Non-ResidentialNewBuild...

Non - Residential New Build4.8 Fire Protection

August 2008: Issue 1

4.0Non-residential new build

Non-residential New Build

Sales 0844 800 0135 Technical Advisory Centre 01744 766666 www.knaufinsulation.co.uk

Introduction find online pageSolution optimiser and pathfinder 402Design considerations (Structural Steel) 403Design Considerations (Cavity Barriers) 404

Design Details 696

Fire Protection Contents

Structural steel find online page

Fire protection of structural steelwork Fp01 696(Fireboard)

Fire protection of structural steelwork Fp02 702(Rockslk FireTech Slab)

Cavity barriers

Small cavity barriers Fp03 712(Crown Cavity Barrier)

Small cavity barriers Fp04 714(Rocksilk Smoke and Fire Barrier)

Large cavity barriers Fp05 716(Rocksilk Smoke and Fire Barrier)

Refurbishment of timber separating floor Fp06 722

Fire protectionSolution optimiser and pathfinder

Sales 0844 800 0135 Technical Advisory Centre 01744 766666 www.knaufinsulation.co.uk402

4.8.1 Non-residential new build: Fire protection

Fire protection

Structural steelworkProduct*: Rocksilk FireTech SlabDescription: Dense rock mineral wool beamand column encasement system suitable formezzanine column systems

Page No: 702

Structural steelworkProduct*: Knauf FireboardDescription: A smooth reinforced gypsum board beam and column encasement system

Page No: 696

Mezzanine floorsProduct*: Rocksilk FireTech SlabDescription: Dense rock mineral wool beam and column encasement system

Page No: 712

Small cavity barriersProduct*: Crown Cavity BarrierDescription: Glasswool sleeved cavitybarrier for use in timber frame ormasonry structures

Page No: 714

Large cavity barrierProduct*: Rocksilk Smoke and Fire BarrierDescription: A suspended reinforcedrock mineral wool mattress for fire resistance above suspended ceilings

Page No: 716

Period of fire resistance (mins)

Knauf Insulation solution

Knauf Insulation are members of the Association for SpecialistFire Protection, and our fire protection products are listed in theYellow Book, which presents economical methods for the fireprotection of structural steelwork to provide compliance withBuilding Regulations

KeyFire resistance achievable by constructions within this document..

* Recommended Knauf Insulation product(s). Other products may be applicable.

Find online. Visit www.knaufinsulation.co.uk and key in construction code to find the most up to date information on your chosen solution.

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Fp04

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Sales 0844 800 0135 Technical Advisory Centre 01744 766666 www.knaufinsulation.co.uk 403

4.8.2Non-residential new build: Fire protection

Structural s teel

Structural steel requires fire protection because it losesstructural strength at temperatures that can be rapidlyreached in a building fire. This will consequently have a negative impact on the structural integrity of the building.Protecting the structural steel from the heat of a fire will delay the onset of this loss of strength and the possiblecollapse of the building. This is essential because it allowsextra time for both the occupants of the building to escapeand fire services to tackle the fire. It could also prevent theactual collapse of the building minimising insurance losses.Building Regulations covering fire safety are concerned with the preservation of life.

• Are fully compatible with drylining systemsand allow easy integration with partitioningschemes.

Fire protectionAny steel section which is an element of structure and is deemed by any of the following regulations to require fire resistance can be protected with a fire proofing system of dense mineral woolslabs or fibre reinforced gypsum based boards.

1. The Building Regulations 2000, ApprovedDocument B (Fire Safety) – Volume 2 Buildingsother than dwellinghouses (2006 Edition)

2. The Building (Scotland) Regulations 2004,Technical Booklets, Section 2, Fire

3. The Building Regulations (Northern Ireland) 2000, Technical Booklet E, 2005, Fire safety

4. Loss Prevention Council Code of Practice for Construction of Buildings

5. The Building Regulations (Republic of Ireland) Technical Guidance Document B (2006)

Steel sections can include universal beams,columns and joists (plain and castellated),structural and rolled tees, angles, channels andround, square or rectangular hollow sections.

With the increasing use of structural steel inconstruction, designers need fire protectionoptions that provide a combination of fastinstallation and cost-effectiveness whilst achievingthe desired finish.

Whatever the application Knauf Insulation has a range of board products and systems to caterfor any project.

When used for the fire protection of structuralsteelwork, board systems offer several compellingadvantages over site applied paint and spraycoating systems. Board systems:

• Are manufactured to factory tolerances – this enables the specifier to be certain that the correct thickness of fire protection is being applied, by simply checking the thickness of materials supplied

• Can be installed prior to the building being sealed and made watertight, in all temperature and humidity conditions – thisis in contrast to paint and sprays which are often restricted by normal UK winter conditions, causing potential delay to site programs

• Are fast, clean, and dry to install, with negligible dust levels, allowing other trades to work in close proximity

• Are quick and easy to check (by visual inspection) that all relevant areas have been protected

BenefitsBoth rock mineral wool and fibre reinforcedgypsum offer a number of advantages for the fireprotection of structural steelwork that make themideal for fast track projects.

Rock mineral wool• Lightweight product – at less than half the

weight of calcium silicate boards – stone wool fire protection boards are easy to handle and fit on site particularly for overhead work

• Ease of cutting and fixing: Mineral wool boards are easy to cut with either a saw or a sharp knife, furthermore there are four fixing methods, all involve square edge butt joints between the boards which enables a fast and simple system to be installed without delaying other trades and activities

Fibre reinforced gypsum• Smooth surface – only requires decorative

finishes for completion

• Robust and impact resistant – ideal for columns and all exposed surfaces

• Easy to cut to size – can be scored and snapped to speed up cutting and reducedust levels

Calculation of Hp (A/V) and ready reckonersGuidance on calculations for formulae for HpA(A/V) values and ready reckoners for beamand column constructions can be found inSection 6.7, pages 704-717.

Cavity barriers


4.8.3 Non-residential new build: Fire protection

In addition cavity barriers are also required to beplaced above fire resisting partitions. Both glassand rock mineral wool products are ideal to actas cavity barriers due to their inherent noncombustibility. In the case of stopping minorimperfections of fit it is acceptable to seal smallgaps filling with either product. However forspecific periods of fire resistance in small andlarge voids required by building regulations it is necessary to use specific products that havebeen tested and assessed to offer the requiredperformance when installed in a specific way, if necessary, using specific fixing components.

Small voids include the cavities in external wallsand voids beneath raised access floors. Largervoids include the spaces between suspendedceilings and soffits or roofs. This section dealsonly with small cavities.

In cavities in external walls the resilient propertiesof glasswool mean that it can be compressionfitted, between the outer leaf and the inner leaf orframe. The non combustible properties of theproduct allow it to resist the effects of fireenabling it to remain in place during a fireeffectively blocking the transfer of the fire throughthe cavity.

Every building must be designed and constructed in such a way that in the event of an outbreak of fire within thebuilding, the unseen spread of fire and smoke withinconcealed cavities in its structure and fabric is inhibited. The Building Regulations require cavity barriers to subdivide voids if they extend beyond certain dimensions.

Design considerations Concealed cavitiesFire and smoke spread in concealed spaces isparticularly hazardous because fire can spreadquickly throughout a building and remainundetected by the occupants of the building.

Cavity barriers are used to sub divide cavities and so prevent smoke and flame from by-passing fire-resisting walls and partitions. Themaximum distance between barriers must beappropriate to the location of each cavity. Also,due consideration must be given to the class ofsurface exposed within the cavity.

Cavity barriers should achieve at least 30 minutesfire resistance, providing a minimum of 30minutes integrity and 15 minutes insulation.

Detailed requirements are complex. For fulldetails about the position and spacing of cavityfire barriers refer to:

• Section 9 of Approved Document B (Fire safety) – Volume 2, Buildings other than dwellinghouses (2006 Edition) (England and Wales)

• Section 2.4 of Technical Handbook – Fire (Scotland)

• Section 3 of DFP Technical Booklet E: 2005 Fire Safety (Northern Ireland)

• Section 3 of Technical Guidance Document B(2006) Fire Safety (Eire)

Fixing systemsAny product used for fire protection can only beconsidered to be offering a specific period of fireprotection when it is installed in the mannerspecified in the appropriate fire test report. This includes the specification of all associatedfixings and supporting framing.

Fire protectionStructural steelwork


6.7 Design details: Fire protection

Typical construction

Knauf Fireboard is used in framelessencasements. The product has been speciallydeveloped to accept direct edge fixings.Casings consist of Knauf Fireboard screwed orstapled to itself at abutting corners.

For steelwork encased on all four sides, KnaufFireboard is fixed at each corner directlythrough the material, independent of the columnor beam. For partial encasement, involving wallor ceiling abutments, Knauf Fireboard is fixed tolight gauge steel angles.

Knauf Insulation recommend the use of KnaufFireboard Gripper Screws, essential for fastconstruction, solid fixing and tight edge joints.

ProductsKnauf Fireboard is a gypsum based boardspecially developed for high performance liningand encasement, providing up to two hours offire protection.

Knauf Fireboard has a high quality whitesmooth surface finish ideally suited as a selffinish. Its surface allows direct decoration withmost paint finishes or can be plastered*.

Knauf Fireboard Gripper Screws are goldpassivated screws with spoon tips and ‘hi-low’threads.

Knauf Fireboard can also be installed usingproprietary staples.

*Consult plaster manufacturer prior to application of plasterfinish.

Fp01Advantages� Quick and easy to install

� Dry fix system

� Combined fire protection andaesthetic finish

� Easy to cut

Edge fix the boards usingeither Knauf FireboardGripper Screws at maximum150mm centres orproprietary staples at120mm centres.

Knauf Fireboard

Knauf Fireboard Screws at maximum100mm centres into backing strips

Abutment angles: light gaugesteel angle provide support atsoffit and wall junctions. Fixed toadjoining soffit or section flange

697

6.7Design details: Fire protection


Typical specificationKnauf Fireboard, ...…mm thick, to be used toprovide fire protection to structural steelwork.

It is to be installed on beam*/ column* as acomplete 4 sided*/3 sided*/2 sided* encasement (*specifier’s choice) toprovide ......minutes fire protection asdetailed in the Installation section.

Please consult the NationalBuilding Specifications (NBS)based on clause 265A in sectionK10. It contains a set ofproprietary clauses, which areedited versions written by KnaufInsulation

PerformanceFire performanceThe system can provide up to 2 hours fireprotection. For precise calculation of fireprotection values, please contact KnaufInsulation Technical Advisory Centre.

Knauf Fireboard is non-combustibleto BS 476: Part 4: 1970 (1984) and Class 1surface spread of flame to BS 476: Part 7:1997. Knauf Fireboard complies with the Class‘0’ requirements of the Building Regulationswhen tested to BS 476: Part 6: 1989 and Part7: 1997 and with the limited combustibilitydescribed in the Building Regulations. Thesmoke production is negligible.

HumidityConstant humidity over 95% or subjection tocontinuous water will reduce the serviceabilityof the boards.

Operating temperaturesContinuous long term exposure to temperaturesover 50ºC can induce a change of state whichwould reduce physical performance andserviceability.

Health and safetyKnauf Fireboard must be installed with care.Ensure adequate ventilation during installation,particularly when cutting boards. Avoid harshbody contact with sharp cut edges of metalcomponents. Refer to Knauf Insulation Healthand Safety literature and to HSE publications.

Knauf Fireboard casing

Stagger joints 300mm minimum

Direct edge-fixing with KnaufFireboard Gripper Screws at 200mmcentres or proprietary staples at120mm centres

1 2 Hold in place thefirst 2 boardswith clamps.

3 After measuring thesize of the remaining2 sides, cut anothertwo to the depth ofthe column plustwice the thicknessof the board.

4 Apply the remainingboards, adjustingthe length ofadjoining boards toensure that boardjoints are staggeredby at least 300mm.

5 Edge-fix the boardsusing either selfdrilling KnaufFireboard GripperScrews at 200mmcentres or proprietarystaples at 120mmcentres.

The Knauf FireboardGripper Screw shouldpenetrate into thecasing by at least30mm

Installation sequence

Fire protectionInstallation of column system



Partial column encasementAssuming a typical three-sided encasementwhere one of the column flanges straddles awall, follow the same procedure as outlinedfor four-sided encasement with the followingdifferences:

• Fix 25 x 25mm light gauge steel angles,in continuous lengths, to either the abuttingwall face or the inner flange of the column.Use appropriate proprietary fixings at600mm centres

Double layer applicationInstall the first layer as described for either fullor partial encasement. Secure the second layerto the first with fixings spaced as for the firstlayer but avoid coinciding fixing positions.

It is good practice that board joints arestaggered – as with the first layer – betweenadjoining boards and also between the twolayers. In the case of structural steelwork,double layer encasement will obviate theneed for joint backing strips.

InstallationSteelwork encasements must be installed in fullaccordance with Knauf Insulation’srecommendations and in compliance with

BS 8212: 1995 and BS 8000: Part 8: 1989.

The installation procedures outlined here relateto normal single layer application.

Knauf Fireboard Gripper screwsThe Knauf Fireboard Gripper Screws shouldpenetrate into the casing by at least 30mm.

Four-sided column encasement• Cut two boards to the width of the column

flange. Cut another two to the depth of thecolumn plus twice the thickness of the board

• Adjust the length of adjoining boards toensure that board joints are staggered by atleast 300mm

• Edge-fix the boards using either self drillingKnauf Fireboard Gripper Screws at 200mmcentres or proprietary staples at 120mmcentres.

Cut two boards tothe width of thecolumn flange.

699



Fire protectionInstallation of beam system

Beam encasementAssuming a typical three-sided encasement,where a beam is exposed directly below a levelsoffit, fix light gauge steel angles to either theadjoining soffit or the top flange of the beam.Install continuous lengths of 25 x 25mm angleusing appropriate proprietary fixings at 600mmcentres.

• Fix further lengths of 25 x 25mm angle at anyend abutment

• Cut two boards to the depth of the sectionplus twice the thickness of the board plusl0mm. Screw-fix these to the angles at200mm centres

• Cut a soffit board to the width of the steelflange. The length of this board must differfrom the side boards to ensure adjacentboard joints are staggered by at least300mm. Edge-fix this horizontal board to thetwo vertical boards using either self-drillingKnauf Fireboard Gripper Screws at 150mmcentres or staples at 120mm centres

• Cut board offcuts 100mm wide as jointbacking strips. Fit these, half-lapped, behindall butt joints at the sides and soffit of thebeam fixed with Knauf Fireboard GripperScrews at maximum 100mm centres

Double layer applicationInstall the first layer as described for either fullor partial encasement. Secure the second layerto the first with fixings spaced as for the firstlayer but avoid coinciding fixing positions.

It is good practice that board joints arestaggered – as with the first layer – betweenadjoining boards and also between the twolayers. In the case of structural steelwork,double layer encasement will obviate the needfor joint backing strips.

Installation sequence

1 Install continuous lengths of25 x 25mm angle usingappropriate proprietaryfixings at 600mm centres, fixfurther lengths of 25 x 25mmangle at any end abutment.

2 Cut two boards to the depthof the section plus twice theboard thickness plus l0mm.

Screw-fix these to the anglesat 200mm centres.

3 Cut a soffit board to thewidth of the steel flange.The length of this board mustdiffer from the side boards toensure adjacent board jointsare staggered by at least300mm.

Edge-fix horizontal board tothe two vertical boards usingeither self-drilling KnaufFireboard Gripper Screws at150mm centres or proprietarystaples at 120mm centres.

4 Cut board offcuts 100mmwide as joint backing strips.Fit these, half-lapped, behindall butt joints at the sidesand soffit of the beam.

Fix with Knauf FireboardGripper Screws at maximum100mm centres.

Fire protectionApplication details for beams



25 x 25mm angle secured to top flange ofbeam, or alternatively to soffit

Beam with partition abutment

Beam with wall abutment

25 x 25mm angle secured to top flange ofbeam, or alternatively to soffit

Knauf Fireboard Gripper Screws atmaximum 100mm centres

Fireboard casing

Backing strip

10mm gap

Direct edge fixing with Knauf FireboardGripper Screws at maximum 150mmcentres or staples at 120mm centres

C-Stud partition with standardU-Channel head track

Knauf Fireboard Gripper Screwsat maximum 100mm centres

Fireboard casing

Direct edge fixing with KnaufFireboard Gripper Screws atmaximum 150mm centres orstaples at 120mm centres

Continuous 25 x 25mm KnaufFireboard Angle secured to substrateusing appropriate fixing

Masonry wall

701



Column with partition abutment

Knauf C-Stud toggle-fixed to KnaufFireboard casing

Knauf Wallboard not fixed to this C-Stud


Continuous 25 x 25mm KnaufFireboard angle at each corner



Column with wall lining abutment

Fire protectionStructural steelwork



Noggin of Rocksilk FireTechor Rocksilk FireTechDry Fix Noggin Slab

Pig Tail Screws

Rocksilk FireTech Slab

InstallationRocksilk FireTech Slab can be used with fourtypes of fixing systems for the fire protectionof structural steelwork.They are:

• Dry Fix Noggin System

• Adhesive Noggin Fixing System

• Combination Fixing System

• Welded Pin Fixing System

Each system has its own performancecharacteristics. See pages 698-701 forinstallation details.

Typical constructionThe exposed surfaces of any steel section arefully enclosed in Rocksilk FireTech Slab, usingany of the fixing systems shown on pages698-701.

Rocksilk FireTech Slab can be used to provideup to 4 hours fire protection to structural steeland cast iron columns, beams and trusses. Steelsections may include universal beams, columnsand joists (plain and castellated), structural androlled tees, angles, channels and round, squareor rectangular hollow sections.

ProductRocksilk FireTech Slab is a dense rock mineralwool slab. It is available unfaced and with abright Class ‘0’ reinforced aluminium foil, forapplications above clean rooms, within airplenums, or for aesthetic purposes.

Plaster manufacturers advice and guidanceshould be followed regarding pre treatment ofRocksilk FireTech Slabs before application ofplaster finishes

Rocksilk FireTech Dry Fix Noggin Slab is an ultrahigh density rock mineral wool slab speciallyused for the noggin in the Rocksilk FireTech DryFix Noggin System.

Fp02Advantages� Lightweight product

� Dimensionally stable

� Four installation methods

� Maintenance free

� Passive system

� Clean installation process

� No dust generation

703



Technical specificationRocksilk FireTech Slab, ...…mm thick, to beused to provide fire protection to structuralsteelwork.

It is to be installed using the dry fix nogginsystem*/adhesive noggin fixing system*/combination fixing system*/welded pinfixing system* (*specifier’s choice) asdetailed in the Installation section.

Please consult the NationalBuilding Specifications (NBS)based on clause K11/885. Itcontains a set of proprietaryclauses, which are editedversions written by KnaufInsulation.

PerformanceFire performanceRocksilk FireTech Slab is classified as non-combustible to BS 476: Part 4: 1970(1984),Class 1 surface spread of flame to BS 476: Part7: 1997, and Class ‘0’ to the BuildingRegulations. Rocksilk FireTech Slab is designedto provide up to 4 hours fire protection tostructural steelwork, thereby satisfying theBuilding Regulations and insurance demands forperiods of fire resistance.

DurabilityRocksilk FireTech Slab is rot proof, does notsustain vermin and will not encourage thegrowth of fungi, mould or bacteria.

Rocksilk FireTech Slab is odourless and non-hygroscopic.

Rocksilk FireTech Slab is non-wicking whentested to BS 2972: 1989: Section 12.

When exposed to 90% relative humidity and20ºC, Rocksilk FireTech Slab absorbs less than0.004% of moisture.

Noggin of Rocksilk FireTech orRocksilk FireTech Dry FixNoggin Slab

Pig Tail Screws


Structural steelStructural steel design

Achieving the required fire performanceThe required thickness of the product dependsupon the section factor of the structural steel tobe protected. The section factor is the heatedperimeter of the steelwork in metres, divided bythe cross sectional area of the steel in m2 (Hp/Aor A/V).

Calculating HpThe table opposite displays the calculationformulae for Hp for the major steelwork typesand fire protection situations. All dimensionsare measured in metres.

Calculating AA is the cross sectional area of the steel in m2.This may be calculated from the dimensions ofthe steel section itself,or from the formula:

A =mass per metre of steelwork

7850

Calculation formulae for HpSteel selection Box and solid protection

4 sides 3 sides 3 sides 2 sides 1 side

Universal beams,universal columnsand joists (plainand castellated)

Hp 2B + 2D B + 2D Partially B + D Partiallyexposed B + 2d exposed B

Structural and rolled(tees)

Hp 2B + 2D Flange to soffit Toe of web toB + 2D soffit B + 2D

Structural and rolled(angles)

Hp 2B + 2D Flange to soffit Toe of web toB + 2D soffit B + 2D

* The air space created in boxing a circular section improves the insulation and the valueof Hp/A. Therefore Hp higher than that for profile protection would be anomalous.Hence Hp is taken as the circumference of the tube and not 4D.

D

B

d

D

B

D

B



705



Calculation formulae for HpSteel selection Box and solid protection

4 sides 3 sides 3 sides 2 sides 1 side

Structural and rolled(channels)

Hp 2B + 2D Toe of web to Flange to soffitsoffit B + 2D B + 2D

Hollow sections(square or rectangular)

Hp 2B + 2D B + 2D

Hollow sections*(circular)

Hp

* The air space created in boxing a circular section improves the insulation and the valueof Hp/A. Therefore Hp higher than that for profile protection would be anomalous.Hence Hp is taken as the circumference of the tube and not 4D.

D

B

D

B

D

Structural steelStructural steel design

Columns ready reckonerRequired Hp/A values for commondimensions of universal columns

Serial size Mass/metre 3-sided 4-sided(mm (in)) (kg/m) (Hp/A) (Hp/A)

356 x 406 634 15 20(14 x 16) 551 20 25

467 20 30393 25 35340 30 35287 30 45235 40 50

356 x 368 202 45 60(14 x 14.5) 177 50 65

153 55 75129 65 90

305 x 305 283 30 40(12 x 12) 240 35 45

198 40 50158 50 65137 55 70118 60 8597 75 100

254 x 254 167 40 50(10 x 10) 132 50 65

107 60 7589 70 9073 80 110

203 x 203 86 60 80(8 x 8) 71 70 95

60 80 11052 95 12546 105 140

152 x 152 37 100 135(6 x 6) 30 120 160

23 155 210

Beams ready reckonerRequired Hp/A values for commondimensions of universal beams


914 x 419 388 45 55(36 x 16.5) 343 50 60

914 x 305 289 60 65(36 x 12) 253 65 75

224 75 85201 80 95

838 x 292 226 70 80(33 x 11.5) 194 80 90

176 90 100

762 x 267 197 70 85(30 x 10.5) 173 80 95

147 95 110

686 x 254 170 75 90(27 x 10) 152 85 95

140 90 105125 100 115

610 x 305 238 50 60(24 x 12) 179 70 80

149 80 95

610 x 229 140 80 95(24 x 9) 125 90 105

113 100 115101 110 130

533 x 210 122 85 95(21 x 8.5) 109 95 110

101 100 11592 110 12582 120 140

457 x 191 98 90 105(18 x 7.5) 89 100 115

82 105 12574 115 13567 130 150


457 x 152 82 105 120(18 x 6) 74 115 130

67 125 14560 140 16052 160 180

406 x 178 74 105 125(16 x 7) 67 115 140

60 130 15554 145 170

406 x 140 46 160 185(16 x 5.5) 39 190 215

356 x 171 67 105 125(14 x 6.75) 57 120 145

51 135 16045 150 180

356 x 127 39 165 195(14 x 5) 33 195 225

305 x 165 54 115 140(12 x 6.5) 46 135 160

40 150 185

305 x 127 48 120 145(12 x 5) 42 140 160

37 155 180

305 x 102 33 175 200(12 x 4) 28 200 230

25 225 255

254 x 146 43 120 150(10 x 5.75) 37 140 170

31 165 200

254 x 102 28 175 200(10 x 4) 25 190 225

22 220 255

203 x 133 30 145 180(8 x 5.25) 25 170 210

203 x 102 23 175 205(8 x 4)

Establishing board thicknessTo establish the board thickness required forsteel column and beam encasements, proceedas follows:

• Locate the appropriate size of beam orcolumn on the table and read off its Hp/AFactor depending on whether 3 or 4 sidedprotection is required

• Establish the period of fire resistance required

• Refer to the adjoining table to determine theboard thickness required

• For castellated sections, please contact ourTechnical Advisory Centre



707



Section factor tables for columnsusing Rocksilk FireTech SlabThickness in mm for various periods of fire resistance and section factors.

Section factor tables for beamsusing Rocksilk FireTech SlabThickness in mm for various periods of fire resistance and section factors.

Section factor tables for beamsand columns using Knauf FireboardThickness in mm for various periods of fire resistance and section factors.

Fire protectionInstallation of Rocksilk FireTech



Adhesive Noggin Fixing SystemUp to 2 hours fire protection

Attach web pieces to nogginswith Pig Tail Screws at100mm centres.

Dry Fix Noggin SystemUp to 2 hours fire protection

Welded Pin Fixing SystemUp to 4 hours fire protection

Combination Fixing SystemUp to 3 hours fire protection

Attach web pieces tonoggins with Pig TailScrews at 100mm centres.

The use of a dense rock mineral wool slabrequires no special vee cuts, drilling orsub-frames, making it fast and easy to install.Mineral wool slabs can be easily cut usinghand or power tools.

Note: Rocksilk FireTech Dry Fix Noggin Slab has a densityof 200 kg/m3.

The Combination Fixing SystemCan be used to provide up to 2 hours fireprotection to all sizes of structural steelwork,and up to 3 hours fire protection to steelworkwith section factors (Hp/A) of up to 133m-1 forcolumns and 143m-1 for beams.

The Welded Pin Fixing SystemCan be used to provide up to 3 hours fireprotection to all sizes of structural steelwork,and up to 4 hours fire protection to steelworkwith section factors (Hp/A) of up to 172m-1 forcolumns and 184m-1 for beams.

If section factors are above 260m-1 contact ourTechnical Advisory Centre.

Alternative installation methodsThe Dry Fix Noggin SystemIs a fast and efficient friction fit noggin systemthat does not require adhesive. It can give up to2 hours fire protection to BS 476: Part 21.When installing 20, 25 and 30mm FireTechSlab a 30mm Rocksilk FireTech Dry Fix NogginSlab should be used. When greater thicknessesof FireTech Slab are used, the correspondingthickness of Rocksilk FireTech Dry Fix Slabshould be used.

The Adhesive Noggin Fixing SystemCan be used to provide up to 2 hours fireprotection to all sizes of structural steelwork.

100mm wide noggins ofRocksilk FireTech Dry FixNoggin Slab friction fittedbetween the flanges.

Attach flange pieces to webpieces using Pig Tail Screwspositioned 25mm in fromeach end and at 150mmcentres.

Attach flange pieces toweb pieces using Pig TailScrews positioned 25mmin from each end and at150mm centres.

100mm wide noggin ofRocksilk FireTech Slabglued into place usingsuitable adhesive

Attach the Rocksilk FireTechSlab web pieces by impalingover the welded pins andsecuring in place with 38mmspring steel washers.

Attach flange pieces to webpieces using Pig Tail Screwsat 150mm centres.

Adhesive should be used atthe joint between subsequentweb pieces.

Attach the Rocksilk FireTechSlab web and flange piecesby impaling over the 3mmdiameter welded mild steelpins and securing in placewith 38mm spring steelwashers.

Adhesive should be used atthe joint between subsequentweb pieces.

709



Adhesive Noggin fixing systemNoggins are cut 100mm wide from 20mm thickRocksilk FireTech Slab. They should be cut to asuitable length relative to the web size to givea tight compression fit.

Noggins are glued top and bottom using atypical adhesive thickness of 0.5mm and frictionfitted between the flanges at 600mm centres.

The noggins should be installed in such a waythat they are slightly 'proud' of the flange (byabout 2mm) and such that they coincide withjoints between the boards.

It is preferable to leave the noggins in positionfor 4 hours to allow the adhesive to cure.However, where this is impractical RocksilkFireTech Slab can still be fitted before theadhesive cures since the noggins are essentiallyfriction fitted.

For web depths greater than 500mm,T-shaped or solid noggins should be used,formed from Rocksilk FireTech Slab, andscrewed together using Pig Tail Screws.

Attach web pieces to noggins using Pig TailScrews at 100mm centres

Solid noggin formed from one or more piecesof Rocksilk FireTech Slab

Greaterthan

500mmFull

depth

100mm

T-shaped noggin formed from two pieces ofRocksilk FireTech Slab joined at right anglesusing Pig tail screws

Insert noggins as described at 600mmcentres and if practicable leave for 4 hoursfor adhesive to cure.

Cut Rocksilk FireTech Slab to size as follows:

Beams: flange pieces to dimension X, webpieces to dimension Y + t (t = thickness ofboard)

Columns: flange pieces to dimension X,web pieces to dimension Y + 2t

100mm

Greaterthan

500mm

Y

X

Attach flange pieces to web pieces using PigTail Screws positioned 25mm in from eachend at 150mm centres.

Note: For flanges greater than 400mm use welded pinand spring steel washers to provide extra retention ofthe flange piece of insulation. The welded pins shouldbe located along the centre line of the flange at 300mm

centres.

Fire protectionApplication details for beams



Partition abutment using a noggin fixing system

Wall abutment using a noggin fixing system

Pig tail screws at maximum100mm centres

Direct edge fixing with Pig Tail Screws atmaximum 150mm centres

Attach flange piece to web piece byimpaling over welded pins and securingthe board to board joint with Pig TailScrews at 150mm centres. Spring steelwashers are used over the welded pins toretain the insulation, any excess pinlength being trimmed off

FireTech casing

C-Stud partition with standard U-Channelhead track

Pigtail Screws at maximum 100mm centres

Attach flange piece to web piece by impalingover welded pins and securing the board toboard joint with Pig Tail Screws at 150mmcentres. Spring steel washers are used overthe welded pins to retain the insulation, anyexcess pin length being trimmed off


FireTech casing

Masonry wall

711



Column with wall lining abutment

Column with partition abutment

Adhesive detailThe adhesive use for gluing Rocksilk FireTechSlabs should be a thixotropic paste type basedon soluble solids of silicate and potassiummixed with clay or refractory mineral filler to anapproximate ratio of 70:30 by weight.Steelwork should ideally be dry but thepresence of condensation will merely prolongthe cure time, not weaken the bond strength.

Since only the top and bottom surface of eachnoggin is glued with a typical adhesivethickness of 0.5mm, excellent rates of usage areachievable.Note: Steelwork should be clean and free from grease priorto the application of adhesive.

* For further details contact our Technical Advisory Centre.

FireTech casing

Masonry wall




FireTech casing


Pigtail screwsThe spirally wound or pig tail screws aremade from 16 gauge galvanised wire andare available from stockists. A specificationis available on request from our TechnicalAdvisory Centre.

The screws should be installed flush at 150mmcentres on board to board joints and 100mmcentres over noggins, using either power orhand tools. There is no need to countersinkscrew heads.

Fire protectionMezzanine floors



Advantages� Installation is fast, clean and dry

� Compatible with mezzanine columnsystems

� Easy to cut

� Complies with all current BuildingRegulations and fire performancerequirements

� Is able to achieve up to 3 hours fireresistance

� System covers Section Factors up to310 Hp/A (A/V)

PerformanceFire performanceRocksilk FireTech Slab is classified as non-combustible to BS 476: Part 4: 1970 (1984).Class 1 surface spread of flame to BS 476:Part 7:1977, and Class ‘O’ to the BuildingRegulations. Rocksilk FireTech Slab is designedto provide up to 3 hours fire protection to thesupporting mezzanine column system, therebysatisfying the current Building Regulations andinsurance demands for periods of fireresistance.

PerformanceRocksilk FireTech Slab is rot proof, does notsustain vermin and will not encourage thegrowth of fungi, mould or bacteria. RocksilkFireTech Slab is odourless and non-hygroscopic.

ProductRocksilk FireTech Slab is a dense rock mineralwool slab specifically designed for the fireprotection of structural steelwork.

Typical constructionThe exposed surface of a steel section is fullyenclosed in Rocksilk FireTech Slab, using ametal clip, snap-lock system.

InstallationThe column case is pre-fabricated to suit thespecific beam or column. It is lined with RocksilkFiretech Slab which is pre-bonded to the steelskin. Note that no adhesive is applied to thejoints between individual slabs. The columncase is made of galvanized or PVC coated steelminimum 0.7mm thick. For columns, the casingis normally supplied in two pieces with theclosing face fixed with snap-lock joints.

Three-sided encasements are secured at 300mmcentres to continuous galvanized steel angles,or the flange of the steel section, or to the wallor floor at 500mm nominal centres.Alternatively the casing may be secured usingan integral lip on the casing.

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713Sales 0844 800 0135 Technical Advisory Centre 01744 766666 www.knaufinsulation.co.uk

Technical specificationRocksilk FireTech Slab….mm thick, to beused to provide fire protection to structuralsteelwork in a mezzanine floor system.

Table 98: Mezzanine floors

Time - mins Board Thickness (mm) Hp/A60 20 224

25 26030 31035 31040 31045 310

90 20 9125 11530 13935 16540 19045 21750 24455 26060 27065 310

120 20 5725 7230 8735 10240 11745 13350 14955 16560 18165 198

180 30 4935 5840 6645 7550 8455 9260 10165 110

Advantages� Meets Building Regulation

requirements for both fire andacoustics

� Simple to install and fix dueto flanges on all thicknesses

� Easy identification by colourcoded polythene for stockistand contractor

� Dimensionally stable and robust

Fire protectionSmall cavity barriers



InstallationIn vertical applications, both flanges of theCrown Cavity Barrier should be fixed to theinner leaf.

In horizontal applications, the top flange ofthe polythene sleeve should be fixed to theinner leaf.

All joints and intersections of Crown CavityBarriers should be closely butted.

Typical constructionCrown Cavity Barriers are engineered toprevent the spread of smoke and fire throughwalls, floors and cavities in timber frame, metalframe and masonry buildings.

They are also suitable for reducing flankingnoise transmission in these concealed cavities.

The use of the correct size of Crown CavityBarrier is essential. Crown Cavity Barriers aredesigned to compress to a tight fit in cavitiesand in the event of fire breaking into the cavity,Crown Cavity Barriers do not rely on thepolythene flanges to hold them in place, but ontheir compression between the inner leaf andexternal brickwork or blockwork.

It is, therefore, essential to specify the CrownCavity Barrier by reference to the actualconstructed cavity width. Table 95 shows thethree thicknesses that are available.

ProductCrown Cavity Barrier is manufactured from acontinuous length of non-combustible glassmineral wool which is compressed within aresilient polythene sleeve incorporating twoflanges designed for ease of fixing.

This polythene sleeve is colour-coded to suit avariety of cavity widths from 50mm to 100mmand eliminates the need for weather protectionduring installation.

The barriers are 1200mm long and can beused in both vertical and horizontalapplications, and are available in two standarddepths (100mm and 300mm). 100mm barriersare used for normal fire stopping and noisereduction applications. 300mm barriers areused where higher performance levels arespecified and at party wall/external wall cavityjunctions.

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Crown Cavity Barrier stapled through top flange tosheathing to fully fill the cavity

Brick outer skin

715



Technical specificationTimber frame constructionCrown Cavity Barrier 100mm*/ 300mm*wide, coloured yellow*/ blue*/ white* to befriction fitted in the positions shown on thedrawings. Crown Cavity Barrier to fully fillthe depth of the cavity.

The plastic flanges to be stapled to thetimber*/sheathing board* to hold the cavitybarrier in place.


Please consult the NationalBuilding Specifications (NBS)based on clause P10/420.It contains a set of proprietaryclauses, which are editedversions writtenby Knauf Insulation.

Masonry constructionCrown Cavity Barrier 100mm*/ 300mm*wide, coloured yellow*/ blue*/ white* tobe friction fitted in the positions shown onthe drawings.

Crown Cavity Barrier to fully fill the depthof the cavity.


Please consult the NationalBuilding Specifications(NBS) based on clauseP10/420. It contains a setof proprietary clauses, whichare edited versions writtenby Knauf Insulation.

PerformanceFire performanceCrown Cavity Barriers are manufactured fromglass mineral wool which has a Euroclass A1fire rating when classified in accordance withBS EN 13501-1.Crown Cavity Barriers have been tested for fireresistance in accordance with BS 476: Part 8:1972 and will provide 60 minutes stability,integrity and insulation. This is covered by theWarrington Fire Report No.151215.

Acoustic performanceBuilding Regulations require the use of a cavitycloser to reduce flanking noise transmissionalong party wall cavities and external wallcavities in masonry and timber frameconstructions.

Crown Cavity Barriers meet the genericdescription for cavity closers and will thereforeensure compliance with Part E and RobustDetails in timber frame and masonryconstructions.

Table 99: Colour coding

Cavity width Colour

(mm)

50-65 yellow

66-80 blue

81-100 white

Timber frameseparating wall

300mm wide Crown Cavity Barrier – stapledto sheathing either side of separating wall

100mm wide Crown CavityBarrier – stapled to timber orply sheathing betweenseparating walls

Fire protectionLarge cavity barrier



Advantages� System uses standard metal

components

� System achieves Building Regulationrequirements for both insulationand integrity

� System offers both fire and acousticperformance

For one hour fire resistanceTwo layers of 50mm Rocksilk Smoke and FireBarrier, separated by a 50mm air space,applied as a hanging curtain with wire mesh tothe outside, supported continuously from aboveand both sides, using the fixings listed in table100 on page 719. At the base it is eitherlapped freely on to the back of a suspendedceiling, or fixed to a partition head.

Use foil faced Rocksilk Smoke and Fire Barrierwhen the ceiling void is used as an air plenum.

InstallationSee page 718-721 for installation details.See page 719 for specification of fixings andsupporting metalwork.

Typical constructionFor half an hour fire resistanceA single layer of 50mm Rocksilk Smoke andFire Barrier, applied as a hanging curtain,supported continuously from above and bothsides, using the fixings listed in the table 100on page 719. At the base it is either lappedfreely on to the back of a suspended ceiling orfixed to a partition head. Suitable for drops upto 7 metres.

Use foil faced Rocksilk Smoke and Fire Barrierwhen the ceiling void is used as an air plenum.

ProductRocksilk Smoke and Fire Barrier is made fromrock mineral wool and formed into a flexiblemattress faced on one side with galvanisedwire mesh stitched in position.

Rocksilk Smoke and Fire Barrier is alsoavailable foil faced on one or both sides.

Rocksilk Smoke and Fire Barrier must beinstalled in accordance with the specificationsdetailed below and on Pages 718 - 721.If these specifications are not strictly followedthe installation cannot be deemed to offer anyspecific period of fire protection.

Fixing components:Angle: Mild steel of dimensions 50 x 50 x 2mmor 60 x 40 x 2mm

Strip: Flat mild steel strip of dimensions40 x 2mm

See table 100 on page 719 for suitable methodof fixing angles and strips to substrate.

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Rocksilk Smoke andFire Barrier fixed to 50mmtimber spacer

Metal angle fixed to soffit

Rocksilk Smoke and Fire Barrier

50mm airgap

717



Metal anglesfixed to soffit

Rocksilk Smokeand Fire Barrier

Rocksilk Smoke and Fire Barrierfixed to timber spacer

Technical specificationHalf hour cavity barrierA single layer of 50mm Rocksilk Smoke andFire Barrier (*foil faced) to be installed in thepositions marked on the drawings, and fixedin accordance with the manufacturer’srecommendations. All joints either tightlybutted, overlapped, or with edges returned,and stitched in a continuous spiral loop with1mm diameter galvanised lacing wire.(* delete as appropriate)

One hour cavity barrierTwo layers of 50mm Rocksilk Smoke andFire Barrier (*foil faced), separated by a50mm air space to be installed in thepositions marked on the drawings, andfixed in accordance with the manufacturer’srecommendations. All joints either tightlybutted, overlapped, or with edges returned,and stitched in a continuous spiral loop with1mm diameter galvanised lacing wire.(* delete as appropriate)

Please consult the NationalBuilding Specifications (NBS)based on clause K40/425. Itcontains a set of proprietaryclauses, which are editedversions written by KnaufInsulation.

PerformanceFire performanceRocksilk Smoke and Fire Barrier is made fromrock mineral wool and is classified as non-combustible to BS 476: Part 4: 1970. RocksilkSmoke and Fire Barrier has a Class 1 surfacespread of flame to BS 476: Part 7: 1997 and isClass ‘0’ to the Building Regulations.

When subjected to full-scale fire resistance teststo BS 476: Part 22: 1987, a system comprisingone layer of 50mm Rocksilk Smoke and FireBarrier, fixed using components as specified onpage 719 and by methods detailed on thefollowing pages achieved 19 minutesinsulation, and retained its integrity for 35minutes, after which time the test wasdiscontinued. 50mm Rocksilk Smoke and FireBarrier thereby satisfies the criteria laid down inthe Building Regulations for cavity barriers, byexceeding the minimum requirement of 15minutes insulation and 30 minutes integrity .

When subjected to full-scale fire resistance teststo BS 476: Part 22: 1987, a system comprisinga double layer of 50mm Rocksilk Smoke andFire Barrier, fixed as specified on page 718-719, achieved 61 minutes insulation, andretained its integrity for 66 minutes, after whichtime the test was discontinued.

A double layer of 50mm Rocksilk Smoke andFire Barrier thereby satisfies the criteria laiddown in the Building Regulations for one hourcavity barriers.

These tests incorporated vertical and horizontaljoints between barriers. Fire resistance iseffective from either side of the barrier. Whentested, the wire side was exposed to thefurnace. This is the side most vulnerable to fire.

Fire protectionInstallation of half hour cavity barrier



80mmminimum

1. Metal angle fixed to purlin 2. Fixed to purlin 3. Fixed to rib of coffered slab

4. Fixed across coffered ceiling 5. Perimeter fixing with steel strip 6. Junction with ceiling

At the ceiling junction, the Rocksilk Smoke andFire Barrier is cut and draped on and betweenthe joists, and secured by fixing to steel angle,which is itself fixed to the joists (Figure 6). Forsuspended ceilings (see Figure 11, page 720).

At partitions or wall heads, if a secure fixing isavailable, as at soffits, the Rocksilk Smoke andFire Barrier should be clamped by steel strip

Two layers of 50mm Rocksilk Smoke and FireBarrier with a 50mm air space between themare needed for one hour fire resistance. Ingeneral two separate layers should be installedback to back, each in a manner identical to thatshown for half hour fire resistance. The joints inthe two layers should be staggered and theRocksilk Smoke and Fire Barrier returnedoutward at the top and bottom. The wirereinforced sides should be placed outward(Figure 7). Fixing details are givenon pages 720-721.

Concrete DecksThe Rocksilk Smoke and Fire Barrier is clampedbetween the deck and steel angle secured byexpanding bolts. If the deck is coffered it shouldusually be possible to locate the cavity barrieralong one of the ribs (Figure 3). If fitted acrossthe coffering it should be clamped by steel strip,to the steel angle which is secured to the ribs.

If the depth of coffering is less than 100mm, theRocksilk Smoke and Fire Barrier should bereturned at the top by 300mm, to allow forcutting at the ribs and pushed securely into thecoffering (Figure 4). If the depth of coffering isgreater than 100mm the Rocksilk Smoke andFire Barrier should be fixed around the cofferingusing steel angle, as described above.Alternatively, proprietary profile fillers may beused.

The perimeter of the barrier should be securedwith steel strip (Figure 5).

Installation

The following information and illustrationsoutline typical details for the installation of largecavity barriers. In case of uncertainty, refer toKnauf Insulation. Specification details for fixingand supporting metalwork are given on page719.

Metal deck with overdeck insulationIf the Rocksilk Smoke and Fire Barrier runs withthe slope of the roof, a supporting steel angleshould be fixed between purlins and the smokeand fire barrier clamped to this with steel strip(Figure 1). The insulation should project 80mmbeyond the strip to ensure a good seal.

If fitted across the sheeting profile, the RocksilkSmoke and Fire Barrier should be bolted to thepurlins (Figure 2). It is returned at the top, to alength equivalent to 3 times the profile depth, toallow for cutting at troughs and pushingsecurely into profiles. Alternatively, proprietaryprofile fillers may be used.

719



7. Fixed to concrete slab 8. Fixing to wall head

10. Fixing at perimeter9. Fixing to timber spacer

Partitions and Wall HeadsIf possible, the Rocksilk Smoke and Fire Barriershould be secured with steel strip to the partitionor wall head so as to maintain the 50mm airspace (Figure 8). If this is not possible, it shouldbe draped with a return of at least 150mm, orfixed to a timber spacer which is fixed to thepartition or wall head (Figure 9).

Perimeter FixingThe Rocksilk Smoke and Fire Barrier should besecured with steel strip to the sides of theperimeter wall, so as to maintain the 50mm airspace (Figure 10).

Fire protectionInstallation of one hour cavity barrier

Angle fixings to concrete decks and steel sections: angles 50 x 50 x 2mm

Fire resistance Maximum spacing of fixings (m) for the following drop heights (m)period (mins) 3 3.5 4 4.5 5 5.5 6 6.5 7

30 2 2 2 2 2 2 2 2 260 2 2 1.75 1.5 1.5 1 1 0.75 0.75

Key: M8 bolts M6 bolts

Angle fixings to timber beams and trusses: angles 50 x 50 x 2mm

Fire resistance Maximum spacing of fixings (m) for the following drop heights (m)period (mins) 3 3.5 4 4.5 5 5.5 6 6.5 7

30 2 2 2 2 2 2 2 2 2

120 2 2 1.75 1.5 1.5 1 1 0.75 0.75

Key: Buildex HT screws, minimum 25mm thread penetration into timberBuildex HT screws, minimum 40mm thread penetration into timber

Steel strip fixings: To masonry and concrete Buildex Tapcon 4H masonry anchorsTo timber Buildex HT range of fixingsTo steel angle Steel bolts

Minimum return of Rocksilk Smoke and Fire Barrier - When clamped to flat surface (vertical or horizontal)80mm. When loose laid over horizontal surface - 150mm.

Fixing system specificationsTable 100: Specification of angles and stripsAngle: Mild steel of dimensions 50 x 50 x 2mm or 60 x 40 x 2mmStrip: Flat mild steel strip of dimensions 40 x 2mm

Fire protectionJointing Rocksilk Smoke and Fire barrier



Suspended ceilingsWith suspended ceilings where positive fixingto wall heads or partition heads is not possible,the weight of Rocksilk Smoke and Fire Barrierand the stiffness of wire facing are such that itwill form an effective seal if it laps thehorizontal surface by a minimum 150mm.Lapped joints are only permissible where thesuspended ceiling has the same fire resistanceas the cavity barrier. Rocksilk Smoke and FireBarrier must be slit and fitted around anycrossing tees to eliminate gaps and ensure thatexcessive loads are not transferred to the ceiling(Figure 11).

JointingThis section describes the approved methods forjoining adjacent pieces of Rocksilk Smoke andFire Barrier. The methods are applicable to bothhalf and one hour large cavity barriers.

12. Vertical butt joint 13. Vertical returned joint 14. Vertical lap joint

500mmminimumoverlap

15. Perpendicular joint 16. Horizontal joint at a drop

Vertical and horizontal jointsThree methods of securing the joints betweenadjacent pieces of Rocksilk Smoke and FireBarrier are approved.

Joints are tightly butted together and stitched ina continuous spiral loop with 1mm diametergalvanised lacing wire. The stitching shouldpass through the reinforcement mesh and thewool on each side of the butt joint at centres notexceeding 100mm (Figure 12).

Alternatively the Rocksilk Smoke and FireBarrier edges are returned at least 80mm andwired together (Figure 13), or they may belapped at least 100mm and wired together(Figure 14).

Perpendicular jointsThe junction between two barriers should besecurely wired together (Figure 15) with areturn of at least 80mm.

DropsAll barriers can be used for drop heights up to5m without additional support.For drops between 5m and 7m it is necessaryto introduce additional supporting members inorder to support the weight of the fire barriers(Figure 16).

Services which are permitted by BuildingRegulations to penetrate barriers, shouldbe provided with collars of Rocksilk Smoke andFire Barrier at least 300mm long, sewn to themain barrier and then strapped or wired so asto avoid any possibility of gaps (Figure 17).

A half hour barrier requires a collar onone side of the barrier. A one hour barrierrequires one collar on both sides of the barriersystem. Reference should be made to BuildingRegulations Approved Document B, B3,Section 9.

11. Junction with suspended ceiling

721



Penetrating steelwork etc.This should be provided with a collar of RocksilkSmoke and Fire Barrier at least 300mm long(Figure 18). The collar is fixed to the concrete ormetal deck by clamping against these surfacesbehind steel angle. The voids in the steelworkare filled with Rocksilk Smoke and Fire Barrier(figure 18). A half hour barrier requires a collaron one side of the barrier. A one hour barrierrequires one collar on both of the layers of thebarrier system.

AccessWhere permanent access is needed through thebarrier, a fire door and frame, rated to theappropriate fire resistance, must be used. TheRocksilk Smoke and Fire Barrier should be fixedsecurely to the frame.

300mmminimum

17. Penetrating pipe

19. Temporary framework to ease handling

18. Penetrating steelwork

HandlingDepending on the size of the barrier and theworking space available, it is sometimes difficultto hold the material in place while top fixingsare being secured. It will be found helpful tomake a temporary prop from, e.g. slottedangle. This may comprise a crosspiece of lengthappropriate to the width of the Rocksilk Smokeand Fire Barrier, with studs on the top which willhook into the wire mesh of the Rocksilk Smokeand Fire Barrier. This may be swivelled on thetop of a handle, and secured horizontally or tothe angle of the roof by an adjustable brace. Itis used to hold the Rocksilk Smoke and FireBarrier up, 100mm or so behind the fixinglocation, while fixing is being carried out.When fixing to a sloping deck, the top of theRocksilk Smoke and Fire Barrier should betrimmed to the correct angle to ensure that jointsare truly vertical (Figure 19).

Following tradesThe integrity of barriers must be restored ifdisturbed by following trades, either duringthe building process or after completion.This instruction should be incorporated intothe building handbook

Fire protectionPenetrating pipes and ducts



Separating floorsRefurbishment of timber separating floor

Minimum 18mm Chipboard100mm Rocksilk Universal Slab RS33or 100mm Rocksilk Flexible Slab

Support mesh stapled to joists

Existing ceiling

Advantages� Existing ceiling can be

retained, avoiding disruptionto rooms below

� Provides thermal and acousticinsulation as well as fireresistance

� Meets the requirements ofApproved Document E for soundresistance for internal floors

InstallationAfter removal of the floor deck, line the voids inthe floor with 25mm wire mesh, to form asupport tray for the insulation. Staple the wiremesh to the sides of the joists, at least 40mm upfrom ceiling level.

Cut 100mm Rocksilk Universal Slabs RS33 orRocksilk Flexible Slabs to size and lay onto thewire mesh support, so that there are no gapsbetween the insulation and the joists. Butt jointthe insulation slabs so there are no gapsbetween them.

Fix a chipboard floor deck, at least 18mm thick,over the entire floor area.

Typical constructionThe use of Rocksilk Universal Slab RS33 orRocksilk Flexible Slab in a suspended timberfloor achieves one hour fire resistance, whilstallowing the existing ceiling to be retained.

To achieve one hours fire resistance:

• The floor deck should be at least 18mm thicktongued and grooved chipboard or timberboarding

• The joists must be at least 200mm deep and37mm wide

• The wire mesh should be stapled to the sidesof the joists at least 40mm above the ceilinglevel

• Any ceiling can be used

ProductsRocksilk Universal Slab RS33 is a semi rigidrock mineral wool slab.

Rocksilk Flexible Slab is a multi-purpose rockmineral wool flexible friction-fit slab for use in arange of acoustic, thermal and fire resistantapplications.

IntroductionWhere the loft space of a two storey house isconverted into habitable accommodation, thefloor to the new rooms must have a 30-minutefire resistance over any part of the escape routedirectly below. This is often the case when, forexample, the floor of the new room extendsover a landing in the stairway enclosure below.The solution on this page provides the requiredperiod of fire protection without having toupgrade the existing ceiling.

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723



Typical specificationLay 100mm Rocksilk Universal SlabRS33/Rocksilk Flexible Slab on 25mmchicken wire mesh, stapled to sides of joistsat least 40mm up from ceiling level and at600mm centres. The joists should be at least200 x 37mm and spaced at not more than600mm centres. The flooring board to be atleast 18mm thick.

Please consult the NationalBuilding Specifications (NBS)based on clause T10/240. Itcontains a set of proprietaryclauses, which are editedversions written by KnaufInsulation.

Performance

Fire performanceRocksilk Universal Slab RS33 and RocksilkFlexible Slab are classified as Euroclass A1 toBS EN ISO 13501-1 and non-combustible toBS 476: Part 4: 1970 (1984), class 1 surfacespread of flame to BS 476: Part 7: 1997 andClass ‘0’ to the Building Regulations.

Existing wall

Minimum 18mm chipboard

100mm RocksilkUniversal Slab RS33 orRocksilk Flexible Slab

Wire mesh stapled to joists to providesupport for Rocksilk Universal SlabRS33 or Rocksilk Flexible Slab

Existing ceiling

Rocksilk Flexible Slab/Rocksilk UniversalSlab RS33 cut and pushed down betweenlast joist and wall

Typical wall floor junction

6.0

www.knaufinsulation.co.uk

www.thinkinsulation.com

Knauf Insulation Ltd.PO Box 10Stafford RoadSt HelensMerseysideWA10 3NS

Customer Service (Sales)Tel: 0844 800 0135Fax: 01744 612 007email: [email protected]

Technical Advisory Centre (TAC)Tel: 01744 766666Fax: 01744 766667email: [email protected]

LiteratureTel: 08700 668 660Fax: 0870 400 5797email: [email protected]

August 2008: Issue 1

Ref: KB58908

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