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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 747:2000 ICS 91.060.20
2、 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Reinforced bitumen sheets for roofing Specification Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been pre
3、pared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 April 2000 BSI 04-2000 First published as BS 747 July 1937 Second edition September 1952 Third edition August 1961 Fourth edi
4、tion June 1968 Fifth edition as BS 747-2 October 1970 Sixth edition as BS 747 January 1977 Seventh edition March 1994 Eighth edition The following BSI references relate to the work on this standard: Committee reference B/546 Draft for comment 98/108584 DC ISBN 0 580 33127 X BS 747:2000 Amendments is
5、sued since publication Amd. No.DateComments Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/546, Flexible sheets for water and water vapour control, upon which the following bodies were represented: Association of Briti
6、sh Roofing Felt Manufacturers Association of Building Component Manufacturers British Flat Roofing Council Construction Confederation Consumer Policy Committee of BSI Department of the Environment, Transport and the Regions (Represented by BSI) Department of the Environment, Transport and the Region
7、s (Construction Directorate) Flat Roofing Alliance Mastic Asphalt Council Ltd. National Federation of Roofing Contractors National House Building Council Royal Institute of British Architects The following bodies were also represented in the drafting of the standard, through subcommittees and panels
8、: Builders Merchants Federation London Chamber of Commerce Inc. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 747:2000 BSI 04-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1
9、 2Normative references1 3Class 1 Bitumen sheets (fibre base)1 4Class 3 Bitumen sheets (glass fibre base)2 5Class 4 Sheathing felts4 6Class 5 Bitumen sheets (polyester base) with oxidized bitumen coating5 Annex A (informative) Uses of BS 747 products8 Annex B (normative) Procedure for sampling and se
10、lection of specimens of roofing sheets and methods of determining the masses of constituent materials8 Annex C (normative) Procedure for the selection and testing of samples of base material9 Annex D (normative) Procedures for testing bitumen polyester sheets10 BibliographyInside back cover Table 1
11、Masses per unit area of components and lengths of rolls of class 1 bitumen sheets (fibre base)2 Table 2 Class 3 bitumen sheets (glass fibre base) Composition and roll lengths2 Table 3 Nominal masses of class 4 sheathing felts4 Table 4 Physical test requirements of polyester base5 Table 5 Class 5 bit
12、umen polyester sheets Composition7 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 04-2000 BS 747:2000 Foreword This British Standard has been prepared by Technical Committee B/546. It supersedes BS 747:
13、1994, which is withdrawn. Traditionally, products covered by this standard have been known as felt. Whilst the term remains valid in respect of class 4 products, the opportunity has been taken in this revision to change the title of the standard and of class 1, 3 and 5 products to the more accurate
14、term reinforced bitumen sheets for roofing. This term also accords with titles of draft European Standards for these products. This edition introduces changes which: improve the performance of type 3E mineral surface product by increasing the mass of the glass base and the amount of the bitumen coat
15、ing; increase the number of class 5 products to include the ranges of polyester products in common use; introduce changes to the class 4 sheathing felts to reflect those now commonly and successfully used in practice. The following types of pre-formed base roofing sheets are covered in this edition
16、of BS 747. Types of pre-formed base roofing sheetsFibre baseAsbestos base Glass fibre base Polyester base Fine mineral surfaced sheet, e.g. fine sand, talcum etc.3B5B and 5U Granule surfaced sheet, e.g. slate granite or ceramic3E5E Reinforced sheet1F Venting base layer3G A roofing sheet consists ess
17、entially of matted fibre rendered partially or completely impervious to water by treatment with bituminous materials. According to the purpose and type of roofing sheet required, the fibres may be derived from various sources, most commonly vegetable (e.g. cotton, jute, flax, wood pulp), mineral (e.
18、g. glass), man made fibres (e.g. polyester) or a mixture of these. Unproofed sheets are made in various thicknesses, masses, textures and mechanical strengths, depending partly upon the physical nature of the fibre. Whilst some are close textured and tough, others are of open texture and low strengt
19、h, although treatment with the proofing generally increases the mechanical strength. The types of proofing materials, blended to give the required properties, include bitumens derived from petroleum oils. Class 1, 3 and 5 products are manufactured by passing the untreated base through a tank contain
20、ing a saturating material (bitumen), which is maintained in a hot fluid condition. Any excess saturant is removed by passing through rollers. These products are then coated with a more highly weather resistant material consisting of bitumen and a mineral filler. (The saturation process for the light
21、weight polyester and glass bases is optional as long as the material is sufficiently saturated during the coating process.) The surface of the coated sheet is then covered with a surfacing material, appropriate to the type of product, which prevents sticking in the roll and which can also provide a
22、decorative and protective finish. Class 4 sheathing felts are not manufactured from a pre-formed base as with class 1, 3 and 5 products but are manufactured from comparatively long staple fibres, which are formed as a loose open batt on the production machine. This batt is immediately treated with t
23、he impregnating materials derived from petroleum oils or certain wood pitches and resins which bond the fibres together. These felts are used mainly as underlays for other roofing materials such as mastic asphalt and metal roof coverings. Licensed Copy: London South Bank University, London South Ban
24、k University, Fri Dec 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-2000iii BS 747:2000 Class 5 polyester-based products have improved performance capability, which is derived from the improved reinforcing properties and greater mechanical strength of the polyester base. The final pr
25、operties of the bitumen polyester sheet are related to the mass/area ratio of the sheet, the composition of the base (polyester fibre/binder content) and the method of production. The four masses of polyester base which are in common use are now included in this standard, the properties of which are
26、 specified in Table 5. The particular technical benefits conferred by bitumen polyester roofing sheets are: an improvement in the capability of the built up roof covering to accommodate deformation or movement; an increase in the puncture and general mechanical damage resistance of the covering; a h
27、igher nail holding or nail anchorage capability by virtue of the increased tear resistance of the polyester base. Recommendations for the application of these products are given in BS 5534-1, BS 8000-4, BS 8204-5, BS 8217, BS 8218, CP 143-12 and CP 143-15. Annex A is informative. Annexes B, C and D
28、are normative. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This docu
29、ment comprises a front cover, an inside front cover, pages i to iv, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri De
30、c 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 04-20001 BS 747:2000 1)Marking BS 747:2000 on or in relation to a product represents a manufact
31、urers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity. 1 Scope
32、This British Standard specifies requirements for reinforced bitumen roofing sheets intended for use in the British Isles and countries with similar climate. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of thi
33、s British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies. BS 410, Specification for test sieves. BS 2000-49, Methods of test for petroleum and
34、its products Determination of needle penetration of bituminous material. BS 2000-58, Methods of test for petroleum and its products Determination of softening point of bitumen Ring and ball method. BS 3690-2, Bitumens for building and civil engineering Specification for bitumens for industrial purpo
35、ses. BS 5284:1993, Methods of sampling and testing mastic asphalt used in building and civil engineering. 3 Class 1 Bitumen sheets (fibre base) 3.1 General The products in this class comprise: type 1F reinforced bitumen sheet; type 1F reinforced bitumen sheet, aluminium faced. Minimum masses for the
36、 base and bitumen components of class 1 bitumen sheets shall be as given in Table 1. 3.2 Requirements for constituent materials 3.2.1 Base The base shall consist of animal fibres or vegetable fibres made into a close-textured absorbent sheet of fibre. 3.2.2 Saturating material The saturating materia
37、l shall consist of bitumen conforming to BS 3690-2 having a penetration within the range 60 to 230 at 25 8C when tested in accordance with BS 2000-49. 3.2.3 Coating material The coating material shall have a softening point (ring and ball test) within the range 80 8C to 120 8C when tested in accorda
38、nce with BS 2000-58 and shall consist of oxidized bitumen conforming to BS 3690-2 which may be stabilized with finely divided mineral filler. The proportion of stabilizing mineral filler shall not exceed 40 % by mass of the coating material. 3.2.4 Mineral filler The mineral filler shall consist of f
39、inely divided mineral matter of which not less than 99 % by mass passes a 212 mm mesh sieve conforming to BS 410. 3.2.5 Surfacing material The surfacing material shall consist of a fine mineral material, e.g. sand, talcum etc., or other suitable material according to the type of sheet. 3.3 Type 1F r
40、einforced bitumen sheets 3.3.1 Description Type 1F sheet shall comprise a bitumen-saturated and coated fibre base combined with a layer of jute hessian embedded in the coating on one side of the base so as to reinforce and strengthen the sheet. The sheet shall be coated with a fine surfacing materia
41、l to prevent the product sticking in the roll. The presence of the hessian shall be obvious on inspection. Type 1F sheet shall also be manufactured with an aluminium foil face on the hessian-reinforced side to provide a heat-reflecting under-slating sheet. NOTEUses for which type 1F sheet is suitabl
42、e are described in annex A. 3.3.2 Reinforcement The jute hessian used to reinforce the sheet shall have a nominal mass per unit area of not less than 110 g/m2. 3.3.3 Mass The nominal mass per unit area of type 1F sheet shall be 15.0 kg per 10 m2exclusive of wrappings or accessories. The mass of roll
43、 determined by the selection procedure in annex B (see B.1) shall be not less than 95 % of that calculated from the nominal mass per unit area. Masses per unit area of components and their corresponding values shall be as shown in Table 1 when determined by the method in B.3. 3.3.4 Standard packages
44、 Type 1F sheets shall be marketed in rolls 1 m wide, in lengths of 15 m. The packages shall be marked with the name of the manufacturer, the number and date of this British Standard, i.e. BS 747:20001), the type of sheet and the nominal length and width of the roll. Licensed Copy: London South Bank
45、University, London South Bank University, Fri Dec 08 14:47:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 04-2000 BS 747:2000 Table 1 Masses per unit area of components and lengths of rolls of class 1 bitumen sheets (fibre base) Type of sheetNominal mass per unit area Nominal length of roll Nom
46、inal mass per unit area of fibre base Masses per unit area obtained by analysis Base min.Bitumen content min. Surfacing material (nominal) kg/10 m2mg/m2g/m2g/m2g/m2 1F1515160 (fibre)140550450 reinforced bitumen 110 (hessian)90 1F1315160 (fibre)140550250 reinforced bitumen, aluminium faced 110 (hessi
47、an)90 Table 2 Class 3 bitumen sheets (glass fibre base) Composition and roll lengths Type of sheetNominal mass per unit area Nominal length of roll Nominal mass per unit area of base Mass per unit area obtained by analysis Base min.Total bitumen content Surfacing material nominal min. kg/10 m2mg/m2g
48、/m2g/m2g/m2 3B fine material surfaced bitumen glass fibre 18206055780450 3E granule surfaced bitumen glass fibre 3210100908501 000 (granules) 250 (fine surfacing) 3G bitumen glass fibre venting base layer 261060a55a690a1 000a(granules) 250a(fine surfacing) a Excluding effect of perforations. 3.3.5 C
49、olour code Type 1F sheet shall be provided with a single continuous strip of white surfacing along one longitudinal edge of the roll so as to be visible when unrolled. The white strip shall provide sufficient contrast with the surfacing material so as to be easily distinguished. 4 Class 3 Bitumen sheets (glass fibre base) 4.1 General The products in this class comprise the following types: type 3B: fine material surfaced bitumen glass fibre sheet; type 3E: granule surfaced bitumen glass fibre sheet; type