BS 8747-2007 Reinforced bitumen membranes (RBMs) for roofing – Guide to selection and specification.pdf
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1、BS 8747:2007 Reinforced bitumen membranes (RBMs) for roofing Guide to selection and specification ICS 91.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Licensed copy:PONTYPRIDD COLLEGE, 05/01/2008, Uncontrolled Copy, BSI Publishing and copyright inform
2、ation The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 50900 1 The following BSI references relate to the work on this standard: Committee reference B/546/1 Draft for comment 06/30058801 DC Publication history First published Ju
3、ne 2007 Amendments issued since publication Amd. no.DateText affected BS 8747:2007 Licensed copy:PONTYPRIDD COLLEGE, 05/01/2008, Uncontrolled Copy, BSI w w w . b z f x w . c o m BSI 2007i BS 8747:2007 Contents Foreword ii Introduction CEN test methods referenced in this standard 1 1Scope 1 2Normativ
4、e references 2 3Terms and definitions 2 4Membrane selection guidelines 5 5System selection 16 6Bonding and installation of an RBM 18 Annexes Annex A (informative) CE marking information for an RBM product 20 Annex B (informative) Guide to specifying RBM equivalent to Type 1F or Type 5U reinforced bi
5、tumen roofing underlay 21 Annex C (informative) Guide to specifying RBM equivalent to Type 3G glass-fibre reinforced bitumen perforated venting layer 23 Annex D (informative) Worked examples 24 Bibliography 32 List of tables Table 1 Tensile strength of membrane classes 12 Table 2 Resistance to impac
6、t 12 Table 3 Resistance to static loading 12 Table 4 Combinations of D subclass and L subclass to give P class 12 Table 5 Membrane classification by performance requirement 14 Table 6 Comparison between BS 747 membranes and the SNPN system 15 Table 7 Flow chart for system selection Warm deck roofs 1
7、6 Table 8 Flow chart for system selection Inverted warm roofs 18 Table B.1 Mass per units area for constituents of Type 1F and Type 5U RBMs 22 Table C.1 Mass per units area for constituents of Type 3G RBMs 24 Summary of pages This document comprises a front cover, an inside front cover, pages i and
8、ii, pages 1 to 32, an inside back cover and a back cover. Licensed copy:PONTYPRIDD COLLEGE, 05/01/2008, Uncontrolled Copy, BSI w w w . b z f x w . c o m BS 8747:2007 ii BSI 2007 Foreword Publishing information This British Standard is published by BSI and came into effect on 29 June 2007. It was pre
9、pared by Subcommittee B/546/1, Reinforced bitumen membranes. A list of organizations represented on this committee can be obtained on request to its secretary. Relationship with other publications Some products included within this Standard used to be commonly referred to as roofing “felts”, and wer
10、e covered by BS 747:2000. The new European product standard BS EN 13707, which will replace BS 747, refers to these as “flexible bitumen sheets for roof waterproofing”. This could be confusing to the UK construction industry. Therefore, the title of this guide reflects the current terminology used i
11、n the UK and in the Code of Practice, BS 8217. These products are now referred to as “Reinforced Bitumen Membranes (RBMs) for Roofing”. In flat roofing applications, these materials are almost always used with a fully supporting substrate. The exception is on a profiled metal deck, where the top fla
12、ts (crowns) of the profile are used for support. General flat roofing design is covered in BS 6229. Specific roof design and installation of these membranes is covered in BS 8217. BS 8747 gives guidance on the selection and use of RBMs, including those specified in BS EN 13707. Guidance in specifyin
13、g RBMs equivalent to those specified in BS 747:2000 (but not covered by BS EN 13707) is included in Annexes B and C. Publications are also available that give useful advice on construction safety (see Bibliography). Information about this document This guide provides “primary advice” to the specifie
14、r with respect to the production of an effective roof, and is intended as a link document between the material product standard and the final contract specification. This British Standard takes the form of guidance and recommendations. It cannot be quoted as a specification, and claims of compliance
15、 to it cannot be made. NOTEIt has been assumed in the drafting of this guide that the design and construction of flat roofs is entrusted to appropriately qualified and competent people. It has also been assumed that the building owner will adopt the recommendations in respect of planned inspection a
16、nd maintenance of a roof during service. Contractual and legal considerations This 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.
17、Licensed copy:PONTYPRIDD COLLEGE, 05/01/2008, Uncontrolled Copy, BSI w w w . b z f x w . c o m BSI 20071 BS 8747:2007 Introduction CEN test methods referenced in this standard The overall aim of the Construction Products Directive (CPD) 1 is to reduce barriers to trade throughout the European Econom
18、ic Area. The CPD has, as an ideal, the concept of performance related test methods. The relationship between the results of test methods and the performance on a roof for reinforced bitumen membranes (RBMs) has not been proven, thus it should not be assumed that the results of such tests indicate ac
19、curately the in-service performance of the membrane(s) tested. The test methods in BS EN 13707 have been developed in response to product characteristics identified from the Building Regulations 2 or their counterparts in the various Member States. Some of these are required only for installation of
20、 the product. The CEN test methods and product standards have been developed by a committee of experts from Member States. These test methods were based on current standards such as ISOs where possible but in most cases the scope of existing standards did not coincide entirely with the scope of the
21、CEN standards. Roof waterproofing is an example of this. Most of the test methods are therefore new and there is no history of past values to rely upon for a given product. CEN product standards also stipulate whether the manufacturer declares a value for a given test method, together with a declare
22、d tolerance, or states a manufacturers limiting value. BS 747:2000 was a recipe standard. As such it was known in the roofing industry that rag-based bitumen felts did not perform as well as polyester-based products. Because of this, it was easy for a specifier to use a BS 747:2000 Type 3 for say ga
23、rages or sheds, and BS 747:2000 Type 5 for roofs over offices and computer installations. This will not be possible with BS EN 13707, because it gives no indication as to what values, as a result of carrying out tests, are required or appropriate for given end uses. This committee has selected, thro
24、ugh expert knowledge and a limited amount of testing, those test methods which it is believed are most suitable and relevant to performance on a roof, and has assigned threshold values which can be used to conveniently group the products into bands of performance. The worked examples are also based
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