned at 600mm centres

Boarding: one layer 15mm LafargeFirecheck wallboard or 15mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On 90ºCorners






Table 5.9 Cormet Column and Beam Clip System


RCE 03 Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CB Clipspositioned at 600mm centres

Boarding: inner layer 12.5mmLafarge Firecheck wallboard, outerlayer 12.5mm Lafarge Firecheckwallboard or 12.5mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On 90ºCorners






RCE 05

RCE 06

Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: inner layer 15mmLafarge Firecheck wallboard, outerlayer 15mm Lafarge Firecheckwallboard or 15mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On90º Corners





Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: inner layer 25mmLafarge Firecheck Coreboard, outerlayer 15mm Lafarge Firecheckwallboard or 15mm LafargeMegadeco wallboard, cornersreinforced with Lafarge Tape-On90º Corners








RCE 07 Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: two layers 25mmLafarge Firecheck Coreboard,corners reinforced with LafargeTape-On 90º Corners





To determine the necessary thicknessof Lafarge Firecheck, LafargeFirecheck Coreboard or LafargeMegadeco, calculate the Hp/A forthe steel to be protected (see tables5.6 to 5.8 on page 220), and use thecharts on the previous page to lookup the appropriate Lafarge systemreference for the level of fireresistance required.

Note: The Deco system is not suitable for plastering. Refer to Section 7 for finishing details.

RCE 04 Framing: Cormet Edge ChannelsMFCE26 attached to Cormet CBClips positioned at 600mm centres

Boarding: one layer 25mm LafargeFirecheck Coreboard, cornersreinforced with Lafarge Tape-On90º Corners





5The Cormet Shaftwall systemprovides up to 120 minutes fireprotection to lift shafts whilst alsoaccommodating high windloadings.

These characteristics also make itideally suited to use in lining anddividing large industrial orwarehouse spaces and meetingBuilding Regulations fireresistance requirements wheresuch premises are within 1 metreof an adjacent property.


F I R E P R O T E C T I O NCORMET SHAFTWALL

227

5

228



Introduction

Cormet ShaftwallCormet Shaftwall is a highperformance fire protection systemfor the enclosure of shafts in multi-storey buildings. These may includestairwells, lift shafts, service ductsand ventilation/air conditioningducts. Cormet Shaftwall can also beused as a high performanceindependent wall lining systemproviding high levels of fireprotection and sound insulation.Erected from one side only fireresistance is provided to both sidesof the lining. Cormet Shaftwall canprovide up to 120 minutes fireresistance in these applications.

Shaftwalls are non-loadbearingassemblies, installed betweenstructural floors and designed toallow erection from outside theshaft, thus removing the need forscaffolding. Their all-dryconstruction makes them faster toerect and much lighter in weightthan masonry construction.

The Cormet Shaftwall systemcomprises a small range ofcomponents, enhancing speed andsimplicity of erection using normaldrywall methods. The assembly alsoprovides a cavity in which servicescan be run.

Cormet Shaftwall has goodstrength, impact resistance andstiffness. Lift shaft walls are subjectto varying positive and negativepressures as lifts ascend anddescend. The Cormet Shaftwallsystem has been shown by tests tohave the ability to withstand thesepressure changes. Using LafargeIntumescent Acoustic Sealant theconstruction resists air pressuresurges of up to 720 N/m2, minimisingwhistling noise and dirtaccumulation in and around liftshafts.

Performance

Refer to performance tables 5.1 to 5.5.

Lafarge plasterboards andcomponents are defined as Class 0 in accordance with National BuildingRegulations 1991 ApprovedDocument B1/2/3/4/5 Fire Safety and Building Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1987 and Euroclass A2.Cormet metal sections and Lafargegypsum based jointing compoundsare non-combustible when tested inaccordance with BS 476: Part 4: 1970 and Euroclass A1.

Cormet E Studat end

CormetCH Stud


CormetJ Track

Facing layers of LafargeFirecheck or LafargeMegadeco wallboardaccording to specificationand fire resistance required(see performance tables)

25mm glassmineral woolwhere required

Room side

Typical Shaftwall construction



229

5

Components

Table 5.10 Metal componentsCormet CH Studs Description Code reference Metal thickness (mm) Lengths (mm)

CHS60/B 0.70 3000, 3600, 4800

CHS90/B 0.70 4800, 6600

CH146/B 0.70 6000, 8000

Cormet E Studs Description Code reference Metal thickness (mm) Lengths (mm)

ES60/B 0.70 3000, 3600, 4800

ES90/B 0.70 4800, 6600

ES146/B 0.70 6000, 8000

Cormet J Tracks Description Code reference Metal thickness (mm) Lengths (mm)

JT62/B 0.70 3000

JT92/B 0.70 3000

JT148/B 0.70 3000

Cormet J Tracks arelightweight steel sectionspositioned at floor and soffitto guide CH Studs.

Cormet CH Studs arelightweight, non- loadbearingsteel sections which areinstalled between core boardsto provide the bearing surfaceto which wallboard is applied.They have 25mm cutouts toaccommodate service runs.

Cormet E studs are lightweightsteel sections used as starterstuds, intersections, dooropenings and end studs.

35

25

60 90 146

25

25

60 90 146

50

25

62 92 148

CormetCH StudCHS60/B



CormetE StudES60/B

CormetE StudES90/B

CormetE StudES146/B

CormetJ TrackJT62/B

CormetJ TrackJT92/B

CormetJ TrackJT148/B

35

230



Application details

System Assembly

Metal frame and Coreboard

In steel frame construction, tracksand studs are installed beforesteelwork is treated with fireprotective coating. Any fireprotective coating on CormetShaftwall components should beremoved before the boards arefixed.

Apply a 6mm bead of LafargeIntumescent Acoustic Sealant alongthe back of the Cormet J Tracks.Position the Cormet J Track on floorand soffit with the long leg on theshaft side. Securely fix Cormet JTracks with suitable fixings at300mm centres.

Cut Cormet E Studs 20mm less thanthe floor to ceiling height and applya 6mm bead of Lafarge IntumescentAcoustic Sealant along the fulllength. Position Cormet E Studs inthe Cormet J Tracks with the narrowflange of the Cormet E Stud facingthe shaft side. Securely fix Cormet EStuds with suitable fixings at300mm centres.

Cut Lafarge Firecheck Coreboard25mm less than floor to ceilingheight. Position the first Coreboardvertically in the Cormet J Track andinside the web of the Cormet EStud, leaving the 25mm gap at thetop of the board.

Cut Cormet CH Studs 9 to 12mm lessthan floor to ceiling height. PositionCormet CH Studs in the Cormet JTrack and fit firmly over the trailingedge of the Coreboard already inposition.

Insert the next Lafarge FirecheckCoreboard into the Cormet CH Stud.Repeat this process until the lastCoreboard is reached.

Place one Cormet E Stud over thetrailing edge of the last Coreboard.Apply a 6mm bead of LafargeIntumescent Acoustic Sealant alongthe full length of the web of theCormet E Stud. Snip the short leg ofthe Cormet J Track and bend flat toallow the board to be inserted.Insert the Coreboard at an angleinto the Cormet CH Stud.

Position Lafarge FirecheckCoreboard and Cormet E Stud in theCormet J Track and securely fixCormet E Studs to the structure withsuitable fixings at 300mm centres.

Bend the leg of the Cormet J Trackback into vertical position.

Vertical section 25

100

25mm gap at top ofCormet stud

25mm LafargeFirecheck Coreboard

Cormet J Track

Shaft sideRoom side


Lafarge Firecheckwallboard as required

Start wall detail


Shaft side

Room side

CormetCH Stud

Cormet JTrack

CormetE Stud

25mm LafargeFirecheck Coreboard

End wall detail

Shaft side

Room sideLafarge IntumescentAcoustic Sealant

Last Firecheck Coreboardand Cormet E Stud beinginserted

Cormet J Track short legsnipped and bent flat toallow board to be inserted


Cormet J Track


At the head, install fire stops of100mm deep Lafarge FirecheckCoreboard in between the verticalCormet Studs. Butt the FirecheckCoreboard tightly against theCormet J Head Track and screw fixthe Coreboard infill through the

100mm infill of 25mmLafarge FirecheckCoreboard to maintainfire protectionperformance

inner layer of Lafarge FirecheckCoreboard and into the Cormet JTrack using Lafarge 57mm SelfTapping Drywall Screws. Apply 6mmbead of Lafarge IntumescentAcoustic Sealant at the junction ofthe Coreboard and Cormet J Track.



231

5

Application details

5

Table 5.11 Limiting height (mm)Lafarge Cormet Allowable Air Pressure N/m2 system system reference* deflection** 240 360 480 720

RCS 102, 106 L/120 5400 4700 4200 3500

L/240 4300 4300 3400 2900

L/360 3700 3200 2900 2500

RCS 103, 104, 109, 110 L/120 6000 4900 4200 3500

L/240 4700 4100 3800 3200

L/360 4100 3800 3200 2800

RCS 203, 208 L/120 6700 5500 4700 3400

L/240 5300 4600 4200 3400

L/360 4600 4000 3700 3200

RCS 205, 206, 210 L/120 6900 6000 5500 4100

L/240 5500 4800 4400 3800

L/360 4800 4100 3800 3300

RCS 302, 303 L/120 8500 7600 5800 4400

L/240 8200 7200 4800 4400

L/360 7300 6400 5200 4100

* Refer to tables 5.1 to 5.5 for specification of systems

** L = partition height in mm

Install full height Cormet E Studsvertically at all corners, walljunctions and door jambs.

Where the floor to ceiling heightexceeds the maximum availableCoreboard length, reinforcehorizontal joints in Coreboard withhorizontal Cormet CH Stud sectionsor using 100mm infill packer pieceof 25mm Lafarge FirecheckCoreboard. Ensure that horizontaljoints occur only within the top andbottom thirds of the wall heights.Stagger joints in adjacent panels.See drawing below.

Limiting heights

See table 5.11.

Plasterboard

For single layer systems installplasterboard with long edgesvertical, from the room side, fixingto studs and tracks with 25mmLafarge Drywall Screws. Spacescrews at 200mm centres at verticaledges of boards and 300mm in thecentre of boards.

Stagger screws 100mm relative tothose in adjacent board.

For double layer systems install thefirst layer as for single layer systems.Apply the second layer over the firstlayer with long edges vertical andjoints staggered. Fix with 41mmLafarge Drywall Screws at the samecentres as the first layer, with screwsstaggered relative to those in thefirst layer.

Overheight Shaftwall – option 1 Elevation of Shaftwall partition over 3m high

Where wall heightexceeds LafargeFirecheck Coreboardheight, reinforce jointswith horizontallengths of Cormet CHStud between verticalstuds.

2/3rdmaximumheight

1/3rdmaximumheight

Noggingsstaggered inadjacentpanels

Overheight Shaftwall – option 2


Where wall heightexceeds LafargeFirecheck Coreboardheight, reinforce jointswith horizontallengths of 100 x 25mmLafarge FirecheckCoreboard fixed with44mm Lafarge DrywallLaminating Screwsbetween vertical studs.


232



Application details

Corners

Inside

Ensure continuity of Lafarge FirecheckCoreboard by securing a cut lengthof Lafarge Firecheck Coreboard toouter web of the Cormet E Stud.

Outside

Position Cormet E Studs at rightangles to each other. Insert LafargeFirecheck Coreboards, then secureCormet E Studs together with 25mmLafarge Self Drilling Drywall Screwsat 600mm centres.

Wall junction

Reinforce outer plasterboardsabutment with Cormet Metal Angle.

Ensure that a Cormet CH Studcoincides with the junction. Screwfix Cormet E Stud to Cormet CHStud at 600mm centres usingLafarge Drywall Screws.

Inside corner

Outside corner

Lafarge Firecheck Coreboard fixedto outside of Cormet E Stud

Cormet E Studs fixedtogether to support corner

Lafarge Firecheckwallboards

Lafarge FirecheckCoreboard

Cormet E Studsfixed togetherto supportcorner

Lafarge Firecheck wallboard

Wall junction, room side

Wall junction, shaft side

Lafarge Firecheck Coreboard

LafargeFirecheckwallboards

CormetE Stud

CormetCH Stud


CormetE Stud


CormetCH Stud




233

5

Application details

Duct penetrations

Where Cormet Shaftwall ispenetrated by ducts, maintain thefire integrity of the Shaftwall withcut strips of 25mm Lafarge FirecheckCoreboard. Use Cormet J Track tosupport the framing as required.

The duct must be independentlysupported so the weight is nottransferred to the Cormet Shaftwallpartition.

Elevation from room sideCormet CH Studs at 600mm centresCormet J Track

Duct opening

Cormet J Trackwith Cormet CHStud insert tosupport framing

Metal sectionsjointed with panhead screws onboth sides Cormet J Track

Duct penetration section Duct penetration plan

LafargeFirecheckCoreboard

Shaft side Room side

Duct or serviceopening

CormetJ Track

CormetCH Stud


Exploded detail of wall at duct penetration

Shaft side

Room side


Duct or service opening

Cormet J Track

Cormet CH Stud


Cormet J TrackCormet CH Stud

Ductedge

234



Application details

Junctions with structural steelwork

Care should be taken to ensure thatthe fire integrity of the CormetShaftwall is maintained at junctionswith structural steelwork.

Corner column bypass


CormetE Stud

Cormet E Stud

Cormet CB clip

Lafarge Firecheck wallboards

Column bypass


CormetE Stud

CormetE Stud

CormetCB clip

Lafarge Firecheck wallboards

Steel beam, offset wall Steel beam

CormetEdgeChannel

CormetCB clip

CormetJ Track



Cormet E Studfixed toCormet EdgeChannel

Cormet EdgeChannel

CormetCB clip

Cormet E Studfixed to CormetFixing Channel orCormet Flat Strap



Cormet FixingChannel orCormet FlatStrap fixed toCormet EdgeChannel at600mm verticalcentres

LafargeFirecheckCoreboard

CormetEdgeChannel

CormetEdgeChannel



235

5

Application details

Movement control joint

Movement control joints arerequired at 10 metre intervals orwhere the assembly abuts or crossesa structural movement joint.

At movement joints leave a 12.5mmgap in the Cormet Shaftwall, andcap each end of Lafarge FirecheckCoreboard with a Cormet E Stud.Apply Lafarge Intumescent AcousticSealant in the gap between the Cormet E Studs. Attach CormetMovement Control Joint to theouter layer of plasterboard with13mm stainless steel staples at150mm centres.

Corridor ceilings and stair soffits

At abutments with metal studpartitions, secure Cormet J Trackthrough plasterboards and intometal studs using Lafarge DrywallScrews at 600mm centres.

At abutments with masonry secure Cormet J Track with suitable fixingsat 300mm centres.

Stairwells

For stairwells or other areas where aflush jointed finish is required onthe shaft side, one layer ofplasterboard can be transferredfrom the room side to the shaft side– see table 5.5. Apply this layer overLafarge Firecheck Coreboard, screw-fixing to the exposed flanges of theCormet CH Studs.

Movement control joint (plan)

Rock mineralwool Insulation



Cormet E Studs


Lift door jamb (plan)

Cormet E Studs spot-welded to lift door frameat 300mm centres

25mm Lafarge Firecheck Coreboard

Lining continuedaround Cormet E Studs

120 minute fire resistant ceilingand partition junction detail(vertical section)

Cormet120 minutefire ratedpartition

Corridorceiling void


Two layers 15mmLafarge Firecheckwallboard

Cormet FixingChannel or CormetFlat Strap

Stairwell wall detail (plan)

Cormet E StudsLafarge Firecheckwallboard


Lafarge Firecheckwallboard

Stairwell

Room side


Cormet E Stud





Lift shaft door head(framing only)

Cormet E Studs


Lafarge Wafer HeadSelf Drilling Screws

Cormet J Track(deep leg to front)

236




Cormet Shaftwall System

Scope

A non-loadbearing, highperformance fire protection systemfor the enclosure of shafts in multi-storey buildings where access canonly be gained from one side. Thesemay include stairwells, lift shafts,service ducts and ventilation/airconditioning ducts. The system canalso be used as independent walllinings where a high degree of fireresistance is a requirement.

The selection of studs and the type,number and thickness ofplasterboard layers will depend onthe partition height and theperformance required for fireresistance and sound insulation. Allframing components comprise ofhot dipped galvanised steel to BS EN10143:1993 and BS EN 10142: 1990.

Additional Clauses






NBS clauses



System reference (Insert Lafarge system reference from the Performance tables)

Location ........................


PerformanceMaximum height ...........m

Fire rating ..........mins (Insert information from Lafarge system reference)

Airborne insulation ..........dB (Insert information from Lafarge system reference)

Thickness ..........mm (Insert information from Lafarge system reference)

Damp proof courseInstall ..... mm wide damp proof course ..... by .....

Floor and head tracksCormet J Track, reference (JT62/B, JT92/B or JT148/B) to BS 7364: 1990, fixed at maximum 300mm centres to substrate using proprietary fixings.

StudsCormet CH Studs, reference (CHS62/B, CHS92/B or CHS148/B) to BS 7364:1990,at ......mm centres.

End studsCormet E Studs, reference (ES62/B, ES92/B or ES148/B) to BS 7364: 1990, fixedat maximum 300mm centres to abutments using suitable proprietary fixings.

Support to horizontal jointsCormet MFIX Channel fixed to faces of studs to support boards alonghorizontal joints in [outer layer of] boards.

NoggingsCut lengths of Cormet CH Stud, reference (CHS62/B, CHS92/B or CHS148/B)to fit between vertical studs at horizontal joints between Coreboards. Stagger noggings between adjacent panels.

InsulationFit ...... mineral wool insulation by ......, thickness ......mm.

BoardingCore board of Lafarge Coreboard, 25mm thick.

Boarding to room side of framework:

Inner layer Lafarge Firecheck wallboard, ........mm thick.

Outer layer Lafarge (Firecheck wallboard, Megadeco), ........mm thick. Allboard joints to be staggered between layers.

Boarding to stairwell side:

Layer of Lafarge (Firecheck wallboard, Megadeco), 12.5mm thick.

Fixings (repeat for all layers of wallboard as required)Lafarge Drywall Screws at 300mm centres.

Type, Drywall Self Tapping or Megadeco Self Tapping






Finished lining toleranceFinished system to comply with tolerances in BS 8212: 1995, section 3.3.

InstallationAll materials unless otherwise indicated shall be supplied by Lafarge Plasterboard Ltd, and shall be installed in accordance with theircurrent literature and in accordance with BS 8212: 1995.

Notes:



The Cormet CB clip EncasementSystem allows drywall techniquesto be used to provide fireprotection up to 180 minutes tostructural steel columns andbeams.

The system is fast and efficient,avoids the need for intumescentpaints and sprays and provides asmooth, flat surface allowing highstandards of decoration to beachieved.

From factories to call centres andprestige public buildings, Lafargeencasement systems provide theeffective, high performancesolution.



237

5

Application details

238



Introduction

Cormet Column and BeamClip systemThe Cormet Column and Beam Clipsystem is a high performance systemproviding fire protection tostructural steel I section columnsand beams. Systems have beentested and shown to provide up to180 minutes fire resistance.

The Cormet Column and Beam Clipsystem has been designed toenhance speed and simplicity ofinstallation using normal drywallmethods. No special installationtechniques are required.

The system features a special clipmanufactured from 0.55mm mildsteel, cold formed and protected bya hot dip galvanised zinc coating.Used with Cormet Metal Angles andChannels this provides a strong, rigidmetal structure to which LafargeFirecheck, Firecheck Coreboard orMegadeco board is applied.

Completed column and beam liningsprovide a strong, impact resistant,smooth surface which accepts mosttypes of decoration and makes thesystem particularly suitable for usein conjunction with plasterboardlined metal stud partitions andceilings. Common materials andfixings allow increased site efficiencyand considerable time saving overtraditional methods.

Performance

Fire resistance

Lafarge plasterboards andcomponents are defined as Class 0 inaccordance with National BuildingRegulations 1991 ApprovedDocument B1/2/3/4/5 Fire Safety andBuilding Standards (Scotland)Regulations 1990, Regulation D2when tested to BS 476: Part 6: 1989and Part 7: 1987. Cormet metalsections and Lafarge gypsum basedjointing compounds are non-combustible when tested inaccordance with BS 476: Part 4: 1970and Euroclass A1.

Impact resistance

For columns situated in heavy trafficareas, Lafarge Firecheck Coreboardor Lafarge Megadeco can besubstituted for Lafarge Firecheck toprovide a lining which is moreresistant to impact damage.

Typical steel column encasement: double boarded

Typical steel beam encasement: double boarded

Cormet Edge Channel

Cormet CB Clips at600mm centres

Stagger plasterboardjoints between layers by300mm

Cormet Edge Channel

Cormet CB Clips at600mm centres

Stagger plasterboardjoints between layersby 300mm

Cormet Metal Anglefixed to soffit withfixing appropriate tosubstrate, asrecommended by fixingmanufacturer

Cormet Flat Strap

Cormet Flat Strap



239

5

Components

Table 5.12 Metal componentsCormet CB Clip Description Code reference To fit flange size (mm)

CB 17 7-17

CB 27 17-27

CB 40 27-40

Cormet Edge Channel Description Code reference Length (mm)

MFCE 26 3600

Cormet Metal Angle Description Code reference Length (mm)

MFC 2330 3600

Cormet Fixing Channel Description Code reference Length (mm)

MFIX 2400

Cormet Flat Strap Description Code reference Length (mm)

FS50/R 2400

FS90/W 2400

Lafarge Drywall Plasterboard Screw length

Self Tapping Screws Construction thickness (mm) (mm)


15 25

25 38


15.0 + 15.0 41

15.0 + 25.0 51

25.0 + 25.0 63

Firecheck Description Thickness (mm) Width (mm) Length (mm)

12.5 900 1800

1200 2400, 2700, 3000, 3600

15.0 1200 2400, 2700, 3000

Megadeco Description Thickness (mm) Width (mm) Length (mm)

12.5 1200 2400, 2700, 3000

15.0 1200 2400, 2700, 3000

Firecheck Coreboard Description Thickness (mm) Width (mm) Length (mm)

25 600 3000

Cormet CB clips are lightweightsteel clips friction fitted at theflange of columns and beams toprovide main fixing for edgechannels. Three sizes of CB clipare available to accommodatedifferent column and beam sizes. 17 27

40

Cormet Edge Channels arelightweight steel sections frictionfitted to CB clips to providemetal support and bearingsurfaces for plasterboard.

28

26

19

30

23

Cormet Metal Angles arelightweight steel sectionspositioned at column/beam andsoffit abutments to providefixing surfaces for plasterboard.

The table gives therecommended screw lengths forsingle and double layerplasterboards

A fire resistant, sound and impactresistant pre-sealed plasterboard.

A high strength fire resistantplasterboard with a green dyedliner for identification. It ismoisture resistant and hassquare edges.

A fire resistant plasterboard withone face coloured pink for easeof identification. It is availablewith tapered and square edges.

Galvanised metal channel usedto provide support forplasterboard joints and heavyfixtures 99

6

Galvanised metal flat strap toprovide support for plasterboardjoints. Also provides a fire stop

50 90

240



Application details

Cormet Edge Channel, providing 26mmcavity, pressed into Cormet CB Clips

One layer screw-fixed to Cormet EdgeChannels at 300mm maximum centres

Corners reinforced with LafargeTape-On 90º Corners

Cormet CB clips positioned at 600mmmaximum centres

Cormet Edge Channel pressed into clips

Two layers, joints staggered by 300mmand screw-fixed to Cormet EdgeChannels at 300mm maximum centres


Cormet CB clips positioned at 600mmmaximum centres

Column encasement: single layer

Column encasement: double layer

Cut-away column elevation: double layer

Two layers Firecheck wallboardstaggered and screw fixed to CormetEdge Channels at 300mm maximumcentres

Cormet Edge Channel pressed intoCormet CB Clips

Cormet CB Clips positioned at 600mmcentres


Cormet MFIX Fixing Channel fixedwith Lafarge Wafer Head Screws toCormet Edge Channel on a singleboard system. Cormet Flat Strap(shown) between board layers ondouble board systems.



241

5

Application details

Column encasement: partition abutment

Column encasement: junction with masonry wall

Cormet EdgeChannel pressed intoCormet CB Clips

Corners reinforced withLafarge Tape-On 90º Corners

Cormet CB Clipspositioned at600mm maximumcentres

Cormet C Stud

Two layers screw-fixed toCormet Edge Channels at300mm centres

Cormet Metal Angle

Masonry wall

Two layers Firecheckwallboard screw-fixed toCormet Edge Channels at300mm centres

Cormet CB Clips positionedat 600mm maximum centres

Cormet EdgeChannel pressedinto clips

Corners reinforcedwith Lafarge Tape-On 90º Corners


Fixing appropriateto substrate

Cormet MFIX or CormetFlat Strap between boardlayers on double boardedsystems at 600mm verticalcentres fastened to edgechannels with LafargeWafer Head Screws

Lafarge IntumescentAcoustic Sealant Lafarge Intumescent

Acoustic Sealant

242



Application details

Beam encasement: partition abutment

Cormet Edge Channel pressed intoCormet CB Clips


Cormet CB Clips positioned at600mm maximum centres

Cormet U Track

Two layers Firecheck wallboardscrew-fixed to Cormet EdgeChannels at 300mm centres

Cormet Metal Angle fixed to soffitwith fixing appropriate to substrate,as recommended by fixingmanufacturer

Cormet Edge Channel pressedinto Cormet CB Clips

Cormet CB Clips positioned at600mm maximum centres

Cormet Metal Angle fixed to soffitwith fixing appropriate to thesubstrate, as recommended by fixingmanufacturer

Two layers staggered by 300mm andscrew fixed to Cormet Edge Channelsat 230mm centres, or 150mm at cutedgesCorners reinforced with

Lafarge Tape-On 90ºCorners (not shown for clarity)

Cormet MFIX Fixing Channel fixed to Cormet EdgeChannel with Lafarge Wafer Head Screws for singleboard systems. Cormet Flat Strap (shown) betweenboards for double board systems

Cut-away beam elevation: double layer

Lafarge Intumescent AcousticSealant

Cormet MFIX FixingChannel at 600mmcentres fastened toCormet Edge Channelwith Lafarge WaferHead Screws or CormetFlat Strap betweenboard layer on doubleboard systems



243

5

Installation

Metal frame

Fiction-fit Cormet CB Clips to all freeedges of the flanges on the columnor beam, starting at a distance of150mm from the end of thecolumn/beam, spaced at 600mmcentres, and with the long leg of theclip on the inside of the flange.

Install Cormet Edge Channels alongeach of the flange edges by tappingthe short leg of the Cormet EdgeChannel into the Cormet CB Clips.

Where a column/beam abuts a wallor other structure install CormetMetal Angles, positioned with thelong leg hard against thecolumn/beam flange. Fix the shortleg to the structure with suitablefixings at 600mm centres.

For beams up to 300mm deep noreinforcement is required to supportthe plasterboard.

Where any face exceeds 300mm thevertical joints in the plasterboardmust be supported by Cormet FixingChannel (in double boarded systemssupport outer layer only withCormet Flat Strap between boardlayers).

Where any face exceeds 600mmCormet Fixing Channel must beprovided at maximum 600mmcentres and to coincide with boardedges.

Plasterboard

For single layer systems installplasterboard to Cormet FixingChannels or Cormet Metal Anglewith Lafarge Drywall Screws at300mm centres.

For multi layer systems, install thefirst layer as for single layer systems.Apply the further layers over thefirst with joints staggered by 300mmminimum. Fix with Lafarge DrywallScrews at 300mm centres.

Reinforce all external corners withLafarge Tape-On 90º Corners.

Cormet MFIXFixing Channelfixed to MFCE 26or MFC2330 usingLafarge WaferHead Screws

Steelwork 300-600mm deep

300 to600mmdepth

2400mm or to suitboard length andnumber of board layers

Cormet MFIXFixing Channel orCormet Flat StrapFS90/W fixed toMFCE 26 orMFC2330 usingLafarge WaferHead Screws

Steelwork over 600mm deep

Over600mmdeep

600mm

600mm

244



Cormet Column and BeamClip System

Scope

Fire resisting encasements to steelbeams and columns with maximumHp/A factor of 260/m using LafargeFirecheck plasterboards or LafargeMegadeco supported on Cormetlightweight metal framing.

Additional Clauses






NBS clauses




Location ........................


PerformanceFire rating ..........mins (Insert information from Lafarge system reference))

Thickness ..........mm (Insert information from Lafarge system reference)

Metal framing componentsFraming components to be hot dip galvanised steel to BS EN 10143: 1993 andBS EN 10142: 1990 and Approved Document A1: 1995 designated DX51D andZ275 NAO. Sections rolled to BS 2994: 1987.

FramingCormet CB Clips, reference (CB17, CB27, CB40) at 600mm centres along flangeswith Cormet Edge Channel MFCE 26 and Cormet MFC2330 Metal Angles.

Support to lateral board edgesCormet Fixing Channel, reference MFIX or Cormet Flat Strap FS50/R or FS90/W at ..........mm centres (to coincide with lateral board edges).


Inner layer (Specify wallboard from the Performance tables)

Outer layer (Specify wallboard from the Performance tables)


FixingsLafarge Drywall Screws at 300mm centres.

Type, Drywall Self Tapping or Megadeco Self Tapping





Lafarge Predeco taping and jointing system.

Corners reinforced with Lafarge Tape-On 90º corners.

Finished lining toleranceFinished system to comply with tolerances in BS 8212: 1995, section 3.3.

InstallationAll materials unless otherwise indicated shall be supplied by Lafarge Plasterboard Ltd, and shall be installed in accordance with theircurrent literature and in accordance with BS 8212: 1995.


Notes:




F I R E P R O T E C T I O NWHAT CAN GO WRONG CHECKLIST

245

5

Installation

Friction fit all theCormet CB Clips onto the web of thesteel at 600mmmaximum verticalcentres.

Completely install allthe Cormet CB Clipsand Cormet EdgeChannels beforestarting the fixing ofwallboards.

1

2

3

4

5

6

Install the CormetEdge Channel intothe flange of theCormet CB Clips bypushing the small legof the Cormet EdgeChannel into theCormet CB Clips.

For ease ofinstallation, anglethe Cormet EdgeChannel as shown.

Screw fix wallboardsat maximum 300mmcentres through thewallboards and intothe Cormet EdgeChannels usingLafarge Self TappingDrywall Screws.Ensure all wallboardjoints are supportedand install eitherCormet Flat Strap orCormet FixingChannel as required.

Ensure that theCormet EdgeChannels are fullypushed into theCormet CB Clips.

Reinforce the cornerswith Lafarge Tape-On 90º Corners andtape and joint asshown in Section 7.

246



Fire Protection Solutions

Items to check

For Cormet Shaftwall

1. Has Lafarge Intumescent Acoustic Sealant been applied to the back of theCormet J Tracks and E Tracks before fixing in position?

This is required to seal gaps and airpaths against smoke.

2. Have fire stops of 100mm deep Lafarge Firecheck Coreboard beeninserted and screwed in position at the head of the shaftwall?

This is required to close off the shaft side of the partition against fire.

3. Where two layers of plasterboard are used, are the joints staggered?

4. At inside corners has the steel frame been protected by a cut piece ofLafarge Firecheck Coreboard?

This is to maintain the fire performance of the partition.

5. Are movement joints provided at maximum 10m centres?

For Cormet Column and Beam Clip System

1. Are Cormet MFIX Fixing Channels (single layer systems) and Cormet FlatStraps (double layer systems) provided for fixing the plasterboard edges?

These are necessary for the integrity of the system.

2. Are the thickness and layers of plasterboards as specified to meet therequired fire resistance?

Depending on the mass of the steel section being protected, the board thicknesseswill vary even where the same level of fire protection is provided.


(✓ ) (✓ )

CREATIVE SOLUTIONS 6

248

C R E A T I V E S O L U T I O N SINTRODUCTION


ContentsPerformance tables 249

Fresco 251

Cove 261

Profiles 267

Contour Walls 281


Lafarge FrescoLafarge Fresco raised panelwallboards allow the traditionalappearance of panelled walls andceilings to be achieved economicallywith normal drylining techniques.

Lafarge Fresco panels can beinstalled on timber or Cormet metalframing in a similar way to standardplasterboard. They can also be directbonded to sound, dry backgrounds.

Lafarge CoveLafarge Cove is a simple and costeffective way of adding attractiveand distinctive features to the walland ceiling junction. Designed forinternal use Lafarge Cove cancomplement many room styles.

Lafarge ProfilesThe Lafarge Profile range ofarchitectural design products allowsfeatures once only possible with wetplaster and costly one-offcomponents to be achieved quicklyand economically.

The Lafarge Profiles range enablesthe designer to use plasterboard innew and more imaginative ways.

Lafarge Shadowline Profiles providemany opportunities for theintroduction of relief andarticulation to wall and ceilingsurfaces.

A softer approach is possible withLafarge Softform Profiles to createsmooth curves.

Contour WallsCurved wall surfaces, which oncerequired time-consuming wetplaster technology or expensivefibrous plaster mouldings, can nowbe formed with quick andinexpensive Lafarge drywall systems.Utilising the drywall advantage it isnow possible to create high qualitycurved plaster forms with standardwallboards and at the same timemeet tight time and cost restraints.

System selection

Selection criteria:

Overall Width mm 82 – 178 – – –

Fire Resistance minutes 60 – 120 – – –

Maximum Height mm 6200 – – –

Sound Resistance dB 39 – 46 – – –

Weight kg/m2 27 – 49 – – –


Residential: New Housing■ ■ ■ ■

Flats■ ■ ■ ■

Renovation■ ■ ■ ■

Commercial: Offices■

–■ ■

Entertainment■

–■ ■

Institutional■

–■ ■

Shops■

–■ ■

Industrial: Factories – – – –

Warehouses – – – –

Specials: Cinemas – –■ ■

Hospitals –■ ■ ■

Lafa

rge

Cove

Lafa

rge

Fres

co

Lafa

rge

Prof

iles

Cont

our

wal

ls

Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)*

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (

R wdB

)


C R E A T I V E S O L U T I O N S

249

6

Performance tables

FCP 01

FCP 02


Facings: one layer Lafarge Fresco wallboard both sides



Studs: 146mm Cormet C Stud (CS146/R) at 400mmcentres


Table 6.1 Typical Lafarge Fresco systems:Cormet Metal Stud partitions

27 2.7 82 30 37

30

29 3.8 102 30 38

30


FCP 03 30 6.2 178 30 41

30

FCP 04 Studs: 70mm Cormet C Stud (CS70/R) at 400mm centres

Facings: inner layer 12.5mm Lafarge Firecheckwallboard, outer layer Lafarge Fresco wallboard bothsides

49 4.6 127 120 48

90


Wei

ght

(kg/

m2 )

Max

imum

hei

ght

(m)*

Nom

inal

thi

ckne

ss (

mm

)Fi

re r

esis

tanc

e (m

inut

es)

to B

S 47

6, a

nd B

S EN

136

4So

und

insu

lati

on (

dB)

R w

250



Performance tables

Wei

ght

(kg/

m2 )

Fire

res

ista

nce

(min

utes

)

to B

S 47

6

Wei

ght

(kg/

m2 )

Fire

res

ista

nce

(min

utes

)

to B

S 47

6, a

nd B

S EN

136

5So

und

insu

lati

on a

irbo

rne

(dB)

Rw

Soun

d in

sula

tion

impa

ct

(dB)

Lnw

FTP 01 Timber studs: 63 x 38mm at 400mm centres


Table 6.2 Typical Lafarge Fresco systems:Timber stud partitions

31 3.0 107 30 38

30


FTC 01 Flooring: minimum 18mm timber or T&G chipboard


Facings: one layer Lafarge Fresco Ceiling Panel on timber battens at 400mm centres

Table 6.3 Typical Lafarge Fresco systems: Ceiling to timber floor

37 30 38 78

30

Table 6.4 Typical Lafarge Fresco systems: Cormet Metal Furring Ceilings

FCE 01 Ceiling: one layer Lafarge Fresco Ceiling Panel onCormet Ceiling Channel at 400mm centres

15 30


Lafarge Fresco allows theappearance of traditional timberpanelling to be re-created withease, using modern drywallmaterials.

Available for walls, stairwells andceilings, Lafarge Fresco can beinstalled as quickly and efficientlyas other drywall boards, allowingstunning effects to be achieved atrealistic cost.

The boards can be decorated tomimic timber, or painted and canalso accept a range of specialdecorative effects.


C R E A T I V E S O L U T I O N SFRESCO

251

6

252



Introduction

Lafarge FrescoLafarge Fresco raised panelwallboards allow the traditionalappearance of panelled walls andceilings to be achieved economicallywith normal drylining techniques.

They can be used for both housingand commercial buildings in newand refurbishment work, as a walland ceiling lining or as a partitionfacing (on one or both sides).

Lafarge Fresco panels can beinstalled on timber or Cormet MetalFraming in a similar way to standardplasterboard. They can also be directbonded to sound, dry backgrounds.

Composition

Lafarge Fresco is produced using aunique plasterboard manufacturingprocess. The plaster core containsglass fibres and fillers.

Authority

Lafarge Fresco plasterboardcomplies with BS 1230: Part 1: 1985for Type 5 gypsum wallboard.

Appearance

The sculptured face of LafargeFresco panels has a pink liner papersuitable for direct decoration.Lafarge Fresco can be used withLafarge Drywall jointing systems toprovide a continuous panelled effectwith a smooth seamless finish thatwill accept a range of paint finishes.

Performance

Lafarge Fresco has fire resistant andsound insulation propertiesequivalent to 12.5mm LafargeFirecheck wallboard and can besubstituted directly for it in LafargeDrywall systems.

Thermal insulation

Thermal conductivity (λ) is 0.25 W/mK.Thermal resistance (R) value is 0.050 m2K/W.

Range

There are four Lafarge Fresco panelsavailable in two panel designs, asshown in Table 6.5.

Standard Fresco boards are designedfor use in housing and small roomareas in retail and commercialbuildings.

Fresco Grand boards have a biggerpanel imprint for lining larger wallsurfaces, such as hotel corridors andreception areas.

Table 6.5 Fresco rangeStandard Fresco Fresco Grand

Wainscot Panel ✓ ✓

Mainwall Panel ✓ ✓

Ceiling Panel ✓ ✓

Stairwall Panel ✓

Fresco Standard Panel

Fresco Grand Ceiling Panel



253

6

Components

Fresco Wainscot Panel

Wainscot Panels are designed foruse along the lower part of a wallbetween the floor and a chair rail ordado rail. They can also be used oneabove the other to cover the wholewall height.

Wainscot Panels are available inFresco Standard and Fresco Granddesign patterns.

Fresco Mainwall Panel

Mainwall Panels are designed foruse above Wainscot. Boards can alsobe used one above the other tocover the whole wall where ceilingheights permit.

Mainwall Panels are available inFresco Standard and Fresco Granddesign patterns.

Fresco Ceiling Panel

Ceiling Panel boards can be buttjointed to form a continuouspanelled ceiling.

Ceiling Panels are available in FrescoStandard and Fresco Grand designpatterns.

Fresco Stairwall Panel

Fresco Stairwall Panel enablesFresco panelling to continue up thestairs. The panel is ideal for bothnew build and refurbishmentapplications.

Fresco Stairwall Panel is 400mm x1300mm and easily adjusts to anystair angle up to 42º. The panelshave a recess on both long edges toallow for easy jointing.

Stairwall Panels are not available inFresco Grand pattern.

Table 6.6 Board sizesPattern Length (mm) Width (mm) Thickness (mm)

Wainscot Panel 800 1200 15

Mainwall Panel 1600 1200 15

Ceiling Panel 1200 1200 15

Stairwall Panel 1300 400 15

50 300

30

100 300 100 300 50

30

30

30 90

560

15030

800

1200

100

300

1200

1600

50 300

30

100 300 100 300 50

30

1200

1200

400

370

1300560

370

300

30 3020 20

50 50

StandardMainwall Panel

Standard Wainscot Panel

Standard Ceiling PanelStairwall Panel

Lafarge Standard Fresco Panel range

All dimensions in mmScale 1: 20

254



Components

1200

110050 50

1600 1400

100

100

90

560

150

800

1200

1200

1200

50050 500 50100

Grand Mainwall Panel

Grand Wainscot Panel

Grand Ceiling Panel

Lafarge Fresco Grand Panel range

All dimensions in mmScale 1: 20



255

6

Setting out and planning

Careful planning at setting outstage can result in savings in bothtime and materials duringinstallation.

Except where the panelling is to beinstalled in simple rectangular areaswith no interruptions, it isrecommended that a detaileddimensioned layout is prepared foreach installation.

Wall layouts

Wherever possible, the location offeatures such as doors, windows,radiators etc. should be planned tosuit the setting out of the LafargeFresco panels. Fixtures, and itemssuch as electrical socket outlets,switches, television and telephoneoutlets should be positioned to fallwithin the flat surfaces of thepanels.

Where openings cannot be plannedto suit the module of the LafargeFresco panels, spacer pieces will berequired at ends of runs. Therecessed edge of Lafarge Frescopanels allows them to be jointedwith tapered edge 15mm LafargeFirecheck wallboard.

Set out framing at 400mm centres,or where direct bonded apply dabsof Lafarge Bonding Compound invertical rows at 400mm centres.

Additional framing is required tosupport horizontal joints.

Standard MainwallPanel above StandardWainscot Panel,height 2400mm

Three StandardWainscot Panels,height 2400mm

Plain wallboardabove StandardWainscot Panel,height as required

Wall layouts

Grand Mainwall Panelabove Grand WainscotPanel,height 2400mm

Three Grand WainscotPanels,height 2400mm

Standard MainwallPanel above GrandWainscot Panel,height 2400mm

Application details

256



Application details

Table 6.7 Recommended screw lengthsConstruction Plasterboard Screw length Type

thickness (mm) (mm) Lafarge

Timber framing Single layer 15.0 41 High Thread

Double layer 15.0 + 9.5 51 High Thread




Steel framing Single layer 15.0 25 Self Tapping Drywall

Double layer 15.0 + 9.5 38 Self Tapping Drywall




NB: Actual configurations of framing andin-fill board will vary with setting out

Cutting

Always support the boards toprevent flexing. Lafarge Frescoshould be cut with a fine-toothedsaw, alternatively use a sharp knifeto deeply score the face, gentlybreak the board from the back andcut the other liner. Do not cut acrossthe sculptured panels. Keep cuts atleast 25mm from the sculpturedpanel edges.

Fixings to timber/Cormet MetalFraming

Use appropriate Lafarge Screws forfixing.

Screw lengths are given in table 6.7.

Screw position

• at least 10mm in from paperbound edges of the boards

• within the flat surfaces of thesculptured panels, at least 25mmin from the pattern edges

• at least 13mm in from any cutedges of the boards

Screw spacing

• 230mm centres on ceilings and150mm centres around ceilingperimeters and cut ends of board

• 300mm centres on walls andpartitions

Spot screw heads with jointingcompounds to provide a flushsurface.

Alternatively Lafarge Fresco panelsmay be installed by direct bondingwith Lafarge Bonding Compound.

Refer to page 30 for recommendations and limitations.

Jointing

The unique recessed edge of LafargeFresco enables the panels to bejointed using similar techniques totapered edge plasterboards.

Finishing

Finish the installed panels withLafarge Universal Sealer or LafargeDrywall Sealer and as normal withemulsion paint. Spray paintingproduces the best appearance. Paintmay also be applied to the flat areasof the boards with a very finetextured roller, and to thesculptured areas with a brush.

Repairs

If localised damage to thesculptured panels should occur,repair using ornamental plastertechniques. Flat areas may berepaired in the normal way.

Typical joint

Joint tape Recessed edges finish flushwith jointing compound

External corner

Internal corner

Jointing compound

50mm

In-fill with 12.5mmLafarge Firecheckwallboard

Lafarge Tape-On Bead



257

6

Application details

Stairwall Layouts

Planning

As for regular Lafarge Frescopanels, planning prior to installationis critical. For best results, includethe landing and hall in the stairlayout diagram.

• Measure the horizontal length ofthe staircase (A).

• Divide this length by 400mm togive the number of panelsrequired.

• For example A = 2500mm ÷ 400 =6 with 100mm left over. Panellingwill therefore start 50mm frombottom edge.

• Position panels as on the drawing.

• Plan hall and landing as forregular Fresco.

Panels should be cut to the stairangle (maximum 42º) passing nocloser than 40mm to the mouldedpattern, at top and bottom.

For lower angle stairs this distancemay be increased as taste dictates.

It may be preferable to place alarger filler piece at the end of thehall and landing to ensure smoothflow of panelling up the stairs.

Installation

Install panels as for regular Fresco,butting to the string of the stairs.

Alternatively Lafarge Fresco panelsmay be direct bonded to theexisting wall using Lafarge DrywallAdhesive. Secure with 60mmLafarge Nailable Plugs into masonrybackgrounds.

40mmminimum

42º maximum

Critical dimensions

1250 2500 1250

A

1250 2400 125050 50

1200 2400 120050 50

Setting out Stairwall Panels

Note, skirtingand dado railby others

258



Application details

Ceiling layouts

Where the ceiling includes recessedor surface mounted lighting fittingsthey should be positioned in thecentres of raised panels, borders orspacer pieces.

In planning ceiling layouts use amodule of 400mm for FrescoStandard and 600mm for FrescoGrand.

Rectangular Rooms: If the overallceiling dimensions are multiples of1200mm, the entire ceiling may becovered with uncut butt-jointedboards.

If the overall ceiling dimensions aremultiples of 400mm (600mm), theceiling should be made up of fullboards plus a perimeter surround ofuniform width, made up from 15mmtaper edge Lafarge Firecheckwallboard.

Rectangular Rooms, non-modular:Prepare a dimensioned layout. Makeup perimeter areas as necessary withfiller pieces of 15mm taper edgeLafarge Firecheck wallboard makingthe border widths as uniform aspossible.

Set out framing at 400mm (300 for600mm module) centres. Provideadditional framing as required.

Handling and storage

These products require more care inhandling than Standard wallboard.Packs as delivered should be storedflat and not opened until thedetailed instruction sheet providedwith each pack has been readcarefully. To install, tilt each boardupright onto one cut edge and carryin the vertical position to theframing, taking care not to flex theboard whilst screwing into position.

Ceiling layouts

Rectangular room, 1200mm module

Rectangular room, 400mm module

400mm module

Rectangular room, non modular

15mm Lafarge Firecheck wallboard perimeter surround



259

6


Lafarge Fresco

Scope

Alternative clauses for specifyingLafarge Fresco to linings, partitions,timber framed or suspendedceilings.

Additional clauses





NBS clauses




Location ........................Client reference ........................Adhesive applicationApply Lafarge Bonding Compound or Lafarge Multi Purpose Adhesive in250mm dabs at 300mm centres in vertical rows, ……… /No. rows per board. (3 No. rows for Fresco Grand, 4 No. rows for Standard Fresco.)

Finished thickness to be 10-25mm.

Cormet Metal Framing componentsFraming components to be hot dipped galvanised steel to BS EN 10143: 1993and BS EN 10142: 1990 and Approved Document A1: 1995 designated DX51Dand Z275 NAO. Sections rolled to BS 2994: 1987.

FramingProvide extra framing to support fixing of Fresco at ……… mm centres.(400mm centres for Standard Fresco and 300mm centres for Fresco GrandCeiling Panels.)

BoardingLafarge Fresco ……………………………panels.

Size ……… mm x ……… mm Thickness 15mm.

(Panel types and sizes are given on pages 261 and 262)

InstallationAll materials unless otherwise indicated shall be supplied by LafargePlasterboard Ltd, and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Notes:



260



Case study

Lafarge Cove products makeadding a quality finish, with style,both simple and affordable.Readily fixed with Lafarge CoveAdhesive.

Use of Lafarge Cove inconjunction with strips ofplasterboard allows still moreintricate designs to be created.

Once reserved for prestige homes and the principal rooms of properties, these products now allow cove to be addedthroughout a development atminimal cost.


C R E A T I V E S O L U T I O N SCOVE

261

6

262



Introduction

Lafarge CoveLafarge Cove is a simple and costeffective way of adding attractiveand distinctive features to the walland ceiling junction. Designed forinternal use Lafarge Cove cancomplement many room styles.

Composition

Lafarge Cove is made from plasterencased in a strong paper liner. Thesquare back profile and puregypsum core provide high strengthand rigidity giving easy fixing andgood workability.

Sizes

See table 6.8.

Lafarge Cove Adhesive

Lafarge Cove Adhesive is a gypsumbased compound with a 40 minutesetting time. It has exceptionalsmoothness for ease of applicationand dries white for ease ofdecoration. Lafarge Cove Adhesiveis also ideal for filling and patchingLafarge Cove.

Table 6.8 SizesGirths Lengths Weights(mm) (mm) (kg/m)

90 3000, 3600 0.9

120 3000, 3600, 4200 1.4

Cove 120

Cove 90

Cove 120

Cove 90

84

64



263

6

Application details

Fixing Cove

• Sit the lengths of cove on the nailsand press into position betweenthe guidelines, carefully lining upjoints and intersections.

• Clean off surplus adhesive withfilling knife and smooth using asponge.

• Using Lafarge Cove Adhesive fillany gaps between the cove andthe wall or ceiling. Make good allinternal and external junctions.

• Remove all temporary nails oncethe cove adhesive has set and fillnail holes.

• Using a damp sponge, clean offany adhesive residue from thewalls, ceiling and cove surface.

With uneven ceilings it may benecessary to permanently nail thecove about 25mm from one edgeusing Lafarge Drywall Nails. Nailheads should be countersunk andcovered with Lafarge Cove Adhesive.

Where surfaces have been previouslypainted, they must be abradedvigorously with sandpaper or a wirebrush and coated with a 50:50mixture of a PVAC bonding agentand water. For further detailscontact the Lafarge TechnicalEnquiryline (01275 377789).

System assembly

The following instructions describethe correct method of installationfor Lafarge Cove. Any variations ofthese methods may produceunsatisfactory results.

Preparation of background

Make sure the background is dryand rigid. Any wallpaper,whitewash, distemper or loosedecorations should be removed.Brush over the surface to removeany remaining loose particles anddust.

Measuring and cutting

• Using a chalk line strike guidelineson ceiling and wall to the correctprojection and depth:64mm for 90mm Lafarge Cove84mm for 120mm Lafarge Cove

• Using the guidelines on the walldrive in nails at 1500mm centres toact as a temporary support whilethe cove adhesive sets.

• Using a fine-toothed saw cut allthe pieces of cove to length andmitre to fit the corners of theroom.The mitres can be cut using amitre block or template. Templatesare available from LafargePlasterboard Literatureline orwww.lafargeplasterboard.co.ukNote: It is best practice to fit thelongest lengths first and work inone direction around the room. If the room has a chimney breaststart on the face of the chimneyand work in one direction aroundthe room.

Mixing and applying LafargeCove Adhesive

• Ensure the site temperature neverfalls below 5ºC.

• Always use clean tools and water.

• Pour clean, drinkable water into acontainer.

• Gradually add the amount ofLafarge Cove Adhesive that can beused within 30-40 minutes, stirringcontinuously.

• Mix to a smooth, thick, lump freeconsistency.

• Stir mixture immediately before use.

• Apply the adhesive in beadsapproximately 3mm thick and10mm wide along the full lengthon each back edge of the cove.

• Apply to one cove section at a time.

Decorating

Lafarge Cove is suitable for mosttypes of decoration including:

Painting

Apply one coat of Lafarge UniversalSealer, or if a vapour control layer isrequired use two coats of LafargeDrywall Sealer, and decorate asrequired.

Paper borders

Paper borders may be applied to thepainted surface to providedistinctive appearance.

Texturing

Apply Lafarge Universal Texture orsimilar according to manufacturer’sinstructions and recommendations.

Plasterboard strips

The addition of plasterboard stripsbetween the coving and thewall/ceiling can greatly enhance thecoving feature. See details on nextpage.

Ensure that the visible edges of theplasterboard strips are bound edgesto facilitate decoration.

Lafarge Cove bonded with LafargeCove Adhesive at wall and ceiling

264



Application details

Examples of coving details using LafargeCove and Lafarge Standard wallboard

Lafarge Cove bonded with LafargeCove Adhesive at ceiling toLafarge Standard wallboard strip100mm wide securely fastened toceiling*

Lafarge Cove bonded with LafargeCove Adhesive at ceiling to twostrips of Lafarge Standardwallboard 100mm wide securelyfastened to ceiling*

Lafarge Cove bondedwith Lafarge CoveAdhesive at wall andceiling to LafargeStandard wallboard strip100mm wide securelyfastened to wall andceiling*

Lafarge Cove bonded withLafarge Cove Adhesive atwall and ceiling to twoLafarge Standard wallboardstrips 100mm wide securelyfastened to wall and ceiling**Use square edge wallboard,

bound edges outward.



265

6

Lafarge Cove

Scope

The application of Lafarge Cove atthe wall/ceiling junction.

Additional clauses





NBS clauses



Location……………………………………Client reference ........................BackgroundThe background shall be undecorated new plasterboard, or

The painted surface to be abraded to make a new key and treated with PVACbonding agent to BS 5270, or

The textured coating to be removed taking care not to damage the surface ofthe plasterboard beneath. Once texture is removed, treat surface with PVACbonding agent to BS 5270.

Plasterboard stripsInstall strips of ……mm thick Lafarge Standard wallboard in accordance withdetail reference ……… using Lafarge Cove Adhesive. (Insert information onplasterboard thickness and detailed drawing reference)

CovingLafarge Cove, width 120mm or 90mm to be fixed using Lafarge Cove Adhesivefully in accordance with Lafarge Plasterboard’s instructions, including fillinggaps with adhesive.

Drywall SealerOnce dry, the surface of the Cove shall be sealed with one coat of LafargeDrywall Sealer or Lafarge Universal Sealer.

DecorationThe Cove shall be decorated with the adjacent plasterboard (or other)surfaces.

InstallationAll materials unless otherwise indicated shall be supplied by LafargePlasterboard Ltd, and shall be installed in accordance with their currentliterature and in accordance with BS 8212: 1995.

Notes:




266



Case study


C R E A T I V E S O L U T I O N SPROFILES

267

6

The Lafarge Profiles rangecomprises metal sections designedto complement the Lafarge boardrange and allow the creation ofintricate details, reveals,shadowlines, and uplighters.

These products offer the architectthe opportunity to expandcreative horizons and achieveapparently complex design effectswith remarkable ease.

268



Introduction

Lafarge ProfilesThe Lafarge Profile range ofarchitectural design products allowsfeatures once only possible with wet plaster and costly one-offcomponents to be achieved quicklyand economically.

The Lafarge Profile range enablesthe designer to use plasterboard innew and more imaginative ways,and to create interesting andpleasant living and workingenvironments whilst meetingmodern requirements for use ofspace and performance.

Lafarge Profiles offer two powerfuldesign solutions:

Shadowline and Softform

Lafarge Shadowline Profiles providemany opportunities for theintroduction of relief andarticulation to wall and ceilingsurfaces: expressed joints, reveals,accented junctions, recessedpanelling and stepped cornices,architraves and mouldings.

A softer approach is possible withLafarge Shadowline Profile to createsmooth curves at intersecting planes,corners, door surrounds, partitionjunctions and bullnose ends.

The Lafarge Profiles Uplighter rangeof fittings incorporate the steppedand rounded corner details of theShadowline and Softform profilesrespectively

Performance

Fire protection

Where fire resistance is required, anadditional layer of Lafarge wallboardmust be added to the basic fire-resisting partition to accommodatethe Lafarge Profile. Installations usingLafarge Profiles will maintain theClass 0 flame spread rating ofLafarge plasterboard.

Sound insulation

The acoustic performance of apartition may be compromised byusing Lafarge Profiles. To maintainacoustic performance an additionallayer of Lafarge wallboard must beadded to the basic sound resistingpartition to accommodate theLafarge Profiles.

Composition

All Lafarge Profiles are producedfrom high-strength dimensionallyprecise aluminium alloy extrusions.They are finished with a corrosion-resistant high-porosity primer whichis compatible with most materialscommonly in use in commercial anddomestic interiors, such as vinylemulsion paints and wallcoveringadhesives etc.

Shapes, sizes

All Profiles are supplied in lengths of3000mm. The full range of sectionsis shown on the following pages.

Profile features

Pre-drilled fixing slots/holes

Ribs form a key for jointingcompound

Treated with corrosion-resistant high-porosity primer

High strength aluminiumresists impact

Dimensionally preciseextrusions ensures crisp edgesand allows minimaltolerances to be achieved



269

6

Components

Table 6.9 Lafarge Softform componentsComponent Lafarge Description/use

code

Softform Uplighter SUS52 Curved casing to incorporate linear

lighting

Uplighter Support USB1 Provides a mounting for linear lighting

Bracket

Softform Bullnose SB75 Creates a smooth round finish to a

SB95 partition end and projecting bulkhead

Softform Outside SO64 Allows partitions and wall linings to be

Corner SO76 constructed with 90° corners. No

additional impact protection is required

Softform Inside SI64 Allows partitions and wall linings to be

Corner SI76 constructed with 90° corners. No

additional impact protection is required

Trim Head Screw 41THST25 A self tapping screw for flush finish

57THST25 with Lafarge Profiles

52

120

128

120

100

76 114 64 98

76105 64

86

7698

Softform UplighterSUS52

Uplighter SupportBracket USB1

Softform Bullnose

SB95 SB75

Softform 90º Inside Corner

SI76 SI64

Softform 90º Outside Corner

SO76 SO64

Dimensions of Softform profiles

270



Components

Table 6.10 Lafarge Shadowline componentsComponent Lafarge Description/use

code

Shadowline Uplighter SUS4 Crisp stepped extrusion to incorporate

linear lighting

Uplighter Support USB1 Provides a mounting for linear lighting

Bracket

Shadowline Reveal SWR12.5 Provides a means of relieving runs of

SWR25 drywall with recessed accent lines

Shadowline Hanging SHR12.5 Incorporates a concealed track for

Reveal picture and other lightweight hangings

Shadowline Picture SPH1 For use with Shadowline Hanging

Hanger Reveal

Shadowline Corner SCS2 Allows complex corner details to be

Step SCS4 incorporated into wall angles, ceilings,

soffits and columns

Shadowline Trim Reveal STR12.5 Enables neat architrave details to be

STR25 created around door frames, skirtings

and at partition junctions

Shadowline Z Step SWZ12.5 Allows the drywall linings to be easily

SWZ25 raised or recessed

Shadowline Edge Trim ST12.5 Sharp 90° aluminium extrusion installed

ST25 against cut edges of plasterboard

Shadowline Flex Trim STF12.5 Allows raised or recessed panels or

STF25 opening in walls to be constructed with

curved edges

Shadowline Skirting SWB105 The Shadowline Skirting provides a

recessed finish to the wall at floor level.

The bottom edge of the skirting is

thinner to allow scribing to an irregular

floor surface

Trim Head Screw 41THST25 A self tapping screw for flush finish

57THST25 with Lafarge Profiles

Shadowline UplighterSUS4

Uplighter Support BracketUSB1

128

120

100

120

Dimensions of Shadowline profiles



271

6

Components

22

25

22

11 11

22

12.5

22

22

12.5

32

11

Shadowline Reveal

ShadowlineHanging RevealSHR12.5 andPicture HangerSPH1

SWR25 SWR12.5

STR25

11

25

22

11

12.5

22

STR12.5

Shadowline Trim Reveal

24

22

24

22

25 12.5

SWZ25 SWZ12.5

Shadowline Z Step

22

25

22

12.5 25 12.5

22 22

ST25 ST12.5

Shadowline Trim

STF25 STF12.5

Shadowline Flex Trim

22

22 8

SCS4 SCS2

Shadowline Corner Step

88

12.5

12.5

12.5

22

12.5

22 12.5

22

11

104

Shadowline SkirtingSWB105

1.8mm diameterhole in PictureHanger to receivewire hanger byothers

Dimensions of Shadowline profiles

272



Application details

Shadowline UplighterLafarge Profile Uplighter is a non-structural feature designed to incorporate linear fluorescentlighting up to 100mm in width. Theassembly uses Lafarge UplighterSupport Brackets (USB1) to providea mounting for linear lighting.

System Assembly

Lafarge Profile Uplighter can befixed to drylined masonry walls andpartitions. Lafarge Profile Uplighterrequires no special installationtechniques, however considerationof its location during setting out willreduce time and wastage andenable the position of anyadditional framing required tosupport the assembly to bedetermined.

Fixing Brackets

After boarding, screw fix LafargeUplighter Support Brackets throughthe plasterboard and into thesupporting framing, as required,centres not to exceed 1200mm.

For masonry walls, drill and plug toa minimum 25mm into masonry.

When fixing to an existing partition,first locate the existing studwork.Screw fix at least one side of theLafarge Uplighter Support Bracketto the framing and secure the otherside to the plasterboard withLafarge Laminating Screws.

Fixing Uplighters

Cut Lafarge Profile Uplighter tolength using a mitre box and largehack saw. Accuracy with cuts andmitres will ensure crisp jointing.Offer the Lafarge Profile Uplighterto the Lafarge Uplighter SupportBrackets and fit. Screw fix throughthe fixing fin and plasterboard intothe framing at 150mm centres.

For masonry walls, drill and plug toa minimum 25mm into masonry.

For existing partitions, screw fix atexisting framing centres, run acontinuous bead of Lafarge DrywallAdhesive along the fixing fins andsecure fix between the framingcentres with Lafarge LaminatingScrews at 150mm centres. Allow tocure for 24 hours.

Lengths of uplighters may be buttjointed and cut ends supported by aLafarge Uplighter Support Bracket.Flush joints may be created by filingbevels on the cut ends to form ashallow v-joint, then filling withglass fibre/resin metal body puttyand sanding smooth.

Shadowline Uplighter

Lafarge Profile ShadowlineUplighter SUS4

Lafarge Profile UplighterSupport Bracket USB1

Lafarge Profile SoftformUplighter SUS52

Lafarge Profile UplighterSupport Bracket USB1

Softform Uplighter



273

6

Application details

Shadowline Profiles

Shadowline Reveal

Lafarge Profile Shadowline Revealscan be used to provide horizontal orvertical recessed bands with crisp,well-defined edges in wall linings,ceilings and partitions.

Shadowline Hanging Reveal

The Lafarge Profile ShadowlineHanging Reveal offers a simple andeffective solution to the problem ofproviding unobtrusive picture rails,for the home, office or gallery.

It is suitable for hangings with apoint load of up to 50kg and amaximum loading not exceeding100kg/m UDL without additionalframing supports. Contact ourTechnical Enquiryline for furtherdetails.

Using a file or drill, form a 25mmcut-out in at least one end of eachrun of Reveal before fixing, to allowfor insertion of hangers.

12.5mm Shadowline RevealSWR12.5 screw-fixed throughplasterboard to CormetMetal Stud

ShadowlineHanging RevealSHR12.5 securedthroughplasterboard toCormet MetalStud

Form cutout toaccept picturehanger at buttjoints or ends ofruns beforeinstallation

Wire hanger frompicture hanger byothers

1.8mmdiameter hole

File back topparts of grooveto form 25mmcutout forinsertion ofpicture hanger

274



Application details

30mm diameter dabLafarge DrywallAdhesive at 300mmhorizontal centres

Joint taped and filled

Cormet U Track

1.5mmgap

Shadowline Skirtingscrew fixed throughplasterboards toCormet Metal Studs

Shadowline Skirting

The Lafarge Shadowline Skirtingprovides a recessed finish to the wallat floor level. The bottom edge ofthe skirting is thinner to allowscribing to an irregular floor surface.

Apply a 6mm bead of LafargeDrywall Adhesive along the centreof the skirting panel. Fasten skirtingby fixing fins, then countersink twoscrews through to the framing ateach end of the skirting panel.

Shadowline Z Step

Shadowline Z Steps provide a quickmethod of forming recessed panels.They ensure that sharp, even cornerscan be achieved swiftly. The fins ofthe Z step are tapered to allowsmooth jointing to plasterboard atboth edges.

Joint taped andfilled

12.5mm Shadowline ZStep SWZ12.5 securedthrough plasterboard totimber studs with LafargeTrim Head Screws

Shadowline Trim Reveal

Lafarge Profile Shadowline TrimReveals have one tapered fin forsmooth jointing to the plasterboardface; the other fin is square forbutting against a return face ortimber framing.

12.5mm ShadowlineTrim Reveal STR12.5secured throughplasterboard toCormet Metal Studswith Lafarge TrimHead Screws



275

6

Application details

Shadowline Corner Steps

Lafarge Profile Shadowline CornerSteps extend the range and allowmore intricate edge details to beincorporated into walls, columnsand around ceiling recesses. Theyare available in double and quadstep configurations.

Shadowline QuadCorner Step SCS4secured throughplasterboard tometal supports

Cormet CeilingChannel

Cormet PrimaryChannel

Shadowline Trims

Lafarge Profile Shadowline EdgeTrim provides a neat edge to cutboard ends. Lafarge ProfileShadowline Flex Trim pre-cut edgetrim allows the creation of sharpcurved edges to a minimum radiusof 75mm.

Shadowline Double Corner Step SCS2forming an interesting partition end orsurround to an opening

25mm Shadowline FlexTrim STF25

25mm Shadowline EdgeTrim ST25

276



Application details

Softform ProfilesWithin the Lafarge range aresmoothly flowing profiles forcorners and bullnoses. They are aneconomical design solution forinherently safer and stronger cornertreatments.

Lafarge Softform Profiles are astylish solution to corner protectionin high traffic areas. The aluminiumalloy extrusion resists impacts betterthan conventional cornertreatments, and allows cornerprotection to be built-in to the wall,so removing the need for unsightlyexternally-applied protection.

Softform Corners

Lafarge Profile Softform Cornersallow partitions and wall linings tobe constructed with smooth curvedcorners. Both internal and external90º corners can be formed, and therobust Profile sections do notrequire any additional impactprotection.

In a 30 minute fire resistingpartition, the fire resistance can bemaintained at the curved corners bythe method shown.

Similarly, 60 minute fire resistancecan be maintained using anadditional layer of plasterboard, asshown.

Lafarge Profile Softform Corners canalso be used in many other wayswhere such smooth curved shapesare preferred, for example to createa recessed frame.

Additional Cormet MetalStuds to provide fixingpoints for SoftformInside Corner Profile

76mm radius SoftformOutside Corner securedthrough plasterboard tometal studs with LafargeTrim Head Screws

76mm radius SoftformOutside Corner SO76

76mm radius SoftformInside Corner SI76

Softform Corners: 30 minutes fire resistance

Softform Corners: 60 minutes fire resistance

Cormet U Tracksecured to bothend studs

Additional CormetMetal Stud secured toboth end studs toprovide support tocorner

76mm radiusSoftform OutsideCorner SO76

Cut strips of 12.5mmwallboard screwfixed to studwork tomaintain 30 minutesfire resistance

Cormet U Tracksecured to bothend studs

Cut strips of 12.5mmwallboard screwfixed to studwork tomaintain 60 minutesfire resistance

76mm radiusSoftform OutsideCorner SO76

Softform Outside Corner formingcurved corner to partition

Additional CormetMetal Stud secured toboth end studs toprovide support tocorner



277

6

Application details

Softform Bullnose

The Lafarge Profile SoftformBullnose creates a smooth roundfinish to a partition end, and can beused for other features such as aprojecting bulkhead, shown here.

This detail also shows the use ofLafarge Profile Shadowline TrimReveals to form recessed joints atpartition junctions.

Softform Outside Cornersused to great effect tocreate a recessed frame

76mm radius Softform OutsideCorner SO76 screw-fixedthrough plasterboard to CormetMetal Studs

41mm radius SoftformBullnose SB75 screwfixed throughplasterboard toCormet Metal Studs

12.5mm ShadowlineTrim Reveal STR12.5fixed throughplasterboard toCormet Metal Studs

Softform Bullnose projectionon Cormet Metal Stud

Joints tapedand filled

278



Installation

Storage

Keep materials secure, covered andaway from sources of potentialdamage, such as high traffic areas.Store on a flat surface. Verticalstorage can cause end damage andwarping.

Installation

Lafarge Profiles can be used in walls,partitions and ceilings. They aredesigned for use with single ordouble layers of plasterboard ontimber, Cormet steel studwork, orwith Cormet metal furring channels.

Lafarge Profiles require no specialtechniques, however, considerationof their location during setting outwill reduce wastage, minimise thecutting, and enable the position ofany additional framing required tosupport the Profiles to bedetermined.

Framing centres must not exceed600mm. Additional support fromextra studs or fixing channel shouldbe provided at profile joint. Alwaysfully support cut edges ofplasterboards. A double layer ofdrylining will give greater rigidity.

Fixing

Install framing etc as required, andapply plasterboards. Referenceshould be made to BS 8212: 1995Code of practice for drylining andpartitioning using gypsumplasterboard.

For the Softform Bullnose, finish theplasterboard flush with the line ofthe stud.

For other Lafarge Profiles ensurethat the Cormet metal framesupports the profile fixing fins.

Always use a drop saw (fixed powersaw) or fine toothed hand saw withmetal cutting blade to cut LafargeProfiles. Lengths of profiles areusually butt jointed. Accuracy withcuts and mitres will ensure crispjointing. Alternatively, a smoothjoint can be achieved with SoftformProfiles by filing bevels on the cutends to form a shallow v-joint; fillwith fibreglass body putty and sandsmooth.

Test fit Lafarge Profiles, and screw-fix into the framing at all profilejoints and along their entire lengthwhere they cross studs or wherethey lie along the line of theframing, at 150mm centres.

Table 6.11 Softform Profiles selectorProfile number of 12.5mm Stud Stud position Profile

plasterboard size from apex radiuslayers (mm) (mm) (mm)

Softform Outside Corner 1 50 at apex 64

1 70 at apex 76

2 50 at apex 76

Softform Inside Corner 1 50 or 70 75 64

1 50 or 70 90 76

2 50 or 70 90 64

2 50 or 70 115 76

Softform Bullnose 1 50 – 41

1 70 – 52

Table 6.12 Profile fixings selectorPlasterboard layers Lafarge Trim Head Screw length (mm)and thickness (mm) Cormet Metal framing Timber framing

12.5 41 41

12.5 +12.5 41 57

15.0 41 41

15.0 + 15.0 41 57

Mitreing guide for Shadowline Reveals

T junction X junction

Corner T junction of Reveal with Trim Reveals



279

6

Installation

Finishing

Once all Lafarge Profiles have beenfixed, bed jointing tape withLafarge Fast Set jointing compoundalong the fixing fins, taking care toensure that the jointing tape doesnot overlap the shoulder of theprofile. Apply a finishing coat ofcompound 200mm (8in) wide usinga trowel. Run the trowel down thejoint, keeping its edge in contactwith the shoulder of the profile andwith the surface of the plasterboardto ensure a flush finish.

Clean off all jointing compoundsfrom the surface of the profiles. Donot allow the Shadowline HangingReveal (SHR12.5) to become blockedand ensure that the picture hangerswill be able to move freely inside it.

Sand smooth with 120 grit sandingpaper. Seal with Lafarge DrywallSealer or Lafarge Universal Sealerbefore decoration.

Decoration

Lafarge Profiles accept most types ofdecoration:

• emulsion or oil-based paints

• Stipples, enamels, texturedcoatings

• wallpapers

Matt finishes give the bestappearance.

Decoration should be carried out assoon as possible after the jointingcompound is thoroughly dry. Beforepainting it is important to equalisethe difference in absorptionbetween the plasterboard surface,the joint and the Lafarge Profile.Use one coat of Lafarge DrywallSealer to ensure uniformity ofcolour and texture over the entiresurface. A sealer coat is alsoessential before applying wallpaperor other wallcoverings so that thecovering can be removed forredecoration without damaging thewallboard surface.

When wall papering apply adhesiveright to the edge of the LafargeProfile, to avoid the possibility ofthe wallpaper peeling back.

Jointing method

Coat of jointcementfinished flush

Lafarge Jointing Tapebedded with LafargeFast Set jointingcompound along thefixing fin. Ensure thatLafarge Jointing Tapedoes not overlap theexposed Profile edge.

Table 6.13 Jointing compound selectorProduct Pack size Bedding Finishing

tapes joints

Fast Set 12.5 kg bag ✔ –

Deco Joint Filler 12.5 kg bag ✔ –

Rapid Sand 22.5 kg bag – ✔

Easy Finish 10 kg bag ✔ ✔

New Pure Velvet 25 kg bag – ✔

FineForm Mid-Weight 20 kg bucket – ✔

Readymix Lite 20 kg bucket – ✔

Deco Joint Cement 20 kg bucket – ✔

280




Lafarge Profiles

Scope

Extra alternatives clauses requiredfor specifying Lafarge Profiles.partitions/linings to be fullyspecified as required.

Additional clauses





NBS clauses




Location…………………………………………Metal framing componentsFraming components to be hot dipped galvanised steel to BS EN 10143: 1993and BS EN 10142: 1990 and Approved Document A1: 1995 designated DX51Dand Z275 NAO. Sections rolled to BS 2994: 1987.

FramingProvide extra framing along lines of Profiles to support cut edges ofplasterboard and provide screw fixings of Profiles, all in accordance withLafarge Plasterboard’s instructions.

BoardingProvide extra layer of 12.5mm plasterboard to surfaces which are to receiveLafarge Profiles with boards cut away to suit, in accordance with LafargePlasterboard’s instructions. (This is required to maintain the performance ofthe system.)

Profiles (repeat as required)Lafarge Shadowline Profile ……… Type ……… Reference ………

Lafarge Softform Profile ……… Type ……… Reference ………

Mitreing/JointingMitre and cut Profiles with a bench fixed drop saw, or

Cut Profiles with a hacksaw.

FixingsLafarge Grabber Trim Head Screws

Length ……… mm at maximum 600mm centres fixed through taping fins ofProfiles and plasterboards into framing. (See Fixings in Section 8)

Taping and JointingBed joint tapes in Lafarge Joint Compound over Profiles taping fins. (Do nouse air drying compound for bedding tapes on Profiles.)

Bevel cut edges of Profiles at joins and mitres and fill with proprietary glassfibre/resin metal body putty. Sand smooth.

Cut Profiles accurately, neatly and butt joint.

Materials and InstallationAll materials unless otherwise indicated shall be supplied by Lafarge Plasterboard Ltd, and shall be installed in accordance with theircurrent literature and in accordance with BS 8212: 1995.

Finish joints with .......... (See Section 7 Finishing)

Notes:




C R E A T I V E S O L U T I O N SCONTOUR WALLS

281

6

Curved wall surfaces, which oncerequired time-consuming wetplaster technology or expensivefibrous plaster mouldings, cannow be formed with quick andinexpensive Lafarge drywallsystems.

Utilising the drywall advantage itis now possible to create highquality curved plaster forms withLafarge standard wallboards andat the same time meet tight timeand cost restraints. Becausedrywall systems need no time todry out, following trades canproceed immediately, minimisingconstruction time and saving oncontract budgets.

282

C R E A T I V E S O L U T I O N SCONTOUR WALLS


Introduction

Contour WallsFor prestigious interiors, such asmultiplex cinemas, leisure complexesor luxury hotels, Lafarge drywallsystems provide new opportunitiesfor creating attractive andsophisticated three-dimensionalforms.

Because of its 6mm thickness –Lafarge Contour wallboard isflexible enough to create curveswithout the need for specialist toolsor site practices. Lafarge Contourwallboard can be used dry to formcurves with radii down to 1000mmor, when wetted, with a radius assmall as 600mm. Standardwallboards may also be curved ifwetted, achieving a range ofcurvatures depending on theirthickness, from 2000mm for 15mmthick plasterboard down to 1000mmfor 9.5mm thick wetted plasterboard.

Tight radius two-way curves can beachieved by using two layers ofLafarge Contour wallboard to formcomplex three-dimensional shapes,without any requirement forwetting. This technology enables allsitework to be carried out quicklyand economically, without the needfor expensive prefabricated fibrousplaster panels or messy and timeconsuming wet-plaster trades.

For installation details refer topage 153.

Tight radius two-waycurves are achieved onthis feature spiralstaircase by using twolayers Lafarge Contourwallboard to form acomplex three-dimensional shape,without any requirementfor wetting.

Visitors to this five starhotel are immediatelystruck by the towering 36metre high atrium. Eachfloor has a curvedwalkway and dadoheight balustradelooking onto theentrance area.

All the balustrades andassociated wall liningsare created using Lafargestandard wallboardsfixed to Cormet DrylinerChannels and CormetMetal Studs.

Installation of thesystems called forparticularly highstandards of precision insetting out and detailingto achieve the smooth,uninterrupted flow ofthe curving balustrades.


C R E A T I V E S O L U T I O N SWHAT CAN GO WRONG

283

6

What can go wrong

Items to check

1. Is there a detailed dimensional layout for the Lafarge Fresco panels?

Careful planning and setting out can avoid wasting time and materials duringinstallation.

2. Have the position of fixtures such as electrical sockets been planned?

Fixtures, and items such as electrical socket outlets, switches, television andtelephone outlets should be positioned to fall within the flat surfaces of the panels.

3. Is horizontal framing provided for fixing the Lafarge Fresco panels?

The Fresco panels should be supported at all four edges.

4. Has Lafarge Firecheck wallboard been used as infill around the LafargeFresco panels?

Firecheck has the same performance as the Fresco Panels.

5. When using Lafarge wallboard with Lafarge Cove, is the wallboard squareedged with bound edges outward?

It is easier to achieve a neat, straight edge with bound edges rather than cut edges.

6. Has a 12.5mm wallboard been provided behind the Lafarge Profiles?

This is necessary where the fire and acoustic performance of the partition has to bemaintained.


(✓) (✓)

284



Case study

FINISHING 7

286

F I N I S H I N GINTRODUCTION


Lafarge Finishing Systems

Lafarge Deco System*

The Lafarge Deco system is a uniquefinishing system comprising pre-sealed plasterboard and a pre-sealedjoint compound. Once installed andjointed the Deco system is ready fordecoration, eliminating the need fora coat of sealer.

Lafarge Taping and Jointing

The Lafarge Taping and Jointingsystem is used for the seamlessjointing of plasterboards. Oncejointed, the finished surface shouldbe sealed ready to accept directdecoration.

Lafarge Supreme Skim Plaster

Lafarge Supreme Skim plaster is agypsum based high quality plasterfinish for skim plastering toplasterboard.


Lafarge Universal Texture provides acrack-resistant textured, decorativefinish to interior walls and ceilings.

Note:

* Lafarge Plasterboard does notrecommend the use of gloss,eggshell, silk or sheen paints in-linewith BS 8212: 1995. However, shouldyou choose to use such finishes,Lafarge recommend the use of anadditional coat of Lafarge UniversalSealer on the Deco Systems.

The use of matt finish paints arelikely to produce a superior finish.

Contents

The Deco System 287

Taping and jointing 291

Skim plastering 301

Texture 305

Ready reckoner 308

System selection


Residential: New Housing■ ■ ■ ■

Flats■ ■ ■ ■

Renovation■ ■ ■ ■

Commercial: Offices■ ■ ■

Entertainment■ ■ ■

Institutional■ ■ ■

Shops■ ■ ■

Industrial: Factories■ ■ ■

Warehouses■ ■ ■

Specials: Cinemas■ ■ ■

Hospitals■ ■ ■

Lafa

rge

Dec

o

Lafa

rge

Tapi

ng a

nd

Join

ting

Lafa

rge

Supr

eme

Skim

Pla

ster

Lafa

rge

Text

ure


F I N I S H I N GDECO SYSTEM

287

7

Deco is a range of pre-sealed boardsand colour-matched joint cementswhich create a consistent white finishready for final decoration.

As the boards are factory-sealed there isno requirement for a separate sealer*coat to be applied on-site, translating totime and labour savings.

The Deco range includes threewallboards:

• Predeco, for ‘standard’ applicationssuch as housing

• Megadeco, which meets the highersystem performance requirements ofcommercial, industrial environments,hospitals and schools

• Hydrodeco, for use where moistureresistance is needed.

* Lafarge Plasterboard does not recommend the use of gloss, eggshell, silk or sheenpaints in-line with BS 8212: 1995. However, should you choose to use such finishes,Lafarge recommend the use of an additional coat of Lafarge Universal Sealer on theDeco Systems.

288



Lafarge Deco SystemThe Lafarge Deco system is acomplete lining and finishingsystem, used as a quality alternativeto conventionally sealed wallboards.

The Deco system consists of a pre-sealed wallboard used with PredecoJoint Filler and Deco Joint Cement.

The Deco system uses a factory-sealed paper board liner with aunique purpose-designed coating,combined with colour matched jointcements so that, once constructed,linings and partitions have a pre-sealed consistent white appearanceready for final decoration.*

The Deco wallboard and Decojointing compounds togetherprovide a wallboard surface readyfor direct decoration without theneed for site-applied drywall sealersand primers.

The environmental performancecriteria, cutting and fixing of Decowallboard are identical to those ofstandard wallboard.

Components

The main components of the systemare:

• pre-sealed wallboard

• special pre-sealed jointingcompounds

• pre-sealed cove

LimitationsThe Deco system is not compatiblewith a plaster finish.

*Paint application

Lafarge Plasterboard does notrecommend the use of gloss,eggshell, silk or sheen paints in-linewith BS 8212: 1995. However, shouldyou choose to use such finishes,Lafarge recommend the use of anadditional coat of Lafarge UniversalSealer on the Deco Systems.

The use of matt finish paints arelikely to produce a superior finish.

Introduction

Table 7.1 Deco System ComponentsPredeco Joint Filler Description Pack size

12.5 kg bags

Deco Joint Cement Description Pack size

20 kg

Deco Machine Description

20 kg

Predeco Description

Megadeco Description

Hydrodeco Description

Lafarge Predeco Cove Description

A unique setting compound for bedding tapesand filling joints on the Deco range of boards. It must be over coated with Deco Joint Cement or Deco Machine.

Also for bedding Lafarge Tape-On Corner beadsand Lafarge Flex Tape.

A unique pre-mixed two-coat, air-drying cement.Designed for bedding tapes and finishing jointson the Deco range of boards. Can be applied byhand or mechanical jointing and sanded with150/120 grit sandpaper.

Lafarge wallboard with Deco pre-sealed surface.

Combines properties of Firecheck, dBcheck andToughcheck with Deco pre-sealed surface.

Lafarge Moisturecheck with Deco pre-sealedsurface.

Lafarge Cove with Deco pre-sealed surface.

A unique pre-mixed air-drying cement designedfor bedding tapes and finishing joints on theDeco range of boards. Formulated for usethrough automatic taping tools. Sand with150/120 grit paper. May be hand applied.



289

7

Application details

Table 7.2 Jointing compound suitabilityProduct Bedding Second Finishingname coat coat coat

Pre-Deco Joint Filler ✓ ✓ –

Deco Joint Cement ✓ Not needed ✓

Machine Deco Joint Cement ✓ ✓ ✓

Jointing Methods

2 x Deco Filler & 1 x Deco JointCement – Ref TJ17

• Most widely used combination. Asthe filler has a setting time of 90 minutes this allows the secondcoat to be over-coated in 90 minutes

• Deco Joint Cement must be usedto provide the pre-sealed featuresof the system. There are bothmachine and hand appliedversions available

• Final coat of Deco Joint Cementor Deco Machine Joint Cement,drying time vary on atmosphericconditions because this is an air-drying compound

Full operation with Deco JointCement/Deco Machine JointCement – Ref TJ18

• Mostly used where machinetaping is required

• Drying time vary on atmosphericconditions because this is an air-drying compound

Other jointing products on Decoboards

• Only those compounds shown intable 7.2 are suitable on Decoboards. Lafarge cannot warrantythe adhesion of other compoundsto Deco boards.

The Deco System is not compatiblewith a plaster finish.

Deco System – Tape and joint operation complete

Traditional system – Tape and joint operation complete

290




Lafarge Deco SystemTaping and jointing the decoratingface of Lafarge Deco pre-sealedplasterboards.

Additional Clauses

Add general clauses, see Section 8, ifrequired, for:

• Health and Safety

• Storage and materials


NBS clauses



Location ……………………………………Client reference ……………………………………Joint TapeLafarge Paper Joint Tape, width 50mm with centre crease.

Edge BeadsLafarge Edging Bead, reference BEAD EDGE ………, or

Lafarge Tape-Ons Stop Bead ……… mm.

Internal/external corner protectionLafarge Flex Tape for external angles, or

Lafarge Tape-On Beads Type ……… for internal/external angles.

Edge Beads and Tape-Ons manufactured in accordance with requirements ofBS 8212: 1995.

Jointing compoundsPredeco Joint Filler

Deco Joint Cement

Deco Machine Joint Cement

ApplicationApplication to be in accordance with Lafarge Plasterboard’s instructions. Vinylbased compounds may be applied over gypsum based bedding coats, butgypsum based compounds must not be applied over vinyl based compounds.

Finished tolerancesFinished tolerances to be in accordance with BS 8212: 1995 section 3, figure 3.


Notes:




F I N I S H I N GTAPING AND JOINTING

291

7

Taping and jointing is the quick, professional, quality approachto finishing drywall systems. Purpose-designed tape bedding and filling compounds, offer either three coat or two coatformulations, are markedly quicker and require less drying time,than skim plastering.

292



Lafarge Taping and JointingSystemLafarge Taping and Jointing systemis used to create continuous seamlessplasterboard walls and ceilings usingeasy application methods, includingtwo stage systems. It is used forjointing:

• Tapered edge wallboard

• All internal and external cornerjoints

• Lafarge Fresco

• Lafarge Profiles

Jointing Compounds

Product Types

There are three different types ofjoint compounds:

Air-drying:

• New Pure Velvet

• Readymix Lite

• FineForm Mid-Weight

• Rapid Sand

Air-drying products are limestonebased. Drying times will depend onclimatic conditions.

Lafarge offer both powderedproducts (New Pure Velvet andRapid Sand) and ready mixedproducts (FineForm Mid-Weight andReadymix Lite)

Air-drying compounds are oftenused as the finishing coat due to theproduct being easy to sand. Theycan also be used for bedding andfilling.

Air-drying products are not suitablefor Flex Tapes or Tape-on beads andshould not be used as a sub coatprior to the application of settingcompounds.

Setting Compounds:

• Fast Set

Fast Set is a gypsum-based jointingcompound with a 90 minute settime. Fast Set should be used for thebedding and filling coats during thejointing process. Fast Set is notrecommended as a finishing coat, asit is difficult to sand.

Drying/Setting Compounds:

• Easy Finish

Easy Finish combines the qualities ofair-drying and setting compounds. Itis a gypsum-based product with a 90minute set time, but unlike Fast Set,it can be used as a finishing coat asit is easily sanded. With Easy Finishthe jointing process can becompleted in two stages instead ofthe usual three.

Introduction

Table 7.3 Jointing compoundsFast Set Description Pack size

12.5 kg bags

Easy Finish Description Pack size

10 kg bags

Rapid Sand Description Pack size

22.5 kg bag

New Pure Velvet Description Pack size

25 kg bags

FineForm Mid-Weight Description Pack size

20 kg bucket

Readymix Lite Description Pack size

20 kg bucket

Joint Tape Description Pack size

150m roll

Flex Tape Description Pack size

33m roll

Corner 90º Tape-On Bead Description Pack size

50 lengths

per carton

Sanding Paper Description Pack size

Packs of 50 sheets

Gypsum based jointing compound with a 90 minutessetting time for bedding tapes and filling joints.

Also suitable for bedding Lafarge Tape-on Cornerbeads and Lafarge Flex Tape.

Fast Set cannot be used in automatic tapingmachines. Sand with 120 grit paper.

An air-drying lightweight powder compound forhand or machine application.

A light weight air-drying compound for beddingtapes and finishing joints, either by hand orusing a machine. Rapid Sand allows the jointingoperation to be completed in two stages. Sandwith 120/150 grit paper.

Vinyl based pre-mixed jointing compound forair-drying applications. Suitable for beddingtapes and finishing joints by the Premier orsimilar automatic taping tools or by hand.Sand with 120 grit paper.

A setting/drying compound for hand jointingonly. It cannot be used in automatic tapingmachines. Used for bedding external cornerprotection (Lafarge Tape-on-Corner Beads andLafarge Flex Tape), bedding tapes and finishingjoints. Sand with 120/150 grit paper.

A lightweight air-drying pre-mixed jointcement for hand or mechanical jointing.Used for bedding tapes and finishing joints.Two coat application due to low shrinkageformulation. Sand with 120 grit paper.

White perforated cross-fibre paper tape forreinforcing joints. Suitable for hand ormechanical application with Lafarge jointingcompounds.

Silicon carbide open coat 120 and 150 gritsanding paper. For use with hand or polesanders. Size 100 x 250mm.

An air-drying powdered compound for beddingtapes and finishing joints as a three-stageapplication not suitable for bedding cornerprotection. Can be applied over Fast Set as afinish and sanded with 150 grit paper.Can be applied by hand or mechanical methods.

Flex Tape is cross fibre paper tape reinforcedwith rust-resistant steel strips for theprotection of irregular external corner angles.

Wax coated pre-formed 90º corner protectionTape-On bead, paper tape reinforced withgalvanised metal for protection of externalcorners and board edges.



293

7

Application details

Table 7.4 Use of jointing compoundsCorner Bedding Filling Finishing Sandingtape tape coat coat paper

Fast Set ✓ ✓ ✓ ✗✗ 120 grit

Rapid Sand* ✗✗ ✓ Not required ✓ 150 grit

FineForm Mid-Weight* ✗✗ ✓ ✓ ✓ 120 grit

New Pure Velvet ✗✗ ✓ ✓ ✓ 150 grit

Easy Finish ✓ ✓ Not required ✓ 120 grit

Readymix Lite* ✗✗ ✓ Not required ✓ 150 grit

* Whilst air-drying compounds are suitable for filling joints, it is necessary to leave adequate drying time between each coat.

Tapered edge board jointing

Lafarge Joint Tape beddedin Lafarge jointingcompound

Jointing compound struckoff flush with the face ofplasterboard

Final coat of jointingcompound feathered out50 to 60mm beyondsecond coat

Second coat of jointingcompound feathered out50 to 60mm beyond firstcoat

Allow to set hard or dry fully, thenapply a second coat of jointingcompound over the joint, featheringout 50 to 60mm beyond the edgesof the first coat. Allow this to sethard or dry fully, then complete thejoint with a further coat of jointingcompound feathered out 50 to60mm beyond the second coat.

Finally, finish the joint by sandingsmooth with Lafarge 120 or 150 gritsanding paper and seal the entirewallboard surface and joint withLafarge Universal Sealer or, if avapour control layer of no greaterthan 15 MNs/g is required, two coatsof Lafarge Drywall Sealer may beapplied to the finished surface.

JointingIt is recommended that jointing iscarried out in the followingsequence:

1. Internal angles

2. Tapered edge joints

3. Cut edge joints

4. Finally external angles.

Jointing can be carried out manuallyor by Premier Internationalautomatic taping machine usingLafarge compounds and tapes.

Lafarge manufacture three types ofjoint compounds:

• Air-dying compounds

• Setting compounds

• Combined drying/settingcompounds.

Air-drying compounds are RapidSand, FineForm Mid-Weight andReadymix Lite. These compoundsare suitable for use in PremierInternational automatic taping toolsor similar machine application.

Setting compounds such as Fast Setcan be used to increase the speed ofthe jointing process. Use Fast Set tobed the tapes and fill the joints.Once dry over coat with an air-drying compound.

Easy Finish is a 2-coat drying/settingcompound, which is used to fill andfinish the joint in two coats.

Setting compounds may not be usedin automatic taping machines unlessthe machines are designed to acceptsetting compounds.

Never use air-drying compoundsbeneath setting compounds, as thebedding coat may not dry outproperly.

Tapered edge board joints: hand application

Apply Lafarge Jointing Compoundto the joint. Cut Lafarge Joint Tapeto length, centre the tape over thejoint and press the tape firmly intothe compound.

Lafarge Joint Tape is ready creasedfor use on internal angles; alwaysbed the face with the crease lineinto the compound. Take care toavoid trapping air bubbles andensure that there is at least 1mmbed of jointing compound and strikeoff flush with the plasterboard face.

Two Coat compounds (Easy Finish,Readymix Lite and Rapid Sand)

Apply compound to the joint. CutLafarge Joint Tape to length, centrethe tape over the compound andpress the tape firmly into thecompound. Take care to avoidtrapping air bubbles and ensure thatthere is at least a 1mm bed ofcompound and strike off (fill) flushwith the plasterboard face. Allow todry fully, and apply a second coat ofthe same compound over the firstfeathering out 50-60mm beyond theedges of the first coat.

Finally finish the joint by sandingand sealing as detailed before.

300mm approx

294



Application methodsThe type of product used depends on the way the jointer works. Jointers fall into two categories:

Hand taping and jointing Machine jointing – Premier International automatic taping tools

Flat joints Paper tape Paper tape bedded with air-drying compound (always air-drying compound)

Covered in two coats of setting compound or one coat followed by 7”, 10” or 12” boxes

of setting compound and one coat of air-drying joint cement

Finished with one coat of air-drying joint cement

Internal corners Paper tapes bedded with air-drying or setting compound Paper tapes bedded with air-drying compound

Covered with setting or air-drying joint cement Finished with air-drying compound

Finished with one coat of air-drying joint cement

External corners Flex tape bedded with setting compound Flex tape bedded with setting compound

Filled with setting or air-drying joint cement Filled with setting compound or air-drying joint cement

Finished with one coat of air-drying joint cement Finished with air-drying joint cement

Application details

Flat joints – tapered edge

Flat joints – square and cut edge joints

Jointingcompound

Lafarge JointTape bedded inLafarge jointingcompound

First coat of LafargeJointing Compoundstruck off withplasterboard face

Second coat of Lafargejointing compoundfeathered out beyondfirst coat

Finishing coat ofLafarge jointingcompound featheredout 50 to 60mmbeyond second coat


LafargeJointingcompound

Fill withLafargeFast Set

Square edgewallboard

Tapered edgewallboard

First coat of Lafargejointing compounddown edge of JointTape

Second coat of Lafargejointing compoundfeathered out beyondfirst coat

Finishing coat ofLafarge jointingcompound featheredout onto plasterboardface

200mm

200mm

300mm approxNote: If using a two coat Lafargejointing compound product thereis no requirement for the secondcoat process



295

7

Application details

Internal angles

External angles

Jointingcompound


First coat of jointingcompound struck offwith plasterboard facewith the tape beddedinto compound

Second coat of jointingcompound featheredout beyond first coat

Finishing coat ofjointing compoundfeathered out beyondsecond coat

LafargeFast Set orEasy Finish

Lafarge Tape-On Beador Lafarge Flex Tapebedded in

First coat of LafargeFast Set or Easy Finishfeathered out with thetape bedded intocompound

Second coat of LafargeFast Set or final coatof Easy Finishfeathered out

Final coat of jointingcompound featheredout if using a threecoat application

296



Corner and edge protectionProper treatment of corners andedges is very important. LafargeTape-On gives a superior appearanceand stronger finish that resistsimpact and cracking forces. Itcombines the ease and speed ofapplication of a flexible tape withthe strength of a rigid bed. Theexposed paper surface gives goodjointing compound adhesion.

Tape-On Corner

For sharp external angles.

External angle 90º, supplied in 2400and 3000mm lengths.

External Corners

Protect external angles with LafargeTape-On rigid corners. For small orirregular reveals and angles useLafarge Flex Corner Tape.

Apply a 50mm wide band of FastSet on each side of the angle. Cutthe corner section to length and bedin around the angle. Strike off flushwith the plasterboard face, thenallow to set hard. Apply furthercoats of jointing compound asabove.

Follow a similar procedure forLafarge Flex Corner Tape.

NOTE: Taping and jointing shouldnot be carried out at extremetemperatures (greater than 40ºC or less than 5ºC). Do not tape and joint on frozenbackgrounds.

Application details

Tape-On Corner, 90º external corner

Two layer board layout, externalcorner

Tape-On Stop Bead 9.5 and 12.5mm

Edge Bead 9.5 and 12.5mm

Machine application

In automatic taping machines alwaysuse Lafarge FineForm Mid-Weight,Rapid Sand or Readymix Lite. Donot use a setting compound such asLafarge Fast Set and Easy Finish.This may be used only in thefinishing boxes designed to acceptsetting compounds.

Vertical joints

Run the machine up from thebottom of the wall, maintainingcontact with both wheels. Stop andcut the tape 100mm from the ceilingbefore completing the run. Wipedown tapes with a broad knife andallow to dry.

Ceiling joints

Tape butt joints before taperededge joints. For the first 150mmkeep both wheels on the surface tobed the tape, then tilt the machineslightly so only one wheel is incontact and move the machinebackwards. Tilting the machine willminimise spillage. Replace bothwheels on the surface before cuttingthe tape and completing the run.Wipe down tapes with a broad knifeand allow to dry.

Finishing

Apply the first finishing coat with175mm (7”) box. Start vertical jointsat the ceiling and run down toabout knee height. Lock the handleand run the box back up from thefloor to complete the joint. Onceiling joints run to about 700mmfrom the opposite wall beforereversing the direction of the box.

Final coats are applied with 250mm(10”) and 300mm (12”) boxes. Thejoint cement must be dry beforeapplying a further coat. Adjust thecrown on each box to distribute thecorrect amount of compound foreach coat.

Nail spotting

Use the nail spotter to fill all nailand screw depressions.

Sand with Lafarge 120 or 150 gritSanding Paper and seal with LafargeUniversal Sealer or Lafarge DrywallSealer.

Cut edge joints

Keep cut edge joints to a minimum.If exposed cut edges cannot beavoided treat edge with a PVACbonding agent prior to jointing.Lightly sand cut edges to removeany paper burrs. Carry out jointingas for tapered edges.



297

7

Application details

Jointing Methods – 3 coat

2 x Fast Set & 1x Rapid Sand orNew Pure Velvet – Ref TJ10

• Most popular system as thecomponents are the most costeffective to combine, popular innew housebuilding.

• 3 coat system

• First two coats will set in 90 minutes per coat

• Final coat of New Pure Velvet orRapid Sand, drying time variesdepending on atmosphericconditions

• New Pure Velvet or Rapid Sandused to “top out” the joint as it is a finer and easier to finishcompound and Fast Set is only for filling and bedding

• The final coat can be machineapplied

2x Fast Set & 1x FineForm Mid-Weight– Ref TJ11

• Popular method for contractorswho prefer to use ready mixedcompounds to finish

• 3 coat system

• First two coats will set in 90 minutes per coat

• Final coat of Fine From Mid-weight, drying time variesdepending on atmosphericconditions

• Readymix used to “top out” thejoint as it is a finer and easier tofinish compound and Fast Set isonly for filling and Finishing

• The final coat can be machineapplied

3 x Readymix – Ref TJ16

• 3 stage application

• May be machine or hand applied

• Drying time on each coat will be dependent on atmosphericconditions as FineForm Mid-Weightis an air-drying compound

Jointing Methods – 2 coat

2 x Readymix Lite – Ref TJ12

• 2 coat application due to very lowshrinkage properties of ReadymixLite

• Machine or hand appliedapplication

• Drying time varies depending onatmospheric conditions

• Readymix Lite is an easy to sandcompound

2 x Easy Finish – Ref TJ13

• 2 coat application due to lowshrinkage properties of EasyFinish

• Hand applied only due to set time(90 minutes)

• Full operation possible as EasyFinish is easy to sand

• Cost effective and quickcombination

• Joints can be completed in 180 minutes

1 x Easy Finish & 1 x ReadymixLite – Ref TJ14

• 2 coat application due to lowshrinkage properties of bothproducts

• Final coat can be 10” or 12”boxed by machine or handapplied

2 x Rapid Sand – Ref TJ17

• 2 coat application

• May be machine or hand applied

• Drying time on each coat will bedependent on atmosphericconditions as Rapid Sand is an air-drying compound

Note: The second coat of any 3 coat jointing method can be replaced using asuitable air-drying joint cement.

298




Lafarge Taping and JointingSystemsTaping and jointing the decoratingface of plasterboards using LafargeJoint Tape and Lafarge jointingcompounds.

Additional Clauses





NBS clauses



Location ……………………………………Client reference ……………………………………Joint TapeLafarge Paper Joint Tape, width 50mm with centre crease.

Edge BeadsLafarge Edging Bead, reference BEAD EDGE ………, or

Lafarge Tape-Ons Stop Bead ……… mm.

Internal/external corner protectionLafarge Flex Tape for external angles, or

Lafarge Tape-On Beads Type ……… for internal/external angles.

Edge Beads and Tape-Ons manufactured in accordance with requirements ofBS 8212: 1995.

Jointing compoundsLafarge Fast Set

Lafarge New Pure Velvet

Lafarge FineForm Mid-Weight

Lafarge Easy Finish

Lafarge Readymix Lite

Lafarge Deco Joint System

Lafarge Rapid Sand

(Note: Use only Lafarge Fast Set to bed Lafarge Tape-On Corner Protection.)

Sealer coatLafarge Drywall Sealer or Lafarge Universal Sealer applied across wholedrylined surface by brush/roller in one/two coats to coverage raterecommended by Lafarge. (One coat is sufficient for decorating. Two coats ofLafarge Drywall Sealer will provide a small amount of vapour resistance.)

ApplicationApplication to be in accordance with Lafarge Plasterboard’s instructions. Vinylbased compounds may be applied over gypsum based bedding coats, butgypsum based compounds must not be applied over vinyl based compounds.

Finished tolerancesFinished tolerances to be in accordance with BS 8212: 1995 section 3, figure 3.


Notes:





299

7

Installation

Internal AnglesUsing a 4” tapingknife, apply jointingcompound to bothsides of internal angle.

Internal AnglesBed paper joint tapeinto corner and covertape with jointingcompound, strikingoff flush with theplasterboard face.

Internal AnglesWhen tape has sethard or fully dried,apply a second coat of jointing compound,feathering out beyondthe edges of thefirst coat.

Internal AnglesWhen set hard andfully dried, apply afinishing coat of air-drying compound,feathering outbeyond the edges ofthe second coat.Now allow joint todry fully.

Tapered JointsApply jointingcompound totapered joint.

Tapered JointsBed paper joint tapeinto the compoundand cover tape withjointing compound,striking off flush withthe plasterboard face.

1

2

3

4

5

6

Tapered JointsWhen set hard orfully dried, apply a second coat ofjointing compound,feather out beyondthe edges of the first coat.

When set hard or fullydried apply a finishingcoat of air-dryingcompound,feathering outbeyond the edges of the second coat. Now allow joint todry fully.

Square EdgeJointsWhen taping squareor cut edges, afterbedding the tapeapply a 200mm bandof jointing compounddown the edges ofeach side of the joint tape.

7

8

300



External AnglesUsing a 4” tapingknife, apply a 50mmwide band of FastSet or Easy Finishon each side of the angle.

External AnglesBed tape onto thecorner. Once bedded,cover each side ofthe tape with a100mm band of FastSet or Easy Finish,feathered out ontoplasterboard face.

Apply a second coatof Fast Set or EasyFinish, feathered out50 to 60mm beyondthe edges of the firstcoat.

External AnglesWhen set hard, apply a finishing coat of air-dryingcompound or EasyFinish, feathered out 50 to 60mmbeyond the secondcoat.

Now allow to dryfully.

13

14

15

Installation

Square EdgeJointsWhen set hard orfully dried, apply a second coat ofjointing compound250mm wide, downthe edge of each sideof the joint tape.

Square EdgeJointsWhen set hard orfully dried, apply a finishing coat of air-drying compoundover the entire joint,covering tape andfeathering out ontoplasterboard face.

Square EdgeJointsUsing a LafargeJointing Sponge,clean all edges ofjointing compoundon finishing coats to minimise sanding.Now allow joint todry fully.

External AnglesUsing tin snips, cutLafarge Flex Tape tolength. Pre-creasetape so that the heatbonded metal stripsface in towardsplasterboard.

9

10

11

12 Installation details on Lafargesystems are also available in theLafarge Installation Guide oronline at: www.lafargeplasterboard.co.uk


F I N I S H I N GSKIM PLASTERING

301

7

Lafarge plasterboards are designed toaccept skim plasters with ease,allowing this approach to finishing tobe adopted wherever a ‘traditional’appearance is preferred.

Skim plastering offers little benefitover drywall finishing using taping andjointing techniques but remainspopular in some parts of the country.

302



Lafarge Supreme SkimPlasterLafarge Supreme Skim is an ivorycoloured gypsum based finishplaster for internal use. It can beapplied to plasterboardmanufactured to BS 1230: Part 1: 1985to produce a high quality finish.Lafarge Supreme Skim should beused on Lafarge plasterboard ivoryface.

• Suitable for use on most types ofplasterboard

• If Moisture Resistant plasterboardis to be skimmed, a coat of50%PVA/water must be appliedand skimmed whilst tacky

• Not suitable for use on sand andcement backgrounds

• Not suitable for use on gypsumbacking coat plasters

Authority

Lafarge Supreme Skim conforms toBS 1191: Part 1: 1973, GypsumBuilding Plasters, Class B, Types b1and b2.

Composition

Lafarge Supreme Skim is a newgeneration formulation of materials,based on gypsum semi-hydrateproducing a high standard plasterproduct.

Lafarge Supreme Skim’s uniquecharacteristics enables it to be mixedmore easily than other plasters, andless powder is used for the samecoverage. It is also easier to applyand can be trowelled to a matt orsemi-polished finish.

Size

Lafarge Supreme Skim is supplied in25 kg bags.

Fire Protection

Lafarge Supreme Skim, when testedto BS 476: Part 4: 1970 and EuroclassA1 is classed as non combustible andsatisfies the requirements for Class 0in accordance with the NationalBuilding Regulations 1992, and theBuilding Standards (Scotland)Regulations 1990, when tested to BS 476: Part 6: 1981 and Part 7: 1971.

Conditions of use

Lafarge Supreme Skim should beused in accordance with BS 5492:1990, Code of Practice for InternalPlastering, and BS 8000: Part 10: 1989.However, the surface temperature inuse must not exceed 40ºC.

For full details see table 7.5.

Plasterboards

Ivory face

Lafarge Supreme Skim should beapplied to a minimum thickness of2mm. Joints to be reinforced withLafarge Joint Tape.

Grey face (Baseboard and Lathonly)

Lafarge Supreme Skim should beapplied to a minimum thickness of3mm. Joints to be reinforced withLafarge Joint Tape.

Mixing

All tools and buckets should beclean and all water used should beof drinking quality.

Sprinkle Lafarge Supreme Skim,minimising dust, onto the water andmix to a suitable creamy consistency,ensuring no lumps remain.

Lafarge Supreme Skim plastershould always be mixed in wellventilated conditions.

Application

This is the recommended six stepmethod for skimming plasterboard.The italic text denotes the LafargePlasterboard best practicerecommendation.

1 Board InstallationFix the wallboard using either aframed or direct bond installationmethod – ensuring that a 2-3mmgap has been left between theboard abutments.

2 Treating the jointsUsing a trowel or taping knife,generously apply a gypsum-basedsetting compound to the taperedarea of the board. Press Lafarge Joint Tape firmlyinto the compound to create agood bond and remove anyexcess material – fill the taperedarea of the boards with compoundand flatten down with a trowel.

3 Lay onWhen the joint filler starts to set,lay on a thickness of between 2 to5mm of Skim Plaster in 1 coat or 2 layers – minimum thickness 2mm.

4 Flatten downYou can flatten down when theplaster starts to pick up – youshould flatten down with a drytrowel to achieve a flat appearance.

Table 7.5 ApplicationsBackground Minimum thickness

front face (mm)

Wallboard 2

Baseboard 3

Plank 2

Firecheck 2

Panelplus 2

Vapourcheck wallboard 2

Vapourcheck baseboard 3

Vapourcheck Firecheck 2

Lath 3

Thermalcheck 2

Thermalcheck XP 2

Thermalcheck K 2

Vapourcheck Thermalcheck 2

Moisturecheck 2*

* Pre-treatment with a PVAC bonding agent is requiredprior to the application of the plaster finish

Other plasterboards may be used provided they conformto BS 1230 and have been so tested. If in doubt contactthe Lafarge Technical Enquiryline (01275) 377789

Table 7.6 CoverageThickness Coverage(mm) (m2 per 25 kg bag)

2 11

3 7.3

5 First trowelRepeat step 4, but this time witha wet trowel.

6 Second trowelBy repeating step 5 a qualityfinish can be achieved bytrowelling – care should be takennot to over work the plaster withthe trowel as this can lead to ahighly polished plaster finish,which can be more difficult toapply a paint finish.

Decoration

Lafarge Supreme Skim plastershould be allowed to dry outthoroughly before decoration isstarted. Paint manufacturer’sinstructions should be followed fordecorating on to new plaster.

Storage and Site Conditions

Lafarge Supreme Skim plaster has ashelf life of three months. It shouldbe stored in dry, well ventilatedconditions, ensuring adequateventilation at all times. The stockshould be rotated, using the oldestfirst.

All sacks and pallets should behandled with care to avoid tearingthe sacks.

Store on dry timber pallets. Do notstore in direct contact with concretefloors. Avoid storing on dampsubstrates.

Plastering should not be carried outat extreme temperatures (greaterthan 40ºC and less than 5ºC). Inparticular Lafarge Supreme Skimmust not be used on frozenbackgrounds.

Introduction



303

7


Lafarge Supreme SkimPlastersLafarge Supreme Skim is a lightcoloured gypsum based finishplaster. It can be applied toplasterboard backgrounds toproduce a high quality finish.Lafarge Supreme Skim should beused on Lafarge plasterboard ivoryface.

Additional Clauses





NBS clauses



Notes:



Location …………………………………………………………………BackgroundThe background of ……… shall be clean of dust, dirt and grease, reasonablydry, and sufficiently true to allow the finished surface of the specified thicknessof plaster to meet the tolerances required.

Pre-treatmentApply PVAC bonding agent to BS 5270 in accordance with Lafarge technicalliterature. (Insert in pre-treatment required)

Finish coat plasteringLafarge Supreme Skim Plaster to BS 1191: Part 1: 1973, Class B, Types B1 and B2.Thickness ……… mm, applied in accordance with Lafarge Plasterboard’sinstructions.

Joint TapeLafarge Paper Joint Tape, width 50mm with centre crease. (Specify for finishedcoat on plasterboard)

Tolerances of finished surfacesTolerance of finished surface shall be in accordance with BS 5492: 1977,paragraph 37 Trueness of the Plastering System.

Corner and edge protectionLafarge Duo Bead

Lafarge Edging Bead

Plastering bead to be Type ……… by ……… all to BS 6452.


304



MixingAdd the powder toclean water and mixit with a drill whiskor plunger until youachieve a creamyconsistency.

Treat jointsUsing a trowel ortaping knife,generously apply aSupreme Skimgypsum-based settingcompound to thetapered area of theboard. Press LafargeJoint Tape firmly intothe compound andflatten with a trowel.

Lay onLay on a thicknessof 2-5mm in one ortwo coats, minimum2mm depth.

Flatten downYou can flattendown when theplaster starts to pickup. You shouldflatten down with adry trowel toachieve a flatappearance.

First trowelRepeat stage 4, butthis time use a wettrowel. You mightfind that withLafarge SupremeSkim plaster a firsttrowel can be donelater than with othersimilar products.

Second trowelBy repeating stage 5,a quality matt orsemi-polished finishcan be achieved bytrowelling.

– You will find it setsin 11/2 - 2 hours.

1

2

3

4

5

6

Installation



F I N I S H I N GTEXTURE

305

7

Textured finishes may be used tocreate a wide range of decorativeeffects. Primarily specified inbathroom and kitchen environments,they may also be adopted to disguiseunevenness or cracking in olderceilings. Lafarge textured finishes areeasily applied and are formulated toallow practical on-site setting times.

306



Lafarge Universal TextureLafarge Universal Texture provides atextured decorative finish to wallsand ceilings.

Composition

Lafarge Universal Texture is a vinyl-based white texture to provideexcellent pattern quality withoutshrink-back or slop.

Size

Lafarge Universal Texture is suppliedin 25 kg bags.

Fire spread

Lafarge Universal Texture is definedas Class 0 in accordance with theNational Building Regulations 1991Approved Document B1/2/3/4/5 FireSafety and Building Standards(Scotland) Regulations 1990,Regulation D2 when tested to BS 476: Part 6: 1989 and Part 7: 1987and is non-combustible when testedin accordance with BS 476: Part 4:1970 and Euroclass A1.

Application

There are many common texturepatterns in use, which can beclassified as regular, random orfeature patterns. Achieving thedesired pattern quality is largelydependent on the skill andexperience of the workman.

Installation

Typically Lafarge Universal Texture isapplied to the ivory face ofplasterboards and it isrecommended that a 2-3mm gap isleft between the plasterboards andthe following installation sequenceis carried out:

Apply Lafarge Universal Texture tothe joints and press Lafarge JointTape firmly into the texture. Takingcare to avoid trapping air bubbles,strike off flush with the plasterboardface, ensuring that the Lafarge JointTape is fully bedded. Fill screw headswith texture and allow to fully dry.

Apply Lafarge Sealertex or LafargeUniversal Sealer over the entireplasterboard surface; this will helpto equalise the porosity of thesurface and will increase theworking time of the UniversalTexture. Allow to dry fully beforeapplying a coat of Universal Texture.

Apply the Lafarge Universal Textureevenly to a small area (in bands upto about 500mm - 20” wide) with abrush or roller; then form thetexture pattern required, continueworking in small areas making sure

Introduction

Circle

Shell

Stipple

Scroll

Fan

Circle with fan

Swirl

Bark

to blend in the pattern as you movefrom one area to the next.

Form a margin at least 13mm -1/2”wide around all perimeters with a brush.

Note: in humid areas such asbathrooms and kitchens refer to paint manufacturer’s recommendations for suitable paint finishes.



307

7

Lafarge Universal TextureMay be applied to any dryliningspecification.

Additional Clauses

Add general clauses, in Section 8, ifrequired, for:




NBS clauses




Location ……………………………………BackgroundThe background shall be clean, dry and free from dust, dirt and grease. Ifsurface other than new plasterboard is to be textured telephone Enquirylineon: 01275 377789.

Textured coatingLafarge Universal Texture coating applied in accordance with LafargePlasterboard’s instructions.

Joint tapeLafarge Paper Joint Tape

Sealer coatLafarge Sealertex or Lafarge Universal Sealer applied across whole drylinedsurface by brush/roller in one single coat to coverage recommended bymanufacturer.

OverpaintingOver paint, once the texture is completely dry, according to paintmanufacturer’s instructions. (In kitchens and bathrooms overpainting with awashable emulsion paint is recommended.)

Health and safetyAll recommendations contained in the Lafarge Plasterboard Health and SafetyData Sheet shall be followed. (See Lafarge COSHH Data Sheets; also HSE’sCONDAM data, to include disposal of waste product).

Storage of materialsThe recommendations of BS 8212: 1995, Section 5, paragraph 31must becomplied with, all materials used must be within their “Use by” date.

Site conditions and workmanshipProvide adequate, continuous ventilation to areas where texturing has beencarried out until texturing is completely dry.

Site conditions to be in accordance with BS 8212: 1995, Section 5, paragraph28-35. Texturing must not be carried out in temperatures less than 5ºC.

Workmanship to be in accordance with BS 8212: 1995, Sections 3 and 6, and BS 8000: Part 8: 1994.


Notes:



308

F I N I S H I N GREADY RECKONER


Coverage information

Table 7.7 Coverage and ready reckonerProduct Pack size Approximate coverage per pack Shelf life

Fast Set 12.5 kg bag 25m2 for filling and bedding 4 months

37m2 as a bedding coat 4 months

Easy Finish 10 kg bag 25m2 for a full taping operation 4 months

47m2 as a finishing coat 4 months

Rapid Sand 22.5 kg bag 64m2 for a full taping operation 6 months


New Pure Velvet 25 kg bag 55m2 for a full taping operation 6 months


FineForm Mid-Weight 20 kg 45m2 for a full taping operation 6 months


Readymix Lite 20 kg 50m2 for a full taping operation 6 months


Universal Texture 25 kg 30-40m2 depending on pattern 6 months

Supreme Skim 25 kg 10m2 depending on thickness 3 months

Sealertex 10 litres 100-300m2 depending on water ratio 12 months

Universal Sealer 10 litres 100m2 12 months

Drywall Sealer 10 litres 100m2 one coat 12 months

70m2 two coat 12 months

Deco Joint Cement 20 kg 50m2 for a full taping operation 6 months

167m2 as finishing coat 6 months

Deco Machine 20 kg 62.5m2 for a full taping operation 6 months

168m2 as finishing coat 6 months

Predeco Joint Filler 12.5 kg 25m2 for filling and bedding 4 months

PRODUCT SPECIFICATION 8

310

P R O D U C T S P E C I F I C A T I O NINTRODUCTION


Lafarge plasterboards

The Lafarge range offers a widechoice of plasterboards for variedapplications.

Deco systemThe Deco system is a range of pre-sealed tapered edge plasterboards.The factory coated paper iscombined with matching Decocompounds to eliminate therequirement to seal the wallboards.Predeco can be substituted for allstandard boards.Megadeco is the performance Decowallboard combining the propertiesof Firecheck, dBcheck andToughcheck wallboard.Hydrodeco can be substituted forMoisturecheck boards.

Toughcheck wallboard is a heavyduty plasterboard for use in activeenvironments such as schools,hospitals and hotels.

dBcheck and MR dBcheckwallboards are heavy wallboardswith improved acousticperformance.

Echeck wallboards are especiallydesigned for use within dwellings as defined by the latest ApprovedDocument E Regulations

Firecheck and MR Firecheckwallboards offer a higher degree of fire resistance than Standardwallboard.

Firecheck Coreboard is used inLafarge fire protection systems forenclosure of shafts and encasementof structural steel.

Standard wallboards with taperedor square edges are available in awide range of sizes. Plank is 19mmthick, 600mm wide Standardwallboard used in the constructionof high performance partitions and floors.

Acoustic Homespan wallboard is foruse with the Acoustic Homespansystem. 15mm thick 900mm wide.

Square edge baseboard and roundedge (lath) form a base for gypsumplastering.

Vapourcheck wallboard has ametallised film bonded to one face,which acts as a vapour control layerand can also give improved thermalperformance.

Moisturecheck wallboard isdesigned for those areas wheremoisture and humidity resistance are required, including bathroomsand kitchens.

Contour wallboard is a 6mm thickplasterboard designed for use onpartitions and ceilings where curvedsurfaces are required.

Thermalcheck board is a range ofplasterboard thermal laminatescomprising plasterboard bonded todifferent types of insulation to suit a variety of thermal requirements.

Summary of suitable applications for Lafarge wallboards

Stan

dard

wal

lboa

rd

Eche

ck

Pred

eco

wal

lboa

rd

Plan

k

Ther

mal

chec

k

Moi

stur

eche

ck

Vapo

urch

eck

Fire

chec

k

Aco

usti

c H

omes

pan

dBch

eck

Meg

adec

o w

allb

oard

Hyd

rode

co w

allb

oard

MR

Fire

chec

k Fi

rech

eck

Core

boar

d

Toug

hche

ck

Cont

our

wal

lboa

rd

MR

dBch

eck

BS 1230: 1985 Type 1 5 3,4 5 1 3,4 1 5 3,4,5 3,4,5 1 1 1 3,4 1 3,4 1 –

BS EN 520 A F,D,I D,H1 F,D,I D,I D,H1,I D D,F,I D,F,H1,I D,F,H1,I A A D D,H1 – H1 A –

Linings

Direct Bond ✔ ✔ ✔ ✔ ✔ ✔ ✔* ✔* ✔**

Contour Linings ✔ ✔

Cormet Dryliner ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Independent Wall Lining ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Linings to Timber frame ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Partitions

Homespan ✔ ✔

Timber Stud Partitions ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Metal Stud Partitions ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Curved Metal Stud Partitions ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Metal Stud High Performance ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Floors and Ceilings

Timber Frame ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Cormet Acoustic Floor ✔ ✔ ✔ ✔ ✔

Cormet Dryliner ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Cormet Suspended Ceilings ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔

Fire Protection

Cormet Shaftwall ✔ ✔ ✔ ✔ ✔ ✔

Cormet Encasements ✔ ✔ ✔ ✔ ✔

* Not a typical application

** Lafarge Multi Purpose Adhesive should be used in place of bonding compound as the adhesive

MR

Aco

usti

c H

omes

pan


P R O D U C T S P E C I F I C A T I O NCONTENTS

311

Contents page

Lafarge wallboards 312

Lafarge compounds 324

Lafarge screws 327

Cormet metal components 329

Cormet accessories 335

Cove 337

Lafarge profiles 338

312

P R O D U C T S P E C I F I C A T I O NLAFARGE WALLBOARDS


Pred

eco

wal

lboa

rdM

egad

eco

wal

lboa

rdH

ydro

deco

wal

lboa

rdTo

ughc

heck

MR

dBch

eck

dBch

eck

Eche

ck

MR

Fire

chec

k

Fire

chec

k

Fire

chec

k Co

rebo

ard

Stan

dard

wal

lboa

rdPl

ank

Base

boar

d

Aco

usti

c H

omes

pan

MR

Aco

usti

c H

omes

pan

Vapo

urch

eck

Moi

stur

eche

ck

Cont

our

wal

lboa

rd

Range of board sizes

MR

Base

boar

dLa

th

Key:

T Tapered edge

S Square edge

R Round edge

Ther

mal

chec

k (a

ll ty

pes)

Thickness Width Length(mm) (mm)

6.0 1200 2400 T

9.5 600 1200 R

600 1220 R

900 1220 S S

900 1800 T S T S T S

900 2400 T S

1200 2400 T T S T S

1200 2700 T S

1200 3000 T S

12.5 600 1200 R

600 1220 R

900 1800 T S T S T S

900 2400 T S

1200 1800 S

1200 2350 T

1200 2400 T T T T T T T S T S T S T T

1200 2500 T T

1200 2700 T T T T T S T S T

1200 3000 T T T T T T T S T S T

1200 3600 T T

15.0 900 1800 T T S

900 2400 T T S T T

900 2700 T T

1200 1800* T

1200 2400 T T T T T S T T

1200 2700 T T T T

1200 3000 T T T T T T

19.0 600 2400 T S

600 2700 S

600 3000 S

25.0 600 3000 S

* Predeco only

Thickness Width Length(mm) (mm)

15.0 400 1300 T

1200 800 T T

1200 1200 T T

1200 1600 T T

Fres

co M

ain

Wal

l Pan

el

Fres

co W

ains

cot

Pane

l

Fres

co G

rand

Wai

nsco

t Pa

nel

Fres

co C

eilin

g Pa

nel

Fres

co G

rand

Mai

n W

all P

anel

Fres

co S

tair

wal

l Pan

el

Fres

co G

rand

Cei

ling

Pane

l

Range of Fresco board sizes

Lafarge Deco Plasterboard SystemThe Lafarge Deco system uses a pre-sealed paper board liner with a uniquepurpose-designed coating combined withcolour matched joint cements so that,once constructed, linings and partitionshave a consistent white appearanceready for final decoration. Use of Deco,therefore, eliminates the requirement for separate sealing of the wallboard

on-site, effectively saving one completeoperation, whilst maintaining highquality standards.

The Deco system comprises of a range of three boards:

Predeco can be substituted for allstandard wallboard applications

Predeco wallboardLafarge Predeco wallboard has onedecorative white face with taperededges and a grey faced back liner.

Principal applications

Lafarge Predeco wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings.

Authority

Lafarge Predeco wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboardType 1 and BS EN 520: 2004 Type A.

Weights

Board weights are:

9.5mm thickness 6 to 7 kg/m2


15mm thickness 9.8 to 11 kg/m2

Fire properties

Lafarge wallboards are defined as Class O in accordance with the National BuildingRegulations 1991 and meet Euroclasse A2.Refer to the performance tables elsewhere inthis publication for quoted fire resistance periods.

Thermal insulation

Thermal conductivity (λ) is 0.18 W/mK.

Thermal resistance (R) values are:

9.5mm thickness 0.052 m2K/W


15mm thickness 0.083 m2K/W

Sound insulation

Lafarge wallboards have shown, throughindependent testing, to offer excellent levelsof sound reduction when compared totraditional products. Refer to theperformance tables elsewhere in thispublication for quoted acoustic performance.

Finishing

The white face is pre-sealed and suitable fordirect decoration, after seamless taping andjointing with Lafarge Deco jointingcompounds only.

The Deco system is not suitable for skimplaster finish.

Paint application – Matt finish paints arelikely to produce a superior finish.

Note: Specialist gloss, eggshell and silkfinishes will highlight irregularities in thesurface finish. To reduce this risk, apply acoat of Lafarge Universal Sealer beforeapplying finish.

Megadeco is the performance Decowallboard combining the propertiesof Firecheck, dBcheck and Toughcheck

Hydrodeco can be substituted forMoisturecheck wallboard applications

The Deco system is not suitable forplaster skim finish.



313

8

Hydrodeco wallboardLafarge Hydrodeco wallboard has onedecorative white face with taperededges and a green faced back liner.


Lafarge Hydrodeco wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings that require superiormoisture resistance such as bathrooms.

Authority

Lafarge Hydrodeco wallboard complies withBS 1230: Part 1: 1985 for gypsum wallboardTypes 3 and 4 and BS EN 520: 2004 Type D,H1.

Weight

Board weight is:

12.5mm thickness 10.5 kg/m2

Fire properties


Thermal properties




Sound insulation


Finishing





Megadeco wallboardLafarge Megadeco wallboard has onedecorative white face with taperededges and a grey faced back liner.


Lafarge Megadeco wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings that require superioracoustic, fire and impact performance.

Authority

Lafarge Megadeco wallboard complies withBS 1230: Part 1: 1985 for gypsum wallboardType 5 and BS EN 520: 2004 Type F, D, I.

Weights

Board weights are:

12.5mm thickness 11 kg/m2

15mm thickness 12.5 to 13.1 kg/m2

Fire properties


Thermal insulation

Thermal conductivity (λ) of LafargeMegadeco wallboard is 0.25 W/mK. Thermal resistance (R) values are:



Sound insulation

Lafarge wallboards have shown, throughindependent testing, to offer excellent levelsof sound reduction when compared totraditional products. Refer to theperformance tables else where in thispublication for quoted acoustic performance.

Breaking strength of board

Minimum breaking for 15mm thickness:

Transverse 445 N

Longitudinal 895 N

Finishing





314



Echeck wallboardLafarge Echeck wallboard has onedecorative light blue face with taperededges and a grey faced back liner.


Lafarge Echeck wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings especially designed foruse within dwellings as defined by the latestApproved Document E regulations.

Authority

Lafarge Echeck wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboard Type 1 and BS EN 520: 2004 Type D.

Weight

Board weight is:

12.5mm thickness not less than 10 kg/m2

Fire properties

Lafarge wallboards are defined as Class O in accordance with the National BuildingRegulations 1991 and meet Euroclasse A2.Refer to the performance tables elsewhere in this publication for quoted fire resistanceperiods.

Thermal properties




Sound insulation



Minimum breaking for 12.5mm thickness:

Transverse 265 N

Longitudinal 620 N

Finishing

The light blue face is suitable for seamlesstaping and jointing with Lafarge jointingcompounds, or for the application ofgypsum plasters manufactured to BS 1191:Part 1: 1973 Class B, Type b1 and b2.

dBcheck wallboardLafarge dBcheck wallboard has onedecorative blue face with tapered edgesand a grey faced back liner.

Lafarge Moisture Resistant dBcheck hasone decorative blue face with taperededges and a green faced back liner-please note this is manufactured tospecial order only.


Lafarge dBcheck wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings that require superioracoustic performance.

Authority

Lafarge dBcheck wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboardType 1 and BS EN 520: 2004 Types D and I.

Lafarge Moisture Resistant dBcheckwallboard complies with BS 1230: Part 1:1985 for gypsum wallboard types 3 and4and BS EN 520: 2004 Types D, H1 and I.

Weights

Board weights are:

12.5mm thickness 10.2 to 10.7 kg/m2

15mm thickness 12.5 to 13.1 kg/m2.

Fire properties


Thermal properties




15mm thickness 0.060 m2K/W.

Sound insulation

Lafarge wallboards have shown, throughindependent testing, to offer excellent levels ofsound reduction when compared to traditionalproducts. Refer to the performance tableselsewhere in this publication for quotedacoustic performance.


Minimum breaking for the following thickness:12.5mm 15mm

Transverse 265 N 355 N

Longitudinal 550 N 685 N

Finishing

The blue face is suitable for seamless tapingand jointing with Lafarge jointing compounds,or for the application of gypsum plastersmanufactured to BS 1191: Part 1: 1973 Class B, Type b1 and b2.

A surface treatment of PVA and water shouldbe applied prior to an application of plaster toMoisture Resistant dBcheck. Please refer to thePVA manufacturer for guidance.

Toughcheck wallboardLafarge Toughcheck wallboard has onedecorative mustard face with taperededges and a mustard faced back liner.


Lafarge Toughcheck wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings that require superioracoustic, fire and impact performance.

Authority

Lafarge Toughcheck wallboard complies with BS 1230: Part 1: 1985 for gypsumwallboard Type 5 and BS EN 520: 2004Types F, D and I.

Weight

Board weight is:


Fire properties

Lafarge wallboards are defined as Class O in accordance with the National BuildingRegulations 1991 and meet Euroclasse B.Refer to the performance tables elsewhere in this publication for quoted fire resistanceperiods.

Thermal properties




Sound insulation

Lafarge wallboards have shown, throughindependent testing, to offer excellent levelsof sound reduction when compared totraditional products. Refer to theperformance tables elsewhere in thispublication for quoted acousticperformance..



Transverse 400 N

Longitudinal 1010 N

Finishing

The mustard face is suitable for seamlesstaping and jointing with Lafarge jointingcompounds, or for the application ofgypsum plasters manufactured to BS 1191:Part 1: 1973 Class B, Type b1 and b2.

Lafarge plasterboards are high-qualitygypsum wallboards suitable for theconstruction of metal and timber studpartitions as well as ceilings, direct bondand structural steel framing. They consistof a gypsum plaster core bondedbetween two strong liner papers.

The purity of the gypsum corecontributes to the performance of theplasterboards, such as high strength, light weight, rigidity and workability.

The standard wallboards thus performwell over a range of environmentalconditions. Excellent handlingcharacteristics also ease installation on-site, reducing the number of damagedboards and wastage.

The high strength, quality liner papersare manufactured from recycled wastepaper and coloured to aid identification.

Adjusting the core composition of thesewallboards produces a range of

Performance Boards that retain all the benefits of the Standard wallboardsbut with enhanced qualities designed to meet the performance requirements of specific applications.

This section provides an insight into the extra performance achieved throughthe substitution of Standard wallboardwith Lafarge Performance Boards.

Lafarge Performance Boards



315

8

Firecheck CoreboardLafarge Firecheck Coreboard has greenpaper liners, with square edges.


Lafarge Firecheck Coreboard is a highstrength plasterboard for use in the LafargeShaftwall and Column and Beam system forsteelwork fire encasement.

Authority

Lafarge Firecheck Coreboard complies with BS 1230: Part 1: 1985 for gypsum wallboardTypes 3, 4 and 5 and BS EN 520: 2004 TypesD, F, H1 and I.

Weight

Board weight is:


Fire protection


Thermal properties


Thermal resistance (R) value is:


Sound insulation


Firecheck wallboardLafarge Firecheck wallboard has onedecorative pink face with tapered edgesand a grey faced back liner.


Lafarge Firecheck wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings that require superior fireperformance.

Authority

Lafarge Firecheck wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboard Type 5 and BS EN 520: 2004 Types D, F and I.

Weights

Board weights are:



Fire properties

Lafarge wallboards are defined as Class O in accordance with the National BuildingRegulations 1991 and meets Euroclasse A2.Refer to the performance tables elsewhere inthis publication for quoted fire resistanceperiods.

Thermal properties





Sound insulation



Minimum breaking for the following thickness:12.5mm 15mm

Transverse 300 N 390 N

Longitudinal 625 N 655 N

Finishing

The pink face is suitable for seamless tapingand jointing with, Lafarge jointingcompounds, or for the application of gypsumplasters manufactured to BS 1191: Part 1:1973 Class B, Type b1 and b2.

Moisture Resistant FirecheckLafarge Moisture Resistant Firecheckwallboard has one decorative pink facewith tapered edges and a green facedback liner.


Lafarge Moisture Resistant Firecheckwallboard is suitable for installation with stud partitions, lining systems and ceilingsthat require superior fire and moistureresistance.

Authority

Lafarge Moisture Resistant Firecheckwallboard complies with BS 1230: Part 1:1985 for gypsum wallboard Types 3, 4 and 5and BS EN 520: 2004 Types D, F, H1 and I.

Weights

Board weights are:



Fire properties


Thermal properties





Sound insulation




Transverse 400 N

Longitudinal 730 N

Finishing

The pink face is suitable for seamless tapingand jointing with Lafarge jointing compounds,or for the application of gypsum plastersmanufactured to BS 1191: Part 1: 1973 Class B, Type b1 and b2.

A surface treatment of PVA and watershould be applied prior to an application ofplaster to Moisture Resistant Firecheck,please refer to the PVA manufacturer forguidance.

316



Standard wallboardLafarge Standard wallboard has onedecorative ivory face available witheither tapered edge or square edgeprofile and a grey faced back liner.


Lafarge Standard wallboard is suitable forinstallation with stud partitions, liningsystems and ceilings.

Authority

Lafarge Standard wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboardType 1 and BS EN 520: 2004 Type A.

Weights

Board weights are:




Fire properties


Thermal properties






Sound insulation


Finishing

The ivory face is suitable for seamless tapingand jointing with Lafarge jointing compounds,or for the application of gypsum plastersmanufactured to BS 1191: Part 1: 1973 Class B, Type b1 and b2.

Lafarge PlankLafarge Plank has one ivory faceavailable with either tapered edge orsquare edge profile and a grey facedback liner.


Lafarge Plank is suitable for the drylining ofwalls, acoustic floors and ceilings and for theconstruction of stud partitions.

Authority

Lafarge Standard wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboardType 1 and BS EN 520: 2004 Type A.

Weights

Board weights are:


Fire properties


Thermal properties




Sound insulation

Lafarge Plank has shown, throughindependent testing, to offer an exceptionaldegree of sound insulation. The soundinsulation will vary with the application andnumber of layers used. Refer to theperformance tables elsewhere in thispublication for quoted acoustic performance.

Finishing


Lafarge BaseboardLafarge Baseboard is a square edgedgypsum wallboard with grey faces bothsides. The Vapourcheck Baseboard has ametallised polyester film on one face.


Lafarge Baseboard is suitable as a lining onceilings requiring skim plastering.

Authority

Lafarge baseboard complies with BS 1230:Part 1: 1985 for gypsum wallboard Type 6and BS EN 520: 2004 Type P.

Weights

Board weights are:


Fire properties


Thermal properties




Sound insulation


Finishing

The grey faces are suitable for theapplication of gypsum plasters manufacturedto BS 1191: Part 1: 1973 Class B, Type b1and b2.



317

8

Acoustic HomespanAcoustic Homespan has one decorativeivory face available with tapered edgeand a grey faced back liner.


Lafarge Acoustic Homespan is suitable forthe construction of Acoustic Homespanpartitions.

Authority

Lafarge Acoustic Homespan wallboardcomplies with BS 1230: Part 1: 1985 forgypsum wallboard Type 1 and BS EN 520:2004 Type D.

Lafarge Moisturecheck Acoustic Homespanwallboard complies with BS 1230: Part 1:1985 for gypsum wallboard Type 3 and 4and BS EN 520: 2004 Type D and H1.

Weights

Board weights are:


Fire properties

Lafarge wallboards are defined as Class O in accordance with the National BuildingRegulations 1991 and meets Euroclasse A2.Refer to the performance tables elsewhere in this publication for quoted fire resistanceperiods.

Thermal properties


Thermal resistance (R) value is:


Sound insulation

Cormet Acoustic Homespan Studs andAcoustic Homespan wallboard have beenshown through testing to be capable ofproviding a sound insulation of 40 RwdB, inaccordance with BS EN ISO 717-1: 1997.



Transverse 280 N

Longitudinal 630 N

Finishing


Lafarge LathLafarge Lath is a round edge gypsumwallboard with grey faces both sides.


Lafarge Lath is suitable as a lining board onceilings requiring skim plastering.

Authority

Lafarge Standard wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboardType 6 and BS EN 520: 2004 Type P.

Weights

Board weights are:



Fire properties


Thermal properties





Sound insulation


Finishing

The grey faces are suitable for theapplication of gypsum plasters manufacturedto BS 1191: Part 1: 1973 Class B, Type b1and b2.

Vapourcheck wallboardLafarge Vapourcheck wallboard has onedecorative ivory face available witheither tapered edge or square edgeprofile and a silver metallised polyesterback liner.


Lafarge Vapourcheck wallboard is suitablefor installation with stud partitions, liningsystems and ceilings.

Authority

Lafarge Vapourcheck wallboard complies withBS 1230: Part 1: 1985 for gypsum wallboardType 1.

Weights

Board weights are:




Fire properties


Thermal properties


Thermal resistance (R) values, includingthermal resistance of both Vapourcheckboard and a 25mm cavity- when themetallised film is facing an empty cavity.




Water vapour resistance

The water vapour resistance of LafargeVapourcheck wallboard exceeds 100 MNs/gwhen tested in accordance with BS EN ISO12572: 2001.

Sound insulation


Finishing


318



FrescoLafarge Fresco consists of a gypsumplaster core with glass fibres and fillers.It has one decorative face with theembossing on the surface which iscoloured pink, emphasising the Firecheckproperties. The face is suitable for directdecoration. It is available with arecessed edge for taping and jointing.


Lafarge Fresco creates a panelled effect oninternal wall and ceiling linings, partitionsand even shaftwall linings.

Authority

Lafarge Fresco complies with BS 1230: Part 1: 1985 for gypsum wallboard Type 5.

Weights

Board weights are: 12.0 to 12.8 kg/m2.

Fire properties

Fresco is made using 15mm FirecheckWallboard but due to the embossing processcarries only the same fire performance as a12.5mm Firecheck Wallboard and meetsEuroclasse A2.

Thermal properties

Thermal conductivity (λ) is 0.25 W/mK.Thermal resistance (R) value is 0.063 m2K/W.

Sound insulation

Lafarge Fresco wallboard has improvedsound resisting properties over LafargeWallboard.

Finishing

The pink face is suitable for seamless tapingand jointing with, Lafarge jointingcompounds.

Moisturecheck wallboardLafarge Moisturecheck wallboard hasone decorative green face with taperededges and a green faced back liner.


Lafarge Moisturecheck wallboard is suitablefor installation with stud partitions, liningsystems and ceilings that require superiormoisture resistance.

Authority

Lafarge Moisturecheck wallboard complieswith BS 1230: Part 1: 1985 for gypsumwallboard Types 3 and 4 and BS EN 520:2004 Type H1.

Weights

Board weights are:



Fire properties

Lafarge wallboards are defined as Class O in accordance with the National BuildingRegulations 1991 and meet Euroclasse A2.Refer to the performance tables elsewhere inthis publication for quoted fire resistanceperiods.

Thermal properties

Thermal conductivity (λ) is 0.24 W/mk.Thermal resistance (R) values are:



Sound insulation




Transverse 245 N

Longitudinal 565 N

Finishing

The green face is suitable for seamlesstaping and jointing with Lafarge jointingcompounds, or for the application of gypsumplasters manufactured to BS 1191: Part 1:1973 Class B, Type b1 and b2.

A surface treatment of PVA and watershould be applied prior to an application ofplaster to Moisturecheck wallboard. Pleaserefer to the PVA manufacturer for guidance.

Contour wallboardLafarge Contour wallboard is alightweight, high strength 6mm thickplasterboard consisting of a glass mineralwool reinforced plater core bondedbetween two strong liner papers. It hasone ivory face with tapered edges,suitable for direct decoration or gypsumskim coat plastering.


Lafarge Contour wallboard enables curvedfeatures in wall linings, partitions and ceilingsto be created simply. It allows tight radiuscurves to be achieved on-site with speed,economy and ease without the expense ofcustom made components.

Lafarge Contour wallboard is also ideal for re-lining backgrounds which are in soundcondition, providing a very slim, cost-effectivesurface for direct decoration.

Weights

Board weights are:


Fire properties

Two layers of Lafarge Contour wallboard havefire resistance properties at least equivalent toone layer of 12.5mm lafarge Standardwallboard. Lafarge Contour wallboard hasbeen shown through testing to be capable ofproviding an excellent degree of fireresistance, depending on application.

Sound insulation

Two layers of Lafarge Contour wallboard havesound resistance properties at least equivalentto one layer of 12.5mm Lafarge Standardwallboard.

Finishing




319

8

Thermalcheck boardsA plasterboard thermal laminatecomprising 9.5mm plasterboard bondedto insulation.


Lafarge Thermalcheck can be used as adrylining to external masonry walls or toupgrade existing constructions, loft spaces,ceilings or renovations.

Authority

Lafarge Standard wallboard complies with BS 1230: Part 1: 1985 for gypsum wallboardType 1.

Polystyrene complies with the requirementsof BS 3837: Part 1 and 2 ‘Specification forboards manufactured fromexpanded/extruded polystyrene incorporatinga flame retardant additive’.

Weights

See tables on right for weights.

Fire properties

Lafarge Thermalcheck wallboard has beenshown through testing to be capable ofproviding an excellent degree of fireresistance, depending on the application.Thermalcheck wallboards are designatedEuroclasse B.

Thermal properties

Thermal conductivity (λ) values are:

Lafarge wallboard 0.18 W/mK

Expanded polystyrene 0.038 W/mK

Extruded polystyrene 0.030 W/mK

Phenolic foam 0.023-0.024 W/mK

See tables on right for thermal resistance ofindividual boards.

Finishing


ThermalcheckA plasterboard thermal laminate comprising 9.5mmplasterboard bonded to expanded polystyrene.

Thermal and vapour resistance and weight Thickness R value Water vapour Weight

(m2K/W) resistance (MNs/g) (kg/m2)

22.0 0.36 2.31 6.3

30.0 0.57 3.47 6.4

40.0 0.84 4.92 6.5

50.0 1.10 6.37 6.6

Note: A Vapourcheck layer can be specified with water vapour resistanceof 100 MNs/g.

Thermalcheck XPA plasterboard thermal laminate comprising 9.5mmplasterboard bonded to extruded polystyrene.



27.0 0.61 9.07 6.7

35.0 0.88 13.07 6.9

46.0 1.25 18.57 7.2

55.0 1.55 23.07 7.4

Thermalcheck KA plasterboard thermal laminate comprising 9.5mm ivoryfaced plasterboard bonded to Phenolic foam. Avapourcheck barrier is provided as standard.



30.0 0.94 114.0 7.2

40.0 1.50 114.0 7.7

50.0 1.98 114.0 8.2

60.0 2.58 114.0 8.7

70.0 3.08 114.0 9.2

Thermalcheck SheathingLafarge Thermalcheck Sheathing is a plasterboard thermallaminate comprising 12.5mm Lafarge MoisturecheckWallboard bonded to extruded polystyrene.

It is for use in framed constructions.



25.0 0.46 5.75 9.8

320



Fixing to Lafarge wallboards

Drywall constructions canaccommodate most fixturesproviding the appropriate fixings or fixing provisions are used.

Where the locations of fixtures areknown before the construction iscommenced, fixing provisions can be designed and installed into theconstruction.

Alternatively, fixtures can beattached directly to the finished drylinings using the recommendedfixings given in table 3.23.

For the medium and heavyweightfixings in table 3.23 it is veryimportant that the plasterboard iscarefully and accurately drilled andthat all fixings are installed as perthe manufacturer’s instructions.Holes should never be punched. On the bigger fixtures, it is necessaryto use a minimum of four fixings.

Table 3.23 FixturesFixture load Examples Fixing provisions* Notes

Very light Small pictures Picture hooks

Wood screws

Light Mirrors Spit Driva LD See manufacturer’s

Floor cupboards Spit Driva original literature for

Light fittings Spit Diva PlusMaximum loadings

Coat hooks Fixing channel

Medium Radiators Spit Spring Toggle See manufacturer’s

Wall cupboards Spit Hollow Anchor literature for

Water heaters Spit SatelisMaximum loadings

Sanitary ware Fixing Channel

Timber battens

Boxed studs

Extra studs

Heavy Wall mounted sanitary ware See diagrams on opposite page

Large wall cupboards

Heavy shelving

* See manufacturer’s literature for maximum loadings

Spit Driva LD

Spit Driva Original

Spit Spring Toggle

Spit Driva Plus

Spit Hollow Wall Anchor

Spit Satelis



321

8

For medium weight items

Cormet Fixing Channel or FS90/WCormet Flat Strap secured tostuds with Lafarge Wafer HeadScrews

For heavy weight items

Timber support

Vertical timber framingas required

Floor channel

300mm length ofCormet stud screwfixed back to back tomain stud with Lafargeself-tapping screws

Horizontal nogging and centralstud of sawn softwood to suit sizeof Cormet metal studs and notchedinto them and fixed through ends

Plywood support


CormetMetalAngle

Rebate onplywood

Plywood patress


Cormet U Track tosecure back of plywood

Drywalladhesive dabs

Lafarge Drywall screws100mm from stud centres

600mm min

322



Tips on installation

Board fixingFor fixing to timber, use nails orscrews as specified in tables 8.4 or 8.5.For fixing to metal, use screws asspecified in table 8.4.

Lafarge Drywall Screws

Bugle head screws for fixingplasterboard to metal or timberstuds. Lafarge Drywall Screws havea unique head design to eliminatepaper burrs and provide a flushfinish. Extra-sharp points and high-grip threads result in fastpenetration through theplasterboard and stud. The screwsare black phosphate coated andlightly oiled for protection againstcorrosion.

Lafarge Drywall High Thread Screwsare used for attaching plasterboardto timber framework.

Lafarge Drywall Self Tapping Screwsare for light gauge metal up to0.7mm thick.

Lafarge Drywall Self Drilling Screwsare for heavy gauge metal from0.7mm to approximately 2.0mm thick.

Installation

Drive Screws:



• at least 6mm in from edges oftimber framing

• at least 3mm in from the edges of metal framing.

Screw spacing: Partitions, maximum300mm. Ceilings, maximum 230mmin the field of the plasterboard,150mm at cut edges and perimeter.Linings, maximum 300mm.


thickness (mm) (mm)


15.0 40

19.0 50


12.5 + 19.0 65

15.0 + 15.0 65

Drive screws squarely through boardand into framing until screw head isjust recessed. Spot screw heads withLafarge jointing compound toprovide a flush surface.

Lafarge Pan Head Screws andLafarge Wafer Head Screws are usedprimarily for fixing Cormet metalstuds and other Cormet metalframing components together: self-tapping for light gauge metal andself-drilling for heavy gauge metal.

Lafarge Toughcheck Screws are usedfor fixing Lafarge Toughcheckwallboard.

Table 8.4 Recommended screwlengths*Construction Plasterboard Screw


Timber framing 6 32


15.0 38

19.0 41

Timber framing 6 + 6 38


12.5 + 19.0 63

15.0 + 15.0 63

Metal framing 6 25


15.0 32

19.0 38

25.0 41

Metal framing 6 + 6 25

12.5 + 12.5 38

15.0 + 15.0 44

12.5 + 19.0 51

25.0 + 12.5 57

25.0 + 25.0 63

* Except for fixing to Cormet metal furring wall channelsand Resilient Bar. See table 4.16 on page 184.

Lafarge Checkpoint Screws are usedfor fixing Lafarge Moisturecheck,dBcheck and Firecheck wallboards to light gauge Cormet metal studs.

Lafarge Drywall Nails

Zinc-coated ring shanked DrywallNails with a thin wide head formaximum board holding withoutpaper breakage. The long, sharpdiamond point ensures ease offixing. Complies with BS 8212: 1995for fixing plasterboard to timber.

Installation

Drive nails:



• at least 6mm in from edges oftimber framing.

Nail spacing: maximum 150mm (all systems).

Drive nails squarely throughplasterboard and into timber framingusing a dimple head drywall hammeruntil the nail head is just recessed.Spot nail heads with Lafargejointing compound to provide a flushsurface.

3 10 310


Fixing position at bound edges ofboards

3 13 310

Fixing positions at bound edge/cutedge joint

3 13 313

Fixing positions at cut edges ofboards











323

8

Tiling onto LafargeWallboardTiling is suitable for a wide range ofapplications with varying conditions,ranging from domestic splashbacksto shower cubicles in publicbuildings.

Ceramic tiling should be applied to Lafarge wallboards or LafargeMoisturecheck wallboard dependingon the severity of the conditions.Lafarge wallboards may be used asthe base for tiling in areas such assplashbacks behind kitchen sinks andwash hand basins. In other areaswhere there is likely to be moresplashing of water on the surface,e.g. showers, it is preferable to useLafarge Moisturecheck wallboard. If Lafarge wallboards are used itshould be treated on the face withtwo coats of Lafarge Drywall Sealer.

Where the tiling is to cover theentire drylined wall surface, squareedge boards may be used. Where an area of the drylining will remainuntiled, taper edge boards shouldbe used so that flush joints can beformed in the exposed areas; in thiscase the concealed joints should befilled with a waterproof ceramic tileadhesive.

Care should be taken to ensure thatthe framing members and liningboards offer adequate support toprevent flexing, particularly forpartitions which may be tiled on oneside only. Tiled areas not extendingdown to the floor should beprovided with horizontal supports at the base of the tiling.

Additional support requirements aregiven in table 8.6. Supports forbaths, basins and other plumbingfixtures must be providedindependently of the plasterboard.

It is essential that detailing atjunctions, angles and perimeters is designed to prevent moisturepenetration. Seal around pipes,baths, shower fittings, openings and outlets with a waterproofsilicone sealant.

Recommendations in table 8.6 applyto the use of tiles up to 12.5mmthick with a maximum weight of 32 kg/m2, fixed in accordance withBS 6431: Part 9, using a thin-bedadhesive (nominal thickness 3mm).**

Drylining systems using LafargeBonding Compound in theirconstruction should be allowed 10 days to achieve their full strengthbefore tiling.

Repairs

Minor damage to plasterboard maybe repaired by filling with LafargeFast Set and sanding smooth. Areasof damage too large for fillingshould be repaired by one of themethods below.

Cut out a rectangular piece of theboarding around the damaged areausing a fine-toothed keyhole saw.Bevel the edges of the hole inwardsat 45º with a rasp or sanding block.Cut a piece of board to the samesize as the hole and bevel the edgesto an exact fit. Apply Lafarge FastSet to the edges of the hole and fitthe patch piece in place usingLafarge Patching Tape (leave to

set for 1 hour). Finish around thepatch as described under Jointing in Section 7.

If necessary, bond a strip ofplasterboard behind the hole toprovide extra support beforeinserting the patch piece.

For larger repairs, cut a rectangularpiece of plasterboard 50mm largerthan the hole or damaged area.Place it over the hole and mark itsposition. Cut through the damagedboard along the diagonals of themarked rectangle with a fine-toothed keyhole saw; then cutthrough the paper facing aroundthe rectangle with a sharp knife,break away and remove the cutpieces of the wallboard.

Cut two backing pieces ofplasterboard and bond to the backof the boarding using Lafarge FastSet on each side of the hole; leaveto set for 1 hour.

Apply Lafarge Fast Set to thebacking pieces and fit the patchpiece of plasterboard into the holeusing Lafarge Patching Tape (leaveto set for 1 hour). Finish around thepatch as described in Section 7.

Table 8.6 Plasterboard to receive ceramic tiling (BS 8212)System Board Support Additional support Maximum

thickness centres tiling height(mm) (mm) (m)

Drylining Direct Bond 12.5 450* Horizontal dabs at 1/3 centres in height 3.6

Lafarge Dryliner 12.5 400 – 3.6

Independent 70mm I Studs 2 x 12.5 400 Mid-point support 3.0

Partitions Laminated 50, 63 – None 2.4

55, 70 – None 2.6

Timber 12.5 400 – 450 None 3.0

12.5 600 Timber noggings at 600mm vertical centres 2.4

Lafarge Cormet 50mm studs 2 x 12.5 400 None 3.6

metal stud 70mm studs 2 x 12.5 400 None 3.6

146mm studs 2 x 12.5 600 Additional studs at 300mm centres up to tile height

*Bonding compound dab row centres

**Full specification for ceramic tiling to plasterboard is available from the Tile Association, Forum Court, 83 Copers Road, Beckenham, Kent, BR3 1NR

324

P R O D U C T S P E C I F I C A T I O NLAFARGE COMPOUNDS


Lafarge Taping and JointingSystemLafarge Taping and Jointing systemis used to create continuous seamlessplasterboard walls and ceilings usingeasy application methods, includingtwo coat systems.

It is used for jointing:

• Tapered edge wallboard

• All internal and external cornerjoints

• Lafarge Fresco

• Lafarge Profiles

Jointing Compounds

Lafarge jointing compounds areexceptionally smooth to work andeasy to sand for a very fine finish.Consistent working times and strongadhesion coupled with superiorcoverage and excellent workabilityhelp produce continuous seamlessjoints.

Table 8.7 Use of jointing compoundsProduct Product Bedding Filling Finishing Sanding

type tape coat coat paper

New Pure Velvet Air-drying ✓ ✓ ✓ 150 grit

Fast Set Setting ✓ ✓ ✗

Easy Finish Air-drying, setting ✓ Not required ✓ 120 grit

FineForm Mid-Weight Air-drying ✓ ✓ ✓ 120 grit

Readymix Lite Air-drying ✓ Not required ✓ 150 grit

Predeco Filler Setting ✓ ✓ ✗

Deco Joint Cement Air-drying ✓ Not required ✓ 150 grit

Rapid Sand Air-drying ✓ Not required ✓ 150 grit

Deco Machine Joint Cement Air-drying ✓ ✓ ✓ 150 grit

Lafarge CompoundsFast Set Description Application Code reference Bag size

FAST 12.5 kg

Easy Finish Description Application Code reference Bag size

EASY FINISH 10 kg

New Pure Velvet Description Application Code reference Bag size

NPURE 25 kg

Rapid Sand Description Application Code reference Bag size

RAPID 22.5 kg

A two-stage low shrinkagecompound with a 90 minute set timefor bedding tapes and finishingjoints, Lafarge Tape-on Corner beadsand Lafarge Flex Tape as well asCorner beads. Sanded with 120 gritsandpaper. Also for bedding LafargeTape-On Corner Beads, Lafarge FlexTape and Lafarge Corner Beads.

Hand application

only

Gypsum based jointing compoundwith a 90 minutes setting time, usedfor bedding tapes and filling joints.

Also for bedding:

• Lafarge Tape-on Corner beads

• Lafarge Flex Tape

• Corner beads

Hand applicationonly.

An air-drying powdered compoundfor bedding tapes and finishingjoints as a three coat application notsuitable for bedding cornerprotection. Can be applied over FastSet as a finish and sanded with 150grit paper.

Can be applied byhand or mechanicalmethods.

A light weight air-drying compoundfor bedding tapes and finishingjoints, either by hand or using amachine. Rapid Sand allows thejointing operation to be completedin two stages. Sand with 120/150grit paper.




325

8

Lafarge Compounds (ctd)FineForm Mid-Weight Description Application Code reference Bucket size

FINEM 20 kg

Readymix Lite Description Application Code reference Bucket size

RLITE 20 kg

Universal Texture Description Application Code reference Bag size

UNITEX 25 kg

Sealertex Description Application Code reference Bucket size

SEALTEX 10 litres

Universal Sealer Description Performance Code reference Bucket size

UNISEAL 10 litres

Drywall Sealer Description Performance Code reference Bucket size

SEAL10 10 litres

Bonding Compound Description Performance Code reference Bag size

BOND25 25 kg

A lightweight air-drying pre-mixed,two coat joint cement. For beddingtapes and finishing joints.

Not suitable for bedding cornerprotection.

Can be applied byhand or mechanicaljointing, sandedwith 150 gritsandpaper.

A crack resistant decorative finish tointerior walls and ceilings.

Warm and coldwater mix

Plasterboard sealer used prior totexture finish application.

Used for sealing plasterboard priorto decoration and to seal the ivoryface prior to applying a texture finishin humid, damp or winter conditions.

It allows wallpaper to be strippedand helps prevent discolouration topaint in humid and damp conditions.

A predecoration plasterboard primerfor internal decoration. One coatprepares drywall for decoration andallows wallpaper to be stripped.

Two coats providesa vapour controllayer ofapproximately 15 MNs/g whenapplied to BS 3177.

Universal Sealerdoes not provide avapour controlbarrier.

Gypsum based Bonding Compoundused for bonding plasterboards tomasonry backgrounds, except forVapourcheck and Thermal laminates.Used to bond laminated partitionsand bonding Cormet metal furringsto masonry backgrounds.

Working time of70* minutes,setting time 110*minutes.

(* approximate)

An air-drying pre-mixed jointcompound for bedding tapes andfinishing joints as a three coatapplication.

Not suitable for bedding cornerprotection. Can be applied over FastSet or Easy Finish as a finish andsanded with 120 grit sandpaper.


Must be applied to comply with BS 8212: 1995, Code of practice for dry lining and partitioning using gypsum plasterboard.

Does not protect against condensation staining, for staining protection specify Universal Sealer.

Lafarge Compounds (ctd)Multi Purpose Adhesive Description Application Code reference Bag size

ADHESIVE 25 kg

Drywall Adhesive Description Application Code reference Bucket size

RDA5 5 litres

Supreme Skim Plaster Description Application Code reference Bag size

SKIMPLAST 25 kg

Deco Joint Filler Description Application Code reference Bag size

PDFILL 12.5 kg

Deco Joint Cement Description Application Code reference Bucket size

DCEM 20 kg

Deco Machine Description Application Code reference Bucket size

DMAC 20 kg

Cove Adhesive Description Application Code reference Bag size

COVEADH5 5 kg

COVEADH125 12.5 kg

326



A gypsum based adhesive Lafargeformulated for bonding Thermallaminates to masonry backgrounds. It is pink colour to distinguish theproduct from Lafarge BondingCompound.

Working time of 70* minutes, settingtime 110* minutes.

(*approximate)

For bonding plasterboard andthermal laminates to variousbackgrounds, including ceramic tiles,plaster backgrounds and plasterboardto plasterboard.

Lafarge Supreme Skim is a lightcoloured gypsum based board finishplaster.

It can be applied to plasterboardbackgrounds to produce a highquality finish.

A unique setting compound forbedding tapes and filling joints onthe Deco range of boards. It must beover coated with Deco Joint Cementor Deco Machine.

Also for bedding:• Lafarge Tape-On Corner bead • Lafarge Flex Tape

Cannot be used inautomatic tapingmachines.

A unique pre-mixed two-stage, air-drying joint cement. Designed forbedding tapes and finishing jointsfor the Deco range of boards.

Can be applied by hand ormechanical jointing and sanded with150 grit sandpaper.

Not suitable forbedding cornerprotection.

Lafarge Cove Adhesive is a gypsumbased compound with a 40 minutesetting time. It has exceptionalsmoothness for ease of applicationand dries white for ease ofdecoration.

Lafarge CoveAdhesive is idealfor filling andpatching LafargeCove.

Should be used on plasterboard front (ivory) face.

A unique pre-mixed air-drying cementdesigned for bedding tapes and finishingjoints for the Deco range of boards.Formulated for use through automatictaping tools.

Sand with 150/120 grit paper. May behand applied.



P R O D U C T S P E C I F I C A T I O NLAFARGE SCREWS

327

8

Lafarge Self Tapping ScrewsDrywall Self Tapping Description Length Gauge 2.5Kg Box (approx) 0.5Kg Box (approx)

(mm) Code Quantity Code Quantity

25 6 25DST25 1730 25DST5 364

32 6 32DST25 1524 32DST5 305

38 6 38DST25 1277 38DST5 255

41 6 41DST25 1222 41DST5 244

44 6 44DST25 1158 44DST5 232

51 7 51DST25 896 51DST5 179

57 7 57DST25 784 57DST5 157

63 8 63DST25 630 63DST5 126

76 8 76DST25 520 76DST5 104

Pan Head Self Tapping Description Length Gauge 2.5Kg Box (approx) 0.5Kg Box (approx)


11 6 11PHST25 1917 11PHST5 381

Trim Head Self Tapping Description Length Gauge 2.5Kg Box (approx)

(mm) Code Quantity

41 7 41THST25 1022

57 7 57THST25 744

Wafer Head Self Tapping Description Length Gauge 2.5Kg Box (approx) 0.5Kg Box (approx)


14 8 14WHST25 1495 14WHST5 299

Toughcheck Self Tapping Description Length Gauge 2.5Kg Box (approx)

(mm) Code Quantity

25 7 25NGRST25 1817

41 7 41NGRST25 1180

Checkpoint Self Tapping Description Length Gauge 2.5Kg Box (approx)

(mm) Code Quantity

25 6 25CPST25 1800

41 6 41CPST25 1175

Megadeco Self Tapping Description Length Gauge Box of 1000 screws

(mm) Code Weight (kg)

25 7 25MST16 1.61

32 7 32MST20 1.99

38 7 38MST23 2.30

44 7 44MST25 2.48

For attaching plasterboard to lightgauge metal stud partitioning (up to0.7mm) and ceiling systems.

For connecting light gauge metalcomponents (up to 0.7mm).

Self embedding screws for attachingwood trims and aluminium profilesto metal framing (up to 0.7mm).

Low profile head for connecting lightgauge metal components (up to0.7mm) beneath plasterboard.

For attaching Lafarge ToughcheckWallboard to light gauge metalpartitioning (up to 0.7mm) andceiling systems.

A Drywall screw specifically designedfor fixing high performanceplasterboards.

A zinc coated drywall screwspecifically designed for fixingMegadeco to light gauge metal andceiling systems.

328

P R O D U C T S P E C I F I C A T I O NLAFARGE SCREWS


Lafarge High Thread ScrewsDrywall High Thread Description Length Gauge 2.5Kg Box (approx) 0.5Kg Box (approx)


32 6 32DHT25 1529 32DHT5 306

38 6 38DHT25 1304 38DHT5 261

41 6 41DHT25 1239 41DHT5 247

51 7 51DHT25 898 51DHT5 180

63 8 63DHT25 619 63DHT5 124

76 8 76DHT25 576 76DHT5 107

Laminating High Thread Description Length Gauge 2.5Kg Box (approx)

(mm) Code Quantity

32 10 32LHT25 855

38 10 38LHT25 726

44 10 44LHT25 662

High Grip screws for retainingplasterboards in laminatingpartitions.

For attaching plasterboard to timberstud partitioning and ceiling joists/rafters.

Lafarge Self Drilling ScrewsDrywall Self Drilling Description Length Gauge 2.5Kg Box (approx) 0.5Kg Box (approx)


25 6 25DSD25 1662 25DSD5 332

32 6 32DSD25 1376 32DSD5 299

38 6 38DSD25 1191

44 6 44DSD25 1006

67 8 67DSD25 500

Wafer Head Description Length Gauge 2.5Kg Box (approx)

Self Drilling (mm) Code Quantity

14 8 14WHSD25 1379

Toughcheck Drywall Description Length Gauge 2.5Kg Box (approx)

Self Drilling (mm) Code Quantity

38 7 38GRSD25 1165

Pan Head Self Drilling Description Length Gauge 2.5Kg Box (approx) 0.5Kg Box (approx)


11 6 11PHSD25 2032 11PHSD5 406For connecting heavy gauge metalcomponents (up to 2mm gauge).

Low profile head for connectingheavy gauge components (up to2mm gauge) beneath plasterboard.

For use with Lafarge ToughcheckWallboard in multi-layer applicationsto heavy gauge metal wall andceiling systems (up to 2mm gauge).

For attaching plasterboard to heavygauge metal stud partitioning (up to2mm gauge) and ceiling systems.

Acoustic ScrewsAcoustic Floor Screw Description Length Gauge Box

(mm) Code Quantity

63 7 63AFST25 699 For use in the Lafarge CormetAcoustic Floor system. For fixing thefloor boards to the Cormet MetalAngles.


P R O D U C T S P E C I F I C A T I O NCORMET METAL COMPONENTS

329

8

Metal specificationsCormet metal sections are used toprovide the steel frame forplasterboard wall linings andpartitions.

The sections are available in thefollowing gauges:

R = Red gauge 0.5-0.55mm

B = Blue gauge 0.70mm

W = White gauge 0.90mm

Y = Yellow gauge 1.2mm

Cormet Metal SectionsC Stud Description Width (mm) Lengths (mm) Code reference

50 2400, 2700, 3000, 3600 CS50/R

60 2400, 2700, 3000, 3600, 4200 CS60/R

70 2400, 2700, 3000, 3300, 3600, 4200, 4800 CS70/R

90 2700, 3000, 3600, 4000, 4200 CS90/R

146 2400, 2700, 3000, 3600, 4200, 4800 CS146/R

70 3600, 4200 CS70/B

90 3600, 4200 CS90/B

146 3600, 4200, 4800, 5400, 6000 CS146/B

90 4800, 6000, 7200 CS90/W

70 4800 CS70/Y

90 3600, 4800, 6000 CS90/Y

146 6000 CS146/Y

U Track Description Width (mm) Lengths (mm) Code reference

52 3000 UT52/R

62 3000 UT62/R

72 3000 UT72/R

72 3000 UT72/B

92 3000 UT92/R

148 3000 UT148/R

U Track Deep Flange Description Width (mm) Lengths (mm) Code reference

52 3000 UDT52/B

62 3000 UDT62/B

72 3000 UDT72/B

92 3000 UDT92/B

148 3000 UDT148/B

U Track Extra Deep Flange Description Width (mm) Lengths (mm) Code reference

72 3000 UXT72/B

94 3000 UXT94/B

92 3000 UXT92/W

94 3000 UXT94/W

148 3000 UXT148/W

Galvanised metal C shaped sectionused with Cormet U Track to providesteel frame for plasterboard walllinings and partitions.

Galvanised metal U shaped sectionused with Cormet C Studs to providemetal frame for plasterboard walllinings and partitions.

R gauge tracks are fully knurled,where as B, W and Y gauge tracksare not.

Material Properties

Comply with BS 7364: 1990. Hot dipped galvanised steel to BS EN 10143: 1993 and BS EN 10142:1990 + A1:1995 designation DX51D+ Z275 NA 0.

Cold rolled to BS 2994: 1987.

36 34

Width

30

Width

50

Width

6 6

Galvanised metal U shaped sectionused with Cormet C Studs to providemetal frame for plasterboard walllinings and partitions that require adeflection head allowance or exceed4.2m in height.

70

Width

Galvanised metal U shaped sectionused with Cormet C Studs to providemetal frame for plasterboard walllinings and partitions that require adeflection head allowance or exceed4.2m in height.

330



Cormet Acoustic Homespan SystemGalvanised metal sections to provide a metal frame for the Cormet Acoustic Homespan system.

All sections are 0.5mm gauge metal (Red [R] gauge).

Acoustic Homespan Description Width (mm) Length (mm) Code referenceC Stud

44 2400 AHS44/R

50 2400 AHS50/R

Acoustic Homespan Description Width (mm) Length (mm) Code referenceStarter Stud

44 2400 CS44/R

50 2400 CS50/R

Acoustic Homespan Description Width (mm) Length (mm) Code referenceU Track

45 2400, 2700 UT45/R

52 3000 UT52/R

Acoustic Homespan Description Width (mm) Length (mm) Code referenceDeep Flange Track

45 2400 XDT45/R

52 3000 XDT52/B

Galvanised C shaped metal sectionused with Acoustic Homespan U Track to provide a metal frame forthe Acoustic Homespan System.

Acoustic Homespan Starter Studs areused at wall abutments and at dooropenings as part of the AcousticHomespan system.

Galvanised U Track is used withCormet Acoustic Homespan C Studsto provide a metal frame for theAcoustic Homespan System.

Acoustic Homespan Deep FlangeTrack is used as the floor track in theAcoustic Homespan system whenscrew fixings for the skirting boardsare required.

Cormet Metal SectionsI Stud Description Width (mm) Length (mm) Code reference

50 2400, 3000 IS50/R

60 3600, 4200 IS60/B

70 3600, 4200 IS70/B

90 6000, 7200 IS90/B

92 3600, 6000 IS92/W

Galvanised steel metal I shapedsection used with Cormet U track to provide a metal frame forplasterboard wall linings andpartitions.

40

Width

36 38

44

6 6

34 36

50

6 6

AHS44/R AHS50/R

36 38

width

26 30

45 52

UT45/R UT52/R

70

width



331

8

Cormet ShaftwallGalvanised metal sections used toprovide steel frame for the CormetShaftwall system.

All components are 0.7mm gauge (Blue [B] gauge)

CH Stud Description Width (mm) Length (mm) Code reference

60 3000, 3600, 4800 CHS60/B

90 4800, 6600 CHS90/B

146 6000, 8000 CHS146/B

E Stud Description Width (mm) Length (mm) Code reference

60 3000, 3600, 4800 ES60/B

90 4800, 6600 ES90/B

146 6000, 8000 ES146/B

J Track Description Width (mm) Length (mm) Code reference

62 3000 JT62/B

92 3000 JT92/B

148 3000 JT148/B

Lightweight steel sections positionedat floor and soffit to guide CormetCH Studs.

Light weight non-loadbearing steelsections which are installed betweenLafarge Firecheck Coreboards andprovide the bearing surface to whichwallboard is applied.

Lightweight steel sections used forstarter studs, intersections, dooropenings and end studs.

Cormet Omega Acoustic StudsA unique omega shaped stud which,when used in a Cormet partitionsystem, gives up to 3 RwdB increasedacoustic insulation over standard70mm Cormet metal studs with thesame board linings.

All sections are 0.5mm gauge metal (Red [R] gauge).

Acoustic Omega Stud Description Width (mm) Length (mm) Code reference

70 2400, 2700, 3000, 3600 AS70/R

90 3600, 3900, 4200 AS90/R

Galvanised omega shaped metalstuds used in the Omega AcousticPartition System.

34

6 6

36

Width

35

25

widths

25

25widths

35

50

widths

25

332



Cormet Dryliner ComponentsDryliner Channel Description Dimensions (mm) Length (mm) Code reference

17 x 47 2400, 2700, 3000, 3600 RD1

Dryliner Channel Description Dimensions (mm) Code referenceConnector

100 x 47 x 16 RD3

Dryliner Track Description Dimensions (mm) Length (mm) Code reference

20 x 19 x 30 3000 RD9

Standard Reach Brackets Description Dimensions (mm) Cavity width (mm) Code reference

63 x 47 x 35 25-60 RD2

XR Bracket Description Dimensions (mm) Cavity width (mm) Code reference

133 x 47 x 35 25-130 RD11

Close Reach Bracket Description Dimensions (mm) Cavity width (mm) Code reference

10 x 30 x 40 20-25 RD7

Close Reach Pin Description Dimensions (mm) Code reference

10 x 40 RD8

Ceiling System Joist Description Dimensions (mm) Maximum Code referenceConnector cavity (mm)

47 x 100 65 RD5

47 x 180 120 RD10

Metal Furring Description Dimensions (mm) Length Code referenceWall Channel (mm)

40 x 10 2260 MFWC

A galvanised steel furring channelfor plasterboard fixing. It is used inthe Cormet Dryliner and Archlinersystems.

Galvanised metal J shaped sectionused as a track or perimeter channelin the Cormet Dryliner system.

A Galvanised steel section used tobrace RD1 Dryliner Channels tosubstrate in the Cormet DrylinerSystem.

A Galvanised steel section used tobrace RD1 Dryliner Channels tosubstrate in the Cormet DrylinerSystem.

A pin/plug used for fixing RD7 CloseReach Bracket onto the CormetDryliner System.

A galvanised steel bracket used inconjunction with RD8 Close Reach Pinto support RD1 Dryliner Channels inthe Cormet Dryliner System.

A Galvanised clip used to join RD1Dryliner Channels.

Galvanised steel pressed section usedto join RD1 Dryliner Channels totimber used in Dryliner CeilingSystem.

Galvanised steel pressed section usedin Cormet Metal Furring System.



333

8

Cormet Suspended Ceiling ComponentsCeiling Channel Description Dimensions (mm) Length (mm) Code reference

102 x 25 3600 MFCC50

Primary Channel Description Dimensions (mm) Length (mm) Code reference

15 x 44 x 15 3600 MFCP44

Heavy Gauge Primary Description Dimensions (mm) Length (mm) Code reference

Channel

30 x 52 x 30 3000 UT52/Y

Edge Channel Description Dimensions (mm) Length (mm) Code reference

19 x 26 x 28 3600 MFCE26

Metal Angle Description Dimensions (mm) Thickness (mm) Length (mm) Code reference

30 x 23 0.8 3600 MFC2330

Strap Hanger Description Thickness (mm) Length (m) Code reference

0.55 25 MFCSTRAP

Connecting Clip Description Code reference

MFCCLIP

Soffit Cleat Description Code reference

MFCCLEAT

Ceiling Nut and Bolt Description Code reference

MFCNB

Galvanised steel channel used toform the Cormet Suspended Ceilingsystem.

Galvanised steel channel used tosupport the MFCC50 Ceiling Channelin the Cormet Suspended Ceilingsystem

Galvanised steel channel used toform heavy duty suspended ceilinggrids in place of MFCP44 PrimaryChannels.

Galvanised steel channel used toform the perimeter support of theCormet Suspended Ceiling system

Galvanised steel strip used as ahanger for the Cormet SuspendedCeiling system.

Galvanised steel clip for for joiningMFCC50 channels for the CormetSuspended Ceiling system.

Galvanised steel bracket used to fixangle brackets or MFCSTRAP tosubstrate for the Cormet SuspendedCeiling system.

Galvanised steel nut used to boltcleat to hangers in the CormetSuspended Ceiling system.

Galvanised steel section which canbe used in a variety of systems.

334



Cormet Acoustic BracesPhonissimo Description Performance Code reference

PHONIMO

Phonistar Description Performance Code reference

PHONI

V Brace Description Performance Code reference

VBRACE

This product is an acoustic suspendedceiling hanger bracket for use with theCormet Suspended Ceiling system.

This product is a heavy duty acousticsuspended ceiling hanger bracket foruse with the Cormet SuspendedCeiling system.

The bracket is capable of supportingservices and a secondary ceiling.

A sound and vibration isolatingstrengthening brace for twin walls andpartitions.

Acoustic Isolation: + 5 RwdB between frequencies50 hertz to 125 hertz

Maximum strength: 500 N

Acoustic Isolation: + 10 dB at frequencies 50 hertzto 1000 hertz

Maximum load: 120kg

Maximum deflection: 6.5mm±15%

Fire safety: This product will not collapse if therubber isolator should burn out.

Acoustic Isolation: + 10 dB at frequencies 50 hertzto 500 hertz

Maximum load: 50kg

Maximum deflection: 3mm

Fire safety: This product will not collapse if therubber isolator should burn out.

Cormet Acoustic FloorAcoustic Floor Clip Description Dimensions (mm) Code reference

28 x 99 RAFC25

Resilient Tape Description Dimensions (mm) Length (m) Code reference

50 x 6 12 RAFT50

Resilient Bar Description Dimensions (mm) Length (mm) Code reference

87 x 17 3000 RBD3000

Cormet EncasementsCB Clip Description To fit flange size (mm) Thickness (mm) Code reference

7-17 0.55 CB17

17-27 0.55 CB27

27-40 0.55 CB40

Lightweight steel clips friction fittedto flanges of structural steelwork inthe Cormet Column and Beam ClipSystem. Used in conjunction withMFCE26 Cormet Edge Channel.

Metal clip used in the LafargeCormet Acoustic Floor system.

Self adhesive acoustic isolation tape.

Acoustic isolation bars.

17

456

19


P R O D U C T S P E C I F I C A T I O NCORMET ACCESSORIES

335

8

Cormet Systems: AccessoriesInsulation Hold Description Roll size (m) Code reference

30 INSR

Lafarge Intumescent Description Pack size Coverage Code referenceAcoustic Sealant (linear metres)

0.9 litres 25 ACOUSTIC (INTU)

0.38 litres 10.5 ACO 38 (INTU)

Movement Control Joint Description Length (mm) Code reference

3048 MCJ 3048

Staggered Stud Clip Description Dimensions (mm) Code reference

12 x 27.5 x 38 ISC10

Fixing channel Description Dimensions (mm) Thickness (mm) Length (mm) Code reference

99 0.9 2400 MFIX

Flat Strap Description Dimensions (mm) Thickness (mm) Length (mm) Code reference

50 0.55 2400 FS50/R

90 0.8 2400 FS90/W

Metal Angle Description Dimensions (mm) Thickness (mm) Length (mm) Code reference Angle

30 x 23 0.8 3600 MFC2330 90°

25 x 25 0.8 3600 MFC2525 90°

25 x 50 0.8 3600 MFC2550 90°

50 x 50 0.8 3600 MFC135 135°

Deflection Head Bracket Description Width (mm) Thickness (mm) Depth x length (mm) Code reference

70 0.7 25 x 25 DHB70S

90 0.7 25 x 25 DHB90S

146 0.7 25 x 25 DHB146S

100 1.0 50 x 54 DHB100L

150 1.0 50 x 54 DHB150L

200 1.0 50 x 54 DHB200L

Galvanised metal channel used inlinings and partitions to providesupport for plasterboard joints andheavy fixtures.

Also provides a fire stop.

Galvanised metal flat strap used inlinings and partitions to providesupport for plasterboard joints.

Also provides a fire stop.

A spacing clip for use in Lafargepartitions with staggered I studs.

Metal supports used with timber andmetal framing to hold mineral woolinsulation.

Lafarge Intumescent Acoustic sealantis an acrylic emulsion containinginert fillers and fungicide that willintumesce when exposed to fire.Designed to be used to fill air gapsto stop sound transmission throughDrywall. Can be used to seal gapsbetween floors and skirtings oraround doors or window frames.

Metal sections fixed between boardsto control movement of up to 10mm.

Galvanised steel section which canbe used in a variety of systems.

Splayed (135°) corner support angle.

Galvanised steel bracket used indeflection head detail to secure thehead of a C Stud and prevent ittwisting.

336

P R O D U C T S P E C I F I C A T I O NCORMET ACCESSORIES


Tape-Ons, Metal Beads and TapesLafarge Tape-On beads are papertape reinforced with galvanisedmetal for protection of externalcorners and board edges. Used fortaping and jointing.

Corner 90º External Description Length (mm) Code reference

2400, 3000 90EXT

Stop Beads Description Size (mm) Length (mm) Code reference

9.5 3000 95STOP

12.5 3000 125STOP

Joint Tape Description Length (m) Code reference

150 JOINT

Patching Tape Description Length (m) Code reference

90 PATCH

Flex Tape Description Length (m) Code reference

10 FLEX

Duo Bead Description Length (mm) Code reference

2400 BEAD DUO8

3000 BEAD DUO10

Edging Bead Description Size (mm) Length (mm) Code reference

9.5 3000 BEAD EDGE95

12.5 3000 BEAD EDGE125

Galvanised steel angle bead with3mm nose for drywall cornerreinforcement.

Galvanised steel angle bead gives aneat edge to plasterboard.Perforated to provide a bed forjointing compound.

Wax coated pre-formed 90º cornerprotection.

Wax coated pre-formed drywallstop bead.

Cross fibre tape with heat bondedzinc coated steel strips for theprotection of irregular externalcorner angles or difficult situationswhere rigid angle beads are notsuitable. Used for taping and jointing.

Self adhesive tape for patchingplasterboard.

White perforated cross fibre tapefor reinforcing plasterboard joints.Suitable for hand or mechanicalapplication with Lafarge jointingcompounds.

Cormet Systems: Accessories (continued)Flex Track Description Dimensions (mm) Thickness (mm) Length (mm) Code reference

30x23 0.7 3000 MFLEX

Grommets Description Bag size Code reference

100 HRG25

Galvanised steel section designed toallow the easy construction of curvedpartitions.

25mm rubber grommet.

CovesLafarge Coving is a simple and costeffective way of adding attractiveand distinctive features to the walland ceiling junction. Designed forinternal use Lafarge Cove cancomplement many room styles.

Lafarge Cove Description Size Length (mm) Code reference

90mm 3000, 3600 COVE90

120mm 3000, 3600, 4200 COVE120

Lafarge Predeco Cove Description Size Length (mm) Code reference

120mm 3000 PDCOVE120


P R O D U C T S P E C I F I C A T I O NLAFARGE COVE

337

8

Lafarge Cove as detailed above withthe additional benefit of the LafargeDeco pre-sealed surface.

Lafarge Cove is made from plasterencased in a strong paper liner. The square back profile and puregypsum core provide high strengthand rigidity.

338

P R O D U C T S P E C I F I C A T I O NLAFARGE PROFILES


Lafarge Shadowline ProfilesShadowline Uplighter Description Dimensions (mm) Length (mm) Code reference

128 x 121.5 3000 SUS4

Uplighter Support Bracket Description Base (mm) Code reference

104 USB1

Shadowline Reveal Description Dimensions (mm) Length (mm) Code reference

12.5 3000 SWR125

25.0 3000 SWR25

Shadowline Hanging Reveal Description Dimensions (mm) Length (mm) Code reference

12.5 3000 SHR125

Shadowline Picture Hanger Description Code reference

SPH1

Shadowline Corner Step Description Dimensions (mm) Length (mm) Code reference

12.5 (double) 3000 SCS2

12.5 x 8.5 (quad) 3000 SCS4

Shadowline Skirting Description Dimensions (mm) Length (mm) Code reference

104 3000 SWB105

Shadowline Trim Reveal Description Dimensions (mm) Length (mm) Code reference

12.5 3000 STR125

25.0 3000 STR25

Shadowline Z Step Description Dimensions (mm) Length (mm) Code reference

12.5 3000 SWZ125

25.0 3000 SWZ25

Crisp stepped extrusion toincorporate linear lighting.

Provides a means of relievingruns of drywall with recessedaccent lines.

Incorporates a concealed trackfor picture and other lightweighthangings.

Allows complex corner details tobe incorporated into wall angles,ceilings, soffits and columns.

Provides a high strength rebatedskirting to the foot of apartition.

Allows the drywall linings to beeasily raised or recessed.

Enables neat architrave details tobe created around door frames,skirtings and at partitionjunctions.

Support bracket for ShadowlineUplighter.

For use with ShadowlineHanging Reveal.

Lafarge Shadowline Profiles (continued)Shadowline Edge Trim Description Dimensions (mm) Length (mm) Code reference

12.5 3000 ST125

25.0 3000 ST25

Shadowline Flex Trim Description Dimensions (mm) Length (mm) Code reference

12.5 3000 STF125

25.0 3000 STF25


P R O D U C T S P E C I F I C A T I O NLAFARGE PROFILES

339

8

Allows raised or recessed panelsor opening in walls to beconstructed with curved edges.

Sharp 90° aluminium extrusioninstalled against cut edges ofplasterboard.

Lafarge Softform ProfilesSoftform Uplighter Description Dimensions (mm) Length (mm) Code reference

128 x 121.5 3000 SU52

Uplighter Support Bracket Description Base (mm) Code reference

104 USB1

Softform Bullnose Description Dimensions (mm) Length (mm) Code reference

41.0 3000 SB75

52.0 3000 SB95

Outside Corner 90º Description Dimensions (mm) Length (mm) Code reference

64.0 3000 SO64

75.0 3000 SO76

Inside Corner 90º Description Dimensions (mm) Length (mm) Code reference

64.0 3000 SI64

75.0 3000 SI76

Curved casing to incorporate linearlighting.

Creates a smooth round finish to apartition end and projectingbulkhead.

Allows partitions and wall linings tobe constructed with 90° corners. Noadditional impact protection isrequired.

Allows partitions and wall linings tobe constructed with 90° corners. Noadditional impact protection isrequired.

For use in conjunction with theSoftform Uplighter.

340

P R O D U C T S P E C I F I C A T I O N


Case study

HEALTH & SAFETY 9

342

H E A L T H A N D S A F E T Y


Health and safety

Lafarge Plasterboard products are marketedfor use in the drylining and decoration ofdomestic, commercial and retail buildings.Detailed instructions for the use of each product are given in this manual.

In addition Lafarge COSHH Data Sheets areavailable for all Lafarge products. Contactour Technical Enquiryline on 01275 377789.

The main health and safety issues createdby the use of Lafarge Plasterboard productsrelate to working habits and conditions andthe constituents used in the products. It isimportant that Lafarge Plasterboardproducts are used only in the manner forwhich they are intended and in accordancewith Lafarge Plasterboard’s instructions.

Safe working habits and conditions willensure that occupational exposure isminimised. To reduce airborne dust, openbags and mix products with water in wellventilated conditions; avoid contact of thedry products with eyes and skin; and alwayswash exposed skin after use. In the event ofcontact with eyes, irrigate immediately withplenty of water.

Cutting plasterboard with power tools andsanding generate dust, so should be kept toa minimum. Ideally all operations whichproduce dust should be carried out in wellventilated conditions; where possible a dustmask selected in accordance with EN 149should be worn.

The general approach to control ofoccupational exposure to airborne dust isoutlined in Health and Safety ExecutiveGuidance Note EA44.

The Health and Safety Executive GuidanceNote EH40/94 gives information aboutairborne concentration of substances in theworkplace for which constant daily exposurewill not cause harmful effects, known asOccupational Exposure Standards (OES). TheHealth and Safety Executive reviews OES’sannually in the light of new medicalevidence. The following tables show theOES values relevant to constituents ofLafarge Plasterboards products, taken fromEH40/94.

Good working practice on-site will help toeliminate other potential hazards. Heavyproducts should only be lifted in the correctway using mechanical handling equipmentwhere necessary. Metal components shouldbe cut and handled carefully to avoid cutsand abrasions and Lafarge recommends thewearing of gloves.

Plasterboard is a lining material and will notsupport body weight and adequate supportshould be provided for installers wherenecessary.

When using liquid products take care toavoid contact with eyes. Should thishappen, irrigate immediately with plenty ofclean water and seek medical advice.

Further information and advice on exposurelimits, codes of practice and regulations isreadily available from:HSE Library and Information Service,2 Rose Court, Southwark Bridge, London SE1 9HSTel: 020 7717 6000.

For further information contact:

Technical Enquiryline Lafarge Plasterboard Limited Marsh Lane Easton-in-Gordano Bristol BS20 0NF

Tel: 01275 377789 Fax: 01275 377456Email: [email protected]



343

9

Table 9.1 Occupational Exposure Standards relating to constituents of Lafarge Plasterboard products, taken from EH40/94

Product Airborne hazard (dust) – Other hazardConstituent and occupational exposure limit (mg/m3)*

Gypsum Limestone Mica Man made Talc(Dolomite) fibres

10 10 10 5 10

Lafarge plasterboards Acoustic Homespan •

Baseboard •

Contour • • Glass mineral wool Skin irritation

dBcheck • • Glass mineral wool Skin irritation

Echeck • • Glass mineral wool Skin irritation

Firecheck • • Glass mineral wool Skin irritation

Firecheck Coreboard • • Glass mineral wool Skin irritation

Fresco • • Glass mineral wool Skin irritation

Hydrodeco • • Glass mineral wool Skin irritation

Lath •

Megadeco • • Glass mineral wool Skin irritation

Moisturecheck • • Glass mineral wool Skin irritation

Moisture Resistant Firecheck • • Glass mineral wool Skin irritation

Plank •

Predeco •

Standard wallboards •

Thermalcheck boards • • Glass mineral wool Skin irritation

(K only) Metallized polyester film

Toughcheck • • Glass mineral wool Skin irritation

Vapourcheck • Backed with metallized polyester film

Lafarge coves Lafarge Cove 90 and 120 • Small amounts of quartz

Lafarge Predeco Cove • Small amounts of quartz

Cormet components Metal sections Sharp edges of metal

Tapes Patching Tape Fibrous glass dust

All other tapes None

Lafarge sealants Intumescent Acoustic Sealant Acrylic polymers Harmful if swallowed

Lafarge compounds Bonding Compound •

Cove Adhesive •

Deco joint Cement • •

Deco Machine • •

Deco Filler • • •

Drywall Adhesive Acrylic polymers Harmful if swallowed

Drywall Sealer Polyvinyl acetate Harmful if swallowed

Easy Finish •

Fast Set • •

Fine Form Midweight • •

Multi Purpose Adhesive •

New Pure Velvet • • •

Predeco Joint Filler •

Rapid Sand • •

FineForm Mid-Weight • •

Readymix Lite • •

Sealertex Polyvinyl acetate Harmful if swallowed

Stucco •

Universal Sealer Polyvinyl acetate Harmful if swallowed

Universal Texture • • •

Lafarge plasters Supreme Skim • •

*Total inhalation dust, long term exposure time, 8 hour reference period

344



1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Acoustic Homespan Lafarge Baseboard Lafarge Contour Wallboard

Lafarge dBcheck Wallboard Lafarge Echeck Wallboard Lafarge Firecheck Wallboard

Lafarge Firecheck Coreboard Lafarge Fresco Wallboard Lafarge Hydrodeco Wallboard

Lafarge Lath Lafarge Megadeco Wallboard Lafarge Moisturecheck Wallboard

Lafarge Moisture Resistant Firecheck Lafarge Plank Lafarge Predeco Wallboard

Lafarge Standard Wallboard Lafarge Toughcheck Wallboard Lafarge Vapourcheck Baseboard

Lafarge Vapourcheck Wallboard

SUPPLIER Lafarge Plasterboard Limited, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF T 01275 377 773

2. COMPOSITION/INFORMATIONOF INGREDIENTS General composition:

Plasterboard: Calcium sulphate dehydrates encased within paper liners. Additionally nominalamounts of additives such as: starch, foaming agent and dispersants.

dBcheck and Contour: also contains some glass fibre.

Firecheck, Megadeco, Fresco and Firecheck Coreboard: also contains some glassfibre and vermiculite.

Moisturecheck, Hydrodeco, Moisture Resistant Firecheck and Firecheck Coreboard: alsocontains some wax.

Vapourcheck wallboards: are backed with a metallized polyester film.

3. HAZARDS IDENTIFICATION These products are defined as non-hazardous under CHIP 2000.Sawing and sanding of plasterboard will generate gypsum dust, which may irritate skin, eyesand the respiratory system.

4. FIRST AID MEASURES Inhalation:Remove person to fresh air.

Skin contact:Using clean water rinse and then wash using soap & water.

Eye contact:Wash with clean water and seek medical advise if irritation occurs.

Ingestion:Wash out month and drink plenty of clean water.

5. FIRE FIGHTING MEASURES Plasterboard has limited combustibility; however paper facings and packaging may burn.All standard fire extinguishers are suitable, using normal fire fighting procedures.

6. ACCIDENTAL RELEASE MEASURES Prevent these products from contaminating drains, watercourses, ground or soil.

7. HANDLING AND STORAGE When manually handling plasterboards, consideration of the correct manual handlingtechnique to limit risk, according to the Manual Handling Operations Regulations 1992.

Plasterboard is supplied shrink wrapped on a bearer support system or pallets. Packs should bemoved using a folk lift truck or hydraulic trolley, care should be taken to ensure that themachinery is safely capable such movements and that the operator is trained and competent.

Plasterboard should be stored in dry flat conditions, if supported on bearers these should notexceed 450mm maximum centres.

Plasterboard is not a suitable product to be used as a platform or deck, it will not support bodyweight and therefore it is important that installers use an independent support mechanism.

8. EXPOSURE CONTROLS/ Occupational Exposure LimitsPERSONAL PROTECTION Occupational Exposure Standard (OES)

Total TotalSubstance inhalable respirable

Gypsum 10 mg/m3 4 mg/m3

Limestone 10 mg/m3 4 mg/m3

Maximum Exposure Limit (MEL) (based on 8 hour TWA period)

Substance MELQuartz 0.3 mg/m3

Man Made Mineral Fibre 5 mg/m3

P L A S T E R B O A R D S – Health and Safety Data Sheet

Please note: Should any symptomspersist obtain medical assistance.



345

9

P L A S T E R B O A R D S – Health and Safety Data Sheet (continued)

8. EXPOSURE CONTROLS/ Personal protectionPERSONAL PROTECTION Respiratory:(continued) Area should have adequate ventilation and dust extraction, if not a half face mask to EN 149

Class FFP1S should be used.

Eye:Safety goggles to BS EN 166 2A5 are recommended when dust is likely to occur.

Skin:Wear overalls and suitable clothing to avoid repeated skin contact.

Hands:To limit the effect where protective gloves, a barrier cream can also be applied.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearancePaper faced flat sheet that are available in a range of thicknesses, widths and lengths, withedge profiles being either square or taper edged. Paper colour varies depending on board type.

Weights defined for reference Board Thickness WeightType mm kg/m2

Acoustic Homespan 15 12.5 – 12.9Baseboard 9.5 6.3 – 7.0Contour 6 5.4 – 6.0dBcheck 12.5 10.2 – 10.7dBcheck 15 12.5 – 13.1Echeck 12.5 10.0 – 10.5Firecheck 12.5 10.0 – 10.4Firecheck 15 12.0 – 12.8Firecheck Coreboard 25 21.3 – 21.7Fresco 15 12.0 – 12.8Hydrodeco 12.5 11.5 – 11.8Lath 9.5 6.3 – 7.0Lath 12.5 8.4 – 9.3Megadeco 12.5 10.7 – 11.3Megadeco 15 12.7 – 13.3Moisturecheck 12.5 8.0 – 8.7Moisturecheck 15 9.6 – 10.4M R Firecheck 12.5 10.0 – 10.4M R Firecheck 15 12.0 – 12.8Plank 19 13.6 – 14.0Predeco 9.5 6.0 – 7.0Predeco 12.5 8.0 – 8.7Predeco 15 9.8 – 11.0Standard 9.5 6.0 – 7.0Standard 12.5 8.0 – 8.7Standard 15 9.8 – 11.0Toughcheck 12.5 12.0 – 13.0Vapourcheck Baseboard 9.5 6.3 – 7.0Vapourcheck Wallboard 9.5 6.0 – 7.0Vapourcheck Wallboard 12.5 8.0 – 8.7Vapourcheck Wallboard 15 9.8 – 11.0

10. STABILITY AND REACTIVITY Stable and non reactive with other building materials.

11. TOXICOLOGICAL EFFECTS No known toxicological effects.

12. ECOLOGICAL INFORMATION Stable product with no known adverse effect.

13. DISPOSAL CONSIDERATIONS Authorised landfill site in accordance with current Waste Management Licensing Regulations.

14. TRANSPORT INFORMATION Not classified as hazardous for transport.

15. REGULATORY INFORMATION Products are not classified as hazardous under: Occupational Exposure Limits EH40Control of substances Hazardous to Health (COSHH) Regulations 2002.

16. OTHER INFORMATION This product is only intended for use as defined within current Lafarge Plasterboard Limitedliterature, please contact our Technical Enquiryline for further information.

This data sheet does not replace the users’ own work place risk assessment.

This safety data sheet:The user should be satisfied that the information data sheet is the current version, to confirm please telephone Lafarge Technical Enquiryline.

Based on our current best of knowledge and is intended to define our products with regards to the health and safety position.

It is not intended for the purpose of precise product specification or warranty.

346



P L A S T E R B O A R D L A M I N A T E S – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Thermalcheck WallboardLafarge Thermalcheck XP WallboardLafarge Thermalcheck K WallboardLafarge Thermalcheck Sheathing

SUPPLIER Lafarge Plasterboard Limited, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NFT 01275 377 773

2. COMPOSITION/ INFORMATION OF INGREDIENTS In general, plasterboard laminates comprise of calcium sulphate dihydrate encased in paper

liners with a thermal laminate bonded to the back. Natural plasterboard constituents mayinclude clay and minor amounts of quartz. There may also be small quantities of starch,foam, glass fibre and dispersants.

Expanded polystyrene containing residual amounts of expanding agent Pentane.

Extruded polystyrene containing colouring and flame retardant (1%w/w)Hexabromocyclodecane.

Rigid closed cell Phenolic resin foam with glass fibre and foil facings.

3. HAZARDS IDENTIFICATION These products are defined as non-hazardous under CHIP 2000.

Sawing and sanding may generate dust that may irritate the skin, eyes and respiratory system.

Non-restrictive clothing should be worn, especially avoiding constrictions at the neck and wrist.

It is recommended to wash work clothes separately from other clothing.

Pentane

CAS No. Content Hazard F

109-56-0 <1%wt Highly Flammable

4. FIRST AID MEASURES Inhalation:Clear respiratory tract and remove person to fresh air.

Skin contact: Using clean water rinse and then wash using soap & water.

If molten material has adhered to the skin, do not attempt to remove it. Rinse thoroughlywith cold water and obtain medical attention.

Eye contact:Wash with clean water and seek medical advice if irritation occurs.

Ingestion:Wash out mouth and drink plenty of clean water.

5. FIRE FIGHTING MEASURES Plasterboard has limited combustibility; however paper facings and packaging may burn.All standard fire extinguishers are suitable, using normal fire fighting procedures.

If exposed to a sustained source of ignition, the flame retardant plastics are combustible.The flammability hazard is increased when it is in dust form.



Plasterboard is supplied shrink wrapped on a bearer support system. Packs should be movedusing a folk lift truck or hydraulic trolley, care should be taken to ensure that the machineryis safely capable such movements and that the operator is trained and competent.

Plasterboard should be stored in dry flat conditions, if supported on bearers these should notexceed 450mm maximum centres.

Plasterboard is not a suitable product to be used as a platform or deck, it will not supportbody weight and therefore it is important that installers use an independent support mechanism.

Polystyrene laminates are combustible, the following fire precautions are recommended.

Smoking should be prohibited in storage area and when fixing.

Should be stored away from highly flammable material such as paint or petroleum products.




347

9

P L A S T E R B O A R D L A M I N AT E S – Health and Safety Data Sheet (continued)



Gypsum 10 mg/m3 4 mg/m3


Maximum Exposure Limit (MEL) (based on 8 hour TWA period)

Substance MEL

Quartz 0.3 mg/m3

Man Made Mineral Fibre 5 mg/m3

Man made fibres are non respirable.

Personal protectionRespiratory:Area should have adequate ventilation and dust extraction, if not a half face mask to EN 149Class FFP1S/ BS 6016 should be used.



Hands:To limit the effect wear protective gloves, a barrier cream can also be applied.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearancePaper faced flat sheet that are available in a range of thicknesses, widths and lengths, withedge profiles being either square or taper edged.

Paper colour varies depending on board type.






15. REGULATORY INFORMATION Products are not classified as hazardous under:

Occupational Exposure Limits EH40

Control of substances Hazardous to Health (COSHH) Regulations 2002

Chemicals (Hazard, Information and Packaging for Supply) (Amendment) Regulations 2000(CHIP 2000)



This safety data sheet:

The user should be satisfied that the information data sheet is the current version, to confirm please telephone Lafarge Technical Enquiryline.



Data used to compile this safety data sheet:

The Control of Substances Hazardous to Health Regulations 1999 (COSHH)

Health and Safety Executive Guidance Note EH40 Occupational Exposure Limits (current edition)

348



C O V E – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Cove 120Lafarge Predeco CoveLafarge Cove 90


2. COMPOSITION/ INFORMATION OF INGREDIENTS General composition:

Calcium sulphate dehydrate encased in paper liners. Natural constituents may include smallamounts of quartz. Minor amounts of starch, foam and dispersants may also be added.


Sawing and sanding of cove will generate gypsum dust, which may irritate skin, eyes andthe respiratory system.


Skin contact:Using clean water rinse and then wash using soap & water.

Eye contact:Wash with clean water and seek medical advice if irritation occurs.


5. FIRE FIGHTING MEASURES Products are fire resistant but packaging may burn.

All standard fire extinguishers are suitable, using normal fire fighting procedures.

6. ACCIDENTAL RELEASE MEASURES Not applicable.


Minimise dust when sawing in confined spaces.

Store in dry conditions and stack pallets no more than two high.



Plaster 10 mg/m3 4 mg/m3

Maximum Exposure Limit (MEL) (based on 8 hour TWA period)Substance MEL

Quartz 0.3 mg/m3

Personal protection Respiratory:

Area should have adequate ventilation and dust extraction, if not a half face mask to EN 149Class FFP1S should be used.

Eye:

Safety goggles to BS EN 166 2A5 are recommended when dust is likely to occur.

Skin:

Wear overalls and suitable clothing to avoid repeated skin contact.

9. PHYSICAL AND CHEMICAL PROPERTIES Reference should be made to product technical information publications.









349

9

C O V E – Health and Safety Data Sheet (continued)

15. REGULATORY INFORMATION Products are not classified as hazardous under:Chemicals (Hazard, Information and Packaging for Supply) (Amendment) Regulations 2000(CHIP 2000)






350



M E T A L S E C T I O N S – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Metal SectionsCormet Metal SectionsOmega Metal Sections


2. COMPOSITION/ INFORMATION OF INGREDIENTS Mild steel sections coated with zinc electrolytic process or hot dip galvanised process. The

sections may have a protective film of a roll forming hydrocarbon (oil/paraffin etc) lubricantor a residue or cutting fluid.

3. HAZARDS IDENTIFICATION These products are not classified as hazardous under CHIP 2000.

There is a risk of cuts and abrasions from sharp edges or protrusions when handling metalsections and also when they have been fitted to floors and walls but have not yet hadplasterboard fitted to them.

There is also a risk from tensioned bandaging.

Due to the residue of lubricant/rust inhibitors, frequent handling may cause skin problems.

Irritant fumes evolved during welding or cutting can cause metal fume fever.

4. FIRST AID MEASURES Inhalation of dust/ fumes:Remove person to fresh air.

Skin contact with dust/ surface agents: Rinse using clean water and then wash using soap & water.

Eye contact with dust/surface agents:Wash with clean water for 10 minutes and obtain medical advice if irritation persists.

Ingestion of dust/fumes:Wash out mouth and drink plenty of clean water. Do not induce vomiting.

5. FIRE FIGHTING MEASURES Although metal sections are non-flammable, the protective coating or lubricant may beflammable. This should be extinguished with carbon dioxide, dry powder, foam, sand earthor plaster.

6. ACCIDENTAL RELEASE MEASURES Control and collect any metal dust, sweep up and shovel into bags.

7. HANDLING AND STORAGE Eye protection should be worn when using hand tools.

Gloves should be worn when handling metal sections to avoid risk of lacerations.

Sections which are fixed to the floor /wall may have sharp edges exposed, so care shouldbe taken to protect people from accidental contact.

Sections supplied in bundles, small packs and strapped together in large packs for forklifttruck off-loading, should be stacked in a safe and stable manner. Bands or straps shouldnot be used for lifting. Coils/metal sections may spring apart when banding is released.

Consider risks as required by Manual Handling Operations Regulations 1992 if handlingmanually.

Fixers must work from an independent support system as metal sections are not designedto support body weight.



Iron Oxide 5 mg/m3 10 mg/m3

Zinc Oxide 5 mg/m3 10 mg/m3

Personal protection Respiratory:

If fume or dust is produced, ventilate the area of storage or work. When welding, flamecutting or grinding, wear approved respiratory equipment.

Eye:

When cutting tensioned banding, wear safety goggles to BS EN 166 2A5 to protect eyes.

Skin:

When handling sections, wear overalls and suitable clothing.




351

9

M E T A L S E C T I O N S – Health and Safety Data Sheet (continued)

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceMetal sections in various lengths, thickness and formations.

OdourParaffinic/oily (protective coating).

10. STABILITY AND REACTIVITY Stable under normal conditions.

When subjected to elevated temperatures, fumes are produced.

11. TOXICOLOGICAL EFFECTS Dry grinding and machining will produce dust, which is of the same composition as thecoating and base metal. The primary mode of entry into the body is by inhalation.

Excessive airborne concentrations over a long period of time may have a long-term effecton the worker, particularly affecting the lungs.

Fumes that are produced by elevated temperatures, such as welding or flame cutting, willcontain oxides of zinc and iron and also breakdown of any protective coating if present.Potential effects include metal fume fever, a condition similar to influenza.

Prolonged skin contact may cause irritation and may lead to dermatitis.

12. ECOLOGICAL INFORMATION No known harmful effects.



15. REGULATORY INFORMATION Products are not classified as hazardous under:Chemicals (Hazard, Information and Packaging for Supply) (Amendment) Regulations 2000(CHIP 2000)




Based on our current knowledge and is intended to define our products with regards to the health and safety position.


This safety sheet was created using current safety information supplied by distributors of the component materials.

352



P A P E R T A P E S – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Paper TapeLafarge Flex Tape



Rigid Polyvinyl Chloride, Cellulose, Lapenus Fibres, Fibre Glass.

3. HAZARDS IDENTIFICATION None identified.

4. FIRST AID MEASURES Not applicable.

5. FIRE FIGHTING MEASURES If forced to burn by another source, product releases traces of hydrogen chloride and otherirritating fumes. Fire fighters are recommended to use self-contained breathing apparatus.


7. HANDLING AND STORAGE When manually handling, consideration of the correct manual handling technique to limit risk,according to the Manual Handling Operations Regulations 1992.

No specific storage and handling guidelines.

8. EXPOSURE CONTROLS/ Cutting may require goggles and gloves.PERSONAL PROTECTION

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceWhite semi-rigid tape on roll.

Specific gravity: 1.3-1.5

Insoluble product.



12. ECOLOGICAL INFORMATION Not readily biodegradable.



15. REGULATORY INFORMATION No specific regulatory information.








353

9

R E S I L I E N T T A P E – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge RAFT 50 Resilient Tape


2. COMPOSITION/ INFORMATIONOF INGREDIENTS General composition:

Self-adhesive Open Cell natural rubber coils, with ASTM Spec of 1056 RO12-1A2 MediumDensity. Composed of black, natural rubber.

3. HAZARDS IDENTIFICATION Product does not have any significant hazards.

4. FIRST AID MEASURES Inhalation of fumes:Seek medical advice.

Skin contact:Not applicable.

Eye contact:Not applicable.

Ingestion:Seek medical advice.

5. FIRE FIGHTING MEASURES When burning releases dense acrid fumes and smoke which is hazardous to health. Firefighters should use self-contained breathing apparatus.

6. ACCIDENTAL RELEASE MEASURES Dispose as normal waste.


Store in original packaging in cool dry conditions.

8. EXPOSURE CONTROLS/ No special requirements.PERSONAL PROTECTION

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceBlack rubber open cell sponge.

Density: 414 kg/m3 +/-10%

Auto-ignition temperature and thermal decomposition both greater than 200ºC.


11. TOXICOLOGICAL EFFECTS No special requirements.


13. DISPOSAL CONSIDERATIONS Product as discarded in unaltered form is classified as a non-hazardous waste. Authorisedlandfill site in accordance with current Waste Management Licensing Regulations.


15. REGULATORY INFORMATION No specific Regulatory information applies.






354



P A T C H I N G T A P E – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Patching Tape



Resin Coated Fibre Glass Mesh with Pressure Sensitive Adhesive.

Contains Fibrous Glass Dust.

3. HAZARDS IDENTIFICATION Irritation may be caused to the upper respiratory tract, skin and eyes.

4. FIRST AID MEASURES Inhalation:Remove person to fresh air. There may be some irritation to the upper respiratory tract.

Skin contact: Using clean water, thoroughly rinse and then wash using soap and water. If skin troubleoccurs, seek medical advice.

Eye contact:Wash with clean water for 10 minutes and seek medical attention immediately.

Ingestion:Seek immediate medical attention. Do not induce vomiting.

5. FIRE FIGHTING MEASURES Flash point > 149ºC.On combustion of the organic resin finish, carbon dioxide, carbon monoxide, formaldehydesand other unidentified compounds may form.


7. HANDLING AND STORAGE When manually handling, consideration of the correct manual handling technique to limitrisk, according to the Manual Handling Operations Regulations 1992.

When handling this product, impervious gloves such as PVC should be worn.

Avoid contact with strong oxidisers.

8. EXPOSURE CONTROLS/ Ensure there is adequate ventilation provided. PERSONAL PROTECTION Protective overalls and impervious gloves should be worn.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceInsoluble, open mesh fabric.

Specific gravity: 1.2-1.3

Melting point: >91ºC

Softening point: >71ºC

10. STABILITY AND REACTIVITY Stable and non reactive under normal conditions.Avoid contact with solvents, oils and strong oxidisers.

11. TOXICOLOGICAL EFFECTS Avoid inhalation and ingestion.Product may cause slight irritation to the eyes and skin.

12. ECOLOGICAL INFORMATION Product does not contain volatile organic products.

13. DISPOSAL CONSIDERATIONS Disposal in accordance with local Regulations as waste is not hazardous.


15. REGULATORY INFORMATION Not applicable.









355

9

A C O U S T I C S E A L A N T – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Intumescent Acoustic Sealant



Water based emulsion, Acrylic polymer, flame retardant fillers, intumescent additives.

3. HAZARDS IDENTIFICATION Prolonged exposure may cause mild irritation to skin and eyes.

4. FIRST AID MEASURES Inhalation:Remove person to fresh air. Keep patient warm.

Skin contact: Wash thoroughly with soap and water. If skin trouble develops seek medical advice. Discardcontaminated clothing.

Eye contact:Wash with clean water for 15 minutes and seek medical attention immediately.

Ingestion:Seek immediate medical attention. Do not induce vomiting.

5. FIRE FIGHTING MEASURES Product is fire resistant but packaging materials may burn.

Suitable extinguishing media: Water spray, dry powder, foam and carbon dioxide.

6. ACCIDENTAL RELEASE MEASURES Contain spillage with sand or earth to prevent entry into drains.

Treat sand/mineral absorbent and dispose of in an approved site.

Use copious amounts of water to hose away any residue.

7. HANDLING AND STORAGE When handling the product, wear impervious gloves (e.g. PVC).

Store in dry conditions from 5º – 30ºC away from direct sunlight and clear of the ground.

Protect from freezing.

8. EXPOSURE CONTROLS/ Ensure there is adequate ventilation.PERSONAL PROTECTION Protective overalls, impervious gloves, a light dusk mask and goggles should be worn.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceOff white thixotropic paste.

pH: 8

Viscosity: 7000-10000 poise at 20ºC

Specific gravity: 1.3 at 20ºC

Solubility in water: Miscible with water.

Odour: Faintly aromatic.

10. STABILITY AND REACTIVITY Stable and non reactive with other building materials. Shelf life 12 months stored internally between 5ºC and 30ºC

11. TOXICOLOGICAL EFFECTS Avoid inhalation or ingestion. Irritation may occur if product comes into contact with skin or eyes.

Complies with Surface Flammability Criteria for bulkhead, wall ceiling linings and floor coveringsto International Maritime Organisation (IMO) Resolution A653 (16) As amended by ResolutionMSC 61 (67) and under the SOLUS 1974, IMO Resolution A687 (17) complies with approvedmaterials which will not ignite, or give rise to toxic or explosive hazards at elevated temperatures.

12. ECOLOGICAL INFORMATION Product not expected to cause harm to animals or plants.Do not allow to enter drains because of the danger of blockage.

13. DISPOSAL CONSIDERATIONS Disposal should be in accordance with local regulations. Waste products are not hazardous.

14. TRANSPORT INFORMATION Not classified as hazardous for transport. CHIP 2 not applicable.

15. REGULATORY INFORMATION Not applicable. Non-hazardous.







356



JO INT ING MATERIALS & ADHES IVES – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Bonding Compound Lafarge Cove Adhesive Lafarge Multi Purpose AdhesiveLafarge Supreme Skim Plaster Lafarge Fast Set Lafarge New Pure VelvetLafarge Predeco Joint Filler Lafarge Easy Finish Lafarge Universal Texture


2. COMPOSITION/ INFORMATION OF INGREDIENTS General Composition:

Calcium sulphate hemihydrate and limestone. May include minor amounts of quartz.

Jointing products may include small amounts of polymer binders and aggregates.

3. HAZARDS IDENTIFICATION These products are defined as non-hazardous under CHIP 2000.Dust/powder may irritate the skin, eyes and respiratory system.





5. FIRE FIGHTING MEASURES Products are fire resistant, though packaging may burn.All standard fire extinguishers are suitable, using normal fire fighting procedures.

6. ACCIDENTAL RELEASE MEASURES Prevent these products from contaminating drains, watercourses, ground or soil as apowder or slurry.

Mixed products should be absorbed on earth or sawdust.

7. HANDLING AND STORAGE When manually handling, consideration of the correct manual handling technique to limitrisk, according to the Manual Handling Operations Regulations 1992.

Wear protective clothing when handling products and avoid prolonged contact with skin.

Products are supplied in buckets and bags and strapped or packed together in large packsfor forklift truck off loading. Stack in a safe and stable manner.

Bags nominally weight 5, 10, 12.5, 15, 20 or 25 kgs

8. EXPOSURE CONTROLS/ Occupational Exposure Limits PERSONAL PROTECTION Occupational Exposure Standard (OES)




Mica 10 mg/m3 0.8 mg/m3


Quartz 0.3 mg/m3

Man Made Mineral Fibre 5 g/m3

Personal protection

Respiratory:Area should have adequate ventilation and dust extraction, if not a half face mask to EN 149Class FFP1S should be used.



Hands:To limit the effect wear protective gloves, a barrier cream can also be applied.




357

9

JOINTING MATERIALS & ADHESIVES – Health and Safety Data Sheet (continued)

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceDry Powder.

Odour: Odourless.

pH: Neutral.


11. TOXICOLOGICAL EFFECTS Inhalation of dust may cause short term irritation of the respiratory system.

Prolonged contact with skin may lead to dry skin.

No significant reaction will be noticed if small amounts of product are swallowed.







Chemicals (Hazard, Information and Packaging for Supply) (Amendment) Regulations2000 (CHIP 2000)






Data used to compile this safety data sheet:

The Control of Substances Hazardous to Health Regulations 1999 (COSHH)

Health and Safety Executive Guidance Note EH40 Occupational Exposure Limits (current edition)

358



J O I N T C E M E N T – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Readymix Lite Lafarge FineForm Mid-Weight Lafarge ReadymixLafarge New Pure Velvet Lafarge Rapid Sand Lafarge Deco MachineLafarge Deco Joint Cement


2. COMPOSITION/ INFORMATION OF INGREDIENTS Limestone and mica based, containing similar amounts of vinyl polymers and workability aids.

Ready mixed products are water based.

3. HAZARDS IDENTIFICATION Skin irritation or dryness may be caused by prolonged contact with dust or emulsion.Eyes and respiratory may be irritated by dust from sanding set joints or opening bags.


Skin contact:Wash skin thoroughly with soap and water. Obtain medical advice if irritation persists.

Eye contact:Wash with clean water for 15 minutes and obtain medical advice.

Ingestion:Wash out mouth and drink plenty of clean water. Do not induce vomiting.

5. FIRE FIGHTING MEASURES Products are not combustible but take care with packaging collection and disposal.

6. ACCIDENTAL RELEASE MEASURES Vacuum or brush dry spillages. Shovel as appropriate and bag for disposal taking care notto raise excessive dust.

Wet spillages should be contained and absorbed with sand or plaster then scraped andcleaned up.

Hot water and detergent can be used to clean adhesives and sealant residues.


Wear protective clothing when handling products and avoid prolonged contact with skin.

Products are supplied in buckets and bags and strapped or packed together in large packsfor forklift truck off loading. Stack in a safe and stable manner.

Nominally, buckets are 3 kgs or 20 kgs and bags are 22.5 kgs or 25 kgs.

8. EXPOSURE CONTROLS/ Occupational Exposure Limits (based on 8 hour TWA period)PERSONAL PROTECTION Occupational Exposure Standard (OES)



Personal protection

Respiratory:Area should have adequate ventilation and dust extraction, if not a half facemask to EN 149Class FFP1S should be used.


Skin:Wear overalls and suitable clothing to avoid prolonged skin contact.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceOdourless aqueous dispersions except Lafarge Rapid Sand and Lafarge New Pure Velvet, whichare powders, with neutral pH.

10. STABILITY AND REACTIVITY Stable and non reactive with other building materials, when stored correctly.

11. TOXICOLOGICAL EFFECTS Excessive dust produced by sanding or machining joints may irritate respiratory system.

Prolonged skin contact may cause irritation and lead to dermatitis.

Powder or splashes may cause irritation to eyes.

Swallowing a small amount of powder or wet mix will not cause any significant reaction orlong-term effect.




359

9

J O I N T C E M E N T – Health and Safety Data Sheet (continued)

12. ECOLOGICAL INFORMATION Aquatic toxicity is not determined but avoid contamination of any watercourses.


Completely empty packaging, which can then be recycled or processed.



CHIP 2 (The Chemicals (Hazard Information and Packaging) Regulations 1994)








360



D R Y W A L L A D H E S I V E – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Drywall Adhesive



Modified polymer emulsion/dispersion and other additives.

3. HAZARDS IDENTIFICATION This product is defined as non-hazardous under CHIP 2000.

Low hazard expected under normal conditions of use.

Avoid repeated skin contact.

Maintain good standards of industrial and personal hygiene.

Avoid ingestion, though toxicity is low.


Skin contact: After contact with skin. Wash immediately with plenty of soap and water. Do not use solventsto clean skin.

Seek medical attention is irritation persists.

Eye contact:In case of contact with eyes, rinse immediately with clean water and seek medical advice.

Ingestion:Seek immediate medical attention.

Do not induce vomiting because of the risk of aspiration into the lungs.

5. FIRE FIGHTING MEASURES In case of fire extinguish with water, foam, carbon dioxide of powder.

6. ACCIDENTAL RELEASE MEASURES Absorb spillage in earth or sand.

Dyke to prevent entry into sewer or waterway.

Flush spilt area with water.


Store out of reach of children in cool, dry conditions in temperature range of 5º – 30ºC.

Do not open containers in confined spaces.

8. EXPOSURE CONTROLS/ Exposure ControlPERSONAL PROTECTION Provide adequate local exhaust ventilation for when the product is being used.

Personal protection

Eye:If there is a risk of splashing, wear goggles.

Skin:Wear overalls and suitable clothing to avoid repeated skin contact if there is a risk ofcontamination.

Hands:To limit the skin contact, wear protective gloves.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceLiquid pink viscous miscible with water.

Perceptible odour.

Non –flammable.

pH: 7 –9.

10. STABILITY AND REACTIVITY Miscible with water.No hazardous reactions known if used for its intended purpose.

Decomposition products may include carbon oxides.

Sensitive to frost, store above 5ºC.

11. TOXICOLOGICAL EFFECTS No harmful effects have been encountered, (assuming appropriate usage).

12. ECOLOGICAL INFORMATION Not readily biodegradable.




361

9

D R Y W A L L A D H E S I V E – Health and Safety Data Sheet (continued)

13. DISPOSAL CONSIDERATIONS May be taken to an authorised dump, or incinerated/introduced to a biological treatmentplant, in accordance with local byelaws.





EEC Hazard Classification

Product only contains substances on the European Inventory of Existing ChemicalSubstances (EINECS)

Non-hazardous according to current CHIP Regulations

16. OTHER INFORMATION This product is only intended for use as defined within current Lafarge Plasterboard Limitedliterature, please contact our Technical Enquiryline for further information.This data sheet does not replace the users’ own work place risk assessment.




362



W A L L B O A R D S E A L E R – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Drywall SealerLafarge Universal Sealer



Product contains a blend of Limestone and Silica fillers dispersed in a blend of Chlorine, whichcontains polymers.

Contains less than 0.05% vinyl acetate and 0.0001% vinyl chlorite.


Avoid skin contact as repeated contact with surfactants and residual monomer may causedermatitis.

Maintain good standards of industrial and personal hygiene.

Eye irritation may be caused by emulsion.

Provide suitable local exhaust ventilation where emulsion is being heated, dried or sprayed.In poorly ventilated areas, the monomer vapours may be irritating to the respiratory tract,the mucous membranes and the eyes. Symptoms of headache and nausea may be produced.

Avoid ingestion, though toxicity is low.


Skin contact:Use water to wash before the emulsion dries, remove clothing if it is badly contaminated.

This will avoid discomfort that may be produced by adhering resin.

Eye contact:Wash with clean water and seek medical advice.

Ingestion:Wash out mouth and drink plenty of clean water. Reassure patient that there is no serioushazard as toxicity is low.

5. FIRE FIGHTING MEASURES Though emulsions will not burn, dried resin films are capable of burning.


If emulsion is spilt, use an inert absorbent to soak it up and place in a suitable container fordisposal.


Store out of reach of children in cool, dry conditions in the temperature range of 5º – 30ºC.


8. EXPOSURE CONTROLS/ Exposure ControlPERSONAL PROTECTION Provide adequate local exhaust ventilation for when the product is being heated, sprayed

or dried.

Personal protection

Respiratory:When spraying, wear masks.


Skin:Wear overalls and suitable clothing to avoid repeated skin contact if there is a risk of splashing.

Hands:To limit the skin contact, wear protective gloves.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceLow viscosity liquid.

pH: Approx. 7

Solids content 55+/- 1%

10. STABILITY AND REACTIVITY Do not freeze.




363

9

W A L L B O A R D S E A L E R – Health and Safety Data Sheet (continued)


12. ECOLOGICAL INFORMATION Do not allow dispersion to enter waterways in an unpurified state.

Chemical flocculation can eliminate residue from effluent.

13. DISPOSAL CONSIDERATIONS Dispersion may be taken to an authorised dump after chemical flocculation, or incinerated/introduced to a biological treatment plant, in accordance with local byelaws.





EEC Hazard Classification

Product only contains substances on the European Inventory of Existing ChemicalSubstances (EINECS)





364



T E X T U R E S E A L E R – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Sealertex


2. COMPOSITION/ INFORMATION General composition:OF INGREDIENTS Aqueous, modified adhesive based on polyvinyl acetate.

Dangerous componentsCalcium Carbonate <12.5%

Alkanes C10-13, chloro Xn, N; R 40 – 50/53 <2.5%

3. HAZARDS IDENTIFICATION Hazard designationXn Harmful.

Information pertaining to particular dangers for man and environmentThe product has to be labelled due to the calculation procedure of the “General Classificationguidelines for preparations of the EU” in the latest valid version.

R40: Limited evidence of carcinogenic effect.

R52/53: Harmful to aquatic organisms, may cause long term adverse effects in the aquaticenvironment.

Classification systemThe classification is in line with current EC lists. It is expanded however, by information fromtechnical literature and by information furnished by supplier companies.


Skin contact:Use water to wash before the product dries The product is not skin irritating.

Eye contact:Wash with clean water for several minutes.


5. FIRE FIGHTING MEASURES Suitable extinguishing agents:CO2, extinguishing powder, water jet or alcohol resistant foam.


If product is spilt, use an inert absorbent to soak it up and place in a suitable container fordisposal.


Store out of reach of children in cool, dry conditions in the temperature range of 5º - 30ºC.


8. EXPOSURE CONTROLS/ Exposure Control PERSONAL PROTECTION Provide adequate local exhaust ventilation for when the product is being sprayed or drying.

Occupational Exposure Standard (OES) (based on 8 hour TWA period)


Calcium Carbonate 10 mg/m3 4 mg/m3

Personal protection

Respiratory:When spraying, wear masks.


Skin:Wear overalls and suitable clothing to avoid repeated skin contact if there is a risk of splashing.

Hands:To limit the skin contact, wear suitable protective gloves.

Body Protection:Wear protective work clothing.




365

9

T E X T U R E S E A L E R – Health and Safety Data Sheet (continued)

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceOff White liquid.

Viscosity: 20000 mPas

pH value at 20ºC: 8.0

Solids content 43.3%

10. STABILITY AND REACTIVITY Do not freeze.


12. ECOLOGICAL INFORMATION Ecotoxical effects:Remark: Harmful to fish.

General Notes: Water hazard class 2 (Self assessment): hazardous for water.

Do not allow product to reach ground water, water bodies or sewerage system.

Danger to drinking water, if even small quantities leak into soil.

Harmful to aquatic organisms.

13. DISPOSAL CONSIDERATIONS Recommendation:Hand over to disposers of hazardous waste.

European waste catalogue:

08 04 10 waste adhesives and sealants other than those mentioned in 08 04 09

Disposal must be made in accordance with legal requirements.

14. TRANSPORT INFORMATION Not classified as hazardous for land transport.

15. REGULATORY INFORMATION Designation according to EC guidelines The product has been classified and labelled in accordance with EC Directives Chemicals,(Hazard Information for Packaging and Supply) (CHIP) Regulations.

Code letter and hazard designation of product:Xn Harmful

Hazard determining components of labelling:Alkanes C10-13, chloro

Risk Phases:Limited evidence of carcinogenic effect.

52/53: Harmful to aquatic organisms, may cause long-term adverse effects in the aquaticenvironment.

Safety phases36/37: Wear suitable protective clothing and gloves.

61: Avoid release into the environment. Refer to special instructions/ safety data sheets.





366



B U I L D I N G P O W D E R S – Health and Safety Data Sheet

1. IDENTIFICATION OF THE SUBSTANCE OR PREPARATION AND COMPANYLafarge Stucco


2. COMPOSITION/ INFORMATION General CompositionOF INGREDIENTS Calcium sulphate hemihydrate.

May include minor amounts of quartz.


Plaster powders may cause irritation to the skin, eyes and respiratory system.

An alkaline solution may be produced on contact with body moistures or when mixedwith water.




Ingestion:Wash out month and drink plenty of clean water.

5. FIRE FIGHTING MEASURES Fire resistant products, but packaging may burn.

All standard fire extinguishers are suitable, using normal fire fighting procedures.

6. ACCIDENTAL RELEASE MEASURES Collect released dust and put into bags.

Prevent these products from contaminating drains, watercourses, ground or soil as powderor slurry.


Pallets should be stored in dry conditions should be not be stacked more than two high.

8. EXPOSURE CONTROLS/ Occupational Exposure Limits PERSONAL PROTECTION Occupational Exposure Standard (OES)




Quartz 0.3 mg/m3

Personal protection

Respiratory:Area should have adequate ventilation and dust extraction, if not a half face mask to EN 149Class FFP1S should be used.



Hands:To limit the effect where protective gloves, a barrier cream can also be applied.

9. PHYSICAL AND CHEMICAL PROPERTIES AppearanceDry odourless Powder.

pH Neutral to alkaline as wet plaster (pH 7-13 depending on grade).


11. TOXICOLOGICAL EFFECTS Inhalation of plaster dust may irritate respiratory system.Prolonged contact with plaster may lead to dry skin and irritation.

If product comes into contact with the eye, it must be washed out immediately to reducediscomfort and possible long term effects.




367

9

B U I L D I N G P O W D E R S – Health and Safety Data Sheet (continued)

12. ECOLOGICAL INFORMATION MobilitySoluble in water, forms a solution and solidifies.






Chemicals (Hazard, Information and Packaging for Supply) (Amendment) Regulations 2000(CHIP 2000)






368

H E A L T H A N D S A F E T YSPECIFICATION CLAUSES


Expansion/movement jointsShall be provided at maximum 10 metre centres and also over movement control joints inbackground where necessary. (For detail, see appropriate sections of this manual.)

Health and SafetyAll recommendations contained in the Lafarge Plasterboard Health and Safety Data Sheet shallbe followed. (See Lafarge COSHH Data Sheets; also HSE’s CONDAM data, to includedisposal of waste product.)

Storage of materialsThe recommendations of BS 8212: 1995, Section 5, paragraph 31 must be complied with, andall materials used must be within their “Use by” date.

Site conditions and workmanshipTemperature to be no less than 5ºC. Site conditions to be in accordance with BS 8212: 1995,Section 5, paragraphs 28-35.

Workmanship in accordance with BS 8212: 1995, Sections 3 and 6 and BS 8000: Part 8.

All materials, unless otherwise indicated, shall be supplied by Lafarge Plasterboard and beinstalled in accordance with the current literature.


General clauses to be added to systemspecification if required


H E A L T H A N D S A F E T YENVIRONMENTAL POLICY

369

9

Environment Policy

Fulfilling our Responsibility to theEnvironment and the Community isa key objective of our business

We will prevent pollution, complying withall relevant environmental legislation. Wherefeasible, we will integrate Environmentalconsiderations into our business processes,improving sustainability and productstewardship.

All employees are responsible for respectingthis policy and education and training tothis end will be provided. The company willadopt an Environmental ManagementSystem (EMS) complying with BS EN ISO14001: 2004 to ensure its environmentalobjectives are met. We will continuouslyimprove our environmental performance.

• Maximising the efficient use of energy inour business;

• Minimising the use of non-renewableresources and, when feasible and safe,replacing them with secondary rawmaterials or alternative fuels;

• Minimising waste, re-using and recyclingmaterials where possible, disposing ofwaste responsibly;

• Conserving water and minimising the riskof accidental release to air water and land;

• Respecting the natural environmentsurrounding our sites; limiting noise andprogressively improving their visual aspect;

• Minimising the environmental risks to ouremployees and surrounding communities;

• Encouraging our suppliers to adhere tosimilar environmental principles throughprocurement processes;

• Adhering to environmental commitmentsdefined by Lafarge Group and the LafargeGypsum Division.

Specific targets will be developed to drivemany of these objectives. Good stakeholderrelations will be promoted through activeengagement and communication.LafargePlasterboard employees play a key role inthe implementation and success of thispolicy and targeted communication willencourage and support their activeparticipation.

Bruce SlattonManaging director

370

H E A L T H A N D S A F E T YSUSTAINABILITY


Recycling Gypsum Waste

The gypsum industry is committed tosustainability.

Gypsum products could be counted amongthe very few construction materials where“closed loop” recycling is possible, i.e.where the waste is used to make the sameproduct again and not merely recovered foruse in other “downcycling” applications asis the case with some other constructionmaterials, e.g. waste concrete and bricksused for aggregates in road construction.

The objective to recycle gypsum is not asstraightforward as the decision facing otherconstruction products. There are technicalobstacles that limit the proportion of wasteto raw gypsum that can be used in themanufacturing process. There is also anenvironmental penalty to pay as recyclinggypsum waste is more energy intensive thanusing raw gypsum, because of the need tocollect and transport the material, sort andpurify it and remove the moisture content,which is the most energy intensive part ofthe manufacturing process. Hand-in-handwith these considerations are the economicconsequences. Gypsum is a natural materialthat is used in construction due to itsthermal, acoustic and fire resistance, if itbecomes too expensive builders will beforced to use less environmentally friendlyalternatives.

Recycling of manufacturingscrap

While small quantities of raw gypsum scrapare left from the manufacturing process andcan be re-used without treatment, themajority of scrap is plasterboard off-cuts.This material includes paper which must beremoved before re-use. Because of this, theuse of such gypsum requires greater energythan using raw gypsum.

Recycling of construction &demolition (C&D) gypsum waste

Some construction waste is recovered andre-used, but this is energy intensive tocollect and treat. The gypsum industryworldwide is investigating the re-use ofconstruction gypsum waste as an objective.At present the economics of this activity aremarginal. However, it is expected to becomemore common as landfill restrictions make itcomparatively more attractive.

Demolition waste is a bigger problem withadditional contamination to remove (paper,paint, screws, wood, etc.). Over the next20-30 years the economics for demolitionwaste is expected to change as thequantities begin to increase substantially,due to the strong increase in the use ofplasterboard in construction which began inEurope in the 1960s and 1970s. Renovationand demolition work will see increasingvolumes of gypsum waste. The increasing

use of dismantling or deconstructiontechniques will increasingly make possibledemolition collection and recycling.

Successful and economic site waste recoveryis a partnership. Site managers need tomanage and segregate waste sufficientlywell to make it viable. Construction workersneed to be educated to think sustainably.Clients need to design the necessary cultureinto their construction projects at an earlystage. There is guidance available. For theUK see the DTI Site Waste Managementand Plans - Guidance for ConstructionContractors and Clients. It can bedownloaded at:http://www.dti.gov.uk/construction/sustain/site_waste_management.pdf

Other opportunities for gypsumwaste

Pure gypsum has traditionally been used asoil improver. The use of gypsum waste as asoil conditioner is strictly regulated and thequantities that can be used are limited.

Gypsum Waste Disposal (Englandand Wales)

The following is a statement from theGypsum Products Development Association

UK Regulations Governing WasteDisposal

The Waste (Duty of care) Regulationsimpose a legal duty of care upon anyonewho produces or imports, keeps or stores,transports, treats, recycles or disposes ofwaste. As of 16th July 2004, changesarising to the Landfill (E&W) (amendment)Regulations 2004 (SI2004:1375) havebanned the disposal of non-hazardous andhazardous waste materials together in thesame landfill and given further guidance onthe disposal of certain non-hazardouswaste.

Is gypsum waste hazardous?

No. It should be stated very clearly thatgypsum wastes, including plaster,plasterboard and gypsum products, areclassified as non-hazardous.

Environment Agency RegulatoryNote 11

RGN 11 gives guidance on best practice forthe disposal of wastes with high sulphate orgypsum contents. RGN 15 advising disposalin separate non-hazardous cells where nobiodegradable waste is present at landfillsite, because of the risk of release ofhydrogen sulphide gas, came into force inJuly 2005.

It is unfortunate that the EnvironmentAgency also includes in RGN 15 advice noteother products to be disposed in separatecells, namely ‘stable non-reactive hazardous

wastes’ and ‘asbestos wastes’. But it shouldbe made clear again that gypsum is notclassified with those wastes and is non-hazardous.

Further guidance

Gypsum wastes can continue to bedisposed of with current guidance and atsites with the appropriate wastemanagement license

Further guidance and advice is availablefrom the Environment Agencywww.environment-agency.gov.uk

General enquiry line 0845 9333111

Contact you Waste Managementorganisation or local Authority for advice.

Lafarge Wasteline service is available on:

T. 01275 377 579F. 01275 377 550E. [email protected]

or call Lafarge Literatureline for a copy ofthe Waste management brochure.

Sustainability

REFERENCES 10

372

R E F E R E N C E SBIBLIOGRAPHY


Bibliography

Main British Standards

BS 1230 Gypsum plasterboard

Part 1: 1985 Specification for plasterboard excluding materials submitted to secondary operations

BS 8000 Workmanship on buildingsites

Part 8: 1989 Code of practice for plasterboard partitions and drylinings

BS 8212: 1995 Code of practice fordrylining and partitioning usinggypsum plasterboard

Other British Standards

BS 476 Fire tests on buildingmaterials and structures

Part 4: 1970 (1984) Non-combustibility test for materials

Part 6: 1981 Method of test for fire propagation for products

Part 7: 1987 Method for classification of the surface spreadof flame of products

Part 20: 1987 Methods for determination of the fire resistance of elements of construction (general principles)

Part 21: 1987 Methods for determination of the fire resistance of loadbearing elements of construction

Part 22: 1987 Methods for determination of the fire resistance of non-loadbearing elements of construction

Part 23: 1987 Methods for the determination of the contribution of components to the fire resistance of a structure

BS EN 1363 Fire resistance tests

Part 1 General requirements

BS EN 1364 Fire resistance tests fornon-loadbearing elements

Part 1 Walls

Part 2 Ceilings

BS EN 1365 Fire resistance tests forloadbearing elements

Part 1 Walls

Part 2 Floors and roofs

Part 3 Beams

Part 4 Columns

BS EN 1366 Fire resistance of serviceinstallations

Part 3 Penetration seals

Part 4 Linear joint seals

BS EN 13381 Contributor of fireresistance of structural members

Part 3 Membrane protection - horizontal

Part 4 Steel elements

BS 1191 Specification for gypsumbuilding plasters

Part 1: 1973 Excluding premixed lightweight plasters

Part 2: 1973 Premixed lightweight plasters

BS 1449: 1991 Specification for coldrolled narrow strip based uponspecified minimum strength

BS 2750: 1980 Methods ofmeasurement of sound insulation inbuildings and of building elements

BS 2994: 1987 Specification for coldrolled steel sections

BS 4275: 1974 Recommendations forthe selection, use and maintenanceof respiratory protective equipment

BS 4016: 1972 Specification forbuilding papers (breather type)

BS 4940: 1994 Technical Informationon construction products andservices

BS 4978: 1988 Specification forsoftwood grades structural use

Part 2: 1992 Partitions (including matching linings)

BS 5234: Specification forperformance requirements forstrength and robustness

Part 2: 1992 Including methods of test

BS 5268 Structural use of timber

Part 2: 1991 Code of practice for permissible stress design, materialsand workmanship

BS 5270 Bonding agents for use withgypsum plasters and cements

Part 1: 1989 Polyvinyl acetate (pvac) emulsion bonding agents for internal use with gypsum building plasters

BS 5492: 1990 Code of practice forinternal plastering

BS 5821 Rating the sound insulationin buildings and of buildingelements

Part 1: 1984 Method of rating the airborne sound insulation in buildings and of interior building elements

Part 2: 1984 Method of rating the impact sound insulation

BS 6452 Beads for internal plasteringand drylining

Part 1: 1984 Specification for galvanised steel beads

BS 7374: 1990 Methods of test forwater vapour transmission resistanceof board materials used in buildings

BS 7364 Specification for galvanisedsteel for stud and sheet partitionsand linings using screw fixedgypsum wallboards

BS EN 140: 1995 et seq. Methods ofmeasurement of sound insulation inbuildings and of building elements

BS EN 10142: 1991 Zinc coating onsheet and strip for forming

BS EN 10143: 1993 Hot dip zincgalvanised plate and sheet –tolerances on dimensions and shape

Regulations

National Building Regulations 1991,as amended 1992, 1995 and 2000.

Building Standards (Scotland)regulations

Health Technical Memoranda

HTM56 Partitions

HTM60 Ceilings

HTM81 Firecode: Fire precautions innew hospitals


R E F E R E N C E SGLOSSARY OF TERMS

373

10

Absorption

Conversion of sound energy into heat,often by the use of a porous material.

Absorbent material

Material that absorbs sound energy.

Airborne sound

Sound transmitting through the air,often linked to noise sources such asspeech and television.

Airborne sound insulation

Sound insulation that reduces thetransmission of airborne soundbetween adjoining dwellings orparts of adjoining dwellings.

Cavity stop

A proprietary product or materialsuch as mineral wool (fibre) used toclose the gap in a cavity wall.

Composite resilient batten

A timber batten that is composed ofa timber batten with a pre-bondedresilient material to provideisolation between the flooringsurface layers and floor base.

Ctr

Spectrum adaptation term (No.2)from BS EN ISO 717-1: 1997 to takeaccount of a specific sound spectra(that are predominantly lowfrequency based representing ‘A’weighted urban noise.

Decibel (dB)

The unit used for different acousticquantities to indicate the level withrespect to a reference level.

Density (kg/m3)

Mass per unit volume, expressed inkilograms per cubic metre (kg/m3).

Direct transmission

Sound that is transmitted onlythrough the main separatingelement and involves no otherflanking element.

DnT

Standardised level difference. Thedifference in sound level between apair of rooms (source and receivingrooms), for a stated frequency, thatis corrected (normalised) for thereverberation time (in the receivingroom). See BS EN ISO 140-4: 1998.

DnT,w

Weighted standardised leveldifference. A single-number quantity(weighted) that characterises theairborne sound insulation betweentwo rooms. See BS EN ISO 717-1:1997. Based on field/site testincluding flanking transmission.

Glossary of terms

DnT,w + Ctr

Weighted standardised leveldifference that characterises theairborne sound insulation betweentwo rooms using spectrum adaptationterm (No.2) from BS EN ISO 717-1:1997 which represents ‘A’ weightedurban noise.

Flanking element (e.g. flankingwall)

Any building element that contributesto the airborne sound or impactsound transmission between roomsin a building which is not the directseparating element (i.e. not theseparating wall or separating floor)

Flanking transmission

Airborne sound or impacttransmission between rooms that istransmitted via flanking elementsand/or flanking elements inconjunction with the mainseparating elements.

Flexible closer

A flexible cavity stop or cavitybarrier that seals the air path incavities linking adjoining dwellings.

Floating floor treatment

A timber floating floor system whichmay use battens, cradles or platformbase; all of which use a resilient layerto provide isolation from the basefloor and adjacent wall elements.

Flooring board

The boards that form the top surfaceof the floor. Boards should be wood-based panels 600mm (min) wide.

Habitable room

For the purposes of Part E RobustDetails, habitable rooms are all roomsexcept the hall, staircase and landing.

Internal wall

A wall or partition that divides thedwelling space into differentfunctions but which does notprovide separation betweendifferent dwellings.

Internal floor

A floor that divides the dwellingspace into different functions butdoes not provide separationbetween different dwellings.

LnT

Standardised impact sound pressurelevel. The impact sound pressurelevel in the receiving room at astated frequency, corrected(normalised) for the reverberationtime in the receiving room. See BS EN ISO 140-7: 1998.

LnT,w

As LnT above but weightedstandardised impact sound pressurelevel. A single-number quantity(weighted) to characterise theimpact sound insulation of floors.See BS EN ISO 140-7: 1998.

Mass per unit area (or surfacedensity)

Mass per unit area is expressed inkilograms per square metre (kg/m2).

Mineral wool

A rock or glass based mineralmaterial that can be manufacturedin a quilt form or batt (more rigid)form.

Nominal density of gypsum-based board

The density stated in the robustdetail with a tolerance of up to -0.3 kg/m2 per layer.

Rw

A single-number quantity(weighted) that characterises theairborne sound insulation of abuilding element frommeasurements undertaken in alaboratory. See BS EN ISO 717-1:1997. Based on laboratory testexcluding any flanking elements.

Rw + Ctr

Weighted airborne sound insulationof a building using spectrumadaptation term (No. 2) from BS ENISO 717-1: 1997, representing ‘A’weighted urban noise.

Robust Detail

A robust detail for Part E of theBuilding Regulations has been giventhe status of RD following aminimum of 30 “field tests” wherethe recorded mean performance was5 dB better then the soundinsulation requirements as describedin Approved Document E for newbuild separating walls and floors.

Lafarge sealant (acoustic orflexible)

A gun-applied sealant that hasresilience and forms a non-rigidcaulking. Performs acoustically andfor fire protection.

Separating floor

A floor that separates adjoiningdwellings.

Separating wall

A wall that separates adjoiningdwellings.

The definitions given above are forthe purposes of this manual onlyand are not intended to be rigorous.

374

R E F E R E N C E SINDEX


Entries in italic type refer to therelevant performance table pagenumbers

Acoustic Floor Clips 208, 334

Acoustic Floor system, Cormet 177, 207

Acoustic Homespan 90, 113

Acoustic insulationSee appropriate section

Acoustic Sealant 335

Acoustic theory 14

Adhesive, Lafarge Cove 326

Adhesive, Lafarge Drywall 326

Adhesive, Lafarge BondingCompound 325

Direct Bond wall linings 23, 29 Thermalcheck linings 23, 33

Adhesive, Lafarge Multi Purpose 326Direct Bond wall linings 23, 29Thermalcheck linings 23, 33

Baffle details 146-147

Baseboard 316

BeadsEdging 336Stop 336Tape-On 336

Beam and column encasement 224-226, 237

Bibliography 372

Board fixing 322

Boxing studs 152

British Standards 372

Building Regulations 372

Bullnose Profile 269, 277

C Studs 125, 329

CB Clips 239, 334

CeilingsCormet Dryliner 171-172, 187 corridors, fire protection 222mass barrier 176, 203panelled Fresco 250, 258 retained (conversion works) 177, 208 separating floors (high

performance) 168-169, 177-178suspended, Cormet MF 173-175, 197to garages 167to roof trusses 170, 180 to timber floors 163-169, 179

Ceramic tiling 159

CH Studs 229, 331

Channels Ceiling 198, 333Dryliner 42, 188, 332Edge 239, 333Fixing 116,128, 142, 144, 147, 335Primary 198, 333

Cleat, soffit 198, 333

ClipsAcoustic Floor 208, 334CB 239, 334Staggered Stud 100-101, 335

Concrete floors 172, 178, 193, 215

Connector, Dryliner Channel 332

Contourlinings 63wallboard 318walls 281

Control jointsmetal ceilings 201metal stud partitions 153Shaftwall 235wall lining, Direct Bond 31

Coreboard, Firecheck 219-223, 315

CormetAcoustic Homespan 90, 113 Column and Beam Clip system

224-226, 237Dryliner ceilings 171-172, 187Dryliner wall linings 25-26, 41 encasements 224-226, 237 Independent Wall Linings 27, 47 partitions 71-92, 99-132Metal Furring 38MF Suspended ceilings 173-175, 197Resilient Bar 79-93, 107, 334Shaftwall 219-223, 227twin frame 73, 77-80, 86, 89, 99

Corner Profiles 269, 339

Corner protection 269, 339

Corner Step Profiles 270, 338

Corners, curved 269, 339

Corridors, ceilings, fire protection 222

Cove 261

Cove Adhesive 262, 326

CR Bracket (Dryliner) 332

Curved walls 154

Cutting plasterboard, health &safety 344

Damage repair 323

dBcheck wallboard 75-79, 314

Deco jointing compounds 288, 326

Deco System 287

Deflection Head Bracket 143

Deflection head, metal stud 103, 117, 129, 142-143, 335

Direct Bond wall linings 29

Door frame details 151

Drylinerceilings 171-172, 187wall linings 25-26, 41

Drywall Sealer 325

Ductsfire protection (Shaftwall) 222, 233passing through partitions 148-150penetrations 233

E Studs 331

Easy Finish jointing compound 292, 324

Echeck wallboard 84-86, 314

Edge Bead 296, 336

Edge Channel 239

Edge Trim, Shadowline 270, 339

Electrical services, provisions forCormet metal stud partitions 146-147

Encasements, Cormet 224-226, 237

Fast Set, jointing compound 292, 324

Fillers, joint 288

FineForm Mid-Weight 292, 325

Finish plaster, Lafarge Supreme 301

Finishesceramic tiling 159Drywall 286Texture 305

Finishes, joint 288, 292

Fire performance See also application tables

Fire protection systems 217column and beam 224-226, 237Shaftwall 219-223, 227

Fire theory 11

Firecheck Coreboard 219-223, 315see also applications

Firecheck wallboard 80-83, 315see also applications

Fixing Channel 335

Fixing into plasterboards 156-157

Fixing plasterboards 158-159

Flat Strap 102,110,142-143, 335

Flex Tape 336

Flex Track 155, 336

Flex Trim, Shadowline 270, 339

FloorsConcrete 172, 178, 193, 215Cormet Acoustic Floor 177, 207Cormet Dryliner 171-172, 187Downlighters in floors 203Robust Details 178, 215 separating (high performance)

168-169, 177-178timber floors 163-171, 173, 174, 179

Fresco 249-250, 251

Index



375

10

Grand Fresco Panels 254

Gypsum plasterboards, seeplasterboards

Hanging Reveal Profile 270, 338

Health and safety 341

Homespan 90, 113, 317See also Acoustic Homespan

Horizontal Shaftwall assemblies 222

Hp/A tables of structural steel 224

Hydrodeco wallboard 313

I Studs 49, 101, 330

Independent Wall lining, Cormet 27, 47

Insulation, acoustic 14see also application section

Insulation Hold Strip 102, 108, 335

Installation tips 158

Intumescent sealant 335

J Tracks 229, 331

Jointing compounds 288, 292

Joint Tape 292

Jointing, Lafarge Taping andJointing system 291

Joist Connector, Dryliner 188, 332

Laminates, thermalThermalcheck boards 319Thermalcheck linings 23-25, 27, 33

Lath (round edge baseboard), 317

Lift shaft enclosure, Shaftwall 219-223, 227

LiningsContour 63Direct Bond 23, 29Dryliner 25-26, 41Independent 27, 47Metal Furring 38Thermalcheck 23-25, 27, 33to timber frame 28, 55

Loft spaces, ceilings to 170, 180-183

Machine applied joints 289, 296

Mainwall Panel, Fresco 249-250, 253

Masonry walls 96, 139linings to 23, 27, 29, 38, 47

Megadeco wallboard 71-73, 313

Metal Angle 333

Metal Furring Channel 38

Metal Furring wall lining 38

Metal stud partitions 71-92, 99-132

Moisturecheck wallboard 318

Moisture Resistant Firecheck 315

Movement control joints 335ceilings 201metal stud partitions 153Shaftwall 235wall linings, Direct Bond 31

Multi Purpose Adhesive 326Direct Bond linings 23, 30Thermalcheck linings 23-25, 27, 33

Nails, Drywall 322

Occupational exposure standards 343

Omega studs 91-92, 115

PartitionsAcoustic Homespan 90, 114Acoustic Stud 113-121Cormet curved metal stud 154Cormet metal stud 71-92, 99-132dBcheck 75-79Echeck 85-86Firecheck 80-83Megadeco 71-73Omega 91-92Predeco 87-89Resilient Bar 107-112staggered stud 79, 100Standard wallboard 87-89structural steel 97timber stud 93-95, 133twin frame 73, 77-80, 86, 89, 99Toughcheck 74

Party wall timber frame 95, 134-137

Party wall metal stud,see Cormet twin frame

Patching Tape 336

Phonissimo 176, 198

Phonistar 176, 198

Plasterboard, typesAcoustic Homespan 317Baseboard 316Contour wallboard 318dBcheck wallboard 314Echeck wallboard 314Firecheck Coreboard 315Firecheck wallboard 315Firecheck, Moisture Resistant 315Fresco 318Hydrodeco 313Lath (round edge baseboard) 317Megadeco 313Moisturecheck wallboard 318Plank (19mm wallboard) 316Predeco 313Standard wallboard 316Thermalcheck boards 319Toughcheck wallboard 314Vapourcheck wallboard 317

Plasters, Supreme Skim plaster 301, 326

Predeco wallboard 287, 313

Profiles 267-279, 338, 339

Primary Channel 198

Pure Velvet, jointing compound 292, 324

Quad Shadowline Corner StepProfile 271, 275, 338

Rapid Sand 292, 324

Ready reckoner coverage 308

Readymix jointing compound 292, 325

References 371-377

Repairs to plasterboard 323

Resilient Bar 57, 61, 107-112, 135, 334in floors 164-168, 176, 178, 184,

209-211, 215

Resilient Tape 101, 208, 334

Reveal, Profile 270

Robust Details - floors 178, 215

Robust Details - partitions 95-97

Rubber grommet 128, 336

Sales offices 377

Sanding paper 292

Screws 327-328

Sealant, Acoustic 335

Sealer, Drywall 291, 325

Sealer, Universal 306, 325

Sealertex 306, 325

Separating floors (highperformance)

Cormet Acoustic Floor system 177, 207

separating floors 168-169, 177-178, 215

Separating wallsCormet twin frame 73, 77-80, 86,

89, 99structural steel 97timber frame (high performance)

95

Service outlets 146-147

Servicesducts, fire protection (Shaftwall)

222, 233provision for, metal stud

partitions 146-150

Services, sales and technical 377

Shadowline Profiles 270-271, 338

Shaftwall 219-223, 227

Skim plaster 301

Skirting Profile 271, 338

Soffit Cleat 198, 333

Softform Profile 269, 339

Index

376 TECHNICAL ENQUIRYLINE t 01275 377789 f 01275 377456 www.lafargeplasterboard.co.uk


Sound insulationSee application sections

Specification clausesSee application sections

Specialist junctions 141-159

SR Bracket (Dryliner) 42, 332

Staggered Stud Clip 101, 335

Stairwells, fire protection (Shaftwall)223

Stairwall Panels, Fresco 253, 257

Standard Reach (Dryliner) 42, 332

Standard wallboard 87-89, 316

Steelwork, encasement, fireprotection 224-226, 237

Steel framed wallslinings to 28, 59

Storage of plasterboard andcomponentsSee appropriate H&S information

Strap Hanger 333

Structural strength, theory 12

Stud partitionmetal 71-92, 99-132timber 93-95, 133-138

StudsAcoustic Homespan 115, 330C Studs 125-126, 330CH Studs 229, 331E Studs 229, 331I Studs 101, 330Omega stud 115, 331

Supreme Skim plaster 301, 326

Suspended ceiling 197

TapeFlex 292, 336Joint 292, 336Patching 336Resilient 208, 334

Taping and Jointing system 291

Tapered Edge wallboard 312

Tape-On Corners 296, 336

Telescopic deflection head 142

Texture finishes 305

Texture, Lafarge Universal 306, 325

TheoryAcoustics 14Fire 11Structural strength 12

Thermalcheck boards 319

Thermalcheck linings 23-27, 33

Tiling to plasterboard 159

Timber joist floors 163-169, 171,173-174, 179

Timber framed walls, linings to 28, 55

Timber stud partitions 93-95, 133

Toughcheckpartitions 74screws 327wallboard 314

TracksFlex Track 155J Track 229U Track 115, 125-126, 329

Trim Reveal Profile 270, 338

Twin frame systems 73, 77-80, 86,89, 99

U Tracks 115, 125-126, 329

Universal Texture, Lafarge 306, 325

Uplighter, Lafarge Profile 269, 270,338, 339

Vapourcheck wallboard 317

V Brace101-103, 334

Wainscot panel 253

Wall linings Contour 63Direct Bond 23, 29Dryliner 25-26, 41Independent 27, 47Metal Furring 38Thermalcheck 23-25, 27, 33to timber frame 28, 55

Wall panels, Fresco 251, 318

Wall tiling, ceramic 159

WallboardsAcoustic Homespan 317Baseboard 316Contour wallboard 318dBcheck wallboard 314Echeck wallboard 314Firecheck Coreboard 315Firecheck wallboard 315Firecheck, Moisture Resistant 315Fresco 318Hydrodeco 313Lath (round edge baseboard) 317Megadeco 313Moisturecheck wallboard 318Plank (19mm wallboard) 316Predeco 313Standard wallboard 316Thermalcheck boards 319Toughcheck wallboard 314Vapourcheck wallboard 317

Walls curved 154, 282

What can go wrong checklistwall linings 67partitions 160fire protection 246creative solutions 283

XR Bracket (Dryliner) 42, 188, 332

Z Step Profile 270, 338

Index

Other Business Units in the LafargeGroup:

Lafarge Cement

Manor House Chilton Oxfordshire OX11 0RN

t +44 (0) 1235 448400 f +44 (0) 1235 448600 www.lafargecement.co.uk

Lafarge Aggregates

Bradgate House Groby Leicestershire LE6 0FA

t +44 (0) 1530 242151 f +44 (0) 1530 243513 www.lafarge-aggregates.co.uk

Lafarge Roofing

Regent House Station Approach Dorking Surrey RH4 1TG

t +44 (0) 1306 872000 f +44 (0) 1306 872111 www.lafarge-roofing.co.uk

Lafarge Gyvlon Ltd

221 Europa BoulevardWestbrookWarringtonCheshireWA5 7TN

t +44 (0) 1925428780f +44 (0) 1925428788www.gyvlon-floors.co.uk

UK Sales Offices

For placing of orders and deliveryenquiries and general informationrelating to availability of products,stockists etc.

Orders can be placed free of chargeby ringing Orderline on: 0800 373636.

Literatureline

For next day delivery of Lafargeliterature, please call before 3pm.

t +44 (0) 1275 377582 f +44 (0) 1275 377402email [email protected]

England, Wales and Scotland

Lafarge Plasterboard LimitedMarsh Lane, Easton-in-Gordano,Bristol BS20 0NF

t +44 (0) 1275 377773f +44 (0) 1275 377737

Ireland

Lafarge Plasterboard (Ireland)Limited, Unit 38, Fonthill IndustrialPark, Clondalkin, Dublin 22

t +353 (0)1 6261603f +353 (0)1 6261679

The Drywall Training Centre

For all drywall training needs frombasic introduction to advanced skillsand development.

The Drywall Training CentreMarsh Lane, Easton-in-GordanoBristol BS20 0NF


Technical Enquiryline

For information and advice on alltechnical aspects of drywall.

Technical Advisory ServiceMarsh Lane, Easton-in-GordanoBristol BS20 0NF


Lafarge Plasterboard online

For information and advice on alltechnical aspects of drywall,including the SELECT 2 dynamicspecification generator, visit:


Trade Associations

Lafarge Plasterboard Limited is amember or an associate member ofthe following organisations:

Association of Building ComponentManufacturers (ABCM)

British Standards Institute (BSI)

Builders Merchants Federation (BMF)

Construction Industry Training Board(CITB)

Construction Products Association(CPA)

Federation of Plastering and DrywallContractors (FPDC)

Gypsum Products DevelopmentAssociation (GPDA)

New Homes Marketing Board(NHMB)

Association of Interior Specialists(AIS)

Association for Specialist FireProtection (ASFP)

Institute of Acoustics (IOA)

Other useful contacts

BSI British Standards HQ389 Chiswick High RoadLondonW4 4AL

t +44 (0)20 8996 9000 f +44 (0)20 8996 4001 www.bsi-global.com

HSE Health and Safety ExecutiveMagdalen HouseTrinity RoadBootleMerseysideL20 3QZ

HSE Infoline 0845 345 0055www.hse.co.uk

Office of the Deputy Prime MinisterEland HouseBressenden PlaceLondonSW1E 5DU

t +44 (0)20 7944 4400f +44 (0)20 7944 5719 www.odpm.gov.uk

Robust Details LtdPO Box 7289Milton KeynesMK14 6ZQ

t 0870 240 8210 f 0870 240 8203 www.robustdetails.com

R E F E R E N C E SCONTACTS AND TRADE ASSOCIATIONS

Contacts

TECHNICAL ENQUIRYLINE t 01275 377789 f 01275 377456 www.lafargeplasterboard.co.uk 377

Designed and produced for Lafarge Plasterboard by NBA Tectonics

The Lafarge Drywall Manual, August 2005supersedes The Drywall Manual, July 2003, January 2001, June 1999 and March 1998

Published by Lafarge Plasterboard Limited

Lafarge Plasterboard reserve the right to reviseproduct specifications without notice. Theinformation given in this publication is correct to the best of the publisher’s knowledge, but users must satisfy themselves as to the suitabilityof any particular product or detail for a specific application.

© 2005 Lafarge Plasterboard Limited

ISBN 0-9545693-2-6

10

CI/SfB | | Rf7 | |

August 2005

TH

ED

RYW

ALL

MA

NU

AL

’05

Rf7

THE

DRYWALLMANUAL


The Backing of a World LeaderLafarge is the world’s largest producer of construction materials including gypsumproducts, aggregates, roofing and cement. The preservation of natural resources and respect for the needs of people and the environment are fundamental to theorganisation’s business approach and philosophy

Sales OfficesFor placing of orders and delivery enquiries and general information relating to availability of products, stockists etc.

UK Orderline: 0800 373636Ireland Orderline: +353 (0)1 6203114


LiteraturelineFor next day delivery of Lafarge literature please call before 3pm.


England, Wales and ScotlandLafarge Plasterboard Limited, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF

T. +44 (0) 1275 377773F. +44 (0) 1275 377737

IrelandLafarge Plasterboard (Ireland) Limited, Unit 38, Fonthill Industrial Park, Clondalkin, Dublin 22

T. +353 (0)1 6261603F. +353 (0)1 6261679

The Drywall Training CentreFor all drywall training needs from basic introduction to advanced skills and development.

The Drywall Training Centre, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF


Technical EnquirylineTechnical Advisory Service, Marsh Lane, Easton-in-Gordano, Bristol BS20 0NF


WastelinePlease contact with your gypsum waste management enquiries.


For further information and contact numbers for our other business units please go to www.lafarge.co.uk

Certificate No. FM 13594 Certificate No. EMS 75024

Plasterboard, jointing and associated products made in the United Kingdom by Lafarge Plasterboard are manufactured in accordance with management systems certified to BS EN ISO 9001: 2000 (quality) and BS EN ISO 14001: 2004 (environment)

V2

Drywall Manual

Documents

Transcript of Drywall Manual