BBA certificate 07/4418
Contents
1. Page 13 of 132. assist the client CDM co ordinator designer and contractors to address their obligations under these Regulations See sections Description 1 2 and 1 3 and 3 Delivery and site handling 3 4 of this Certificate Page 2 of 13 Additional Information NHBC Standards 2013 NHBC accepts the use of Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System provided it is installed used and maintained in accordance with this Certificate in relation to NHBC Standards Chapter 7 1 Flat roofs and balconies Technical Specification 1 Description 1 1 The Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System consists of extruded polystyrene XPS boards rebated for lap jointing see Figure 1 used with the Polyfoam Slimline System waterreducing layer for use with a gravel ballast paving or green roof finish 1 2 Characteristics of the boards are given in Table 1 Table 1 Nominal characteristics Work size mm 1250 x 600 Overall size mm 1265 x 615 Standard thicknesses mm 70 130 160 180 200 and 220 Water vapour permeability MN s g m 625 Minimum compressive strength at 10 compression kPa 300 Edge profile see Figure 1 rebated 1 Thicknesses gt 220 mm and up to a maximum thickness of 360 mm are achieved by combining up to three insulation boards 1 3 The Polyfoam Slimline System is used as a filter layer and water control layer between the insulation and the r
3. three yearly review KEY FACTORS ASSESSED Thermal performance the system can contribute towards the thermal performance of a roof The design thermal conductivity Np including moisture correction factor of the boards is 0 034 W m K7 for XPS thicknesses greater than or equal to 100 mm and 0 035 W m K 1 for XPS thicknesses less than 100 mm see section 6 Condensation risk the system will contribute to limiting the risk of surface and interstitial condensation see section 7 Resistance to foot traffic the system when installed on appropriate decks finished with a gravel ballast layer paving slabs or a green roof can be used on untrafficked roofs with limited pedestrian access associated with maintenance operations and pedestrian access roofs on balconies and roof terraces subject to foot traffic only see section 8 Durability the system will remain effective as an insulant for at least 25 years as long as the Polyfoam Slimline System water reducing layer remains unchanged see section 1 2 The BBA has awarded this Certificate to the company named above for the system described herein This yee has been assessed by the BBA as being fit for its intended use provided it is installed used and maintained as set out in this Certificate On behalf of the British Board of Agr ment LLM ae Cai ee ae Date of Second issue 20 December 2013 John Albon Head of Approvals Claire Curtis Thomas Originally cert
4. to the calculated thermal transmittance of the roof element W m K 1 p average rate of precipitation during the heating season mm day f drainage factor giving the fraction of p reaching the waterproof membrane x factor for increased heat loss caused by rainwater flowing on the membrane W day m K mmr R thermal resistance of the layer of the insulation above the waterproofing membrane m K VW 1 R total thermal resistance of the construction before application of the correction m K VWW f 0 001 for the system incorporating the Polyfoam Slimline System water reducing layer 1 Values for average monthly rainfall for different UK locations can be found at www metoffice gov uk climate uk averages 19812010 The values for October to March should be summed and divided by 182 to obtain an average p in mm day for the heating season Page 7 of 13 6 3 The system can contribute to maintaining continuity of thermal insulation at junctions For Accredited Construction Details the corresponding values Psi in BRE Information Paper IP 1 06 Table 3 may be used in carbon emission calculations in Scotland and Northern Ireland Detailed guidance for other junctions and on limiting heat loss by 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
5. San Knauf Insulation Ltd y A ree P O Box 10 CERTIFICATION Stafford Road TECHNICAL APPROVALS FOR CONSTRUCTION St Helens Ba are 01744 766667 marement Soe el ax email technical uk knaufinsulation com 07 441 8 website www knaufinsulation co uk Product Sheet 1 KNAUF INSULATION INVERTED ROOFS SYSTEM POLYFOAM ECO ROOFBOARD EXTRA INCORPORATING THE POLYFOAM SLIMLINE SYSTEM This Agr ment Certificate Product Sheet relates to Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System which uses extruded polystyrene boards The XPS boards are used in conjunction with the Polyfoam Slimline System waterreducing layer and gravel ballast or paving protection for inverted flat untrafficked roofs and balconies and terraced roofs subject to pedestrian access only When used in conjunction with a suitable root barrier the system may be used in green roof applications The Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System may be used with zero pitch and slopes between 1 80 and 1 6 1 Hereinafter referred to as Certificate CERTIFICATION INCLUDES e factors relating to compliance with Building Regulations where applicable e factors relating to additional non regulatory information where applicable independently verified technical specification assessment criteria and technical investigations design considerations installation guidance regular surveillance of production formal
6. age points need to be located at the lowest point of the roof to facilitate the effective removal of rainwater Care is needed to identify these locations For example precast concrete decks will deflect between spans and mid span may be the lowest point of the roof rather than roof edges or column supports 4 16 Where there is a risk from plasticiser migration or other contaminants from the roof waterproofing such as PVC single ply membranes a suitable plastic fibre or similar isolating sheet must be interposed between the roof waterproofing and the XPS insulation boards For loose laid single layer roof waterproofing membranes a cushion layer should be interposed 5 Practicability of installation The system is designed to be installed by a competent general builder or contractor experienced with this type of system 6 Thermal performance accordance with BS EN ISO 6946 2007 and BRE Report BR 443 2006 using the design thermal conductivity 4 4S Calculations of the thermal transmittance U value of a specific roof construction should be carried out in included moisture correction factor and f drainage factor for the system as given below See also BBA Information Bulletin No 4 BS EN ISO 10456 2007 and ETAG 031 2010 e 0 035 W m K design thermal conductivity y including moisture correction factor for XPS thicknesses less than 100 mm e 0 034 W m K design thermal conductivity y including moi
7. al or timber roofs should be designed in accordance with the relevant provisions of BS 6229 2003 BS 8217 2005 and BS 8218 1998 in particular to accommodate the weight of the ballast layer 4 11 Decks should be covered with one or more of the following roof waterproofing specifications e built up felt roofing to BS 8217 2005 using Type 3 and Type 5 felts to BS 8747 2007 e mastic asphalt laid in accordance with BS 8218 1998 e other waterproofing systems which are the subject of a current Agr ment Certificate laid in accordance with and within the limitations imposed by that Certificate 4 12 The roof shall be designed with adequate falls 1 Unless the roof waterproofing system has been specifically designed and approved for use in a zero pitch roof application For zero pitch roofs it is particularly important to identify the correct drainage points to ensure that the drainage provided is sufficient and effective 4 13 Itis essential that roof falls and drainage paths are correctly designed to avoid ponding and subsequent risk of silt build up stresses in freezing conditions and to reduce water entry in the event of a failure in the waterproofing layer Page 6 of 13 4 14 Dual level roof drainage should be provided in accordance with BS 6229 2003 and BS EN 12056 3 2000 to drain water off at the level of the Polyfoam Slimline System and also at the level of the roof waterproofing See Figures 6 to 8 4 15 Drain
8. and the iSBEM User Manual for new build Scotland Accredited Construction Details Scotland Northern Ireland Accredited Construction Details version 1 0 6 4 The Certificate holder has at least one member of staff who has been deemed competent by the BBA under the BBA TIMSA Scheme for Calculation Competency U value and Condensation Risk Analysis Competent persons should be contacted for accurate quality assured U value and condensation risk analysis The Certificate of Competency can be found on the BBA website http www bbacerts co uk as Certificate CS 1001 7 Condensation risk 7 1 Warm water trapped under the boards is likely to be replaced by colder water during rainfall Therefore during heavy or continuous rainfall the roof waterproofing and the deck will be cooled If condensation does occur it will be shortterm disappearing when the rain stops 7 2 Risk of interstitial condensation will be minimal with concrete decks but metal and timber decks will be subjected to short periods of moisture therefore timber must be treated with a suitable preservative in accordance with BS 8417 2011 Interstitial condensation 7 3 Roots will adequately limit the risk of interstitial condensation when they are designed and constructed in gt accordance with BS 5250 2011 Section 4 and Annex D and H Surface condensation 47 7 4 Roofs will adequately limit the risk of surface condensation when the thermal transm
9. at on a clean level surface and under cover to protect them from high winds They must not be exposed to open flame or other ignition sources 3 5 Damaged boards must not be used Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System 4 Use 4 1 The Polyfoam ECO Rootboard Extra incorporating the Polyfoam Slimline System is suitable for use on inverted flat or zero pitch untrafficked roofs and balconies and terraced roofs subject to pedestrian access only with a gravel ballast paved or green roof finish and a suitably designed timber concrete or metal structural deck and appropriate fully supported waterproofing system 4 2 For the purpose of this Certificate e flat roofs are defined as those roofs having either a minimum finished fall between 1 80 and 1 6 or zero pitch with finished falls from O to 1 80 For design purposes on sloping flat roofs twice the minimum finished fall should be assumed unless a detailed analysis of the roof is available including overall and local deflection direction of falls etc See also BBA Information Bulletin No 4 Untrafficked roof e a roof consisting of the structural deck and all the layers on it including waterproofing insulation and a surface protective layer not designed for foot traffic above that required for maintenance of roof and or techn
10. aving slabs 4 4 Cast stone or mineral slab pavings of at least 40 mm thickness on boards 50 mm thick and 50 mm on thicker boards must meet the requirements of sections 7 3 and 9 of this Certificate Paving slabs can either be laid fully supported or may be supported using proprietary spacer pads in accordance with the manufacturer s instructions 4 5 The paving slab finish is laid directly over the Polyfoam Slimline System laid with 300 mm unsealed lap joints Roof garden 4 6 A suitable root barrier or a water retention drainage layer with an integral root barrier is laid on top of the Polyfoam Slimline System A suitable root barrier tape is used to seal laps in the root barrier in accordance with the manufacturer s instructions Page 11 of 13 14 7 The green roof system including growing medium geotextile filter fleece water retention drainage layer and a root barrier installed in accordance with the manufacturer s instructions 14 8 All upstands roof perimeters drainage outlets and other protrusions through the green roof should be protected by a minimum 500 mm wide un vegetated barrier such as 16 mm to 32 mm rounded gravel aggregate or concrete paving slabs 15 Tests Tests were carried out by the BBA on the XPS board and the results assessed to determine e compressive strength e compressive creep e deformation under specified compressive load and temperature e dimensional stability e water vapour transmission e wate
11. ct quality the BBA agreed with the manufacturer the quality control procedures and product testing to be undertaken assessed and agreed the quality control operated over batches of incoming materials monitored the production process and verified that it is in accordance with the documented process evaluated the process for management of nonconformities checked that equipment has been properly tested and calibrated undertaken to carry out the above measures on a regular basis through a surveillance process to verify that the specifications and quality control operated by the manufacturer are being maintained Page 4 of 13 2 3 The management system of Knauf Insulation Lid has been assessed and registered as meeting the requirements of BS EN ISO 9001 2008 BS EN 14001 2004 EN 16001 2009 and OHSAS 18001 2007 by Bureau Veritas Certification Certificate BEOO1519 1 BE005999 2 BE 001520 1 and BEOO6OO00 1 3 Delivery and site handling 3 1 Boards are wrapped in polythene and delivered to site on pallets or bearers Each pack shows the manufacturer s name grade type marking and the BBA identification mark incorporating the number of this Certificate 3 2 Boards must be protected from prolonged exposure to sunlight and should be stored under cover or protected with lightcoloured opaque sheets 3 3 Care must be taken to avoid contact with solvents and materials containing organic components 3 4 Boards must be stored fl
12. d Extra concrete roof deck Page 10 of 13 Figure Z Water outlet detail paving finish Polyfoam Slimline paving slabs on Polyfoam ECO Membrane spacer pads drainage outlet Roofboard Extra L v XN R v P lt TO Tr concrete roof deck waterproofing membrane LO Figure 8 Water outlet detail green roof finish Polyfoam Slimline Polyfoam ECO green roof Membrane drainage outlet washed ballast Roofboard Extra TARON ATN NAN i ae SI ay f v T T concrete roof deck waterproofing membrane 14 Protective finishes Gravel ballast finish 14 1 In order to prevent flotation wind uplift and UV degradation the system must be covered with gravel ballast as the work proceeds to a minimum thickness of 50 mm 14 2 It is essential that the ballast is carefully placed directly over the Polyfoam Slimline System laid with 300 mm unsealed lap joints and that complete depth and cover is achieved over the entire surface of the system 14 3 Gravel must not contain excessive fines in order to prevent clogging of gullies and outlets and to discourage organic growth P
13. ical equipment f Pedestrian access roof e a roof consisting of the structural deck and all the layers on it including waterproofing thermal insulation and a surface protective layer designed for foot traffic and gathering of people greater than that required for maintenance Green roof e a roof consisting of the structural deck and all the layers on it including waterproofing thermal insulation and a thin layer of growing medium planted with vegetation and possibly including areas of paving 4 3 A roof ballast layer must be installed as work progresses to protect the insulation boards and the Polyfoam Slimline System from the effects of wind uplift and UV degradation The ballasted roof finish may be either gravel ballast paving or a green roof system which must be assessed by a specialist for its suitability according to region exposure and building height In addition the dead load imposed by the finish including the saturated weight of a green roof must be allowed for in calculating the total acceptable load on the deck Care must be taken to ensure that upgraded roofs are capable of carrying the increased load and depth of the installed system Ballast must not be stacked in one place on the roof unless the roof is capable of supporting it 4 4 Gravel ballast should be washed rounded and of nominal 16 mm to 32 mm in size laid to a minimum thickness of 50 mm The minimum size of ballast depends on
14. ificated on 19th February 2007 Energy and Ventilation Chief Executive 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 Lane fax 01923 665301 Watford email mail bba star co uk Herts WVD25 BA website www bbacerts co uk Page 1 of 13 Regulations In the opinion of the BBA Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System if installed used and maintained in accordance with this Certificate will meet or contribute to meeting the relevant requirements of the following Building Regulations the presence of a UK map indicates that the subject is related to the Building Regulations in the region or regions of the UK depicted 3 The Building Regulations 2010 England and Wales as amended 5 Requirement C2 c Resistance to moisture Comment The system can contribute to reducing the risk of condensation See sections 7 3 and 7 4 of this Certificate Requirement L1 a i Conservation of fuel and power Comment The system can contribute to satisfying this Requirement See sections 6 1 and 6 3 of this Certificate Regu
15. irm organisation or person may hold or claim that this Certificate has been issued to them e is valid only within the UK e has to be read considered and used as a whole document it may be misleading and will be incomplete to be selective e is copyright of the BBA e is subject to English Law 17 2 Publications documents specifications legislation regulations standards and the like referenced in this Certificate are those that were current and or deemed relevant by the BBA at the date of issue or reissue of this Certificate 17 3 This Certificate will remain valid for an unlimited period provided that the product system and its manufacture and or fabrication including all related and relevant parts and processes thereof e are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA e continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine e are reviewed by the BBA as and when it considers appropriate 17 4 The BBA has used due skill care and diligence in preparing this Certificate but no warranty is provided 17 5 In issuing this Certificate the BBA is not responsible and is excluded from any liability to any company firm organisation or person for any matters arising directly or indirectly from e the presence or absence of any patent intellectual property or similar rights subsisting in the product system or any other product
16. ittance U value does F not exceed 0 35 W m K at any point and the junctions with walls are designed in accordance with the relevant requirements of Limiting thermal bridging and air leakage Robust construction details for dwellings and similar buildings TSO 2002 or BRE Information Paper IP 1 06 1 2 W m K at any point Guidance may be obtained from BS 5250 2011 Section 4 and BRE Report M 5 In Scotland constructions will be acceptable when the thermal transmittance U value does not exceed 5 BR 262 2002 8 Resistance to foot traffic The XPS has adequate resistance to the loads associated with light maintenance traffic on roofs and to pedestrian foot traffic on balconies and roof terraces 9 Behaviour in relation to fire 9 1 The Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System ballasted with either aggregate minimum depth of 50 mm sand cement screed to a thickness of at least 30 mm or fully supported cast stone or mineral slabs of at least 40 mm thickness Therefore the roof may be considered to be of designation AA low vulnerability in Scotland and meets or satisfies the requirements of the national Building Regulations thus England and Wales Requirement B42 Scotland Mandatory Standard 2 8 clause 2 8 1012 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Northern Ireland Regulation 36 b 9 2 The designation of other roof covering specifications sho
17. lation 7 Materials and workmanship Comment The system is acceptable See section 12 1 and the Installation part of this Certificate Regulation 26 CO emission rates for new buildings Comment The system can contribute to satisfying this Regulation See sections 6 1 and 6 3 of this Certificate 5 k The Building Scotland Regulations 2004 as amended Regulation 8 1 2 Durability workmanship and fitness of materials Comment The system is acceptable See sections 11 1 and 12 1 and the Installation part of this Certificate Regulation 9 Building standards applicable to construction Standard SEIS Condensation Comment The system can contribute to satisfying this Standard with reference to clauses 3 15 102 3 15 3082 3 15 4013 3 15 5023 and 3 15 62 See sections 7 3 and 7 5 of this Certificate Standard 6 1 b Carbon dioxide emissions Standard Ow Building insulation envelope Comment The system can contribute to satisfying these Standards with reference to clauses or parts of 6 1 10 2M LAWA Mel AB 1 Sio 1 107 O24 2211 62 3 6 2 4012 6 2 52 6 2 6012 to 6 2 1 102 6 2 12 and 6 2 1 312 See sections 6 1 and 6 3 of this Certiticate Standard 7 1 a b Statement of sustainability Comment The system can contribute to satisfying the relevant requirements of Regulation 9 Standards 1 to 6 and therefore will contribute to a construction meeting a bronze level of sustainabi
18. lity as defined in this Standard In addition the system can contribute to a construction meeting a higher level of sustainability as defined in this Standard with reference to clauses 7 1 402 Aspects 1012 and 20 7 1 6012 Aspects 1012 and 20 and 7 1 7023 Aspect 1021 See section 6 1 of this Certificate Regulation 12 Building standards applicable to conversions Comment All comments given for the system under Regulation 9 Standards 1 to 6 also apply to this Regulation with reference to clause O 12 102 and Schedule 602 1 Technical Handbook Domestic 2 Technical Handbook Non Domestic Bs The Building Regulations Northern Ireland 2012 5 Regulation 23 Fitness of materials and workmanship Comment The system is acceptable See section 12 1 and the Installation part of this Certificate Regulation 29 Condensation Comment The system can contribute to satisfying this Regulation See section 7 3 of this Certificate Regulation 39 a i Conservation measures Comment The system can contribute to satisfying this Regulation See sections 6 1 and 6 3 of this Certificate Regulation 40 2 Target carbon dioxide emission rate Comment The system can contribute to satisfying this Regulation See sections 6 1 and 6 3 of this Certificate Construction Design and Management Regulations 2007 Construction Design and Management Regulations Northern Ireland 2007 Information in this Certificate may
19. oof ballast layer The nominal properties are shown in Table 2 Table 2 Physical properties of the Polyfoam Slimline System water reducing layer length m 100 width m 1 5 and 3 0 weight g m 100 Water vapour resistance MN s g 0 1 Lap joints mm unsealed 300 1 4 A suitable root barrier is used in green roof applications Laps in the root barrier are sealed using a suitable root barrier tape 1 5 Ancillary items outside the scope of this Certificate include e gravel ballast washed rounded and of nominal 16 mm to 32 mm in size laid to a minimum depth of 50 mm or e paving of minimum 40 mm thickness See sections 9 1 and 9 2 e green roof finish including root barrier filter fleece and drainage water retention layer to manufacturer s specification which also meet the relevant requirements of ETAG 031 2010 see section 4 2 Page 3 of 13 Figure 1 Rebate detail B A A B 600 mm a z ea 15 mm Y2 thickness Y2 thickness iSi le section A to A 1250 mm 15 mm oa Y2 thickness v2 thickness PS 15 mm section B to B 2 Manufacture 2 1 Raw materials are heated to form a molten plastic mix which is injected with blowing agent The foam is extruded and shaped in a die An automated process cures and cuts the product to the required size 2 2 As part of the assessment and ongoing surveillance of produ
20. r flow through an inverted roof e longterm water absorption by diffusion e resistance to freeze thaw e thermal conductivity e bowing under a thermal gradient 16 Investigations 16 1 The following independent data relating to the Polyfoam Slimline System were examined e tensile strength e resistance to static loading point loading e resistance to water penetration e hydrostatic head e water vapour transmission 16 2 The manufacturing process and quality control procedures were evaluated and details obtained of the quality and composition of materials used Bibliography BS 5250 2011 Code of practice for control of condensation in buildings BS 6229 2003 Flat roofs with continuously supported coverings Code of practice BS 8217 2005 Reinforced bitumen membranes for roofing Code of practice BS 8218 1998 Code of practice for mastic asphalt roofing BS 8417 2011 Preservation of wood Code of practice BS 8747 2007 Reinforced bitumen membranes RBMs for roofing Guide to selection and specification BS EN 1991 1 2 2002 Eurocode 2 Design of concrete structures General rules Structural fire design BS EN 1991 1 4 2005 Eurocode 1 Actions on structures General actions Wind actions NA to BS EN 1991 1 4 2005 UK National Annex to Eurocode 1 Actions on structures General actions Wind actions BS EN 12056 3 2000 Gravity drainage systems inside buildings Roof drainage la
21. round any penetrations 3 4 The Polytoam Slimline System is laid with 300 mm unsealed laps overlapping in the downward direction of the flat roof slope immediately on top of the insulation boards At upstands and penetrations the Polyfoam Slimline System must be turned up to finish above the surface of the ballast layer and turned down at drainage outlets See Figures 4 to 8 Figure 4 Parapet upstand detail gravel paving finish Polyfoam ECO Upstand Board spacer pads Polyfoam ECO Polyfoam Slimline paving slab Roofboard Extra Membrane DS A iN waterproofing membrane concrete roof deck it VY Page 9 of 13 Figure 5 Parapet upstand detail green roof finish Polyfoam ECO Upstand Board I l drainage element reservoir i growing medium filter membrane and root barrier I NY VIR AWV Polyfoam Slimline ERS EP Memb Seg K embrane Polyfoam ECO Roofboard Extra waterproofing membrane concrete roof deck AAAY Figure 6 Water outlet detail gravel finish drainage outlet washed ballast i Polyfoam Slimline Membrane Polyfoam ECO Roofboar
22. sture correction factor for XPS thicknesses greater than or equal to 100 mm e f 0 001 drainage factor for systems incorporating the Polyfoam Slimline System The value of a completed roof will depend on the insulation thickness and type of substrate and internal finish When considering insulation requirements designers should refer to the detailed guidance contained in the documents supporting the national Building Regulations The U values shown in Table 3 indicate that the system can contribute to a root achieving typical U values referred to in those supporting documents Table 3 Example U values for flat roof and zero pitch applications incorporating the Polytoam Slimline System Required U Value Polyfoam ECO Roofboard Extra standard stock thickness W m K required mm p lt 3 pl 8 0 10 160 160 180 180 0 13 180 70 130 130 0 15 220 160 70 0 16 200 220 0 18 180 200 0 20 160 180 0 25 130 130 1 200 mm dense concrete deck 2 5 W mr K 1 2 Thickest board as bottom layer when double triple layer used 3 Values for p taken as examples of best to worst case for all UK locations 6 2 Rainfall reaching the roof waterproofing membrane will temporarily affect the rate of heat loss from the roof and should be accounted for by adding a correction AU to the calculated roof U value in accordance with Annex D 4 of BS EN ISO 6946 2007 as follows AU pf R R where AU correction
23. system e the right of the Certificate holder to manufacture supply install maintain or market the product system e actual installations of the product system including their nature design methods performance workmanship and maintenance e any works and constructions in which the product system is installed including their nature design methods performance workmanship and maintenance e any loss or damage including personal injury howsoever caused by the product system including its manufacture supply installation use maintenance and removal e any claims by the manufacturer relating to CE marking 17 6 Any information relating to the manufacture supply installation use maintenance and removal 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 maintained and removed It does not purport in any way to restate the requirements of the Health and Safety at Work etc Act 1974 or of any other statutory common law or other duty which may exist at the date of issue or reissue of this Certificate nor is conformity with such information to be taken as satistying the requirements of the 1974 Act or of any statutory common law or other duty of care British Board of Agr ment tel 01923 665300 Bucknalls Lane fax 01923 665301 Watford email mail bba star co uk Herts WD25 9BA website www bbacerts co uk
24. ted inverted roofs can be upgraded by the addition of insulation so long as there is sufficient height in the parapets and roof lights This may also require additional ballast therefore the structural deck must be adequate to support the extra loading from the increase in weight 5 The Certificate holder must approve any upgrading using a loose layer of insulation on top of the existing insulation 12 Durability 4 12 1 The XPS board is rot resistant and as long as the Polyfoam Slimline System water reducing layer remains 53 undamaged will have a life of at least 25 years under normal circumstances 12 2 Care must be taken to ensure that the gravel ballast or paving green roof covering once installed provides cover to the Polyfoam Slimline System at all times to avoid UV degradation of the membrane 13 General 3 1 Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System are laid over a compatible and complete waterproofing system see section 4 11 generally starting at the point of access in a brick bond pattern 3 2 The XPS boards must be laid flat and tightly interlocked to prevent gaps in the insulation layer Insulation boards are laid in an advancing front with the Polyfoam Slimline System water reducing layer on top and the ballast paving or green roof covering laid as soon as possible to protect the system 3 3 Where necessary boards are cut accurately with a fine tooth saw or with a hot wire cutter a
25. the wind loads and parapet height to prevent wind scour of the ballast The ballast should be installed in accordance with BS EN 1991 1 4 2005 and its National Annex 4 5 The gravel ballast specification given in section 4 4 is suitable in sheltered regions or buildings up to 10 storeys On buildings up to 15 storeys this specification may be used but the perimeter must be loaded with paving determined by reference to BS EN 1991 1 2 2002 For other exposure conditions or tall buildings specialist advice should be sought 4 6 A paving finish ballast comprising a minimum 40 mm of standard pressed concrete paving slabs is suitable in sheltered regions and in buildings up to 15 storeys For other exposure conditions or tall buildings specialist advice should be sought 4 7 The Green Roof Guide states that for inverted roofs a green roof can be used as ballast provided the weight of the green roof is the same as a required gravel ballast finish The growing medium must have resistance to wind and water erosion and be spread over a suitable filter and drainage layer The green roof covering should be assessed for Page 5 of 13 wind uplift with sufficient growing medium weight calculated for roof ballast The green roof specification including growing medium geotextile filter fleece drainage waterretention layer and root barrier is to be determined by the specialist supplier 4 8 The Polyfoam ECO Roofboard Extra should be o
26. uld be confirmed as required by the national Building Regulations 9 3 The Polyfoam ECO Roofboard Extra incorporating the Polyfoam Slimline System should not be laid over compartment walls 10 Effect on roof coverings The protected inverted roof system will provide solar protection and also limit the range of temperatures to which the waterproofing membrane will be subjected Placing the insulation on top of the roof covering will normally lead to an extended life of the waterproof membrane 11 Maintenance J 11 1 The inverted roof concept should require little or no maintenance other than annual removal of any plants 53 y lin the case of gravel paving finish cleaning checking of water outlets and gutters if necessary and checking Page 8 of 13 that the gravel ballast is still in place and not interfering with or blocking gullies or outlets Any displaced ballast for example by wind scouring should be promptly returned to its original state 2 The use of chemicals eg weed killers should be checked for compatibility with the insulation Polyfoam Slimline System and the deck waterproofing layer The Certificate holder can advise on the suitability of a particular system 3 Leaks in the waterproof membrane can be accessed by removal of the gravel ballast paving or green roof covering root barrier green roofs only Polyfoam Slimline System and insulation boards taking care not to damage the water reducing layer A Protec
27. verlaid with the Polyfoam Slimline System which acts as a filter ayer preventing fines and other debris from passing through and also as a water flow reducing layer minimising cold rainwater flowing between the insulation and the roof waterproofing with consequent heat loss This membrane may be covered with either a gravel ballast or paving finish see Figure 2 In green roof applications the Polyfoam ECO Rootboard Extra must be overlaid first with the Polyfoam Slimline System and additionally a root barrier installed on top to prevent root penetration before finishing with the green root specification 4 9 The Polyfoam Slimline System is to be laid with 300 mm laps overlapping in the downward direction of the flat roof slope At upstands and penetrations the membrane must be turned up to finish above the surface of the ballast ayer and turned down at drainage outlets Figure 2 Typical installation detail gravel paving ballast finish paving slab on spacer Polyfoam Slimline Polyfoarm ECO pads or washed ballast Membrane Roofboard Extra ETR v concrete roof deck waterproofing membrane Figure 3 Typical installation detail green roof finish drainage element reservoir Polyfoam Slimline growing medium filter membrane and root barrier Membrane tiiat R concrete roof deck waterproofing membrane Polyfoam ECO Roofboard Extra 4 10 Concrete met
28. yout and calculation BS EN ISO 6946 2007 Building components and building elements Thermal resistance and thermal transmittance Calculation method BS EN ISO 9001 2008 Quality management systems Requirements BS EN ISO 10456 2007 Building materials and products Hygrothermal properties Tabulated design values and procedures for determining declared and design thermal values BS EN ISO 14001 2004 Environmental Management systems Requirements with guidance for use BRE Information Paper IP 1 06 Assessing the effects of thermal bridging at junctions and around openings BRE Report BR 262 2002 Thermal insulation avoiding risks BRE Report BR 443 2006 Conventions for U value calculations Page 12 of 13 EN 16001 2004 Energy management systems Energy management systems Requirements with guidance for use Requirements with guidance for use EN 16001 2009 Energy management systems Energy management systems Requirements with guidance for use Requirements with guidance for use ETAG 031 2010 Guideline for European Technical Approval of Inverted Roof Insulation Kits OHSAS 18001 2007 Occupational health and safety management systems requirements Conditions of Certification 17 Conditions 17 1 This Certificate relates only to the product system that is named and described on the front page e is issued only to the company firm organisation or person named on the front page no other company f
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