1、BS 4841-3:2006Rigid polyisocyanurate (PIR) and polyurethane (PUR) products for building end-use applications Part 3: Specification for laminated boards (roofboards) with auto-adhesively or separately bonded facings for use as roofboard thermal insulation under built up bituminous roofing membranesIC
2、S 91.100.60NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2006ISBN 0 580 048191 3The following BSI references relate to the
3、work on this standard:Committee reference PRI/72/4Draft for comment 05/30121961 DCPublication historyFirst published, September 1987Second edition, January 1994Third edition, July 2006Amendments issued since publicationAmd. no. Date Text affectedBS 4841-3:2006 BSI 2006 iBS 4841-3:2006ContentsForewor
4、d ii1 Scope 12 Normative references 13 Terms, definitions and symbols 24 Construction and composition 25 Requirements 46 Designation 77 Marking 7AnnexesAnnex A (informative) Method for the determination of areas of unbonded facings 8Annex B (informative) Information for users and designers 10Annex C
5、 (informative) Reaction to fire performance of PIR and PUR products and recommendations regarding their use 11Annex D (informative) Information on the installation of roofboards into built-up roofs 11Annex E (informative) Dimensional stability in built-up roofing 12Bibliography 15List of figuresFigu
6、re 1 Diagram to explain orientations for compressive strength measurements 6Figure A.1 Determination of area(s) of unbonded facings: cutting and marking of the test specimen 9Figure E.1 Marking pattern for test specimens used in the method described in E.2 14List of tablesTable 1 Tolerances for leng
7、ths and widths 4Table 2 Classes for thickness tolerances 4Table 3 Deviation from flatness 5Table B.1 Relationships between roofboard thickness and metal deck trough openings 10Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 15, an inside back
8、cover and a back cover.ii BSI 2006BS 4841-3:2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 20 July 2006. It was prepared by Subcommittee PRI/72/4, Polyurethane, under the authority of Technical Committee PRI/72, Rigid cellular materials. Superses
9、sionThis part of BS 4841 supersedes BS 4841-3:1994, which is withdrawn.Information about this documentBS 4841-3:1987 was based on a draft quality assurance guide1), derived from a co-operative study between the British Rigid Urethane Foam Manufacturers Association (BRUFMA) and the Felt Roofing Conta
10、ctors Advisory Board (FRCAB)2). It provided requirements for two types of thermal insulating polyurethane and polyisocyanurate cored roofboards, faced on the two major faces with either auto-adhesively or separately bonded facings, and suitable for use beneath built-up bituminous felt roofing membra
11、nes.This edition introduces technical changes to reflect a full revision of the standard whilst taking into account the European Standard BS EN 13165:2001 (including amendments 1 and 2) for PIR and PUR factory made insulation products and now incorporates the European test methods. Attention is draw
12、n to BS 8217:1984 which describes the recommended practice for laying the roofboards conforming to this standard, into roof structures and their weatherproofing, to maximise their service performance after installation.Additional information for the guidance of users, installers and designers is giv
13、en in informative Annexes A, B, C, D and E to this standard.The other parts of BS 4841 have also been revised to reflect recent technical advances and to take into account the European Standard BS EN 13165:2001 (including amendments 1 and 2).Presentational conventionsThe provisions of this standard
14、are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal obl
15、igationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.1)First issued by BRUFMA and FRCAB in 1979.2)Now the Flat Roofing Allian
16、ce. BSI 2006 1BS 4841-3:20061 ScopeThis British Standard specifies requirements for rigid polyisocyanurate (PIR) and polyurethane (PUR) cored laminated boards (roofboards) with auto-adhesively or separately bonded flexible and/or rigid facings, for use as roofboard thermal insulation under built-up
17、bituminous roofing membranes. The standard also applies to product roofboards with one flexible and one rigid facing.NOTE 1 Because of the changes introduced into this standard, products conforming to this standard also conform to BS EN 13165:2001 incorporating amendments 1 and 2.NOTE 2 Additional i
18、nformation for the guidance of users, installers and designers is given in informative Annexes A, B, C, D and E to this standard.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For
19、undated references, the latest edition of the referenced document (including any amendments) applies.BS 3690-2:1989, Bitumens for building and civil engineering Part 2: Specification for bitumens for industrial purposesBS EN 300:1997, Oriented strand boards (OSB) Definitions, classification and spec
20、ificationsBS EN 636:2003, Plywood SpecificationsBS EN 822:1995, Thermal insulating products for building applications Determination of length and widthBS EN 823, Thermal insulating products for building applications Determination of thicknessBS EN 824, Thermal insulating products for building applic
21、ations Determination of squarenessBS EN 825:1995, Thermal insulating products for building applications Determination of flatnessBS EN 826:1996, Thermal insulating products for building applications Determination of compression behaviourBS EN 1426, Methods of test for petroleum and its products Bitu
22、men and bituminous binders Determination of needle penetrationBS EN 1427, Methods of test for petroleum and its products Bitumen and bituminous binders Determination of softening point Ring and ball methodBS EN 1607:1997, Thermal insulating products for building applications Determination of tensile
23、 strength perpendicular to facesBS EN 13165:2001, Thermal insulation products for buildings Factory made rigid polyurethane foam (PUR) products SpecificationBS EN 13169:2001, Thermal insulation products for buildings Factory made products of expanded perlite (EPB) SpecificationBS 4841-3:20062 BSI 20
24、06BS EN 13170:2001, Thermal insulation products for buildings Factory made products of expanded cork (ICB) SpecificationBS EN 13171:2001, Thermal insulation products for buildings Factory made wood fibre (WF) products SpecificationBS EN 13501-1, Fire classification of construction products and build
25、ing elements Part 1: Classification using test data from reaction to fire tests3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this part of BS 4841 the following terms and definitions apply.3.1.1 auto-adhesively bonded facingNOTE These facings can be flexible or rigid.fa
26、cing that becomes bonded onto the PIR or PUR core during the process of creating it3.1.2 separately bonded facingNOTE These facings can be flexible or rigid.facing that is bonded onto the PIR or PUR core in a separate manufacturing process3.1.3 polyisocyanurate productrigid cellular plastics insulat
27、ion material or product with a substantially closed cell structure mainly based on polymers of the isocyanurate type3.1.4 polyurethane productrigid cellular plastics insulation material or product with a substantially closed cell structure mainly based on polymers of the polyurethane type3.2 Symbols
28、dNis the nominal thickness of the product in mmDis the declared thermal conductivity in mW/(mK)Sbis the deviation from squareness in mm/mSmaxis the maximum deviation from flatness in mm/m4 Construction and composition4.1 GeneralThe roofboards shall consist of an insulating core (4.2) with either two
29、 bonded flexible facings (4.3), or two rigid facings (4.4) or one flexible facing (4.3) and one rigid facing (4.4).4.2 Core product typeThe cores of the product type shall be of rigid polyisocyanurate (PIR) or polyurethane (PUR). BSI 2006 3BS 4841-3:20064.3 Flexible facings4.3.1 GeneralBoth flexible
30、 facings of the roofboards shall be either functional or decorative, e.g. paper, metal foil, bitumen coated glass flexible facing (4.3.2), glass/polyethylene/glass facing (4.3.3), mineral coated (4.3.4) or plain glass flexible facings (4.3.5). The two faces need not be identical.4.3.2 Bitumen coated
31、 glass flexible facingBitumen coated glass facings shall be a bitumen coated glass tissue made by coating one face of a minimum 60 g/m2wet process glass tissue with oxidized bitumen which has a softening point in the range of 110 C to 125 C when measured according to BS EN 1427 and a penetration in
32、the range of 1 mm to 1.5 mm when measured in accordance with BS EN 1426.NOTE The bitumen used improves the moisture resistance of the facing and is highly compatible with bitumen roof covering systems.4.3.3 Glass/polyethylene/glass flexible facingThe glass/polyethylene/glass facing shall be based on
33、 two layers of minimum 40 g/m2wet process glass tissue, between which is sandwiched a layer of polyethylene. The polyethylene layer shall be fully covered and adhered to the glass tissue. There shall be no exposed polyethylene face on either the core side or the exposed face.4.3.4 Mineral coated gla
34、ss flexible facingThe mineral coated glass flexible facing shall have a minimum weight of glass tissue between 50 g/m2and 60 g/m2.4.3.5 Plain glass flexible facingThe plain glass flexible facing shall have a minimum weight of glass tissue of 60 g/m2.4.4 Rigid facingsRigid facings shall be either:cor
35、k conforming to BS EN 13170:2001; orperlite conforming to BS EN 13169:2001; orplywood conforming to BS EN 636:2003; orwood fibre conforming to BS EN 13171:2001; orrigid PVC sheet; orrubber sheet; ororientated strand board (OSB) conforming to BS EN 300:1997 Grade OSB/3.NOTE The type of flexible and/o
36、r rigid facings and the degree of their bonding are crucial to ensure good service performance for the laminated roofboards. The degree of bonding, if required, should conform to the requirements given in Annex A when evaluated according to the procedure given in Annex A.BS 4841-3:20064 BSI 20065 Re
37、quirements5.1 Thermal resistance and thermal conductivity The declared thermal conductivity Dof the flexible faced roofboards or core product shall be determined on the product in accordance with BS EN 13165:2001 (including amendments 1 and 2). The declared values of thermal conductivity for the roo
38、fboards shall not exceed 29 mW/mK at 10 C.NOTE See also B.5 for information on roofboard design U values and thermal resistance.5.2 Dimensions 5.2.1 Length and width The length and width of roofboards shall be as given in Table 1 when measured in accordance with BS EN 822:1995.NOTE UK manufacturers
39、usually quote for their products lengths and widths with a maximum deviation of 3 mm for those dimensions up to and including 1200 mm. Those with dimensions greater than 1200 mm may have lower tolerances than are quoted in Table 2.5.2.2 ThicknessThickness, d, shall be determined in accordance with B
40、S EN 823. No test result shall deviate from the nominal thickness, dN, by more than the tolerances given in Table 2 for the declared class. 5.2.3 SquarenessSquareness shall be determined in accordance with BS EN 824. The deviation from squareness on length and width, Sb, shall not exceed 6 mm/m.Tabl
41、e 1 Tolerances for lengths and widthsDimensions mmTolerances mm4000 15Table 2 Classes for thickness tolerancesDimensions in millimetresClass Nominal thicknesses75TolerancesT1 3 4 +6, 3T2 2 3 +5, 2T3 1.5 1.5 1.5 BSI 2006 5BS 4841-3:20065.2.4 FlatnessFlatness shall be determined in accordance with BS
42、EN 825:1995. The maximum deviation from flatness, Smax, shall not exceed the values given in Table 3.5.3 Compressive strength5.3.1 Normal to the major plane of the boardWhen tested in accordance with BS EN 826:1996 the minimum compressive strength of the board shall be 150 kPa, which corresponds to
43、the designation CS (10Y) 150 given in BS EN 13165:2001 (including amendments 1 and 2).NOTE 1 See Figure 1.NOTE 2 See B.1 for information on heavy duty roofs.NOTE 3 Experience has shown that it is essential for satisfactory fitness for purpose that roofboards conform to the imposed loadbearing requir
44、ements of BS 6399-1:1996, 6.2 and 6.3 when mounted on a troughed metal substrate, where the appropriate trough opening is determined from the roofboard thickness (see Table B.1).5.3.2 Parallel to the major plane of the boardWhen tested in accordance with BS EN 826:1996 the minimum compressive streng
45、th of the core shall be 100 kPa, which corresponds to the designation CS (10Y) 100 given in BS EN 13165:2001 (including amendments 1 and 2).NOTE See Figure 1.Table 3 Deviation from flatnessFull size product length mFull size product area m2Deviation from flatness Smax mm5 2.505 0.755 5 0.755 10BS 48
46、41-3:20066 BSI 2006Figure 1 Diagram to explain orientations for compressive strength measurements5.4 Dimensional stability under specified temperature and humidity conditionsWhen tested in accordance with the procedure in BS EN 13165:2001, 4.2.6 (including amendments 1 and 2) the roofboards shall ha
47、ve a performance of at least DS(TH)5.NOTE Experience has shown that in the UK conditions where hot bitumen may be used for bonding the roofing membrane to the roofboards, in order to ensure fitness for purpose, the dimensional stability of the roofboard should be such that its performance satisfies
48、the recommendations of Annex A.5.5 Tensile strength normal to the major plane of the boardWhen tested in accordance with BS EN 1607:1997 roofboards shall have a tensile strength of at least TR60 (60 kPa).5.6 Reaction to fire When classified by the procedure given in BS EN 13501-1 the roofboards shal
49、l have a minimum classification of class F.NOTE 1 Class F is “No performance determined”.NOTE 2 The fire performance of roofboards in isolation is not significant since the UK Building Regulations Approved Document B 1 requires testing of the complete roofing assembly, of which the roofboard forms an internal part. These assemblies are subject to the requirements of the external fire performance, which is determined by testing according to BS 476-3:2004.NOTE 3 It is intended that
