1、BS 4841-4:2006Rigid polyisocyanurate (PIR) and polyurethane (PUR) products for building end-use applications Part 4: Specification for laminated boards (roofboards) with auto-adhesively or separately bonded facings for use as roofboard thermal insulation under non-bituminous single-ply roofing membr
2、anesICS 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 48192 1The following BSI references relate to
3、 the work on this standard:Committee reference PRI/72/4Draft for comment 05/30124175 DCPublication historyFirst published, July 2006Amendments issued since publicationAmd. no. Date Text affectedBS 4841-4:2006 BSI 2006 iBS 4841-4:2006ContentsForeword ii1 Scope 12 Normative references 13 Terms, symbol
4、s and definitions 24 Construction and composition 25 Requirements 36 Designation 67 Marking 7AnnexesAnnex A (informative) Method for the determination of areas of unbonded facings 8Annex B (informative) Information for users and designers 10Annex C (informative) Reaction to fire performance of PIR a
5、nd PUR products and recommendations regarding their use 11Annex D (informative) Information on the installation of roofboards into single-ply roofs 12Bibliography 13List of figuresFigure 1 Diagram to explain orientations for compressive strength measurements 5Figure A.1 Determination of area(s) of u
6、nbonded facings: cutting and marking of the test specimen 9List of tablesTable 1 Tolerances for lengths and widths 4Table 2 Classes for thickness tolerances 4Table 3 Thickness tolerances 4Table 4 Deviation from flatness 5Table B.1 Relationships between roofboard thickness and metal deck trough openi
7、ngs 11Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 13, an inside back cover and a back cover.ii BSI 2006BS 4841-4:2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 20 July 2006. It was prep
8、ared by Subcommittee PRI/72/4, Polyurethane, under the authority of Technical Committee PRI/72, Rigid cellular materials.Information about this documentThis British Standard has been introduced to specify the requirements needed to ensure fitness for purpose of those polyurethane and polyisocyanurat
9、e cored laminated insulation boards (roofboards) with auto-adhesively or separately bonded flexible and/or rigid facings used in the single-ply roofing application in the United Kingdom. The requirements have been written so that products conforming to BS 4841-4 also conform to BS EN 13165:2001 (inc
10、luding amendments 1 and 2) whilst satisfying the specified minimum performance levels of the properties included in the current standard.Attention is drawn to BS 8217:2005 which describes the recommended practice for laying the roofboards conforming to this standard into roof structures, and their w
11、eatherproofing to maximise their service performance after installation.Additional information for the guidance of users, installers and designers is given in informative Annexes A, B, C and D to this standard.The other parts of BS 4841 have been revised to reflect recent technical advances and to t
12、ake into account the European Standard BS EN 13165:2001 (including amendments 1 and 2).Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explan
13、ation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal obligationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Complian
14、ce with a British Standard cannot confer immunity from legal obligations. BSI 2006 1BS 4841-4:20061 ScopeThis British Standard specifies requirements for polyisocyanurate (PIR) and polyurethane (PUR) cored thermally insulated laminated boards (roofboards) with auto-adhesively or separately bonded fl
15、exible and/or rigid facings, for use in roofs under non-bituminous single-ply roofing membranes. This specification is also applicable to roofboards with OSB or plywood facings bonded in place after the initial product has been created (see Clause 4).NOTE 1 Additional information for the guidance of
16、 users, installers and designers is given in informative Annexes A, B, C, and D to this standard.NOTE 2 Because of the changes introduced into this standard, products conforming to this standard will also conform to BS EN 13165:2001 (including amendments 1 and 2).2 Normative referencesThe following
17、referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS EN 300:1997, Oriented strand boards (OSB) Definitions, classi
18、fication and specificationsBS 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 825:1995, Thermal insulating produ
19、cts 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 Bitumen and bituminous binders Determination of needle penetrationBS EN 1427,
20、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 strength perpendicular to facesBS EN 13165:2001, Thermal insulation produ
21、cts for buildings Factory made rigid polyurethane foam (PUR) products SpecificationBS EN 13170:2001, Thermal insulation products for buildings Factory made products of expanded cork (ICB) SpecificationBS EN 13501-1, Fire classification of construction products and building elements Part 1: Classific
22、ation using test data from reaction to fire testsBS 4841-4:20062 BSI 20063 Terms, symbols and definitions3.1 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.facing t
23、hat 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 insulation ma
24、terial 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 SymbolsdNnomi
25、nal thickness of the product in mmDdeclared thermal conductivity in mW/(mK)Sbdeviation from squareness in mm/mSmaxmaximum deviation from flatness in mm/m4 Construction and composition4.1 GeneralThe insulation boards shall consist of an insulating core (4.2) with either two bonded flexible facings (4
26、.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).4.3 Flexible facings4.3.1 GeneralBoth flexible facings of the roofboards shall be either function
27、al or decorative, e.g. paper, metal foil, bitumen coated glass flexible facing BSI 2006 3BS 4841-4:2006(4.3.2), glass/polyethylene/glass facing (4.3.3), mineral coated (4.3.4) or plain glass flexible facing (4.3.5).NOTE Both facings need not be identical.4.3.2 Bitumen coated glass flexible facingThe
28、 bitumen coated glass facing 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 the range of 1 mm to 1
29、.5 mm when measured in accordance with BS EN 1426.NOTE The bitumen used improves the moisture resistance of the facing.4.3.3 Glass/polyethylene/glass flexible facingThe glass/polyethylene/glass facing shall be based on two layers of minimum 40 g/m2wet process glass tissue, between which is sandwiche
30、d 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 glass flexible facingThe mineral coated glass flexible facing shall have a minimum we
31、ight 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:plywood conforming to BS EN 636:2003 service class 3, exterior conditions; or orientated str
32、and board (OSB) conforming to BS EN 300:1997 Grade 3; orcork conforming to BS EN 13170:2001; orany flexible or rigid rubber sheet.NOTE The type of facings and the degree of their bonding are crucial to ensure good service performance for the laminated insulation boards. The degree of bonding, if req
33、uired, should conform to the recommendations given in Annex A when evaluated according to the procedure given in Annex A.5 Requirements5.1 Thermal resistance and thermal conductivity The declared thermal conductivity Dof the flexible faced boards or core product shall be determined in accordance wit
34、h BS EN 13165:2001 (including amendments 1 and 2). The declared values shall not exceed 29 mW/mK at 10 C.BS 4841-4:20064 BSI 2006NOTE See also B.7 for information on roofboard design U values and thermal resistance.5.2 Dimensions5.2.1 Length and width The length and width of insulation boards shall
35、be as given in Table 1 when measured in accordance with BS EN 822:1995.NOTE UK manufacturers 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 tha
36、n are quoted in Table 2.5.2.2 ThicknessThickness, d, shall be determined in accordance with BS 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. NOTE UK manufacturers and producers have voluntarily accepted the v
37、alues in Table 3 which are generally lower than those given for Class T2 in Table 2. 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.Table 1 Tolerances for lengths and widthsDimensionsmmTolera
38、ncesmm4000 15Table 2 Classes for thickness tolerances Dimensions in millimetresClass Nominal thicknesses75TolerancesT2 2 3 +5, 2T3 1.5 1.5 1.5Table 3 Thickness tolerancesNominal thickness mmTolerances mm20 to 30 1.531 to 49 2.0J50 3.0 BSI 2006 5BS 4841-4:20065.2.4 FlatnessFlatness shall be determine
39、d in accordance with BS EN 825:1995. The maximum deviation from flatness, Smax, shall not exceed the values given in Table 4.5.3 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 kP
40、a, which corresponds to 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 See also B.4 for information on robustness.NOTE 4 Experience has shown that it is essential for satisfactory fit
41、ness for purpose that roofboards conform to the imposed loadbearing requirements 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).Figure 1 Diagram to explain orientations for comp
42、ressive strength measurementsTable 4 Deviation from flatnessFull size product lengthmFull size product aream2Deviation from flatnessmm5 2.505 0.755 5 0.75510Normal to the major plane of the board (150 kPa)Parallel to the major plane of the board (100 kPa)Major plane of the boardBS 4841-4:20066 BSI 2
43、0065.3.2 Parallel to the major plane of the boardWhen tested in accordance with BS EN 826:1996 the minimum compressive strength 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 1.5.4 Dimensional
44、stability under specified temperature and humidity conditionsWhen tested in accordance with the procedure in BS EN 13165:2001, 4.2.6, the insulation boards shall have a performance of at least DS(TH)5.5.5 Tensile strength normal to the major plane of the boardWhen tested in accordance with BS EN 160
45、7:1997 the insulation boards shall have a tensile strength of not less than (60 kPa).5.6 Reaction to fire The roofboards shall have a minimum classification of class F when classified by the procedure given in BS EN 13501-1. NOTE 1 Class F is also “No performance determined”.NOTE 2 The fire performa
46、nce of roofboards in isolation is not significant since the UK Building Regulations Approved Document B 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 determ
47、ined by testing according to BS 476-3:2004.NOTE 3 It is intended that BS 476-3:2004 will become the fourth method in the DD ENV 1187.NOTE 4 It should be noted therefore that the heat source used during testing according to BS 476-3:2004 is applied directly to the covering roofing membrane (see B.2).
48、 However, it is required under the CPD for a fire performance to be declared for the product in isolation when it is placed on the market. Accordingly, the way of satisfying this requirement is given in 5.6.NOTE 5 For further information on the reaction to fire performance of PIR or PUR insulating p
49、roducts see Annex C.6 DesignationNOTE The use of BS EN 13165 in this designation should be interpreted as including amendments 1 and 2.The boards shall be given the following designation:“BS 4841-4:2006/BS EN 13165: XX: Y: W”where:XX is the thermal conductivity in mW/mK (see 5.1);Y is the reaction to fire classification (see 5.6);W is the core type, either PIR or PUR (see 4.2). BSI 2006 7BS 4841-4:20067 MarkingThe product, packages or invoices shall be marked with at least the following inf
