1、BRITISH STANDARD BS1186-3: 1990 Incorporating Amendment No.1 Timber for and workmanship in joinery Part3: Specification for wood trim and its fixing ICS 79.080BS1186-3:1990 This British Standard, having been prepared under the direction of the Timber StandardsPolicy Committee, waspublished under the
2、 authorityof the Board of BSI andcomes into effect on 31 August 1990 BSI 06-1999 The following BSI references relate to the work on this standard: Committee reference TIB/22 Draft for comment 88/12325 DC ISBN 0 580 18211 8 Committees responsible for this British Standard The preparation of this Brit
3、ish Standard was entrusted by the Timber Standards Policy Committee (TIB/) to Technical Committee TIB/22, upon which the following bodies were represented: British Wood Preserving Association British Woodworking Federation Department of the Environment (Property Services Agency) Department of the En
4、vironment (Building Research Establishment) Fibre Building Board Organization (FIDOR) Incorporated Assocation of Architects and Surveyors Institute of Clerks of Works of Great Britain Inc. Joinery Managers Association Ltd. London Housing Consortium Royal Institute of British Architects Royal Institu
5、tion of Chartered Surveyors Scottish Timber Trade Association Steel Hingemakers Association Swedish Finnish Timber Council Ltd. Timber Research and Development Association Timber Trade Federation Amendments issued since publication Amd. No. Date Comments 9386 April 1997 Indicated by a sideline in th
6、e marginBS1186-3:1990 BSI 06-1999 i Contents Page Committees responsible Inside front cover Foreword iii Section 1. General 1.0 Introduction 1 1.1 Scope 1 1.2 Definitions 2 Section 2. Selection of timber species 2.1 Species of timber for end uses 3 Section 3. Moisture content 3.1 Moisture content 4
7、3.2 Measurement of moisture content 4 Section 4. Quality of timber prior to the wood trim being fixed 4.1 Classification 5 4.2 Knots and knot clusters 5 4.3 Splits, shakes and checks 6 4.4 Limits of resin pockets 7 4.5 Limits of sapwood 7 4.6 Limits of wane 7 4.7 Limits on rate of growth of softwood
8、 7 4.8 Limit on slope of grain 7 4.9 Limits of exposed pith 7 4.10 Limits of decay and insect attack 7 4.11 Laminating and edge jointing 7 4.12 Finger jointing 7 4.13 Surface quality 8 Section 5. Fixing wood trim 5.1 General 13 5.2 End trimming 13 5.3 Nailing 13 5.4 Fixing by screws 13 Appendix A Re
9、commendations for specifying timber for wood trim 14 Appendix B Some species of softwood and their suitability for use as wood trim 15 Appendix C Some species of hardwood and their suitability for use as wood trim 16 Appendix D Recommendations for maintaining the moisture content of wood trim 21 App
10、endix E Typical profiles 22 Appendix F Making good at the time of decoration 28 Figure 1 Limits of knots and knot clusters for exposed surfaces of wood trim 6 Figure 2 Round knot 8 Figure 3 Oval knot 8 Figure 4 Arris knot 9 Figure 5 Splay knot 9 Figure 6 Margin knot 10 Figure 7 Branched knot 10 Figu
11、re 8 Knot cluster 11BS1186-3:1990 ii BSI 06-1999 Page Figure 9 Examples of the method of measuring the relevant dimension of exposed surfaces of wood trim 11 Figure 10 Measurement of rate of growth 12 Figure 11 Cladding 23 Figure 12 Rounded trim 24 Figure 13 Chamfered trim 25 Figure 14 Bevelled trim
12、 25 Figure 15 Half rounded trim 26 Figure 16 Miscellaneous trim 27 Table 1 Moisture content limits of solid timber 4 Table 2 Some species of softwood and their suitability for use as wood trim 15 Table 3 Some species of hardwood and their suitability for use as wood trim 16 Publications referred to
13、Inside back coverBS1186-3:1990 BSI 06-1999 iii Foreword This Part of BS1186 has been prepared under the direction of the Timber Standards Policy Committee and it supersedes BS584, which is withdrawn. It brings together in one Part updated versions of those clauses and figures of BS1186-1:1971, BS118
14、6-2:1971 and BS584:1967 that dealt with wood trim, and relates to both softwood and hardwood (which was omitted from BS584). The other Part of BS1186 is Part2 Specification for workmanship. Part1 Specification for timber is superseded by BSEN942:1996 Timber in joinery General classification of timbe
15、r quality. This Part of BS1186 covers exterior and interior wood trim as described in 1.0.1. It should be noted that this description is more extensive than is usually understood for wood trim in that, for example, it includes interior solid timber panelling and exterior solid timber cladding and fa
16、scias. It also includes rectangular or moulded sections, with planed, sawn or sanded surfaces. Four quality classifications are given for wood trim. A percentage of wood trim is sold “as seen”. However, a significant percentage is covered by written purchase specifications and will continue to be so
17、 covered. Until the publication of this Part of BS1186, wood trim had usually been included in specifications under the category of “joinery”. Wood trim is usually manufactured and sold over length to be end trimmed at a later stage, often by a different company from that which produced the wood tri
18、m. Account has been taken of this in the drafting of this Part of BS1186. Owing to the difficulty in distinguishing sapwood from heartwood in some species, preservative treatments have to be specified for some species for exterior use. It has been accepted that the standard profiles that were detail
19、ed in BS584 have not been successful in encouraging standardization. The Technical Committee has consulted with the timber trade and users and has consequently agreed sizes for a limited range of profiles in common use. These are presented in Appendix E. Specifiers and traders are encouraged to spec
20、ify these profiles to begin the process of achieving the economies and the convenience of interchangeability which are possible with standardization. It should be realized that the profiles may not be stock items although it is hoped that some will be stocked by merchants in at least one of the clas
21、ses of this Part of this standard. To assist in specifications, a British Standard reference has been allocated to each profile. Since this Part of BS1186 specifies both the manufacture and fixing of wood trim, any claims of compliance with this Part of BS1186 should state clearly the sections of th
22、is Part of BS1186 with which compliance is claimed. 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 ob
23、ligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, pages1 to28, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on t
24、he inside front cover.iv blankBS1186-3:1990 BSI 06-1999 1 Section 1. General 1.0 Introduction 1.0.1 This Part of BS1186 specifies requirements for timber species and quality classifications of wood trim, including profiled boarding, at the time that it is handed over from the producer to the first p
25、urchaser, or subsequently to another purchaser or the company that will fix the wood trim or profiled boarding. This Part of BS1186 also specifies requirements for fixing wood trim, including profiled boarding, which permit a certain amount of end trimming at the time of fixing and making good at th
26、e time of decoration. Providing that the required extent of end trimming does not exceed that specified in section 5, the wood trim at the time it is supplied is considered to comply with this Part of BS1186 (see also 1.0.11). For the purposes of this Part of BS1186, “wood trim” includes the followi
27、ng. a) Exterior: barge boards, fascia boards, architraves, weather trims (e.g.between a window and a wall), exterior solid timber cladding and ancillary trim (tongued and grooved, square edged and shiplap), mouldings and cover strips. b) Interior: skirting boards, picture rails, architraves, cornice
28、s, mouldings (e.g.scotia, half rounds, astragals, cover strips and fillets), interior solid timber panelling and ancillary trim (tongued and grooved, square edged and shiplap) and window boards. Certain other items supplied loose but intended to be fixed to joinery and to be a functional part of the
29、 joinery (e.g.handrails, newel posts and spindles, door weatherdrips, windowheads and planted stops) should comply with BSEN942 and BS1186-2, and are not covered by this Part of BS1186. 1.0.2 In the past, most specifications for timber have tended to refer to commercial gradings which, in themselves
30、, are insufficient to ensure a correct specification for wood trim. This Part of BS1186 continues the policy followed in the other Parts of BS1186, of eliminating all references to commercial grading of timber. 1.0.3 There are various stages at which the quality of wood trim can be assessed. Due to
31、the way in which wood trim is supplied and fixed (i.e.perhaps requiring end trimming before fixing, and making good as part of the decoration process), this Part of BS1186 deals with the times at which quality and workmanship are assessed in a different way from BS1186-1 and BS1186-2. 1.0.4 To estab
32、lish the class (see 4.1) appropriate to wood trim for a particular use, reference should be made to the appropriate British Standard for the product. However, if no class is defined in the British Standard, or if no British Standard exists for the product, it is necessary for the class(es) to be sel
33、ected and agreed between the producer and the purchaser (see Appendix A). 1.0.5 The classification system used should not be confused with similarly designated classifications in other British Standards (e.g.class 1, 2, etc. specified in BS476-7, which is applicable to spread of flame characteristic
34、s). 1.0.6 This Part of BS1186 follows the policy of BS1186-1 in not requiring the timber to be marked to identify its class. 1.0.7 To meet the end use requirements of various items of wood trim, an assessment of the suitability of the more commonly available timber species is given in Appendix B and
35、 Appendix C. 1.0.8 Clauses on laminated, finger jointed and edge jointed timber (see 4.11 and 4.12) are included to enable more effective use to be made of the available supplies of timber and to promote greater consistency, economy and improved stability. Laminating, finger jointing and edge jointi
36、ng are not detrimental to the performance of wood trim and are likely to confer additional dimensional stability. 1.0.9 Recommendations for maintaining the moisture content of wood trim are given in Appendix D. 1.0.10 Appendix E includes a limited range of dimensioned profiles which are in common us
37、e and are intended to encourage standardization. To assist in the preparation of written specifications, each profile is referenced. 1.0.11 Appendix F gives recommendations for making good at the time of decoration. Providing that the required extent of the making good at the time of decoration does
38、 not exceed that recommended in Appendix F, the wood trim as fixed is considered to comply with this Part of BS1186. 1.1 Scope This Part of BS1186 specifies requirements for the timber species, moisture content, classification and quality. It also specifies requirements for the workmanship involved
39、in fixing wood trim.BS1186-3:1990 2 BSI 06-1999 This Part of BS1186 applies to wood trim of solid timber or of laminated, finger jointed and edge jointed wood trim that is suitable for use without any decorative finish or with an opaque or non-opaque finish. Reference is made to end trimming which m
40、ay be necessary at the time of fixing the wood trim, and to making good which may be necessary at the time of decoration. Appendix A, Appendix D, Appendix E and Appendix F give information and recommendations on the specifying of timber for wood trim, moisture content, typical profiles and making go
41、od at the time of decoration respectively. Appendix B and Appendix C indicate species of softwood and hardwood and their suitability for use as wood trim. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 1.2 Definitions For the purposes of this Par
42、t of BS1186, the definitions given in BS6100-1.0 and BS6100-4 apply together with the following. Nomenclature is defined in BS7359. 1.2.1 consignment delivery of items of wood trim made to a purchaser at any one time 1.2.2 check separation of fibres along the grain forming a crack or fissure that do
43、es not extend through timber or veneer from one surface to the other 1.2.3 joinery assembly of worked timber components and panel products other than structural timber or cladding 1.2.4 jointed wood piece of wood made up from smaller pieces joined together end-to-end, such as with finger joints, or
44、built up with face-to-face or with edge-to-edge joints 1.2.5 lamination layer in laminated wood 1.2.6 shake separation of fibres along the grain, irrespective of the extent of penetration, due to stresses developing in a standing tree, or in felling, or in drying of converted timber 1.2.7 split sepa
45、ration of fibres along the grain forming a crack or fissure that extends through timber or veneer from one surface to the other 1.2.8 wood trim product of uniform profile to be used as a finishing member NOTE 1For the purposes of this Part of BS1186, the definition of wood trim is more extensive tha
46、n the usual definition of wood trim. NOTE 2See 1.0 for examples. NOTE 3Typical profiles of wood trim are given in Appendix E.BS1186-3:1990 BSI 06-1999 3 Section 2. Selection of timber species 2.1 Species of timber for end uses Timber species shall not be used in situations for which they are stated
47、as being unsuitable in Appendix B and Appendix C. A timber species stated in Appendix B or Appendix C as being suitable for a particular end use provided that it is preserved shall be preserved in accordance with BS5589, if it is used for that end. NOTEAppendix B and Appendix C list some of the spec
48、ies that are generally available in the UK and cross reference each species to the purposes for which they are suitable, suitable if preserved or unsuitable. These lists are not exhaustive and there are other species for use in wood trim, which may be suitable or suitable if preserved but which are
49、not so readily available in the UK.BS1186-3:1990 4 BSI 06-1999 Section 3. Moisture content NOTE 1The requirements of this section are aimed at minimizing any movement or distortion of wood trim by ensuring, as far as possible, that the moisture content of the timber as supplied and fixed is close to the moisture content or moisture content range that it will experience in service. See also Appendix D. NOTE 2The requirements of this section relate only to solid timber and not to wood based panel products which usually have equilibrium m
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