1、BSI Standards PublicationBS 8605-1:2014External timber claddingPart 1: Method of specifyingPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2014Published by BSI Standards Limited 2014
2、ISBN 978 0 580 81760 1ICS 79.080The following BSI references relate to the work on this document:Committee reference B/543Draft for comment 14/30277336 DCPublication historyFirst published December 2014Amendments issued since publicationDate Text affectedBS 8605-1:2014 BRITISH STANDARDContentsForewo
3、rd iiiIntroduction 11 Scope 12 Normative references 23 Terms and definitions 34 General 125 Moisture content 136 Durability against biological attack 147 Species 178 Grade 189 Geometrical characteristics 1910 Warp 2111 Resistance to fixing 2212 Dimensional stability 2313 Reaction to fire 2414 Resist
4、ance to deformation 2415 Bonding quality 2516 Coating systems 2517 Wood density 2718 Hygrothermal performance 2719 Release of dangerous substances 2720 Moisture resistance 2721 Airborne sound insulation 27AnnexesAnnex A (informative) CE marking of external timber cladding 28Annex B (normative) Sampl
5、ing of boards 28Annex C (informative) Characteristics of timber species 29Annex D (informative) Timber durability selection 40Annex E (normative) Timber grading for boards 41Annex F (informative) Geometrical characteristics of boards 42Annex G (informative) Reaction to fire 53Bibliography 55List of
6、figuresFigure1Typical build-up of a timber-clad rainscreen wall (plan section) 8Figure F.1 Recommended mounting for timber cladding boards sawnthrough-and-through 44Figure F.2 Generic profile for tongue and groove boards 44Figure F.3 Generic profile for rectangular boards 46Figure F.4 Generic profil
7、e for shiplap boards 47Figure F.5 Generic profile for labyrinth jointed boards 49Figure F.6 Generic profile for parallelogram boards 50Figure F.7 Generic profile for feather edge boards 51List of tablesTable 1 Performance requirements for external timber cladding and supportbattens 12Table 2 Cross-s
8、ectional tolerances for boards 20Table 3 Maximum permitted warp in cladding boards 22Table A.1 Characteristics to be declared by a supplier as part of CEmarking 28BRITISH STANDARD BS 8605-1:2014 The British Standards Institution 2014 iTable B.1 Sample size and maximum number of non-conforming pieces
9、 29Table C.1 Relevant characteristics of selected softwood species 31Table C.2 Relevant characteristics of selected hardwood species 33Table C.3 Natural durability classes against fungi 38Table C.4 Movement classes of timber 38Table C.5 Shrinkage values for UK timbers 39Table D.1 Selection of a leve
10、l of natural or conferred durability 40Table E.1 Limits of timber features on visible face 42Table F.1 Compatibility of board profiles with timber characteristics and othercriteria 43Table F.2 Generic characteristics and dimensions for tongue and grooveboards 45Table F.3 Generic characteristics and
11、dimensions for rectangular boards 47Table F.4 Generic characteristics and dimensions for rebated boards 48Table F.5 Generic characteristics and dimensions for labyrinth jointedboards 50Table F.6 Generic characteristics and dimensions for parallelogram boards 51Table F.7 Generic characteristics and d
12、imensions for feather edge boards 52Table F.8 Minimum movement gap 52Table F.9 Minimum tongue width for tongue and groove profiles 52Table F.10 Minimum tongue thickness for tongue and groove profiles 53Table G.1 Indicative transposition between European and UK reaction to fireclasses 54Summary of pa
13、gesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 58, an inside back cover and a back cover.BRITISH STANDARDBS 8605-1:2014ii The British Standards Institution 2014ForewordPublishing informationThis part of BS 8605 is published by BSI Standards Limited, under l
14、icence fromThe British Standards Institution, and came into effect on 31 December 2014. Itwas prepared by Panel B/543/-/2, External timber cladding, under the authorityof Technical Committee B/543, Round and sawn timber. A list of organizationsrepresented on this committee can be obtained on request
15、 to its secretary.Relationship with other publicationsBS 8605 is published in two parts: Part 1: Method of specifying; and Part 2: Code of practice for design and installation.Some types of external timber cladding are covered by harmonized EuropeanStandards BS EN 14915 or BS EN 13986. This British
16、Standard offers suppliers anddesigners additional information relevant to the UKs climate and constructionpractices.Use of this documentIt has been assumed in the preparation of this part of BS 8605 that theexecution of its provisions will be entrusted to appropriately qualified andexperienced peopl
17、e, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, explanation and general informative material is presented
18、 insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity
19、from legalobligations.BRITISH STANDARD BS 8605-1:2014 The British Standards Institution 2014 iiiBRITISH STANDARDBS 8605-1:2014This page deliberately left blankiv The British Standards Institution 2014IntroductionExternal timber cladding assemblies can comprise several types of timber orwood-based co
20、mponents and can be used in a variety of ways. This complexitycan cause difficulties when specifying because: suppliers need to know what performance characteristics are important andwhich of these should be declared in product documentation; designers need to know what performance characteristics n
21、eed to be takeninto account and which should form part of a cladding specification.Several factors need to be considered when determining which performancecharacteristics should be specified. These vary depending upon the type oftimber cladding: boards, for example, involve different considerations
22、fromshingles. There is, however, no single source of information that suppliers anddesigners can use when preparing product documentation or specifications. External timber cladding made of boards or wood-based panels is within thescope of harmonized standards BS EN 14915 and BS EN 13986, respective
23、ly.This means that where a characteristic is covered by one of these standards,manufacturers need to document their products in accordance with thatstandard. Some provisions only apply in specific circumstances. There is noharmonized standard for shingles and shakes. Neither harmonized standard cove
24、rs all of the performance requirementsthat apply to external timber cladding. Some additional requirements aregiven in product standards BS EN 14519, BS EN 14951 and BS EN 15146,although not all criteria are covered.Accordingly, this standard complements the harmonized standards and productstandards
25、 for external timber cladding by: listing the main performance requirements that might be applicable toexternal timber cladding in the UK; specifying requirements for areas that are outside the scope of harmonizedstandards; and giving guidance on requirements that are covered by BS EN 14915 orBS EN
26、13986.As a method of specifying, this part of BS 8605 gives verifiable performancecharacteristics, which can be controlled by product manufacturers anddistributors. Issues, such as cavity ventilation, that become applicable duringdesign and installation are addressed in BS 8605-2.1 ScopeThis part of
27、 BS 8605 describes methods of specifying the characteristics ofexternal timber cladding products from which selection has to be made and forwhich values might have to be agreed between the purchaser and manufacturer.This part of BS 8605 complements harmonized standards BS EN 14915 andBS EN 13986. It
28、 lists all performance requirements that might apply to externaltimber cladding in the UK and provides a method of specifying thoserequirements that are outside the scope of those standards, but which arerelevant to the UKs climate and construction practices.This part of BS 8605 specifies characteri
29、stics of components at the time they aretransferred to the purchaser. It is intended for use by specifiers of externaltimber cladding components.BRITISH STANDARD BS 8605-1:2014 The British Standards Institution 2014 1NOTE 1 Suppliers can refer to this British Standard for guidance whenmanufacturing
30、external timber cladding components and preparing technicaldocumentation.This part of BS 8605 applies to external timber cladding designed to function asa rainscreen. The types of external timber cladding components covered by thisstandard are boards, shingles and shakes, and wood-based panels. Requ
31、irementsare listed separately for each of these product types.NOTE 2 BS 8605-2 gives guidance for designers of external timber claddingassemblies and installers of such products on site. It also gives guidance on theselection of other components in the external timber cladding assembly. Theseinclude
32、, for example, cavity barriers, breather membranes, fasteners and flashings.This part of BS 8605 does not apply to components to be used as non-rainsceencladding, roofing, solar shading, pressure equalized cladding, double skinfacades, curtain walling or any kind of wall covering intended solely for
33、 interioruse. Nor does it apply to cladding made of composite materials such as fibrecement board or wood-plastic composites.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references,
34、 onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.Standards publicationsBS 8605-2, External timber cladding Part 2: Code of practice for design andinstallation1)BS EN 301, Adhesives, phenolic and aminoplastic, for
35、load-bearing timberstructures Classification and performance requirementsBS EN 350-1, Durability of wood and wood-based products Natural durabilityof solid wood Part 1: Guide to the principles of testing and classification of thenatural durability of woodBS 476 (all parts), Fire tests on building ma
36、terials and structuresBS EN 635-2, Plywood Classification by surface appearance Part 2: HardwoodBS EN 635-3, Plywood Classification by surface appearance Part 3: SoftwoodBS EN 927-1, Paints and varnishes Coating materials and coating systems forexterior wood Part 1: Classification and selectionBS EN
37、 927-2, Paints and varnishes Coating materials and coating systems forexterior wood Part 2: Performance specificationBS EN 1310, Round and sawn timber Method of measurement of featuresBS EN 13183-1, Moisture content of a piece of sawn timber Part 1:Determination by oven dry methodBS EN 13183-2, Mois
38、ture content of a piece of sawn timber Part 2: Estimationby electrical resistance methodBS EN 13183-3, Moisture content of a piece of sawn timber Part 3: Estimationby capacitance methodBS EN 13307-1, Timber blanks and semi-finished profiles for non-structural uses Part 1: Requirements1)In preparatio
39、n.BRITISH STANDARDBS 8605-1:20142 The British Standards Institution 2014BS EN 13501-1:2007+A1:2009, Fire classification of construction products andbuilding elements Part 1: Classification using data from reaction to fire testsBS EN 13556, Round and sawn timber Nomenclature of timbers used in Europe
40、BS EN 13647, Wood flooring and wood panelling and cladding Determinationof geometrical characteristicsBS EN 13986:2004, Wood-based panels for use in construction Characteristics,evaluation of conformity and markingBS EN 14519, Solid softwood panelling and cladding Softwood machinedprofiles with tong
41、ue and grooveBS EN 14915, Solid wood panelling and cladding Characteristics, evaluation ofconformity and markingBS EN 14951, Solid hardwood panelling and cladding Machined profileselementsBS EN 15146, Solid softwood panelling and cladding Machined profiles withouttongue and grooveBS EN ISO 2808, Pai
42、nts and varnishes Determination of film thicknessISO 13061-2, Physical and mechanical properties of wood Test methods forsmall clear specimen Part 2: Determination of density for physical andmechanical testsPAS 2021, Exercising due diligence in establishing the legal origin of timber andtimber produ
43、cts Guide to Regulation (EU) No 995/2010Other publicationsN1WOOD PROTECTION ASSOCIATION. WPA manual: Industrial woodpreservation, specification and practice, 2nd edition. Castleford: WPA, 2012.3 Terms and definitionsFor the purposes of this British Standard, the following terms and definitionsapply.
44、3.1 air barrierlayer of the construction that provides the primary resistance to the passage ofair through the wallSOURCE: BS 8298-1:2010, 3.1NOTE 1 The air barrier is part of the backing wall and is normally located near theinner face of the building envelope. In new buildings, it is typically a de
45、dicatedair-impervious layer (e.g. a vapour control layer). In existing buildings, it is generallya non-dedicated layer comprising the air-impervious components that are alreadyfitted around the inner face of the building envelope.NOTE 2 The permeability of the air barrier can affect wind suction on
46、the cladding.See BS 8605-2 for guidance.3.2 arrisline of intersection of two faces or a face and an edgeSOURCE: BS 844-3:1995 3.19NOTE 1 The term applies to internal and external corners of components.NOTE 2 Sharp arrises can reduce the service life of coating systems.BRITISH STANDARD BS 8605-1:2014
47、 The British Standards Institution 2014 33.3 biodeteriorationspoilage of appearance and/or loss of strength properties caused by biologicalagentsSOURCE: BS EN 1001-2:2005, 1.53.4 bowlengthwise curvature of a piece of sawn timber normal to the faceSOURCE: ISO 24294:2013, 5.34.13.5 breather layerlayer
48、 of a construction that is designed to resist the passage of liquid waterfrom one part of a construction to another, whilst permitting the passage ofwater vapour in either directionSOURCE: BS 8298-1:2010, 3.8NOTE 1 The breather layer does not function as the air barrier (see 3.1).NOTE 2 The breather
49、 layer comprises a breather membrane or other producthaving similar performance.3.6 cavityair layer within a building envelope located between the external cladding andinner components such as the breather layerNOTE Cavities can be unventilated, slightly ventilated or ventilated as defined inBS EN ISO 6946. Not all cavity types are suitable for use with external timbercladding. See BS 8605-2 for further information.3.7 cavity barr
