CI/SfB Ballytherm Ltd

Readers are advised to check the validity of this Certificate by either referring to the BBA’s website (www.bbacerts.co.uk) or contactingthe BBA direct (Telephone Hotline 01923 665400).

1 The Building Regulations 2000 (as amended) (England and Wales)

The Secretary of State has agreed with the British Board of Agrémentthe aspects of performance to be used by the BBA in assessing thecompliance of thermal insulation with the Building Regulations. In the

opinion of the BBA, Ballytherm BTF, BTDL and BTR, if used in accordance withthe provisions of this Certificate, will meet or contribute to meeting the relevantrequirements.Requirement: A1 Loading

Comment: Floors incorporating these products can meet thisRequirement. See the tinted area of the Floor loading sectionof the relevant accompanying Detail Sheet.

Requirement: B3(4) Internal fire spread (structure)

Comment: Cavities incorporating the products can meet thisRequirement. See the tinted area of the Behaviour in relationto fire section of the accompanying Detail Sheets.

Requirement: C2(a)(c) Resistance to moisture

Comment: Elements incorporating the products can meet thisRequirement. See the relevant tinted areas of theCondensation section of the accompanying Detail Sheets.

Requirement: L1(a)(i) Conservation of fuel and power

Comment: See relevant tinted areas of the Thermal performance sectionsof the accompanying Detail Sheets.

Ballytherm LtdAnnagh Industrial ParkBallyconnellCo CavanIrelandTel: 00 353 49 952 7000 Fax: 00 353 49 952 7002e-mail: [email protected]: www.ballytherm.ie

AgrémentCertificate

No 07/4427

Designated by Governmentto issue

European TechnicalApprovals

BALLYTHERM BTF, BTDL AND BTRIsolationWärmedämmung

Product

Regulations — Detail Sheet 1• THIS CERTIFICATE OFCONFIRMATION RELATES TOBALLYTHERM BTF, BTDL ANDBTR. THESE PRODUCTS ARECLOSED CELL, RIGID FOAMPOLYISOCYANURATE COREWITH EITHER FOIL OR KRAFTFACINGS.• The products aremanufactured and marketedby the Certificate holder.

These Front Sheets must beread in conjunction with theaccompanying Detail Sheets,which provide informationspecific to the particular boardsand application.Confirmation of Irish Certificate No05/0220, issued by the IrishAgrément Board to Ballytherm Ltd,Annagh Industrial Park, Ballyconnell,Co Cavan, Ireland.

CI/SfB

Rn7 (M2)

2

Requirement: Regulation 7 Materials and workmanship

Comment: The products are acceptable materials. See the tinted areas ofthe Durability section of the accompanying Detail Sheets.

2 The Building (Scotland) Regulations 2004

In the opinion of the BBA, Ballytherm BTF, BTDL and BTR, if used inaccordance with the provisions of this Certificate, will satisfy orcontribute to satisfying the various Regulations and related Mandatory

Standards as listed below.Regulation: 8 Fitness and durability of materials and workmanshipRegulation: 8(1) Fitness and durability of materials and workmanship

Comment: The products can contribute to a construction satisfying thisRegulation. See the Durability section and Installation part ofthe accompanying Detail Sheets.

Regulation: 9 Building standards — constructionStandard: 1.1(a)(b) Structure

Comment: Floors incorporating these products can satisfy this Standard,with reference to clauses 3.15.1(1), 3.15.3(1) and 3.15.4(1).See the relevant tinted area of the Floor loading section of therelevant accompanying Detail Sheet.

Standard: 2.4 Cavities

Comment: The products can contribute to satisfying this Standard, withreference to clauses 2.4.6(1) and 2.4.8(2). See the tinted areaof the Behaviour in relation to fire section of theaccompanying Detail Sheets.

Standard: 3.15 Condensation

Comment: The products can satisfy, or contribute to satisfy this Standard,with reference to clauses 3.15.1(1) to 3.15.4(1). See therelevant tinted areas of the Condensation section of theaccompanying Detail Sheets.

Standard: 6.2 Building insulation envelope

Comment: The products can satisfy or contribute to satisfying thisStandard, with reference to clauses 6.2.1(1)(2) (Table 1) and6.2.4(1)(2). See the relevant tinted areas of the Thermalperformance section of the accompanying Detail Sheets.

Regulation: 12 Building standards — conversions

Comment: All comments given for the insulation under Regulation 9, alsoapply to this Regulation, with reference to clauses 0.12.1(1)(2)

and Schedule 6(1)(2).(1) Technical Handbook (Domestic).

(2) Technical Handbook (Non-Domestic).

3 The Building Regulations (Northern Ireland) 2000 (as amended)

In the opinion of the BBA, Ballytherm BTF, BTDL and BTR, if used inaccordance with the provisions of this Certificate, will satisfy orcontribute to satisfying the various Building Regulations as listed below.

Regulation: B2 Fitness of materials and workmanship

Comment: The products are acceptable materials. See the tinted areas ofthe Durability section of the accompanying Detail Sheets.

Regulation: C5 Condensation

Comment: Elements incorporating the products can meet this Regulation.See the relevant tinted areas of the Condensation section ofthe accompanying Detail Sheets.

Regulation: D1 Stability

Comment: Floors incorporating these products can meet this Regulation.See the tinted area of the Floor loading section of the relevantaccompanying Detail Sheet.

Regulation: E3 Internal fire spread — Linings

Comment: Cavities incorporating the products can meet this Regulation.See the tinted area of the Behaviour in relation to fire sectionof the accompanying Detail Sheets.

Regulation: F2(a)(i) Conservation measures

Comment: See the relevant tinted areas of the Thermal performancesection of the accompanying Detail Sheets.

Technical Specification

5 Delivery and site handling5.1 Ballytherm BTF, BTDL and BTR boards aredelivered to site in polyethylene shrink-wrappedpacks containing a label bearing themanufacturer’s trade name, product description,and the BBA identification mark incorporating thenumber of this Certificate.

5.2 Care must be taken to avoid damagingcorners and edges.

5.3 The boards must be protected from prolongedexposure to sunlight and should be stored eitherunder cover or protected with opaque polyethylenesheeting. Where possible, packs should be storedinside. If stored outside, the products should bestacked flat and raised above ground level, andnot in contact with ground moisture.

5.4 The boards must not be exposed to openflame or other ignition sources.

Design Data

6 Proximity of flues and appliancesWhen installing Ballytherm BTF, BTDL and BTRboards in close proximity to certain flue pipesand/or heat-producing appliances, the relevantprovisions of the national Building Regulations areacceptable:England and WalesApproved Document J

ScotlandMandatory Standard 3.19

Northern IrelandTechnical Booklet L.

7 Materials in contact — wiring installationsThe boards do not present a risk of reactionbetween them and PVC insulated electric cableswhen they are in contact. As with any other form ofinsulation, de-rating of electrical cables should beconsidered where the insulation restricts the aircooling of cables.

3

4 Construction (Design and Management) Regulations 1994 (as amended)

Construction (Design and Management) Regulations (Northern Ireland)1995 (as amended)

Information in this Certificate may assist the client, planning supervisor,designer and contractors to address their obligations under these Regulations.See section: 5 Delivery, storage and site handling (5.4) of these Front

Sheets and the General (Installation) section of the relevantDetail Sheet.

Conditions of Certification

8 Conditions8.1 This Certificate:• relates only to the product/system that is named

and described on the front page• is granted only to the company, firm or person

named on the front page — no other company,firm or person may hold or claim any entitlementto this Certificate

• is valid only within the UK• has to be read, considered and used as a

whole document — it may be misleading andwill be incomplete to be selective

• is copyright of the BBA• is subject to English law.

8.2 References in this Certificate to any Act ofParliament, Statutory Instrument, Directive orRegulation of the European Union, British,European or International Standard, Code ofPractice, manufacturers’ instructions or similarpublication, are references to such publication inthe form in which it was current at the date of thisCertificate.

8.3 This Certificate will remain valid for anunlimited period provided that the product/systemand the manufacture and/or fabrication includingall related and relevant processes thereof:• are maintained at or above the levels which

have been assessed and found to be satisfactoryby the BBA

• remain covered by a valid Irish Agrément; and• are reviewed by the BBA as and when it

considers appropriate.

8.4 In granting this Certificate, the BBA is notresponsible for:• the presence or absence of any patent,

intellectual property or similar rights subsisting inthe product/system or any other product/system

• the right of the Certificate holder to manufacture,supply, install, maintain or market theproduct/system

• individual installations of the product/system,including the nature, design, methods andworkmanship of or related to the installation

• the actual works in which the product/system isinstalled, used and maintained, including thenature, design, methods and workmanship ofsuch works.

8.5 Any information relating to the manufacture,supply, installation, use and maintenance of thisproduct/system which is contained or referred to inthis Certificate is the minimum required to be metwhen the product/system is manufactured,supplied, installed, used and maintained. It doesnot purport in any way to restate the requirementsof the Health & Safety at Work etc Act 1974, or ofany other statutory, common law or other dutywhich may exist at the date of this Certificate; noris conformity with such information to be taken assatisfying the requirements of the 1974 Act or ofany statutory, common law or other duty of care. Ingranting this Certificate, the BBA does not acceptresponsibility to any person or body for any loss ordamage, including personal injury, arising as adirect or indirect result of the manufacture, supply,installation, use and maintenance of thisproduct/system.

In the opinion of the British Board of Agrément, Ballytherm BTF, BTDL and BTR, are fit for theirintended use provided they are installed, used and maintained as set out in this Certificate.Certificate No 07/4427 is accordingly awarded to Ballytherm Ltd.

On behalf of the British Board of Agrément

Date of issue: 27th March 2007 Chief Executive

British Board of AgrémentBucknalls Lane, GarstonWatford, Herts WD25 9BAFax: 01923 665301

©2007For technical or additional information,contact the Certificate holder (seefront page).For information about the AgrémentCertificate, including validity andscope, tel: Hotline 01923 665400,or check the BBA website.

e-mail: [email protected]: www.bbacerts.co.uk

Readers are advised to check the validity of this Detail Sheet by either referring to the BBA’s website (www.bbacerts.co.uk) or contactingthe BBA direct (Telephone Hotline 01923 665400).


1 Description1.1 Ballytherm BTF Floor Insulation comprises aclosed cell, rigid polyisocyanurate foam core,sandwiched with trilaminate foil facings on bothsides. The foam is CFC and HCFC free and haszero ozone depletion potential (Zero ODP).

1.2 The boards are available in nominalcharacteristics of:length (mm) 1200, 2400width (mm) 600, 1200thickness (insulation) (mm)(1) 25 to 200compressive strength (kNm–2) �70nominal density (kgm–3) 35 to 45(1) Other thicknesses available to special order.

1.3 The manufacturing specification of the boardsis in accordance with EN 13165 : 2001,Section 4.2 and the relevant parts of Section 4.3.

1.4 Ancillary items include saddle clips, nails andpre-treated battens.

Design Data

2 General2.1 Ballytherm BTF Floor Insulation is effective inreducing the U value (thermal transmittance) of newor existing concrete or timber floors.

2.2 Ground-supported concrete floorsincorporating the boards must include a suitabledamp-proof membrane laid in accordance with the

relevant clauses of CP 102 : 1973, Section 11(see section 7 of this Detail Sheet).

2.3 Suspended concrete or timber ground floorsincorporating the boards must include suitableventilation of the sub-floor void (see section 7 of thisDetail Sheet).

2.4 The overlay to the boards should be:

• a cement-based floor screed (minimum 65 mm),laid in accordance with the relevant clauses ofBS 8204-1 : 2003 and/or BS 8204-2 : 2003,or

• wood-based floor, eg tongue-and-groove,flooring grade, particle board (Type P4 to P7) toBS EN 312 : 2003 or oriented strand board oftype OSB/2 to OSB/4 to BS EN 300 : 2006,18 mm thick (minimum), installed in accordancewith DD ENV 12872 : 2000, or

• a concrete slab.

3 Thermal performance3.1 Calculations of the thermal transmittance(U value) of a floor construction should be carriedout in accordance with BS EN ISO 6946 : 1997,BS EN ISO 13370 : 1998 and BRE report(BR 443 : 2006) Conventions for U-valuecalculations using the declared thermal conductivity(�90/90 value) of 0.022 Wm–1K–1.

3.2 The U value of a floor will depend on thethickness of the board, the perimeter/area ratioand the use of the product. Examples of U valuesfor ground supported, suspended beam and blockand suspended timber are given in Table 1.

• THIS DETAIL SHEET RELATES TO BALLYTHERM BTF FLOORINSULATION.• The product is for use on ground-supported or suspended concrete ortimber floors.• The product is used to reduce the thermal transmittance of new orexisting floors of dwellings or buildings of similar occupancy, type andcondition.• It is essential that the floors comply with the conditions set out in theDesign Data and Installation parts of this Certificate.

This Detail Sheet must be read in conjunction with the Front Sheets, which givethe Conditions of Certification.

Certificate No 07/4427

DETAIL SHEET 2Ballytherm Ltd

BALLYTHERM BTF FLOOR INSULATION

Product

CI/SfB

(99:534) Rn7 (M2)

Table 1 Floor values(1) (Wm–2K–1)

Floor Perimeter/ Insulation thickness (mm)type area ratio 25 50 70 75

Slab on 0.2 0.24 0.18 0.16 0.15ground 0.4 0.34 0.24 0.20 0.19supported 0.6 0.40 0.27 0.22 0.21

0.8 0.44 0.29 0.23 0.221.0 0.46 0.30 0.24 0.23

Suspended 0.2 0.25 0.19 0.16 0.16beam and 0.4 0.32 0.24 0.19 0.19block 0.6 0.36 0.26 0.21 0.20

0.8 0.39 0.27 0.22 0.211.0 0.41 0.28 0.22 0.21

Suspended 0.2 0.29 0.24 0.20 0.20timber 0.4 0.38 0.30 0.25 0.24

0.6 0.44 0.34 0.27 0.260.8 0.47 0.36 0.28 0.271.0 0.49 0.37 0.29 0.27

(1) Excluding edge insulation for the ground-supported floor system.

3.3 Subject to the selection of anappropriate insulation thickness, floorconstruction can improve on the U value of

0.25 Wm–2K–1 for a ‘notional’ building specified inTable R1 of Appendix R of The Government’sStandard Assessment Procedure for Energy Ratingof Dwellings (SAP 2005) or the Simplified BuildingEnergy Model (SBEM), see Table 1. The producttherefore, can contribute to enabling a building tomeet the Target Emission Rate ‘average’improvements of 20% (dwellings) and 23 to 28%(buildings other than dwellings).

England and WalesApproved Documents L1A and L2A.

Northern IrelandAs specified in Technical Booklets F1 and F2.

3.4 The product can maintain, or contribute tomaintaining, continuity of thermal insulation atjunctions between the floor and other buildingelements. Guidance in this respect, and on limitingheat loss by air infiltration, can be found in:

England and WalesLimiting thermal bridging and air leakage : Robustconstruction details for dwellings and similarbuildings TSO 2002.

Northern IrelandAccredited Construction Details (version 1.0).

3.5 Compliance with the guidance referred to insection 3.4 including airtightness measures, willallow the use of the default psi values from Table 3of BRE Information Paper IP 1/06 Assessing theeffects of thermal bridging at junctions and aroundopenings and Table K1 of The Government’sStandard Assessment Procedure for Energy Ratingof Dwellings, SAP 2005, in Target Emission Ratecalculations to SAP 2005 or the Simplified BuildingEnergy Model (SBEM).

3.6 When installed in floors of existing buildings,the product can meet, or contribute to meet, therelevant requirements of the following guidancedocuments:

England and Wales

Approved Document L1B, section 2, L2B, section 3

Northern Ireland

As specified in Technical Booklets F1 and F2,section 3.

3.7 Subject to the selection of anappropriate insulation thickness, a floor cansatisfy the Elemental target U value of

0.25 Wm–2K–1 specified in Table 1 to clause6.2.1 of the Technical Handbooks.

3.8 The product can maintain, or contribute tomaintaining, continuity of thermal insulation atjunctions between floor and other buildingelements. Guidance in BRE report (BR 262 :2002) Thermal insulation : avoiding risks isacceptable.

4 CondensationInterstitial condensation

4.1 Floors will adequately limit the risk ofinterstitial condensation when they aredesigned and constructed in accordance

with BS 5250 : 2002, Section 8.5 and AppendixD. The product has a water vapour resistivityexceeding 250 MNsg–1m–1.

4.2 When the product is used above the damp-proof course on a ground-supported floor, or on abeam-and-block floor, a vapour control layer isinstalled on the warm side of the insulation toinhibit the risk of interstitial condensation.

4.3 For a timber suspended ground floor, it is notnecessary to introduce a vapour control layer as longas adequate sub-floor cross ventilation is provided.

Surface condensation

4.4 Floors will adequately limit the risk ofsurface condensation when the thermaltransmittance (U value) does not exceed

0.7 Wm–2K–1 at any point, and the junctions withwalls are designed in accordance with the relevantrequirements of TSO publication Limiting thermalbridging and air leakage : Robust constructiondetails for dwellings and similar buildings, 2002or BRE Information Paper IP 01/06.

4.5 Floors will adequately limit the risk ofsurface condensation when the thermaltransmittance (U value) does not exceed

1.2 Wm–2K–1 at any point. Guidance may beobtained from Section 8 of BS 5250 : 2002 andBRE report (BR 262 : 2002).

2

5 Floor loading5.1 The design loadings for self-contained dwellingunits, as defined in BS 6399-1 : 1996, are:intensity of distributed load (kPa) 1.5concentrated load (kN) 1.4

5.2 The insulation boards covered withtimber-based board or screed can supportthese design loadings without undue

deflection.

5.3 A BRE survey of imposed floor loading indomestic buildings (see BRE current paper No 2/77Floor loadings in domestic buildings — the resultsof a survey) indicates that loadings in flats arecommonly in the region of 0.6 kPa and loadings of1.5 kPa are normally associated with fixed items.5.4 Where the boards are used under a concreteslab, resistance to concentrated and distributedloads is a function of the slab specification.

6 Behaviour in relation to fire6.1 The product achieved a Class 1 surfacespread of flame rating when tested toBS 476-7 : 1997.

6.2 The boards do not prejudice the fireresistance properties of the floor.

6.3 When properly installed the boards will notadd significantly to any existing fire hazard. Theboards will be contained within the floor by theoverlay until the overlay itself is destroyed andtherefore will not contribute to the development ofa fire or present a smoke or toxic hazard as the firedevelops.

6.4 Where the boards are to be used in exposedor semi-exposed intermediate timber floors such asrooms above a garage, the other floor materialsand overall design must be selected to achieve theperiod of fire performance required.

7 Moisture penetrationFor floors subject to national Building Regulations,construction should be detailed or designed inaccordance with:England and WalesApproved Document C, Section 4


Northern Ireland

Technical Booklet C, Section 1.

8 DurabilityThe boards are rot-proof, dimensionallystable and, when installed with the overlaysas specified in this Detail Sheet, will remain

effective as an insulating material for the life of thebuilding in which they are incorporated.

Installation

9 General9.1 Installation of Ballytherm BTF Floor Insulationmust be in accordance with the Certificate holder’sinstallation instructions and the requirements ofthis Certificate.

9.2 Typical methods are shown in Figure 1.Reference should also be made to BRE report(BR 262 : 2002).

9.3 All concrete floor surfaces should be smooth,level and flat to within 5 mm when measured witha 2-metre straight-edge. Irregularities greater thanthis must be removed. Minor irregularities (up to10 mm deep) may be levelled with mortar or thinscreed.

9.4 In ground-supported concrete floors, theconcrete floor slab over which the boards are laidshould be left for as long as possible to maximisedrying out and dissipation of constructionalmoisture, in accordance with BS 8203 : 2001,Section 3.1.2.

9.5 Where the boards are used over ground-supported concrete floor slabs a suitable damp-proof membrane in accordance with CP 102 :1973, Section 11, and BS 8204-1 or -2 : 2003,should be laid to resist moisture from the ground. Ifa liquid-type damp-proof membrane is applied tothe slabs, it should be of a type compatible withthe boards and be allowed to dry out fully beforelaying the boards.

9.6 Where the boards are used on hardcore basesunder ground-supported concrete slabs, the hardcoremust be compacted and blinded with a thin layerof sand before application of the boards.

9.7 The boards can be used on beam and blocksuspended concrete floors, that are the subject of acurrent Agrément Certificate and installed inaccordance with, and within the limitationsimposed by that Certificate, or those designed andinstalled to the precast concrete and generalloading codes, that have been assessed assuitable.

9.8 Where a screed or concrete slab is laid overthe product, vertical upstands of insulation shouldbe provided and be of sufficient depth to fullyseparate the screed or slab from the wall andprovide a minimum thermal resistance of0.75 m2KW–1. Alternatively, a suitable cavity orexternal wall insulation material can be extendedbelow the damp-proof course and a minimum of150 mm below the top of the floor insulation toprovide edge insulation to the floor. In this case,vertical upstands of insulation may not benecessary.

9.9 In suspended timber floors, the insulationboards are installed between the floor joists.

3

Figure 1 Typical installation

4

9.10 To limit the risk of damage fromcondensation and other sources of dampness, theboards and the overlay should only be laid afterthe construction is made substantially weathertight,eg after glazing. During construction the boardsmust also be protected from water spillage, plasterdroppings and traffic.

9.11 The boards can be cut using a sharp knifeor fine-toothed saw to fit around servicepenetrations.

10 Procedure10.1 The boards are cut to size, as necessaryand laid with closely-butted, staggered cross-joints,ensuring that all spaces are completely filled.

10.2 The laying pattern should ensure that all cutedges are at the perimeter of the floor or someother feature, eg mat wells, thresholds or accessducts. Spreader boards should be used to protectthe boards.

Timber-based board overlays 10.3 Before laying the particle board or OSBoverlays, pre-treated timber battens, in accordancewith BS 1282 : 1999, are positioned atdoorways, access panels and to support partitions.Adequate time should be allowed for CCA-basedpreservatives to be fixed and the solvents fromsolvent-based preservatives to evaporate.

10.4 A continuous vapour control layer withsealed joints of polyethylene sheet with a minimumthickness of 0.25 mm, is laid between the boardsand the overlay board. The polyethylene sheet has150 mm overlaps taped at the joints and is turnedup 100 mm at the walls.

10.5 Tongue-and-groove 18 mm thick particleboard (type P4 to P7), or OSB/3 or OSB/4 is laidwith staggered cross-joints in accordance withDD ENV 12872 : 2000.

10.6 An expansion gap between the overlayboard and the perimeter walls or abutmentsshould be provided at the rate of 2 mm per metrerun or a minimum of 10 mm, whichever is thegreater.

10.7 Where there are long, uninterrupted lengthsof floor, eg corridors, proprietary expansion jointsshould be installed at intervals on the basis of a2 mm gap per metre run of overlay board.

10.8 Before the overlay boards are interlocked,a waterproof PVA adhesive is applied to the joints.

10.9 Once the overlay board is laid, temporarywedges are inserted between the walls and thefloor to maintain tight joints until the adhesivehas set.

10.10 When the wedges are removed andbefore the skirting boards are fixed, suitablecompressible filler, eg foamed polyethylene, should

be fitted around the perimeter of the floor betweenthe overlay board and the walls.

10.11 Where there is a likelihood of regularwater spillage, eg in rooms such as kitchens,bathrooms, shower and utility rooms, additionaloverlay board protection should be considered,eg by a continuous flexible vinyl sheet flooring,with welded joints and cove skirting.

Cement-based screed overlay10.12 Perimeter edge pieces are cut and placedaround the edges and all floor joints taped, or a0.125 mm polyethylene sheet laid over before aproperly-compacted screed of a minimum 65 mmthickness is laid in domestic and 75 mm in otherbuildings. The relevant clauses of BS 8204-1 :2003 or BS 8204-2 : 2003 should be followedand BRE Building Elements Floors & Flooring,Chapter 4.2 should be consulted.

Concrete slab overlay (ground bearing only)10.13 The boards are laid over the dpm andperimeter edge pieces are cut and placed aroundthe edges and taped at joints. The vapour controllayer or building paper is laid over the boards. Theconcrete slab is laid to the required thickness inaccordance with BS 8000-9 : 2003 andBS 8204-1 : 2003.

Timber floors10.14 Saddle Clips are placed at intervals notexceeding one metre along the timber floor joists.Where the boards are to be installed only on oneside of a joist, twin clips can be cut into single clipsand nailed into place with galvanized nails.

10.15 Alternatively, the boards may be retainedby preservative-treated timber support beads orsteel nails. Beads should be wide enough to retainthe boards in place and secured with corrosion-protected nails at a depth that will accommodatethe thickness of the insulation board and leave anair gap (minimum 25 mm) between the top of theinsulation board and the underside of the flooringdeck.

10.16 Boards are cut to fit tightly between joistsand pushed down onto the spikes of the saddleclips, or onto the beads. Small gaps should beinsulated with cut strips of insulation.

10.17 The boards are not suitable for laying overtimber joists.

10.18 The void below the insulated, suspendedtimber floor should be well ventilated and theairflow should not be restricted by sleeper walls.

11 Incorporation of services11.1 The maximum continuous workingtemperature of the boards is 100°C. De-rating ofelectrical cables should be considered whereinstallation restricts air cooling of cables.

5

11.2 Where possible, electrical conduits, gasand water pipes or other services should becontained in ducts or channels within the concreteslab. Where this is not possible, the services maybe accommodated within the insulation, providedthey are securely fixed to the concrete slab.Electrical cables should be enclosed in a suitableconduit. With hot pipes the insulation must be cutback to maintain an air space.

11.3 Flooring incorporating gas pipes should bedesigned and installed in accordance with therequirements of the Gas Safety (Installation andUse) Regulations 1998.

11.4 Where water pipes are installed below theinsulation they should be pre-lagged. Generally,insulation will be relatively thin so it would not bepossible to install pipes within the insulation. Pipesinstalled above the insulation will not requirelagging, although some provision needs to bemade for expansion and contraction.

11.5 Where the boards are installed on a floor ofa suspended beam and block design, all servicesmust be installed in accordance with the AgrémentCertificate for that floor.

11.6 On overlay particle board floors, insituations where access to the services is desirable,a duct may be formed by mechanically fixing tothe floor, timber bearers of the same thickness asthe insulation to provide support for a particleboard cover. The duct should be as narrow aspossible and not exceed 400 mm in width or themaximum particle board spans given inDD ENV 12872 : 2000 without intermediatesupport. Services should be suitably fixed to thefloor base and not to the insulation boards (seesection 3.5 with regard to limiting heat loss).

11.7 On intermediate/exposed floors all theservices should be incorporated beneath theexisting floor and above the insulation if possible.

Technical Investigations

The following is a summary of the technicalinvestigations carried out on Ballytherm BTF FloorInsulation.

12 TestsTests were carried out in accordance withEN 13165 : 2001 to determine:• load deformation under elevated temperature

and specified compressive load• thermal conductivity (� value)• compressive strength• flatness on one-sided wetting • long-term water absorption by total immersion• dimensional stability under specified temperature

and humidity conditions.

13 Investigations13.1 An examination was made of test data toEN 13165 : 2001 relating to:• dimensions• squareness• density• � value (fresh and aged)• diffusion tight property of facings.

13.2 A theoretical risk analysis of thehygrothermal behaviour of various installations wascarried out.

6

BibliographyBS 476-7 : 1997 Fire tests on building materialsand structures — Method of test to determine theclassification of the surface spread of flame ofproducts

BS 1282 : 1999 Wood preservatives —Guidance on choice, use and application

BS 5250 : 2002 Code of practice for control ofcondensation in buildings

BS 6399-1 : 1996 Loading for buildings — Codeof practice for dead and imposed loads

BS 8000-9 : 2003 Workmanship on buildingsites — Code of practice for cement/sand floorscreeds and concrete floor toppings

BS 8203 : 2001 Code of practice for installationof resilient floor coverings

BS 8204-1 : 2003 Screeds, bases and in-situfloorings — Concrete bases and cement sandlevelling screeds to receive floorings — Code ofpracticeBS 8204-2 : 2003 Screeds, bases and in-situfloorings — Concrete wearing surfaces — Codeof practice

BS EN 300 : 2006 Oriented Strand Boards (OSB)— Definitions, classification and specifications

BS EN 312 : 2003 Particleboards —Specifications

BS EN ISO 6946 : 1997 Building componentsand building elements — Thermal resistance andthermal transmittance — Calculation method

BS EN ISO 13370 : 1998 Thermal performanceof buildings — Heat transfer via the ground —Calculation methods

CP 102 : 1973 Code of practice for protection ofbuildings against water from the ground

EN 13165 : 2001 Thermal insulation products forbuildings — Factory made rigid polyurethane foam(PUR) products — Specification

DD ENV 12872 : 2000 Wood-based panels.Guidance on the use of load-bearing boards infloors, roofs and walls

7





1 Description1.1 Ballytherm BTDL Dry Lining Board Insulationcomprises a rigid polyisocyanurate closed cellfoam core, sandwiched with kraft paper with apolyethylene membrane on both sides. The foam isCFC and HCFC free and has zero ozonedepletion potential (Zero ODP). The insulation isbonded to tapered edge plasterboard for internalapplications.

1.2 The insulation boards are available withnominal characteristics of:length (mm) 2400width (mm) 1200thickness (mm) 20 to 80compressive strength (kNm–2) �70density (kgm–3) 19 to 43


1.4 The boards are installed in conjunction withtimber battens and appropriate lining boards, forexample standard gypsum plasterboard toBS EN 520 : 2004.1.5 Ancillary materials include large-headed nails,screws, washers, aluminium joint tape and sealant.

Design Data

2 General2.1 Ballytherm BTDL Dry Lining Board Insulationwill significantly improve the thermal insulation ofnew and existing, solid or cavity masonry walls

(masonry includes clay and calcium silicate bricks,concrete blocks or natural and reconstituted stoneblocks) or walls of dwellings and buildings ofsimilar occupancy, type and condition.

2.2 The walls of new buildings should bedesigned and constructed in accordance with therelevant codes of practice, eg BS 5628-3 : 2005and BS 8000-3 : 2001.

2.3 All walls must be in a good state of repairwith no evidence of rain penetration, damp (otherthan surface condensation) or frost damage.2.4 The surfaces of masonry walls should besound and free from loose material; largeprojections should be removed and holes filled andlevelled. A survey of the wall may be required toestablish the extent of any packing that may berequired to ensure a uniform plane for the boardsto be fixed.

2.5 The installation of insulated dry lining systemsrequires careful detailing around doors andwindows to achieve a satisfactory surface forfinishing. In addition, every attempt should bemade to minimise the risk of cold bridging atreveals and where heavy separating walls areattached to the external wall. In new work theconstruction must be designed to accommodate thethickness of the dry lining, particularly at reveals,heads, sills and in relation to ceiling height. Onexisting walls consideration should be given tolining the reveals with a thinner layer of insulationand lining board.

2.6 Services can be incorporated in the voidformed between the insulation and the liningboards, making chasing of the wall unnecessary.Where the services have a greater depth than thevoid, the wall should be chased in preference to

• THIS DETAIL SHEET RELATES TO BALLYTHERM BTDL DRY LININGBOARD INSULATION.• The product is for use in conjunction with appropriate internal liningboards as an insulating dry lining system to improve the thermal insulationof existing and new, solid or cavity masonry walls of dwellings orbuildings of similar occupancy, type and conditions.• The product may also be used in locations where the insulated surface isinaccessible, eg existing ceilings of flat roofs.




BALLYTHERM BTDL DRY LINING BOARDINSULATION

Product

CI/SfB

(22.9) Rn7 (M2)

the insulation. It is recommended that servicespenetrating the insulation or any vapour checklining board, eg light switches, power outlets,be kept to a minimum to limit possible penetrationof water vapour.

2.7 When the system is to be installed in existingbuildings it should be realised that a smallreduction in room size will occur and thatpermanent fixtures, eg baths, will presentdifficulties.

3 Thermal performance

3.1 Calculations of the thermal transmittance(U value) of a specific wall construction usinginsulated dry lining should be carried out inaccordance with BS EN ISO 6946 : 1997, andBRE report (BR 443 : 2006) Conventions forU-value calculations, using the declared (� 90/90value) thermal conductivity of 0.026 Wm–1K–1 forthe dry lining, comprising a PIR board with Kraftpaper facings. The U value of a typical wallconstruction will depend on the cavity width andthe insulation value of the internal block leaf andfinish. Example U values are given in Table 1.

3.2 Subject to the selection of anappropriate insulation thickness, wallconstruction can improve on the Elemental

U value of 0.35 Wm–2K–1 for a ‘notional‘ buildingas specified in Table R1 of Appendix R of TheGovernment’s Standard Assessment Procedure forEnergy Rating of Dwellings (SAP 2005) or theSimplified Building Energy Model (SBEM), seeTable 1. The product, therefore can contribute toenabling a building to meet the Target EmissionRate ‘average’ improvements of 20% (dwellings)and 23% to 28% (buildings other than dwellings):

England and Wales

As specified in Approved Documents L1A and L2Arespectively

Northern Ireland

As specified in Technical Booklets F1 and F2.

3.3 The product can maintain, or contribute tomaintaining, continuity of thermal insulation atjunctions between the wall and other building

elements. Guidance in this respect, and on limitingheat loss by air infiltration, can be found inEngland and WalesLimiting thermal bridging and air leakage : Robustconstruction details for dwellings and similarbuildings TSO 2002Northern IrelandAccedited Construction Details (version 1.0).

3.4 Compliance with the guidance referred toin section 3.3 will allow the use of the default psivalues from Table 3 of BRE Information PaperIP 1/06 Assessing the effects of thermal bridgingat junctions and around openings and Table K1 ofThe Government’s Standard Assessment Procedurefor Energy Rating of Dwellings (SAP 2005), inTarget Emission Rate calculations to SAP 2005 orthe Simplified Building Energy Model (SBEM).3.5 When installed in the wall of existingbuildings, the product can meet, or contribute tomeet, the relevant requirements of the followingguidance documents:England and WalesApproved Document L1B, section 2, L2B, section 3Northern IrelandAs specified in Technical Booklets F1 and F2,section 3.

3.6 Subject to the selection of anappropriate insulation thickness, walls cansatisfy the Elemental Target U value of

0.30 Wm–2K–1 specified in Table 1 to clause6.2.1 of the Technical Handbooks.

3.7 The product can maintain, or contribute tomaintaining, continuity of thermal insulation atjunctions between the wall and other buildingelements. Guidance in BRE report (BR 262 : 2002)Thermal insulation : avoiding risks is acceptable.


4.1 Walls and ceilings incorporating theproduct will adequately limit the risk ofinterstitial condensation when they are

designed and constructed in accordance withBS 5250 : 2002, Section 8 and Appendix D.

2

Table1 U value (Wm–2K–1) of wall construction

Cavity wall construction(1)(2)

Insulation Without Dense concrete Medium concrete Aerated concretethickness cavity block block block(mm) (� = 1.13 Wm–1K–1) (� = 0.32 Wm–1K–1) (� = 0.12 Wm–1K–1)

d = 1800 Kgm–3 d = 1300 Kgm–3 d = 400 Kgm–3

70 0.30 0.30 0.28 0.26

80 0.27 0.27 0.26 0.23(1) Assuming Gypsum plasterboard thickness 12.5 mm (� = 0.21 Wm–1K–1) as per BRE Report 443.

(2) Assuming air cavity to have a resistance of 0.18 m2KW–1 as per BRE Report 443.

4.2 The boards have a nominal water vapourresistivity exceeding 250 MNsgm–1 and providedall joints between boards are taped in accordancewith the Certificate holder’s literature can offer asignificant resistance to water vapour transmission.When using the boards as vapour control layer,consideration must be taken of the overall installationto minimise and seal perforations by services.

Surface condensation4.3 Walls and ceilings will adequately limitthe risk of surface condensation when thethermal transmittance (U value) does not

exceed 0.7 Wm–2K–1 and 0.35 Wm–2K–1

respectively at any point and the junctions withother elements are designed in accordance withthe relevant requirements of TSO publicationLimiting thermal bridging and air leakage : Robustconstruction details for dwellings and similarbuildings TSO 2002 or BRE Information PaperIP 01/06.

4.4 Walls and ceilings will adequately limitthe risk of surface condensation when thethermal transmittance (U value) does not

exceed 1.2 Wm–2K–1 at any point. Guidance maybe obtained from Section 8 of BS 5250 : 2002and BRE report (BR 262 : 2002).

4.5 As with other types of insulation applied to theinside of a wall, there may be a risk of coldbridging from the floors or ceilings, particularly inconcrete slab construction. It has beendemonstrated that use of coving at the wall ceilingjoint will significantly reduce this risk.

4.6 Dry lining has been used successfully in therehabilitation of buildings suffering from surfacecondensation of walls where the dampness hasbeen caused by the lack of thermal insulation.

5 InfestationThe use of the system does not in itself promoteinfestation. The creation of voids within the structure,ie gaps between the wall lining and the boards,may provide habitation for insects or vermin inareas already infested. Care should be taken toensure, wherever possible, that all voids are sealed,as any infestation may be difficult to eradicate.There is no food value in the materials used.

6 Behaviour in relation to fire

6.1 The boards have a Class 1 inaccordance with BS 476-7 : 1997.

6.2 When properly installed, the insulation will becontained between the wall and internal liningboard until one is destroyed. Therefore, theinsulation will not contribute to the development ofa fire or present a smoke or toxic hazard as the firedevelops.

6.3 Recessed lighting must not be used in ceilingswith this form of insulation.

7 Water penetration7.1 The board’s insulation component closed cellstructure does not allow water uptake by capillaryaction.

7.2 The boards insulation component presents nosignificant risk of water penetration.

8 Impact resistanceImpact damage would be no greater than wouldbe expected from the internal lining alone.

9 Wall-mounted fittingsThe recommendations of the Certificate holdershould be followed. Any object fixed to the wall,other than lightweight items, eg framed pictures,should be fixed through the lining board, timberbattens and insulation into the wall behind, usingrecommended proprietary fixings. Ceiling fixtureswill require longer screws to secure them to thestructure.

10 Durability

The boards are rot-proof, dimensionallystable and durable. Provided they are usedin accordance with the Certificate holder’s

instructions, and are fixed to satisfactory stable anddurable backgrounds should have a life equal tothat of the building in which they are installed.Under normal conditions of occupancy, the walllining is unlikely to suffer damage, but if damagedoes occur repairs can be carried out.

3

Installation

11 General11.1 Ballytherm BTDL Dry Lining Board Insulationis for installation on internal walls and ceilings. Atypical method is shown in Figure 1.

Figure 1 Ballytherm BTDL Dry Lining, mechanicallyfixed

11.2 Installation should be in accordance withgood dry lining practice and the relevant parts ofthe Certificate holder’s literature.

11.3 The boards can be cut using a sharp knifeor fine-toothed saw, to fit around windows, doors,air bricks. It is essential that cut pieces completelyfill the spaces for which they are intended and areadequately secured.

11.4 All installations of insulated dry lining requirecareful planning and setting out.

11.5 Before fixing the product, sufficient time mustbe allowed for damp-proofing treatments, whereapplied, to dry out (see also, BS 6576 : 2005 fordry lining in conjunction with a chemical dpcapplication).

12 Procedure12.1 The wall is surveyed to establish its flatnessand suitability for receiving the system (seesection 2.4). This system may be used on anystable, dry walls capable of taking the fixings forthe timber battens.

12.2 In existing walls, the wall surface isprepared to a smooth finish. Wallpaper, skirting,

picture rails, gloss paint and projecting windowboards are all removed.

12.3 The insulation boards are cut to fit andplaced against the wall. Joints and perforations aresealed with aluminium tape. Pre-treated timberbattens are mechanically fixed horizontally throughthe top, centre and bottom of the insulation into thewall substrate.

12.4 The battens must be of sufficient thickness(minimum 25 mm) and spacing (at maximum600 mm centres) to provide adequate support towhich the lining board can be fixed, and providefor any services that are to be incorporated into thevoid between the insulation board and liningboard. Vertical battens are then fitted. Additionalbattens can be used around openings and tosupport heavy horizontal items.

12.5 To avoid thermal bridging, the boardsshould be used to line window reveals and aroundthe perimeter of separating floors.

12.6 Jointing and finishing of the plasterboardlining is carried out in the appropriate manner.Timber skirting can be fixed into the horizontalbatten at floor level.

Technical Investigations

The following is a summary of the technicalinvestigations carried out on Ballytherm BTDL DryLining Board Insulation.

13 TestsTests were carried out in accordance withEN 13165 : 2001 to determine:• thermal conductivity (� value).

14 InvestigationsAn examination was made of test data toEN 13165 : 2001 relating to:• squareness• density• dimensions• vapour resistance• flatness• � value.

15 Other investigations

A theoretical analysis of the hygrothermalbehaviour of various installations was carried out.

battens

plasterboard

aluminiumjoint tape

Ballytherm BTDL

4

Bibliography

BS 476-7 : 1997 Fire tests on building materialsand structures — Method of test to determine theclassification of the surface spread of flame ofproducts


BS 5628-3 : 2005 Code of practice for the use ofmasonry — Materials and components, design andworkmanship

BS 6576 : 2005 Code of practice for diagnosisof rising damp in walls of buildings and installationof chemical damp-proof courses

BS 8000-3 : 2001 Workmanship on buildingsites — Code of practice for masonry

BS EN 520 : 2004 Gypsum plasterboards —Definitions, requirements and test methods



5



6

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7

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1 Description1.1 Ballytherm BTR (Pitched Roof Insulation)comprises a rigid polyisocyanurate closed cell,rigid foam core, sandwiched with low emissivity,composite aluminium foil facings on both sides. Thefoam is CFC and HCFC free and has zero ozonedepletion potential (Zero ODP).

1.2 The boards are available in nominalcharacteristics(1) of:length (mm) 2400width (mm) 1200thickness (mm)(1) 25 to 75compressive strength (kNm–2) �70density (kgm–3) 35 to 45(1) Other sizes may be available to special order.


1.4 The boards are installed in conjunction withan appropriate internal lining board, for exampleBallytherm BTDL dry lining board (with λ =0.026 Wm–1K–1). See Detail Sheet 3.

1.5 Ancillary products used with the boards are:• roof tile underlay — fully-supported vapour

permeable • aluminium foil self-adhesive tape• sarking clips• stainless steel fixings

• galvanized slab nails or ring-shank nails• pre-treated battens and tiling laths• roofing slates or tiles• sealant.

Design Data

2 General2.1 Ballytherm BTR (Pitched Roof Insulation) boardwill improve the thermal insulation of new andexisting pitched roofs and is satisfactory for usebetween, and or below roof rafters in conjunctionwith internal lining board, vapour permeable rooftile underlay, timber counter battens and tilingbattens in tiled or slated, pitched roofs, designedand constructed in accordance with the relevantclauses of BS 5534 : 2003 for dwellings or otherbuildings with similar temperature and humidityconditions.

2.2 The boards are for use in pitched roofs wherethe ceiling follows the pitch of the roof andencloses a habitable space, or where the ceiling ishorizontal and encloses a loft space.

2.3 Lateral restraint to roof members and overallroof stability should be provided by a suitablebracing system, ie no contribution from theinsulation in this regard should be assumed.

2.4 During installation, care should be exercisedto ensure that the insulation boards are notsubjected to any construction, or foot traffic loads.Roof timbers of adequate strength should be usedto support such loads.

• THIS DETAIL SHEET RELATES TO BALLYTHERM BTR (PITCHED ROOFINSULATION).• The product is for use as thermal insulation between or between andbelow rafters in tiled or slated pitched roofs designed and constructed inaccordance with the relevant clauses of BS 5534 : 2003.• The product is for use where the ceiling follows the pitch of the roof andencloses a habitable space, or where the ceiling is horizontal andencloses a loft space.• The product must be used in conjunction with a suitable water vapourpermeable roof tile underlay.




BALLYTHERM BTR (PITCHED ROOFINSULATION)

Product

CI/SfB

(27.9) Rn7 (M2)

2.5 It is essential that detailing and jointing of theboards achieves a convection-free envelope ofhigh vapour resistance (see section 7.2). Any gapsshould be filled, and/or taped. Ridges, abutmentsand penetrations should also be sealed. Flue pipespassing through the insulation should be suitablysleeved.

2.6 Moisture entering the roof can be minimisedusing a minimum of 125 µm polyethylene, withsealed vapour control layer gaps placed under theinclined ceiling between the insulation and theinternal finish.

3 StrengthThe boards, when installed in accordance with theCertificate holder’s instructions, will resist the loadslikely to be met during installation and in service,(see sections 2.4 and 11.2).

4 Structural stability4.1 Wind uplift will depend largely on thebuilding geometry and its geographical locationand should be calculated in accordance withBS 6399-2 : 1997. Snow loadings should becalculated in accordance with BS 6399-3 : 1988.

4.2 When calculating the fixing spacing requiredto resist the calculated loadings the requirements ofBS 5268-2 : 2002 should be followed wherepossible. When using proprietary fixings andimproved nails, the Certificate holder can adviseon the correct type and fixing capacity inaccordance with BS 5268-2 : 2002.

5 Behaviour in relation to fire5.1 The boards have a Class 1 spread offlame in accordance with BS 476-7 : 1997.

5.2 The boards must not be carried over junctionsbetween roofs and walls required to provide aminimum period of fire resistance. The continuity offire resistance must be maintained, for example asdescribed in:

England and WalesApproved Document B, paragraphs 9.28 to 9.31


Northern IrelandTechnical Booklet E, paragraph 3.15.

5.3 The use of the boards will not affect the ratingobtained by tiled or slated roofs when assessed ortested to BS 476-3 : 1958.

5.4 When installed with an internal lining board,eg 12.5 mm thick plasterboard, the insulation willbe contained between the roof and internal liningboard until one is destroyed. Therefore, theinsulation will not contribute to the development of

a fire or present a smoke or toxic hazard as the firedevelops.

5.5 Recessed lighting must not be used in ceilingswith this form of insulation.

6 Thermal performance6.1 Calculations of the thermal transmittance(U value), a specific roof construction should becarried out in accordance with BS EN ISO 6946 :1997 and BRE report (BR 443 : 2006)Conventions for U-value calculations, using thedeclared thermal conductivity (� 90/90 value) of0.022 Wm–1K–1. Examples U values are given inTable 1.

Table 1 Warm pitched roof with insulation betweenand below rafters

Insulation thickness U value (Wm–2K–1) with different thicknesses forof bridged layer the continuous layer of insulation (mm)

(mm) 25 50 75

25 0.37 0.26 0.20

50 0.28 0.21 0.17

70 0.23 0.18 0.15

75 0.22 0.18 0.15

Notes

• Assuming plasterboard thickness 12.5 mm and � = 0.21 Wm–1K–1.

• Assuming the resistance of the unvented low emissivity air space to be0.34 m2KW–1 and forming a second bridged layer the timber rafter.

• Assuming the continuous layer to be the BTR insulation with� = 0.022 Wm–1K–1.

6.2 Subject to the selection of anappropriate board thickness, a roofconstruction can achieve the U value of

0.16 Wm–2K–1 specified for the ‘notional’ buildingin Table R1 of Appendix R of The Government’sStandard Assessment Procedure for Energy Ratingof Dwellings (SAP 2005) or the Simplified BuildingEnergy Model (SBEM) (see Table 1).

6.3 However, where the selected insulationthicknesses cannot achieve the U value as detailedin section 6.2, (see Table 1) the product canachieve the following:• the limit average U value of 0.25 Wm–2K–1

• the limit U value of 0.35 Wm–2K–1 for theindividual element.

6.4 For U values such as those shown in Table 1,additional energy saving measures will be requiredwithin the building envelope and/or services for abuilding to achieve the required overall carbondioxide emission rate reduction of ‘average’improvements of 20% (dwellings) and from 23% to28% (buildings other than dwellings):

England and WalesAs specified in Approved Documents L1A and L2A

Northern IrelandAs specified in Technical Booklet F1.

2

6.5 The product can maintain, or contribute tomaintaining, continuity of thermal insulation atjunctions between the roof and other buildingelements. Guidance in this respect, and on limitingheat loss by air infiltration, can be found in England and WalesLimiting thermal bridging and air leakage : Robustconstruction details for dwellings and similarbuildings TSO 2002Northern IrelandAccedited Construction Details (version 1.0).

6.6 Compliance with the guidance referred toin section 6.5 will allow the use of the default psivalues from Table 3 of BRE Information PaperIP 1/06 Assessing the effects of thermal bridgingat junctions and around openings and Table K1 ofThe Government’s Standard Assessment Procedurefor Energy Rating of Dwellings (SAP 2005), inTarget Emission Rate calculations to SAP 2005 orthe Simplified Building Energy Model (SBEM).

6.7 When installed in the roof of existingbuildings, the product can meet, or contribute tomeet, the relevant requirements of the followingguidance documents:England and WalesApproved Document L1B, section 2, L2B, section 3Northern IrelandAs specified in Technical Booklets F1 and F2,section 3.

6.8 Subject to the selection of anappropriate insulation thickness and installedbetween rafters, a roof can satisfy the

Elemental target U value of 0.25 Wm–2K–1

specified in Table 1 to clause 6.2.1 of theTechnical Handbooks.

6.9 The product can maintain, or contribute tomaintaining, continuity of thermal insulation atjunctions between roof and other buildingelements. Guidance in BRE report (BR 262 :2002) Thermal insulation : avoiding risks isacceptable.


7.1 Roofs will adequately limit the risk ofinterstitial condensation when they aredesigned and constructed in accordance

with BS 5250 : 2002, Section 8.4 andAppendix D.

7.2 The boards have a water vapour resistivityexceeding 250 MNsg–1m–1, and when installedwith tightly-butted and taped joints, in a continuouslayer can provide a convection-free envelope ofhigh vapour resistance. In these circumstances, orwhere a vapour control layer is used, a suitablevapour permeable roof tile underlay may be laidover the insulation boards without a ventilated airspace. Where high vapour resistance roof tileunderlays are used, ventilation to the air spaceshould be considered in accordance with therecommendations of BS 5250 : 2002 or relevantBBA Certificate for the roof tile underlay.

7.3 The risk of interstitial condensation is greatestwhen the building is drying out after construction.Guidance on preventing condensation from thisand other sources is given in BRE Digest 369Interstitial condensation and fabric degradationand BRE report (BR 262) : 2002.

Surface condensation7.5 Roofs will adequately limit the risk ofsurface condensation when the thermaltransmittance (U value) does not exceed

0.35 Wm–2K–1 at any point and the junctions withwalls are designed in accordance with the relevantrequirements of TSO publication Limiting thermalbridging and air leakage : Robust constructiondetails for dwellings and similar buildings, 2002 orBRE Information Paper IP 1/06.

7.6 Roofs will adequately limit the risk ofsurface condensation when the thermaltransmittance (U value) does not exceed

1.2 Wm–2K–1 at any point. Guidance may beobtained from Section 8 of BS 5250 : 2002 andBRE report (BR 262 : 2002).

8 Resistance to moistureThe boards will not be adversely affected by rainshowers during installation, nor by wind-drivensnow or rain penetrating the tiling in service. Waterabsorption is low and its influence on the � value isminimal.

9 Maintenance and repairDamaged boards can be replaced prior to theinstallation of counter battens.

10 DurabilityThe boards are rot-proof, dimensionallystable, and when installed as specified, willhave a life equivalent to that of the roof

structure in which they are incorporated.

3

Installation

11 General11.1 Installation of Ballytherm BTR (Pitched RoofInsulation) must be in accordance with the relevantClauses of BS 5534 : 2003 and the Certificateholder’s instructions, and can be carried out in allconditions normal to roof work. Typical methodsare shown in Figure 1.

Figure 1 Ballytherm BTDL Dry Lining, mechanicallyfixed

11.2 The boards are light to handle but somehandling difficulties may be experienced in windyconditions. Once laid the boards will not supportthe weight of operatives, appropriate care must betaken during installation and tiling in accordance toWork at Height Regulations : 2004.

11.3 The boards can be cut using a sharp knifeor fine-toothed saw but care must be taken toprevent damage particularly to edges. Damagedboards should not be used. Small areas ofdamaged facer may be repaired with self-adhesivealuminium foil tape.

11.4 It is important to ensure a tight fit betweenthe boards and rafters, boards at the ridge androof/wall junctions

11.5 Gaps and joints in the insulation envelope(see section 2.5) should be filled/sealed withflexible sealant or expanding foam.

11.6 When applying roof tiles or slates to a warmroof construction, the recommendations of thetile/slate manufacturer should be followed.

12 ProcedureBetween and under rafter insulation

12.1 The boards are cut to fit tightly betweenrafters flush with the bottom and retained to ensurea 50 mm ventilation gap (if required) between theroof tile underlay and the boards using stop beador timber battens fixed to the side of the rafters.

12.2 The second layer of boards are fixed flush,across the underside of the rafters using broadhead clout nails. All board joints are sealed usingmetallized tape.

12.3 The internal finish is fixed through theinsulation to the rafters.

12.4 Where the rafter depth cannotaccommodate the required thickness of insulation50 mm by 50 mm timber battens can be attachedto the underside of the rafter to increase theavailable depth.

12.5 Where the insulation thickness makessecuring of the internal lining panels impractical,timber battens 25 mm deep may be nailed throughto the rafters and the panels secured to the battens.

Finishing

12.6 Counter battens are fixed through theinsulation into the rafters at approximate centres.Tiling battens and roof tiles or slates are installed inaccordance with the relevant clauses of BS 5534 :2003. The batten space must be adequatelyvented.

12.7 The vapour control layer and internal liningboards appropriate to the application and requireddecoration are applied.

Ballytherm BTR(between rafter)

roof tile underlay

Ballytherm BTR(below rafter)

4

Technical InvestigationsThe following is a summary of the technicalinvestigations carried out on Ballytherm BTR(Pitched Roof Insulation).

13 TestsTests were carried out in accordance withEN 13165 : 2001 to determine:• dimensional stability at specified temperature

and humidity conditions• flatness under one-sided wetting• thermal conductivity (� value)• deformation under elevated temperature and

specified compressive load• long-term water absorption by total immersion• compressive strength.

14 InvestigationsAn examination was made of test data toEN 13165 : 2001 relating to:• dimensions• squareness• � value• vapour resistance• density• diffusion light property of facings.

15 Other investigationsA theoretical analysis of the hygrothermalbehaviour of various installations was carried out.

5

Bibliography

BS 476-3 : 1958 Fire tests on building materialsand structures — External fire exposure roof testBS 476-7 : 1997 Fire tests on building materialsand structures — Method of test to determine theclassification of the surface spread of flame ofproducts


BS 5268-2 : 2002 Structural use of timber —Code of practice for permissible stress design,materials and workmanship

BS 5534 : 2003 Code of practice for slating andtiling (including shingles)

BS 6399-2 : 1997 Loading for buildings — Codeof practice for wind loadsBS 6399-3 : 1988 Loading for buildings — Codeof practice for imposed roof loads



6



7

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Readers are advised to check the validity of this Certificate by either referring to the BBA’s website (www.bbacerts.co.uk) or contactingthe BBA direct (Telephone Hotline 01923 665400).

1 The Building Regulations 2000 (as amended) (England and Wales)The Secretary of State has agreed with the British Board of Agrément theaspects of performance to be used by the BBA in assessing the complianceof cavity wall insulation with the Building Regulations. In the opinion of the

BBA, Ballytherm BTCW Tongue-and-Groove Cavity Wall Insulation, if used inaccordance with the provisions of this Certificate, will meet or contribute to meetingthe relevant requirements.Requirement: B3(4) Internal fire spread (structure)

Comment: Walls incorporating the product can meet this Requirement. Seesections 8.2 to 8.4 of this Certificate.

Requirement: C2(a)(b)(c) Resistance to moisture

Comment: Walls incorporating the product can meet this Requirement. Seesections 7.2, 7.7, 10.2, 12.1 and 12.3 of this Certificate. Inaddition the product may be used where it bridges the dpc ineither leaf. See section 10.1 of this Certificate.

Requirement: L1(a)(i) Conservation of fuel and powerComment: Walls incorporating the product can contribute to a building

meeting this Requirement. See sections 11.2 to 11.5 of thisCertificate.

Requirement: Regulation 7 Materials and workmanship

Comment: The product is an acceptable material. See section 13 of thisCertificate.

Ballytherm LtdAnnagh Industrial ParkBallyconnellCo CavanIrelandTel: 00 353 49 9527000 Fax: 00 353 49 9527002e-mail: [email protected]: www.ballytherm.ie

AgrémentCertificate

No 07/4422

Designated by Governmentto issue

European TechnicalApprovals

BALLYTHERM BTCW TONGUE-AND-GROOVECAVITY WALL INSULATIONIsolant pour murs creuxKerndämmung

Product

Regulations• THIS CERTIFICATE OFCONFIRMATION RELATES TOBALLYTHERM BTCW TONGUE-AND-GROOVE CAVITY WALLINSULATION, A RIGIDPOLYISOCYANURATE FOAMBOARD WITH FOIL FACINGSFOR PARTIAL FILL CAVITYWALLS.• The product is for use in newbuildings up to and including12 m in height, subject to theconditions contained in theDesign Data part of thisCertificate.• The product is installed duringconstruction and is for use as apartial fill board to reduce thethermal transmittance of newcavity walls with masonry innerand outer leaves.

CI/SfB

(21.9) Rn7

continued

2

2 The Building (Scotland) Regulations 2004In the opinion of the BBA, Ballytherm BTCW Tongue-and-Groove CavityWall Insulation, if used in accordance with the provisions of this Certificate,will satisfy or contribute to satisfying the various Regulations and related

Mandatory Standards as listed below.Regulation: 8 Fitness and durability of materials and workmanshipRegulation: 8(1) Fitness and durability of materials and workmanship

Comment: The product can contribute to a construction meeting thisRegulation. See section 13 and the Installation part of thisCertificate.

Regulation: 9 Building standards — constructionStandard: 2.4 Cavities

Comment: Wall cavities incorporating the product must comply with thisStandard, with reference to clauses 2.4.1(1), 2.4.2(1), 2.4.7(1)

and 2.4.9(2). See section 8.4 of this Certificate.Standard: 3.4 Moisture from the ground

Comment: The product does not absorb water by capillary action and,therefore, may be used where it bridges the dpc of either leaf,with reference to clause 3.4.5(1)(2) to this Standard. See sections10.1 and 10.2 of this Certificate.

Standard: 3.10 PrecipitationComment: Walls incorporating the product can satisfy this Standard, with

reference to clause 3.10.3(1)(2), provided they comply withsections 7.2, 7.4, 7.7 and 10.2 of this Certificate.

Standard: 3.15 CondensationComment: The product can contribute to satisfying this Standard, with

reference to clauses 3.15.1(1), 3.15.3(1) and 3.15.4(1). Seesections 12.2 and 12.3 of this Certificate.

Standard: 6.2 Building insulation envelopeComment: The product will enable a wall to satisfy or contribute to satisfying

the requirements of this Standard, with reference to clauses6.2.1(1)(2) (Table 1), 6.2.4(1)(2) and 6.2.5(1)(2). See sections 11.6and 11.7 of this Certificate.(1) Technical Handbook (Domestic).(2) Technical Handbook (Non-Domestic).

3 The Building Regulations (Northern Ireland) 2000 (as amended)In the opinion of the BBA, Ballytherm BTCW Tongue-and-Groove CavityWall Insulation, if used in accordance with the provisions of this Certificate,will satisfy or contribute to satisfying the various Building Regulations as

listed below.Regulation: B2 Fitness of materials and workmanship

Comment: The product is an acceptable material. See section 13 of thisCertificate.

Regulation: C4 Resistance to ground moisture and weather

Comment: Walls incorporating the product can satisfy this Regulation. Seesections 7.2, 7.7 and 10.2 of this Certificate. In addition theproduct may be used where it bridges the dpc in either leaf. Seesection 10.1 of this Certificate.

Regulation: C5 Condensation

Comment: A wall incorporating the boards can satisfy this Regulation. Seesection 12.3 of this Certificate.

Regulation: E3 Internal fire spread — Structure

Comment: Walls incorporating the product can satisfy this Regulation. Seesections 8.2 to 8.4 of this Certificate.

Regulation: F2(a)(i) Conservation measuresComment: Walls incorporating the product can satisfy or contribute to

satisfying this Regulation. See section 11.2 to 11.5 of thisCertificate.

continued

4 Construction (Design and Management) Regulations 1994 (as amended)Construction (Design and Management) Regulations (Northern Ireland) 1995(as amended)

Information in this Certificate may assist the client, planning supervisor, designerand contractors to address their obligations under these Regulations.See section: 6 Delivery and site handling (6.4).

• It is essential that the walls arebuilt in accordance with theconditions set out in the DesignData and Installation parts of thisCertificate.Confirmation of Agrément CertificateNo 05/0220, Detail Sheet 2, issuedby the Irish Agrément Board, (IAB),EOLAS, Glasnevin, Dublin 9, Ireland.

Technical Specification5 Description5.1 Ballytherm BTCW Cavity Wall Insulation is apartial fill, cavity wall board with a tongue-and-grooveedge and comprises a closed cell rigid polyisocyanuratefoam core, sandwiched with aluminium foil facings onboth sides. The foam is CFC and HCFC free and haszero ozone depletion potential (Zero ODP). The nominalcharacteristics are:

length (mm) 2400width (mm) 450thickness (mm)(1) 25 to 75density (kgm–3) 30 to 33edge profile tongue-and-groove

(1) Other sizes available subject to quantity.

5.2 The board is manufactured in accordance withEN 13165 : 2001, Section 4.2 and the relevant partsof Section 4.3.

5.3 Only BBA-approved insulation retaining fixings andcompatible wall ties should be used with the boards.

5.4 Cavity wall ties in accordance with BS DD 140-2 :1987 or BS EN 845-1 : 2003 and BS 5628-3 :2005, approved by the BBA, are suitable.

5.5 Where the overall cavity width exceeds 75 mm,additional vertical twist ties may be required for structuralstability in accordance with BS 5628-3 : 2005 (seesection 15 of this Certificate).

6 Delivery and site handling6.1 The boards are delivered to site in polyethyleneshrink-wrapped packs containing a label bearing themanufacturer’s trade name, product description andcharacteristics, and the BBA identification markincorporating the number of this Certificate.

6.2 Care must be taken to avoid damaging cornersand edges.

6.3 The boards must be protected from prolongedexposure to sunlight and should be stored either undercover or protected with opaque polythene sheeting.Where possible, packs should be stored inside. If storedoutside, the products should be stacked flat and raisedabove ground level, and not in contact with groundmoisture.

6.4 The boards must not be exposed to open flame orother ignition sources.

Design Data7 General7.1 Ballytherm BTCW Tongue-and-Groove Cavity WallInsulation is effective in reducing the U value (thermaltransmittance) of new external cavity walls with masonryinner and outer leaves (masonry includes clay andcalcium silicate bricks, concrete blocks, natural andreconstituted stone blocks). It is essential that such wallsare designed and constructed to incorporate the normalprecautions to prevent moisture penetration.

7.2 Buildings subject to national BuildingRegulations should be constructed in accordancewith the relevant recommendations of:

• BS 5628-3 : 2005. In particular, Clause 5.5 of theCode of Practice Exclusion of water should befollowed in that the designer should select aconstruction appropriate to the local wind-driven rainindex, paying due regard to the design detailing,workmanship and materials to be used(1)

• BS 8000-3 : 2001.

(1) The construction and detailing should comply with goodpractice as described in BBA joint publication CavityInsulation of Masonry Walls — Dampness Risks and How toMinimise them. They are particularly important in areassubject to severe driving rain.

7.3 Other buildings not subject to these Regulationsshould also be built in accordance with the Standardsgiven in 7.2.

7.4 The product is for use in any exposure zonein buildings up to 12 m in height, subject to theconditions of this Certificate and sections 7.2

and 7.8 being met. However, the use of the productdoes not preclude the need to apply any external rendercoat or other suitable finish in severe exposure zoneswhere such application would be normal practice.

7.5 The use of cavity battens and/or boards duringconstruction is strongly recommended to preventbridging by mortar droppings.7.6 As with any other form of cavity wall insulation,where buildings need to comply with NHBC Standardsor Zurich Building Guarantee Technical Manualspecifiers should observe the requirements of theseStandards.

7.7 It is recommended that installation is carriedout to the highest level on each wall or that thetop edge of the installation is protected by a

cavity tray.

Buildings up to and including 12 m high7.8 The minimum residual cavity width to bemaintained during construction must be 25 mm. Toachieve this requirement a greater nominal residualcavity width may need to be specified at the designstage to allow for inaccuracies inherent in the buildingprocess. The specifier may either:• design a cavity width by consideration of the

dimensional tolerances of the components whichmake up the wall by reference to the BritishStandards relating to the bricks, blocks and insulationboards, or use the data from their respectivemanufacturers. In addition, allowance may need tobe made for the quality of available buildingoperatives and the degree of site supervision orcontrol available, or

• design a nominal residual cavity width of 50 mm (aresidual cavity nominally 50 mm wide will berequired by the NHBC, where normal standards oftolerance and workmanship are adopted).

7.9 The size of residual cavity obtained in theprocesses described in section 7.8 is also subject to thefollowing limitations in respect of exposure of theproposed building as set out in Table 1.

3

Table 1 Maximum allowable total exposure factorsof different constructions (1)

Construction Maximum allowableexposure factor E (1)

All external masonry walls protected byrendering (to BS EN 13914-1 : 2005)tile hanging no restrictionslate hangingtimber, plastic or metal weatherboarding or cladding

}One or more external masonry walls constructed 100from facing clay brickwork or natural stone, theporosity of which exceeds 20% by volume.Mortar joints must be flush pointed or weatherstruck

One or more external masonry walls constructed 88from calcium silicate bricks, concrete blocks,reconstituted stone or natural stone, the porosity ofwhich is less than 20% by volume, or any materialwith raked mortar joints

(1) Based upon the approach in BS 5618 : 1985.

8 Behaviour in relation to fire8.1 The product achieved a Class 1 surface spread offlame rating when tested to BS 476-7 : 1997. The useof the boards does not prejudice the fire resistanceproperties of the wall. They are unlikely to becomeignited within the cavity when used in the context of thisCertificate. If fire does penetrate into an unventilatedcavity, the amount of air present will be insufficient tosupport combustion, and flame spread will be minimal.

8.2 The requirements of the Building Regulationsrelating to fire spread in cavity walls, can be metin buildings of all purpose groups without the

need for cavity barriers, provided the constructioncomplies with the provisions detailed in:

England and WalesApproved Document B, Diagram 32Northern IrelandTechnical Booklet E, Diagram 3.5.8.3 A summary of these provisions is given here:England and Wales and Northern Ireland(1) The wall must consist of masonry inner and outerleaves, each at least 75 mm thick.(2) The cavity must not be more than 300 mm wide(Northern Ireland only).(3) The cavity must be closed at the top of the wall andat the top of any opening.(4) In addition to the insulation only the followingshould be placed in, or exposed to, the cavity:• timber lintels, window or door frames, or end of

timber joists• pipe, conduit or cables• dpc, flashing, cavity closer or wall tie• domestic meter cupboard, provided there are not

more than two cupboards to a dwelling, the openingin the outer leaf is not more than 800 mm by500 mm for each cupboard, and the inner leaf is notpenetrated except by a sleeve not more than 80 mmby 80 mm, which is fire-stopped.

8.4 For constructions not covered bysections 8.2 and 8.3, cavity barriers must beprovided to comply with:

England and WalesApproved Document B, Section 10ScotlandMandatory Standard 2.4, clauses 2.4.1(1), 2.4.2(1),2.4.7(1) and 2.4.9(2)

(1) Technical Handbook (Domestic).(2) Technical Handbook (Non-Domestic).

Northern IrelandTechnical Booklet E, paragraphs 3.35 to 3.38.

9 Proximity of flues and appliancesWhen installing the product in close proximity to certainflue pipes and/or heat-producing appliances, thefollowing provisions to the national Building Regulationsare acceptable:England and WalesApproved Document JScotlandMandatory Standard 3.19Northern IrelandTechnical Booklet L.

10 Liquid water penetration10.1 When the product is used in situationswhere it bridges the dpc in walls, dampness fromthe ground will not pass through to the inner leaf

provided the cavity wall is detailed in accordance withthe requirements and provisions of the national BuildingRegulations:

England and WalesApproved Document C2(a)ScotlandMandatory Standard 3.4, clause 3.4.5(1)(2)


Northern IrelandTechnical Booklet C, Section 1.6.10.2 Constructions incorporating the product and builtin accordance with BS 5628-3 : 2005, will resist thetransfer of precipitation to the inner leaf and satisfy thenational Building Regulations:England and WalesApproved Document C2(b)ScotlandMandatory Standard 3.10, clause 3.10.3(1)(2)


Northern IrelandTechnical Booklet C, Section 2.

10.3 In all situations and to prevent bridging of thecavity, it is particularly important to ensure duringinstallation that:• the dpc should not project into cavity at ground-floor

level as it can lead to catching mortar droppings• wall ties and fixings are installed correctly and are

thoroughly clean• excess mortar is cleaned from the cavity face of the

leading leaf and any debris removed from the cavity• mortar droppings are cleaned from the exposed

edges of installed boards• boards are properly installed and butt jointed

4

• at lintel level, a cavity tray, stop ends and weepholesmust be provided

• installation is carried out to the highest level on eachwall or the top edge of the insulation is protected bya cavity tray.

11 Thermal performance11.1 Calculations of the thermal transmittance (U value)of a specific wall construction should be carried out inaccordance with BS EN ISO 6946 : 1997 andBRE report (BR 443 : 2006) Conventions for U-valuecalculations, using the declared (� 90/90 value) thermalconductivity of 0.022 Wm–1K–1 for the insulation. TheU value of a typical wall construction will depend on thecavity width and the insulating value of the internal blockleaf and finish. Example U values are given in Table 1.

11.2 Subject to the selection of an appropriateinsulation thickness walls can improve on theU value of 0.35 Wm–2K–1 as specified in the

‘notional’ building in Table R1 of Appendix R of TheGovernment’s Standard Assessment Procedure forEnergy Rating of Dwellings (SAP 2005) or the SimplifiedBuilding Energy Model (SBEM), see Table 1. Theproduct therefore can contribute to enabling a buildingto meet the Target Emission Rate ‘average’ improvementsof 20% (dwellings) and 23 to 28% (buildings other thandwellings):

England and WalesAs specified in Approved Documents L1A and L2A

Northern IrelandAs specified in Technical Booklets F1 and F2

11.3 The product can maintain, or contribute tomaintaining, continuity of thermal insulation at junctionsbetween the wall and other building elements.Guidance in this respect, and on limiting heat loss by airinfiltration, can be found in:England and WalesLimiting thermal bridging and air leakage: Robustconstruction details for dwellings and similar buildingsTSO 2002

Northern IrelandAccredited Construction Details (version 1.0).

11.4 Compliance with the guidance referred to insection 11.3 will allow the use of the default psi valuesfrom Table 3 of BRE Information Paper IP 1/06Assessing the effects of thermal bridging at junctions andaround openings and Table K1 of The Government’sStandard Assessment Procedure for Energy Rating ofDwellings, SAP 2005, in Target Emission Ratecalculations to SAP 2005 or the Simplified BuildingEnergy Model (SBEM).

11.5 When installed in walls of existing buildings, theproduct can meet, or contribute to meet, the relevantrequirements of the following guidance documents:

England and WalesAs specified in Approved Documents L1B, section 2 andL2B, section 3

Northern IrelandAs specified in technical Booklets F1 and F2, section 3

11.6 Subject to the selection of an appropriateinsulation thickness, wall can satisfy the Elementaltarget U value of 0.30 Wm–2K–1 specified in

Table 1 to clause 6.2.1 of the Technical Handbooks.

11.7 The product can maintain, or contribute tomaintaining, continuity of thermal insulation at junctionsbetween wall and other building elements. Guidance inBRE Report (BR 262: 2002) Thermal insulation :avoiding risks is acceptable.

12 CondensationSurface condensation

12.1 Walls will limit the risk of surfacecondensation adequately when the thermaltramittance (U value) does not exceed

0.7 Wm–2K–1 at any point, and the junctions with otherelements are designed in accordance with the relevantrequirements of the TSO publication (see section 11.3)or the BRE Information Paper IP 01/06.

12.2 Walls and ceilings will adequately limitthe risk of surface condensation when the thermaltransmittance (U value) does not exceed

1.2 Wm–2K–1 at any point. Guidance may be obtainedfrom Section 8 of BS 5250 : 2002 and BRE report(BR 262 : 2002).

Interstitial condensation12.3 Walls incorporating the product will limitthe risk of interstitial condensation adequatelywhen they are designed and constructed in

accordance with BS 5250 : 2002 (Section 8 andAnnex D).

12.4 The product has a nominal vapour resistivityexceeding 250 MNsg–1m–1 and, therefore, will provide asignificant resistance to the passage of water vapourtransmission. Joints between boards will facilitate thepassage of water vapour under normal conditions oftemperature and humidity.

12.5 If the product is to be used in the external walls ofrooms expected to have high humidities, care must betaken to provide adequate permanent ventilation toavoid possible problems from the formation of interstitialcondensation in the internal wall leaf.

5

Table 1 U value (Wm–2K–1) of partial filled cavity wall (1)(2)

Insulated Dense concrete block Medium concrete block Aerated concrete blockthickness (� = 1.13 Wm–1K–1) (� = 0.32 Wm–1K–1) (� = 0.12 Wm–1K–1)(mm) d = 1800 kgm–3 d = 1300 kgm–3 d = 400 kgm–3

25 0.50 0.46 0.3950 0.32 0.30 0.2470 0.25 0.24 0.2275 0.23 0.22 0.21

(1) Assuming dense plaster thickness 13 mm (� = 0.57 Wm–1K–1).

(2) Assuming the low emissivity-residual air cavity to have a resistance of 0.44 m2KW–1 as per BRE Report 443.

13 DurabilityThe product is rot-proof, dimensionally stable anddurable and will remain effective as an insulantfor the life of the building in which it is installed.

Installation14 GeneralIt is recommended that the inner leaf be constructedahead of the outer leaf, as the product fastened to thecavity face of the inner leaf give a slightly enhancedthermal performance. It is essential that the spacing ofwall ties/clips allows one long edge of each board tobe secured at a minimum of two points.

15 Procedure15.1 A section of the inner leaf is built with the first rowof wall ties, at approximately 600 mm horizontalspacing, where the insulation is to begin. It isrecommended that the wall ties are not placed directlyon the damp-proof course. The first run of boards maycommence below damp-proof course level to providesome edge insulation for the floor (see Figure 1).

Figure 1 Insulation installed below dpc level toprovide edge insulation for floor

15.2 The leading leaf is built up to the required height,with a second row of wall ties placed at a verticalheight of 450 mm ensuring the drip of the tie is locatedhalfway across the residual cavity width. Excess mortaris cleaned from the cavity face of the leading leaf, andthe boards are placed on the wall ties, behind theretaining clips, to form a closely jointed run.

15.3 The second row of wall ties is fitted to retain thetops of the boards. It is essential that all wall ties slopedownwards towards the outer leaf (see Figure 2) and at

centres not exceeding 900 mm to ensure that eachboard is secured at a minimum of three points.

Figure 2 Installation of wall ties

15.4 Additional ties may be required to satisfy thestructural requirements of BS 5628-3 : 2005 and/or toensure adequate retention of boards or cut pieces.15.5 The other leaf is then built up to the level of thetop of the boards.15.6 All boards should be interlocked with verticaljoints staggered. Insulation boards and wall ties shouldbe staggered as construction proceeds and carried upto the highest level of wall, except where protected by acavity tray (see section 7.7).15.7 After each section of the leading leaf is built,excess mortar should be removed from the cavity faceand mortar droppings cleaned from exposed edges ofthe installed board, before installation of the next run ofboards. Use of a cavity board will protect the installedboard edges or a cavity batten will help to keep thecavity clean as the following leaf is built (see Figures 3and 4).15.8 Where openings such as doors and windows arein close proximity, it is recommended that a continuouslintel or cavity tray is used. Individual lintels or cavitytrays should have stopends and be adequately drained.15.9 The boards can be cut, using a sharp knife orfine-toothed saw, to fit around windows, doors and airbricks. It is essential that cut pieces completely fill thespaces for which they are intended and are adequatelysecured. Gaps should not be left in the insulation.15.10 All building involving the boards, particularlywork which is interrupted, must conform to BS 5628-3 :2005, Sections A4.1.3.2, A4.1.3.9, A5.1.1.3 andA5.4.4.

first run commencesbelow dpc level, toprovide edge insulationfor floor

tongue uppermost

tongue cut awayto accommodate ties

6

Figure 3 Use of cavity batten

Figure 4 Use of cavity board

Technical InvestigationsThe following is a summary of the technicalinvestigations carried out on Ballytherm BTCW Tongue-and-Groove Cavity Wall Insulation.

16 Investigations16.1 The technical data in the Agrément issued by theIrish Agrément Board were evaluated in the context ofUK practice, conditions and building regulations.

16.2 An examination was made of test data toEN 13165 : 2001 relating to:• dimensions• squareness• density• flatness under one-sided wetting• thermal resistance• � value• compressive strength at 10% compression• dimensional stability at specified temperature and

humidity• behaviour in relation to fire• deformation under specified compressive load and

temperature conditions• diffusion tight property of foil facing.

16.3 A condensation risk analysis was performed.

BibliographyBS 476-7 : 1997 Fire tests on building materials andstructures — Method of test to determine theclassification of the surface spread of flame of products


BS 5618 : 1985 Code of practice for thermal insulationof cavity walls (with masonry or concrete inner and outerleaves) by filling with urea-formaldehyde (UF) foamsystems

BS 5628-3 : 2005 Code of practice for use of masonry— Materials and components, design and workmanship

BS 8000-3 : 2001 Workmanship on building sites —Code of practice for masonry

BS DD 140-2 : 1987 Wall ties — Recommendationsfor design of wall ties

BS EN 845-1 : 2003 Specification for ancillarycomponents for masonry — Ties, tension strips, hangersand brackets

BS EN 13914-1 : 2005 Design, preparation andapplication of external rendering and internal plastering— External rendering

BS EN ISO 6946 : 1997 Building components andbuilding elements — Thermal resistance and thermaltransmittance — Calculation method


7

Conditions of Certification17 Conditions17.1 This Certificate:• relates only to the product/system that is named and

described on the front page• is granted only to the company, firm or person named

on the front page — no other company, firm orperson may hold or claim any entitlement to thisCertificate

• is valid only within the UK• has to be read, considered and used as a whole

document — it may be misleading and will beincomplete to be selective

• is copyright of the BBA• is subject to English law.

17.2 References in this Certificate to any Act ofParliament, Statutory Instrument, Directive or Regulationof the European Union, British, European or InternationalStandard, Code of Practice, manufacturers’ instructionsor similar publication, are references to such publicationin the form in which it was current at the date of thisCertificate.

17.3 This Certificate will remain valid for an unlimitedperiod provided that the product/system and themanufacture and/or fabrication including all related andrelevant processes thereof:• are maintained at or above the levels which have

been assessed and found to be satisfactory by theBBA

• remain covered by a valid Irish Agrément; and• are reviewed by the BBA as and when it considers

appropriate.

17.4 In granting this Certificate, the BBA is notresponsible for:• the presence or absence of any patent, intellectual

property or similar rights subsisting in theproduct/system or any other product/system

• the right of the Certificate holder to manufacture,supply, install, maintain or market the product/system

• individual installations of the product/system,including the nature, design, methods andworkmanship of or related to the installation

• the actual works in which the product/system isinstalled, used and maintained, including the nature,design, methods and workmanship of such works.

17.5 Any information relating to the manufacture,supply, installation, use and maintenance of thisproduct/system which is contained or referred to in thisCertificate is the minimum required to be met when theproduct/system is manufactured, supplied, installed,used and maintained. It does not purport in any way torestate the requirements of the Health & Safety at Worketc Act 1974, or of any other statutory, common law orother duty which may exist at the date of this Certificate;nor is conformity with such information to be taken assatisfying the requirements of the 1974 Act or of anystatutory, common law or other duty of care. In grantingthis Certificate, the BBA does not accept responsibility toany person or body for any loss or damage, includingpersonal injury, arising as a direct or indirect result of themanufacture, supply, installation, use and maintenanceof this product/system.

In the opinion of the British Board of Agrément, Ballytherm BTCW Tongue-and-Groove CavityWall Insulation is fit for its intended use provided it is installed, used and maintained as set outin this Certificate. Certificate No 07/4422 is accordingly awarded to Ballytherm Ltd.






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