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1、BRITISH STANDARD BS 1186-3: 1990 Incorporating Amendment No. 1 Timber for and workmanship in joinery Part 3: Specification for wood trim and its fixing ICS 79.080 BS 1186-3:1990 This British Standard, having been prepared under the direction of the Timber Standards Policy Committee, was published un
2、der the authority of the Board of BSI and comes 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
3、this British 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
4、of the Environment (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 Roya
5、l Institution 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 9386April 1997 Indicated by a sidelin
6、e in the margin BS 1186-3:1990 BSI 06-1999i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 1.0Introduction 1 1.1Scope1 1.2Definitions2 Section 2. Selection of timber species 2.1Species of timber for end uses3 Section 3. Moisture content 3.1Moisture content4 3.2
7、Measurement of moisture content4 Section 4. Quality of timber prior to the wood trim being fixed 4.1Classification5 4.2Knots and knot clusters5 4.3Splits, shakes and checks6 4.4Limits of resin pockets7 4.5Limits of sapwood7 4.6Limits of wane7 4.7Limits on rate of growth of softwood7 4.8Limit on slop
8、e of grain7 4.9Limits of exposed pith7 4.10 Limits of decay and insect attack7 4.11 Laminating and edge jointing7 4.12 Finger jointing7 4.13 Surface quality8 Section 5. Fixing wood trim 5.1General13 5.2End trimming13 5.3Nailing13 5.4Fixing by screws13 Appendix A Recommendations for specifying timber
9、 for wood trim14 Appendix B Some species of softwood and their suitability for use as wood trim15 Appendix C Some species of hardwood and their suitability for use as wood trim16 Appendix D Recommendations for maintaining the moisture content of wood trim21 Appendix E Typical profiles 22 Appendix F
10、Making good at the time of decoration 28 Figure 1 Limits of knots and knot clusters for exposed surfaces of wood trim6 Figure 2 Round knot8 Figure 3 Oval knot8 Figure 4 Arris knot9 Figure 5 Splay knot9 Figure 6 Margin knot10 Figure 7 Branched knot10 Figure 8 Knot cluster11 BS 1186-3:1990 ii BSI 06-1
11、999 Page Figure 9 Examples of the method of measuring the relevant dimension of exposed surfaces of wood trim11 Figure 10 Measurement of rate of growth12 Figure 11 Cladding23 Figure 12 Rounded trim24 Figure 13 Chamfered trim25 Figure 14 Bevelled trim25 Figure 15 Half rounded trim26 Figure 16 Miscell
12、aneous trim27 Table 1 Moisture content limits of solid timber4 Table 2 Some species of softwood and their suitability for use as wood trim15 Table 3 Some species of hardwood and their suitability for use as wood trim16 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun,
13、 na, Fri Nov 24 08:16:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1186-3:1990 BSI 06-1999iii Foreword This Part of BS 1186 has been prepared under the direction of the Timber Standards Policy Committee and it supersedes BS 584, which is withdrawn. It brings together in one Part updated versions
14、 of those clauses and figures of BS 1186-1:1971, BS 1186-2:1971 and BS 584:1967 that dealt with wood trim, and relates to both softwood and hardwood (which was omitted from BS 584). The other Part of BS 1186 is Part 2 Specification for workmanship. Part 1 Specification for timber is superseded by BS
15、 EN 942:1996 Timber in joinery General classification of timber quality. This Part of BS 1186 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 s
16、olid timber panelling and exterior solid timber cladding and fascias. 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 covere
17、d by written purchase specifications and will continue to be so covered. Until the publication of this Part of BS 1186, 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, of
18、ten by a different company from that which produced the wood trim. Account has been taken of this in the drafting of this Part of BS 1186. Owing to the difficulty in distinguishing sapwood from heartwood in some species, preservative treatments have to be specified for some species for exterior use.
19、 It has been accepted that the standard profiles that were detailed in BS 584 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 pres
20、ented in Appendix E. Specifiers and traders are encouraged to specify 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
21、that some will be stocked by merchants in at least one of the classes of this Part of this standard. To assist in specifications, a British Standard reference has been allocated to each profile. Since this Part of BS 1186 specifies both the manufacture and fixing of wood trim, any claims of complian
22、ce with this Part of BS 1186 should state clearly the sections of this Part of BS 1186 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 wit
23、h a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 28, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had ame
24、ndments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:16:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank BS 1186-3:1990 BSI 06-19991 Section 1. General 1.0 Introduction 1.0.1 This Part of BS 118
25、6 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 purchaser, or subsequently to another purchaser or the company that will fix the wood trim or profiled boarding. This P
26、art of BS 1186 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 the time of decoration. Providing that the required extent of end trimming does not exceed that specified in section 5,
27、 the wood trim at the time it is supplied is considered to comply with this Part of BS 1186 (see also 1.0.11). For the purposes of this Part of BS 1186, “wood trim” includes the following. a) Exterior: barge boards, fascia boards, architraves, weather trims (e.g. between a window and a wall), exteri
28、or solid timber cladding and ancillary trim (tongued and grooved, square edged and shiplap), mouldings and cover strips. b) Interior: skirting boards, picture rails, architraves, cornices, mouldings (e.g. scotia, half rounds, astragals, cover strips and fillets), interior solid timber panelling and
29、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 joinery (e.g. handrails, newel posts and spindles, door weatherdrips, windowheads and planted stops) should comp
30、ly with BS EN 942 and BS 1186-2, and are not covered by this Part of BS 1186. 1.0.2 In the past, most specifications for timber have tended to refer to commercial gradings which, in themselves, are insufficient to ensure a correct specification for wood trim. This Part of BS 1186 continues the polic
31、y followed in the other Parts of BS 1186, 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 the way in which wood trim is supplied and fixed (i.e. perhaps requiring end trimming before fixing, and m
32、aking good as part of the decoration process), this Part of BS 1186 deals with the times at which quality and workmanship are assessed in a different way from BS 1186-1 and BS 1186-2. 1.0.4 To establish the class (see 4.1) appropriate to wood trim for a particular use, reference should be made to th
33、e 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 selected and agreed between the producer and the purchaser (see Appendix A). 1.0.5 The classification sys
34、tem used should not be confused with similarly designated classifications in other British Standards (e.g. class 1, 2, etc. specified in BS 476-7, which is applicable to spread of flame characteristics). 1.0.6 This Part of BS 1186 follows the policy of BS 1186-1 in not requiring the timber to be mar
35、ked 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 Appendix C. 1.0.8 Clauses on laminated, finger jointed and edge jointed timber (see 4.11 and 4.12
36、) 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 jointing are not detrimental to the performance of wood trim and are likely to confer additional dimensi
37、onal 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 use and are intended to encourage standardization. To assist in the preparation of written specifica
38、tions, 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 not exceed that recommended in Appendix F, the wood trim as fixed is considered to comply with th
39、is Part of BS 1186. 1.1 Scope This Part of BS 1186 specifies requirements for the timber species, moisture content, classification and quality. It also specifies requirements for the workmanship involved in fixing wood trim. BS 1186-3:1990 2 BSI 06-1999 This Part of BS 1186 applies to wood trim of s
40、olid 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 may be necessary at the time of fixing the wood trim, and to making good which may be necessar
41、y 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 good at the time of decoration respectively. Appendix B and Appendix C indicate species of soft
42、wood 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 Part of BS 1186, the definitions given in BS 6100-1.0 and BS 6100-4 apply together with the foll
43、owing. Nomenclature is defined in BS 7359. 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 does not extend through timber or veneer from one surface to the other 1.2.3 joinery assemb
44、ly 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 built up with face-to-face or with edge-to-edge joints 1.2.5 lamination layer in laminate
45、d 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 separation of fibres along the grain forming a crack or fissure that extends through timber o
46、r 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 BS 1186, the definition of wood trim is more extensive than the usual definition of wood trim. NOTE 2See 1.0 for examples. NOTE 3Typical profiles
47、of wood trim are given in Appendix E. BS 1186-3:1990 BSI 06-19993 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 as being unsuitable in Appendix B and Appendix C. A timber species stated in Appendix B
48、 or Appendix C as being suitable for a particular end use provided that it is preserved shall be preserved in accordance with BS 5589, if it is used for that end. NOTEAppendix B and Appendix C list some of the species that are generally available in the UK and cross reference each species to the pur
49、poses 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 not so readily available in the UK. BS 1186-3:1990 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