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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: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+0
2、0:00 2007, Uncontrolled Copy, (c) BSI Publishing and copyright information 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 Dr
3、aft for comment 06/30058801 DC Publication history First published June 2007 Amendments issued since publication Amd. no.DateText affected BS 8747:2007 Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007i
4、BS 8747:2007 Contents Foreword ii Introduction CEN test methods referenced in this standard 1 1Scope 1 2Normative 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 fo
5、r an RBM product 20 Annex B (informative) Guide to specifying RBM equivalent to Type 1F or Type 5U reinforced bitumen 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 exampl
6、es 24 Bibliography 32 List of tables Table 1 Tensile strength of membrane classes 12 Table 2 Resistance to impact 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 Comp
7、arison between BS 747 membranes and the SNPN system 15 Table 7 Flow chart for system selection Warm deck roofs 16 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 constituent
8、s of Type 3G RBMs 24 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 32, an inside back cover and a back cover. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00 2007, Uncontrolled Copy,
9、(c) BSI 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 prepared by Subcommittee B/546/1, Reinforced bitumen membranes. A list of organizations represented on this committee can be obtained on request to
10、its secretary. Relationship with other publications Some products included within this Standard used to be commonly referred to as roofing “felts”, and were 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 f
11、or roof waterproofing”. This could be confusing to the UK construction industry. Therefore, the title of this guide reflects the current terminology used in 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 r
12、oofing applications, these materials are almost always used with a fully supporting substrate. The exception is on a profiled metal deck, where the top flats (crowns) of the profile are used for support. General flat roofing design is covered in BS 6229. Specific roof design and installation of thes
13、e 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 specifying 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 availa
14、ble that give useful advice on construction safety (see Bibliography). Information about this document This guide provides “primary advice” to the specifier with respect to the production of an effective roof, and is intended as a link document between the material product standard and the final con
15、tract specification. This British Standard takes the form of guidance and recommendations. It cannot be quoted as a specification, and claims of compliance 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 appro
16、priately qualified and competent people. It has also been assumed that the building owner will adopt the recommendations in respect of planned inspection and maintenance of a roof during service. Contractual and legal considerations This publication does not purport to include all the necessary prov
17、isions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 200
18、71 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 Economic Area. The CPD has, as an ideal, the concept of performance related test methods. The relationship b
19、etween 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 accurately the in-service performance of the membrane(s) tested. The test methods in BS EN 13707 have be
20、en 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 the product. The CEN test methods and product standards have been developed by a committee of experts
21、 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 CEN standards. Roof waterproofing is an example of this. Most of the test methods are therefore new an
22、d 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 declared tolerance, or states a manufacturers limiting value. BS 747:2000 was a recipe standard. As such it w
23、as 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 garages or sheds, and BS 747:2000 Type 5 for roofs over offices and computer installations. This will no
24、t 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, through expert knowledge and a limited amount of testing, those test methods which it is believed are most
25、 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 upon industry knowledge and experience. Table 5 correlates end use and substrate with membrane type an
26、d choice. 1 Scope This British Standard gives guidance to assist the selection and specification of a system of appropriate layer(s) of reinforced bitumen membrane (RBM) for each flat and/or sloping roofing project, tailored to the particular requirements of that project. It provides a grouping syst
27、em to assist the specifier, utilizing material properties as tested according to BS EN 13707. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 8747:2007 2 BSI 2007 2 Normative references The following referen
28、ced 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 476-3:2004, Fire tests on building materials and structures Part 3:
29、 Classification and method of test for external fire exposure to roofs BS 6100-1.3.2:1989, Glossary of building and civil engineering terms Part 1: General and miscellaneous Section 1.3: Parts of construction works Subsection 1.3.2: Roofs and roofing BS 6229:2003, Flat roofs with continuously suppor
30、ted coverings Code of practice BS 8217:2005, Reinforced bitumen membranes for roofing Code of practice BS EN 12311-1:2000, Flexible sheets for waterproofing Determination of tensile properties Part 1: Bitumen sheets for roof waterproofing BS EN 12691: 2006, Flexible sheets for waterproofing Bitumen,
31、 plastic and rubber sheets for roof waterproofing Determination of resistance to impact BS EN 12730:2001, Flexible sheets for waterproofing Bitumen, plastic and rubber sheets for roof waterproofing Determination of resistance to static loading BS EN 13707:2005, Flexible sheets for waterproofing Rein
32、forced bitumen sheets for roof waterproofing Definitions and characteristics 3 Terms and definitions For the purposes of this British Standard, the definitions given in BS 6100-1.3.2:1989 and those following shall apply. These definitions align with those used in other pertinent UK standards; they m
33、ight differ slightly from those included within European Standards. This standard introduces and confirms a new primary abbreviation/acronym as mentioned in the foreword: RBMs will henceforth be defined as “reinforced bitumen membranes”. 3.1built-up reinforced bitumen membrane built-up RBM generally
34、, two or more layers of reinforced bitumen membrane, fastened to the substrate, bonded together with sealed joints to form a continuous waterproof covering 3.2single-layer reinforced bitumen membrane single-layer RBM specifically designed bituminous single-layer systems with sealed joints, forming a
35、 continuous waterproof covering, and installed according to the manufacturers specific instructions Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20073 BS 8747:2007 3.3access roof roof used to provide acc
36、ess to plant or equipment 3.4base layer preparatory layer layer of reinforced bitumen membrane which is laid first 3.5bonding bitumen oxidized bitumen, or other suitable bitumen compound melted and used hot as a bonding agent 3.6capsheet uppermost layer of reinforced bitumen membrane which is self-f
37、inished, i.e. incorporates a protective finish (e.g. mineral or foil-faced) 3.7carrier material incorporated into or onto the factory-made bitumen membrane to ensure its stability and/or mechanical resistance 3.8cold deck roof cold roof roof where the principal thermal insulation is placed at or imm
38、ediately above the ceiling, resulting in the roof covering and structural deck being substantially colder in winter than the interior of the building NOTEGenerally, the cold deck flat roof is no longer recommended, due to the difficulty in providing an effective vapour control layer at ceiling level
39、, the limitations of providing adequate ventilation above the insulation to prevent condensation, and the associated thermal losses. 3.9detailing capsheet capsheet used on detail works and upstands, offering more flexibility for forming these 3.10full bonding use of a continuous coat of bonding bitu
40、men (or other approved adhesive), or torch application, to fully adhere a layer of reinforced bitumen membrane 3.11gritting solution bitumen compound, formulated to bond a layer of site-applied chippings to the surface of the top layer 3.12intermediate layer any layer of reinforced bitumen membrane
41、which is applied between the base layer, and the top layer (or capsheet) 3.13inverted roof upside-down roof protected membrane roof roof where the principal thermal insulation is placed above the roof covering, resulting in the roof covering, structural deck and ceiling being at a temperature close
42、to that of the interior of the building NOTEGenerally the principal insulation is secured by ballast, however proprietary lightweight systems are available which do not rely on separate ballast. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00
43、2007, Uncontrolled Copy, (c) BSI BS 8747:2007 4 BSI 2007 3.14manufacturers declared value MDV value declared by the manufacturer accompanied by a declared tolerance 3.15manufacturers limiting value MLV value stated by the manufacturer to be met during testing, which can be a minimum or a maximum val
44、ue according to statements made under product characteristics within a standard 3.16partial bonding use of a controlled and regular quantity of bonding bitumen (or other approved adhesive) or torch application, so as to provide adhesion over a proportion of the total area of the substrate 3.17roof d
45、eck part of the roof construction, which supports the waterproofing system, including as appropriate the vapour control layer and insulation board(s) 3.18substrate surface upon which a built-up reinforced bitumen membrane (RBM) is laid 3.19tapered insulation thermal insulation boards of varying thic
46、kness, designed and pre-cut or pre-formed to create or augment drainage falls when laid in a prescribed pattern 3.20terrace roof flat roof for use as an amenity area, usually having a specialist, separate, protective surface finish 3.21top layer uppermost layer of reinforced bitumen membrane, which
47、will require the application of separate surface protection 3.22vapour control layer VCL construction material (usually a reinforced bitumen membrane) that substantially reduces the transfer of water vapour through the roof build-up NOTEThe performance of a vapour control layer is dependent upon the
48、 material, workmanship and buildability. The material chosen for a specific building should be suitable for its internal conditions. 3.23warm deck roof warm roof roof where the principal thermal insulation is placed above the deck and a vapour control layer and immediately below the roof covering, r
49、esulting in the structural deck and ceiling being at a temperature close to that of the interior of the building Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20075 BS 8747:2007 4 Membrane selection guidelines 4.1General The primary reference for flat roof design is BS 6229, and the code of practice for RBM roofing is BS 8217, which should be consulted in conjunction with this Guide, for th
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