BBA Certificate - Just Insulation
Contents
1. APPROVAL Celotex Limited INSPECTION Lady lane Industrial Estate EUN ATIGR Hadleigh TECHNICAL APPROVALS FOR CONSTRUCTION loswich is ic UE Fax 01473 820880 Agrement Certificate el ax email technical celotex co uk 09 4667 website www celotex co uk Product Sheet 1 CELOTEX INSULATION CELOTEX RANGE OF PIR INSULATION BOARDS FOR TIMBER FRAME DWELLINGS This Certificate relates to the Celotex Range of PIR nsulation Boards for TimberFrame Dwellings a range of rigid polyisocyanurate PIR foam boards with aluminium foil facings for use between studding as an insulated lining an insulated sheathing or as part of a system incorporating any combination of these options in walls of conventional timber frame dwellings AGREMENT CERTIFICATION INCLUDES factors relating to compliance with Building Regulations where applicable factors relating to additional non regulatory information where applicable e independently verified technical specification NAE AE Ea SH GEA VI ur UA TEA VS assessment criteria and technical investigations design considerations e installation guidance regular surveillance of production e formal three yearly review KEY FACTORS ASSESSED Thermal performance typical wall constructions incorporating the products can achieve U values between 0 11 W m K and 0 29 W m K The thermal conductivity Xgg 9 Value of the products is declared2. 2 Technical Handbook Non Domestic 47 The Building Regulations Northern Ireland 2000 as amended 5 Regulation B2 Fitness of materials and workmanship Comment The products are acceptable See section 13 and the Installation part of this Certificate Regulation C5 Condensation Comment Walls incorporating the products can satisfy this Regulation See section 6 3 of this Certificate Regulation E3 a Internal fire spread Linings Comment Walls incorporating the products can meet this Regulation See section 7 2 of this Certificate Regulation EA T 4 Internal fire spread Structure Comment Walls incorporating the products can satisfy this Regulation See sections 7 1 and 7 3 of this Certificate Regulation F2 a i Conservation measures Comment The products are acceptable See sections 5 3 to 5 5 of this Certificate Regulation F3 2 Target carbon dioxide Emission Rate Comment The products can contribute to a building satisfying its target emission rate See sections 5 3 to 5 5 of this Certificate Page 2 of 12 Construction Design and Management Regulations 2007 Construction Design and Management Regulations Northern Ireland 2007 In the opinion of the BBA there is no information in this Certificate which relates to the obligations of the client CDM co ordinator designer and contractors under these Regulations Non regulatory Information NHBC Standards 2010 NHBC acc
3. into dwellings 0 19 Extension to dwelling 0 19 Alterations and reconstructions to a dwelling 0 22 Stand alone building 50 m to a dwelling 0 22 ew non dwelling limit for shell and fit out 0 23 ew dwelling limit 0 25 Conversion of unheated building 0 25 on domestic extension alteration and reconstructions 0 25 ew non domestic limit 0 27 Conversion of heated building 0 30 otional non dwelling 0 30 1 Flexible approaches on existing buildings are given in the Technical Handbooks Table 5 Mean design wall U values Northern Ireland Construction U value W mr 2 K Existing building new wall 0 30 otional dwelling 0 35 otional non domestic building 0 35 Building new build limit 0 35 Existing building replaced renovated and retained wall 0 35 1 Flexible approaches on existing buildings are given in the Technical Booklets New buildings 5 4 Walls with U values lower than or the same as for dwellings in Scotland the relevant notional value specified in Tables 3 4 or 5 will contribute to a building meeting its Target Emission Rate Walls with higher U values will require additional energy saving measures in the building envelope and or services 5 5 The products can maintain or contribute to maintaining continuity of thermal insulation at junctions between elements For Accedited Construction Details the corresponding psi values in BRE Information Paper IP 1 06 Assessing the effects of thermal bridging
4. Lane fax 01923 665301 Garston Watford e mail mail amp bba star co uk Herts WD25 9BA website www bbacerts co uk Page 1 of 12 Regulations In the opinion of the BBA the Celotex Range of PIR Insulation Boards for Timber Frame Dwellings if used in accordance with the provisions of this Certificate will meet or contribute to meeting the relevant requirements of the following Building Regulations 47 The Building Regulations 2010 England and Wales 5 Requirement B2 Internal fire spread linings Comment Walls incorporating the products can meet this Requirement See section 7 2 of this Certificate Requirement B3 1 4 Internal fire spread structure Comment Walls incorporating the products must comply with this Requirement See sections 7 1 and 7 3 of this Certificate Requirement C2 a b c Resistance to moisture Comment Walls incorporating the products can meet this Requirement See sections 6 1 and 6 3 of this Certificate Requirement L1 a i Conservation of fuel and power Comment The products are acceptable See sections 5 3 to 5 5 of this Certificate Requirement Regulation 7 Materials and workmanship Comment The products are acceptable See section 13 and the Installation part of this Certificate 5 k The Building Scotland Regulations 2004 as amended Regulation 8 1 Fitness and durability of materials and workmanship Comment The products satisty the requirements
5. N ISO 6946 2007 Building components and building elements Thermal resistance and thermal transmittance Calculation method Page 10 of 12 Conditions of Certification 16 Conditions 16 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 entitlement to this Certificate is valid only within the UK li to be read considered and used as a whole document it may be misleading and will be incomplete to be selective is copyright of the BBA e is subject to English law 16 2 Publications and documents referred to in this Certificate are those that the BBA deems to be relevant at the date of issue or re issue of this Certificate and include any Act of Parliament Statutory Instrument Directive Regulation British European or International Standard Code of Practice manufacturers instructions or any other publication or document similar or related to the aforementioned 16 3 This Certificate will remain valid for an unlimited period provided that the product system and the manufacture and or fabrication including all related and relevant processes thereof are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA continue to be checked as and when deemed appropriate by the BBA under arran
6. Plain gt 150 XR4000 Unreinforced 110 200 1200 x 2400 gt 120 29 32 Plain gt 150 FRAOO0 Reinforced 25 90 mm and unreinforced 100 mm and above 25 150 1200 x 2400 gt 120 32 Plain gt 150 1 Used as lining only 2 Thickness 25 45 mm used as lining only 2 Delivery and site handling 2 1 The boards are delivered in wrapped packs Each pack contains a label with the manufacturer s name and the BBA identification mark incorporating the number of this Certificate 2 2 The boards must be protected from prolonged exposure to sunlight and should be stored either under cover or Rs with opaque polythene sheeting Where possible packs should be stored inside If stored outside the oards should be stacked flat and raised above ground level and not in contact with ground moisture 2 3 Care must be exercised in handling individual boards to avoid crushing the edges or corners 2 4 Boards must not be exposed to open flame or other ignition sources Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on the Celotex Range of PIR Insulation Boards for Timber Frame Dwellings Page 3 of 12 3 General 3 1 The Celotex Range of PIR Insulation Boards for Timber Frame Dwellings is effective in reducing the thermal transmittance U value of external walls of timberframe dwellings It is essential that such walls are designed and constructed to incorporate the normal prec
7. ability of installation The products are designed to be installed by a competent general builder or a contractor experienced with these types of products 5 Thermal performance 5 1 Calculations of thermal transmittance U value should be carried out in accordance with BS EN ISO 6946 2007 BRE Report BR 443 2006 Conventions for U value calculations and 0 022 W m K declared thermal conductivity Ng 99 value of the insulation and an emissivity value of 0 05 for the foil facer 5 2 The U value of a completed wall will depend on the selected insulation thickness and the insulating value of the masonry and the internal finishes Calculated U values for example constructions are given in Tables 2 a to 2 e Table 2 a Example wall U values Table 2 b Example wall U values Table 2 c Example wall U inter studs system 1 inter studs and drytining system 2 values sheathing system 3 Insulation thickness Inter stud Insulation thickness Inter stud and drylining Insulation thickness Sheathing mm W m K mm W m K mm W m K 7 59 0 25 1247501 0 20 5001 0 29 009 0 21 12410007 0 16 7 590 0 22 20 0 19 1241200 0 17 100 0 17 50 0 15 30 75 0 18 65 0 15 30 100 9 15 2008 0 13 304 1200 0 15 Table 2 d Example wall U values Table 2 e Example wall U values inter studs and sheathing system 4 lining and sheathing system 5 Insulation thickness Inte
8. aced between the plasterboard and the timber frame 14 17 Ties securing the external leaf are fixed through the board to the studs and the sheathing is held in place by the retaining discs on the wall ties 14 18 Internal finishes are applied as normal Technical Investigations 15 Investigations An examination was made of test data relating to water vapour resistance density thermal conductivity compressive strength dimensional accuracy e dimensional stability with temperature and humidity condensation risk Page 9 of 12 Bibliography BS 476 7 1997 Fire tests on building materials and structures Method of test to determine the classification of the surface spread of flame of products BS 476 21 1987 Fire tests on building materials and structures Methods for determination of the fire resistance of loadbearing elements of construction BS 5250 2002 Code of practice for control of condensation in buildings BS EN 1995 1 1 2004 Eurocode 5 Design of timber structures General Common rules and rules for buildings BS EN 1996 1 1 2005 Eurocode 6 Design of masonry structures General rules for reinforced and unreinforced masonry structures BS EN 1996 2 2006 Eurocode 6 Design of masonry structures Design considerations selection of materials and execution of masonry BS 7671 2008 Requirements for electrical installations IEE Wiring Regulations Seventeenth Edition BS E
9. amage including personal injury arising as a direct or indirect result of the manufacture supply installation use and maintenance of this product system Page 11 of 12 British Board of Agr ment tel 01923 665300 Bucknalls Lane fax 01923 665301 Garston Watford e mail mail amp bba star co uk Herts WD25 9BA website www bbacerts co uk Page 12 of 12
10. at junctions and around openings Table 3 may be used in carbon emission calculations in Scotland and Northern Ireland Detailed guidance for other junctions and on limiting heat loss and air infiltration can be found in England and Wales Approved Documents to Part L and for new thermal elements to existing buildings Accredited Construction Details version 1 0 See also SAP 2009 Appendix K and the iSBEM User Manual for new build Scotland Accredited Construction Details Scotland Northern Ireland Accredited Construction Details version 1 0 5 6 For existing buildings such as extensions or conversions walls will be acceptable where they do not exceed the relevant U value in Tables 3 4 or 5 and junctions and openings comply with section 5 5 Page 5 of 12 6 Risk of condensation Surface condensation 45 6 1 Walls will limit the risk of surface condensation adequately when the thermal transmittance U value does not exceed 0 7 W m2 K7 at any point and the junctions with other elements are designed in accordance with section 5 5 not exceed 1 2 Wm K at any point Guidance may be obtained from BS 5250 2002 Section 8 and Fro Walls will adequately limit the risk of surface condensation when the thermal transmittance U value does 5 BRE Report BR 262 2002 Thermal insulation avoiding risks Interstitial condensation 6 3 Walls incorporating the products will adequately limit the risk of inters
11. atproducing appliances the following provisions to the national Building Regulations are acceptable England and Wales Approved Document J Scotland Mandatory Standard 3 19 clauses 3 19 12 to 3 1 9 9021 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Northern Ireland Technical Booklet L 9 Weathertightness 9 1 Constructions incorporating the products and built in accordance with section 3 3 will resist the transfer of precipitation to the inner leaf and satisfy the national Building Regulations England and Wales Requirement C2 a b c Scotland Mandatory Standard 3 10 clause 3 10 5012 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Northern Ireland Regulation C4 9 2 In all situations it is particularly important to ensure during installation that wall ties and fixings are installed correctly and are thoroughly clean excess mortar is cleaned from the cavity face of the brick leaf and any debris removed from the covity installation is carried out to the highest level on each wall or the top edge of the insulation is protected by a cavity tray at lintel level a cavity tray stop ends and weepholes must be provided 10 De rating of electrical cables As with other insulation products it may be necessary in some cases to derrate electrical cables buried in insulation In BS 7671 2008 it is suggested that whe
12. autions against moisture ingress including a breather membrane over the timber sheathing 3 2 New buildings subject to the national Building Regulations should be designed in accordance with the relevant recommendations of BS EN 1995 1 1 2004 3 3 Constructions incorporating a masonry outer leaf includes masonry units and natural stone blocks should be in accordance with BS EN 1996 2 2006 The designed residual cavity width should be 50 mm and at no point less than 35 mm wide 1 A residual cavity nominally 50 mm wide will be required by the NHBC where normal standards of tolerance and workmanship are adopted n n 3 4 It is recommended that services which penetrate the dry lining eg light switches power outlets are kept to a minimum to limit damage to vapour checks In addition any penetrations should be either enclosed in plasterboard or stone mineral wool or suitably tested proprietary fire rated systems to preserve the fire resistance of the wall 3 5 This application requires the specifying of a vapour control layer VCI behind the internal finish The VCL should take the form of 500 gauge polythene or plasterboard backed with a vapour control membrane or similar 3 6 Installation must not be carried out until the moisture content of the timber frame is less than 20 3 7 When used as insulated sheathing the products will not contribute to the structural performance of the timber frame 4 Practic
13. by the Certificate holder as 0 022 W m K see section 5 Risk of condensation the products can contribute to minimising the risk of surface condensation see section 6 Behaviour in relation to fire walls incorporating the products have been tested to BS 476 21 1987 see section 7 Durability the products are durable and sufficiently stable to remain effective as an insulation for the life of the building see section 13 The BBA has awarded this Agr ment Certificate to the company named above for the products described herein These ples have been assessed by the BBA as being fit for their intended use provided they are installed used and maintained as set out in this Certificate On behalf of the British Board of Agr ment ae Z LL Date of Second issue 12 October 2010 Chris Hunt Greg Cooper Originally certificated on 6 September 2009 Head of Approvals vus Physics Chief Executive Certificate amended on 3 November 2010 with updated information in the Thermal performance section The BBA is a UKAS accredited certification body Number 113 The schedule of the current scope of accreditation for product certification is available in pdf format via the UKAS link on the BBA website at www bbacerts co uk Readers are advised to check the validity and latest issue number of this Agr ment Certificate by either referring to the BBA website or contacting the BBA direct British Board of Agr ment tel 01923 665300 Bucknalls
14. epts the use of the Celotex Range of PIR Insulation Boards for Timber Frame Dwellings when installed and used in accordance with this Certificate in relation to NHBC Standards Chapter 6 2 External timber framed walls General This Certificate relates to the Celotex Range of PIR Insulation Boards for Timber Frame Dwellings rigid polyisocyanurate PIR foam faced on both sides with low emissivity aluminium foil facings The products can be used between studding as an insulated lining an insulated sheathing or as part of a system incorporating any combination of these options in walls of conventional timberframe dwellings Technical Specification 1 Description 1 1 The Celotex Range of PIR Insulation Boards for Timber Frame Dwellings comprises Celotex T4000 GA4000 XRAOOO and FRAOOO PIR insulation boards consisting of PIR foam faced on both sides with low emissivity aluminium foil facings 1 2 The boards can be fixed between the studding as an insulated dry lining and as insulated sheathing facing tne cavity 1 3 The boards are available with the nominal properties shown in Table 1 Table 1 Nominal properties Product PIR core Thickness Dimensions Compressive Core Edge Water vapour composition strength densily detail resistance MIN s g mm mm kPa kg m3 TBA4000 Unreinforced 12 45 1200 x 2400 gt 120 26 29 Plain gt 150 GA4000 Reinforced except 50 mm and 100 mm unreinforced 50 100 1200 x 2400 gt 120 26 30
15. gements that it will determine are reviewed by the BBA as and when it considers appropriate 16 4 In granting this Certificate the BBA is not responsible for the presence or absence of any patent intellectual property or similar rights subsisting in the product 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 and workmanship of or related to the installation e he actual works in which the product system is installed used and maintained including the nature design methods and workmanship of such works 16 5 Any information relating to the manufacture supply installation use and maintenance of this product system which is contained or referred to in this Certificate is the minimum required to be met when the product system is manufactured supplied installed used and maintained It does not purport in any way to restate the requirements of the Health amp Safety at Work etc Act 1974 or of any other statutory common law or other duty which may exist at the date of this Certificate nor is conformity with such information to be taken as satisfying the requirements of the 1974 Act or of any statutory common law or other duty of care In granting this Certificate the BBA does not accept responsibility to any person or body for any loss or d
16. istance test report and the accompanying assessment to alter the design of the timber frame to ensure that the residual timber after 30 minutes will be adequate The Certificate holder should be contacted for these reports f openings for doors and windows should be framed out and any exposed timber covered with at least one layer of plasterboard see also section 3 4 1 Relates only to walls with a masonry outer leaf Other weatherresistant claddings should be demonstrated by an appropriate test or assessment Table 6 System construction details Component Description System 1 2 3 4 3 Inter stud Inter stud Sheathing Inter stud lining and lining and sheathing and sheathing Plasterboard 12 5 mm 0 25 W m K yes yes yes yes yes Batten 25 mm x 50 mm yes Celotex Minimum 12 mm yes a B yes Vapour control layer 500 gauge polythene or plasterboard backed with a vapour control membrane 0 15 mm yes yes yes yes yes Timber frame 140 mm by 38 mm timber studs at maximum 600 mm centres with cross noggings at 1 200 mm centres staggered by 600 mm between bays A 0 13 W mr K 15 default fraction yes yes yes yes yes Celotex Minimum 60 mm between studs yes yes yes Structural sheathing 9 mm OSB or plywood A 0 13 Wm KJ yes yes yes yes yes Celotex Minimum 50 mm E B yes yes yes Breather membrane yes yes yes yes yes Cavity 50 mm yes yes yes yes yes Brick 102 5 mm A 0 77 Wm KJ yes yes yes
17. of this Regulation See section 13 and the Installation part of this Certificate Regulation 9 Building standards construction Standard DA Cavities Comment Walls incorporating the products must comply with this Standard with reference to clauses 2 4 10121 and 2 4 2012 2 4 70 and 2 4 90 See section 7 3 of this Certificate Standard 255 Internal linings Comment Walls incorporating the products will satisfy this Standard with reference to clause 2 5 1012 See section 7 2 of this Certificate Standard 2 6 Spread to neighbouring buildings Comment Walls incorporating the products can satisfy this Standard with reference to clause 2 6 10 See sections 7 1 and 7 3 of this Certificate Standard O35 Condensation Comment The products can contribute to satisfying this Standard with reference to clauses 3 15 1 3 15 4 and 3 15 5 See sections 6 2 and 6 3 of this Certificate Standard 6 1 b Carbon dioxide emissions Standard 6 2 Building insulation envelope Comment The products are acceptable with reference to clauses or parts of 6 1 20 6 1 31 6 1 6 6 2 10 6 2 30 6 2 42 6 2 63 6 2 702 6 2 1 2012 and 6 2 1 3 2 of these Standards See sections 5 3 to 5 5 of this Certificate Regulation 12 Building standards conversions Comment All comments given for the products under Regulation 9 also apply to this Regulation with reference to clause O 1 202 and Schedule 6112 1 Technical Handbook Domestic
18. r stud Insulation thickness Lining and mm and sheathing mm sheathing W m K7 W m K 704 50 0 15 1245001 0 24 1004500 0 13 12475 0 19 1204500 0 12 1241008 0 16 7 5475 0 13 30 50 0 20 1004759 0 11 30475 0 16 1204750 0 11 3041008 0 14 1 Typical timberframe construction comprising 102 mm brick leaf 50 mm unventilated cavity 9 mm OSB board 15 timber studs 12 5 mm plasterboard 2 140 mm width timber studs 3 200 mm width timber studs Page 4 of 12 documents supporting the national Building Regulations The U values shown in Tables 2 a to 2 e indicate that the products can enable or contribute to enabling a wall to achieve typical design U values referred to in those supporting documents see Tables 3 4 and 5 AE When considering insulation requirements designers should refer to the detailed guidance contained in the Table 3 Mean design wall U values England and Wales Construction U value W m K71 otional non domestic building 0 26 Existing building new and replaced wall 0 28 Dwelling new build limit 0 30 Existing building renovated or retained walls 0 30 otional dwelling 0 35 on domestic new build limit 0 35 1 Flexible approaches on existing buildings are given in the Approved Documents Table 4 Mean design wall U values Scotland Construction U value W m K7 Notional dwelling 0 19 New dwelling simplified method 0 19 Conversion unheated building
19. re temporarily fixed to the inner face of the timber studding ensuring that the insulation makes contact or over laps with ceiling and floor insulation 4 9 The line of the timber studs is marked on the boards to allow fixing of plasterboard Page 8 of 12 14 10 Boards should be butted tightly against each other to prevent gaps Taping the joints with aluminium foil reinforced tape provides an effective vapour control layer and an air permeability barrier To achieve an adequate bond the boards should be thoroughly clean and free trom any contamination 14 11 The insulation is sealed at all service penetrations 14 12 The per is fixed over the board on battens and secured with conventional nails or screws to the appropriate length and finished as normal Sheathing 14 13 The boards should be installed on the outside of any wood OSB or board sheathing closely butted with joints staggered and should be restrained using galvanized clout nails at 300 mm centres around the board perimeters and at 400 mm centres for intermediate timbers within the board area 14 14 It is essential that nails locate the studs and this can be achieved by either using a plumb line from the top of the studs or by marking the stud positions on the boards or substrate timber sheathing as the boards are being offered info position 14 15 The use of selFadhesive foil tape is not recommended 14 16 A sealed vapour control layer with lapped and sealed joints is pl
20. re wiring is completely surrounded by insulation it may need to be de rated to as low as half its free air current carrying capacity Guidance should be sought from a qualified electrician 11 Infestation Use of the products does not in itself promote infestation The creation of voids within the structure ie gaps between the wall lining and the boards may provide habitation for insects or vermin in areas already infested Care should be taken to ensure wherever possible that all voids are sealed as any infestation may be difficult to eradicate There is no food value in the materials used 12 Maintenance As the insulation component of the products are confined behind the wall lining and they have suitable durability see section 13 maintenance is not required 13 Durability A boards are rot proof stable and durable and will have a life equivalent to that of the wall structure in which 53 gm they are incorporated 14 General 14 1 Installation of the Celotex Range of PIR Insulation Boards for Timber Frame Dwellings must be in accordance with the relevant clauses of BS EN 1996 1 1 2005 and the Certificate holder s instructions Installation details of the three constructions are given in Figure 1 14 2 The boards are light to handle and cut easily but care must be taken to prevent damage particularly at edges 14 3 Damaged boards should not be used small areas of damaged faces may be repaired with selFadhesive alumini
21. titial condensation when they are 2 designed and constructed in accordance with BS 5250 2002 Section 8 and Annex DJ 6 4 Both foil facings have a water vapour resistance exceeding 70 MN s g and the insulation core has a water vapour resistivity of 300 MN s g m and can provide a significant resistance to water vapour transmission when all joints between boards are taped for over stud applications 6 5 When used as insulated sheathing the joints between the boards must not be taped If the products are to be used in the external walls of rooms expected to have high humidity care must be taken to provide adequate permanent ventilation to avoid possible problems from the formation of interstitial condensation in the wall 7 Behaviour in relation to fire 7 1 A fireresistance test was carried out in accordance with BS 476 21 1987 on a loadbearing timber stud ZA 3 wall system An assessment considered the likely fire resistance of all systems see Table 6 as if they had been tested to BS 476 21 1987 The main points of the assessment highlighted that alll systems are suitable for applications where a fire resistance of up to 30 minutes is required against the loadbearing capacity integrity and insulation criteria of BS 476 21 1987 for fire exposure from the inside when subject to a total imposed load of 60 kN 10 kN load per stud e for loads greater than this a qualified structural engineer can utilise the BS 476 21 1987 fireres
22. um foil tape Page 7 of 12 Figure 1 Installation details vapour control layer plasterboard 25 mm x 25 mm batten stud Celotex GA4000 XR4000 FR4000 breather membrane 9 mm OSB sheathing inter stud only 25 mm x 50 mm batten Celotex TB4000 or FR4000 Celotex GA4000 XR4000 FR4000 VAAN breather membrane inter stud and lining vapour control layer 9 mm OSB sheathing Celotex GA4000 XR4000 FR4000 AAAI DAA ACCRA ju jfi sheathing only Inter studs 4 4 The products should be cut to fit tightly between the timber studding and positioned against the inner face of heathing board Any gaps should be filled with expanding insulation foam The insulation should be held in place by nails or timber battens to the warm side of the insulation n 4 5 The void created by space between the inner surface of the products and the dry lining can be utilised as an insulated service duct 4 6 A sealed polythene vapour control layer with a minimum thickness of 0 125 mm 500 gauge with lapped and sealed joints is placed over the stud face before applying the internal finish Inter studs and lining 4 7 A sealed polythene vapour control layer with a minimum thickness of 0 125 mm 500 gauge with lapped and sealed joints is placed over the stud face To satisfy the requirements of NHBC Standards 2010 a vapour control layer should be placed on the warm side of the wall insulation 4 8 The boards a
23. yes yes General notes about fixings plasterboard Systems 1 2 and 3 50 mm by 3 5 mm drywall screws at nominal 150 mm centres plasterboard System 2 110 mm by 4 1 mm drywall screws at nominal 150 mm centres to a fixing depth of 40 mm OSB System 1 25 mm by 3 5 mm cross head screws at nominal 600 mm centres OSB Systems 2 and 3 50 mm by 3 5 mm crosshead screws at nominal 600 centres Celotex PIR insulation System 3 clips on wall ties minimum of three ties per square metre timber battens System 2 4 1 mm crosshead screws at nominal 300 mm centres to a fixing depth of 40 mm into the studs wall ties timberframe ties should be used in line with fixing manufacturer s instructions Typical values 17 W mr K cross section 18 mm and 3 7 fixings per m Page 6 of 12 7 2 The products TB4000 and GA4000 up to 90 mm have a Class 1 rating surface spread of flame when tested to BS 4767 1997 FRAOOO achieves Class O in accordance with BS 476 Parts 6 and 7 7 3 Cavity barriers must be provided to comply with England and Wales Approved Document B Section 6 Scotland Mandatory Standard 2 4 clauses 2 4 1023 2 4 202 2 4 7 and 2 4 9 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Northern Ireland Technical Booklet E paragraphs 3 35 to 3 38 8 Proximity of flues and appliances When installing the products in close proximity to certain flue pipes and or he
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