1、BRITISH STANDARD BS1297:1987 Specification for Tongued and grooved softwood flooring UDC692.535.1:691.113:543.812BS1297:1987 This British Standard, having been prepared under the directionof the Timber StandardsCommittee, was published under the authority ofthe Board of BSI and comes intoeffect on 3
2、0 October1987 BSI 03-1999 First published February1946 First revision April1952 Second revision November1961 Third revision August1970 Fourth revision October1987 The following BSI references relate to the work on this standard: Committee reference TIB/1 Draft for comment 86/11522DC ISBN 0 580 16135
3、 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Timber Standards Committee (TIB/-) to Technical Committee TIB/1, upon which the following bodies were represented: British Timber Merchants Association British Woodworking Federation Dep
4、artment of the Environment (Building Research Establishment Princes Risborough Laboratory) Department of the Environment (Housing and Construction Industries) Forestry Commission Home Timber Merchants Association of Scotland Institute of Building Control Institute of Clerks of Works of Great Britain
5、 Inc. Institute of Machine Wood Working Technology Ltd. Institution of Structural Engineers National Sawmilling Association Scottish Special Housing Association Scottish Timber Trade Association Timber Drying Association Timber Packaging and Pallet Confederation Timber Research and Development Assoc
6、iation Timber Trade Federation Amendments issued since publication Amd. No. Date of issue CommentsBS1297:1987 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Species 1 4 Permitted characteristics 1 5 Manufacture 2 6 Moisture content 2 App
7、endix A Method of knot measurement 4 Figure 1 Typical section of joint 3 Figure 2 Square cross section giving the maximum transection of theknots 4 Figure 3 Measurement of rate of growth 4 Figure 4 Measurement of cup 5 Table 1 Cross section sizes 2 Table 2 Tongue sizes 2 Publications referred to Ins
8、ide back coverBS1297:1987 ii BSI 03-1999 Foreword This British Standard has been revised under the direction of the Timber Standards Committee. It supersedes BS1297:1970, which is withdrawn. This revision extends the range of species and amends the moisture content requirements. Compliance with this
9、 standard applies at the point of first delivery by the manufacturer. 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 immu
10、nity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, an inside back cover and a back cover. This standard has been updated (see copy right date) and may have had amendments incorporated. This will be indicated in the
11、 amendment table on theinside front cover.BS1297:1987 BSI 03-1999 1 1 Scope This British Standard specifies a range of species, characteristics, manufacturing and moisture content requirements for tongued and grooved softwood flooring, installed in accordance with the recommendations of BS8201. Appe
12、ndix A describes a method of knot measurement. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the definitions given in BS6100-4 apply, together with the following. fissure longitudinal separ
13、ation of the fibres, appearing on a face, edge or end of a piece of softwood, and including checks, shakes and splits NOTENomenclature is given in BS881, BS 589. 3 Species For the purposes of compliance with this BritishStandard, tongued and grooved flooring shall be manufactured from the following
14、species: Imported European redwood; Imported European whitewood; British grown Corsican pine; British grown Douglas fir; British grown latch; British grown Scots pine; Canadian Douglas fir-larch; Canadian Hem-fir; Canadian Spruce-pine-fir; USA Douglas fir-larch; USA Hem-fir; USA Southern pine. NOTET
15、he species listed above are referenced by their common name. For information concerning botanical species, other common names and Canadian and USA species combinations, reference should be made to Appendix A of BS5268-2:1984. 4 Permitted characteristics 4.1 Knots 4.1.1 Sound and tight knots. The com
16、bined widths of all the knots on the face and back at any cross section shall not exceed two thirds of the width of the piece see Figure 2(a) and Figure 2(b). All knots shall be measured in accordance with the method described in Appendix A. 4.1.2 Unsound and loose knots. Pieces shall be free from u
17、nsound knots exceeding 25mm in diameter, and loose knots or knot holes exceeding10mm in diameter. 4.2 Fissures Fissures upon the face side shall not exceed 1mm in width or 300mm in length or a depth greater than half the thickness of the piece. Fissures upon the back side shall be limited only as to
18、 their depth which shall not be greater than half the thickness of the piece. End fissures not exceeding 300mm in length in one end of the piece, or the equivalent of 300mm if in both ends, shall be permitted in not more than10% of the pieces in any one delivery. The depth of fissures shall be measu
19、red by the use of a feeler gauge not exceeding 0.2mm in thickness. 4.3 Wane The face side of all pieces shall be free from wane. The back may have wane on both edges, provided that it does not impinge upon either tongue or groove. 4.4 Sapwood Bright sapwood is permitted to an unlimited extent. Occas
20、ional sapstain shall be permitted on the face side. There is no restriction on the back side. 4.5 Rate of growth Rate of growth shall not be less than an average of four growth rings per 25mm (see Figure 3). Rate of growth shall be measured on one end of the piece, and expressed as the average ring
21、width in millimetres along a straight line 75mm long normal to the growth rings, passing through the centre of the end of the piece see Figure 3(a), or commencing25mm from the pith where this is present see Figure 3(b). When a line 75mm in length is unobtainable, the measurement shall be made on the
22、 longest possible line normal to the growth rings and passing through the centre of the piece. 4.6 Cup Cupping shall not exceed 1mm for each 50mm of width (see Figure 4). 4.7 Decay and insect attack All pieces shall be free from decay and insect attack including attack by ambrosia beetle.BS1297:1987
23、 2 BSI 03-1999 5 Manufacture 5.1 General All pieces shall be accurately machined to uniform section throughout their length. They shall be smoothly finished on the face showing not less than ten cutter marks per 30mm of length and thicknessed on the back hit-and-miss to the specified size. Tongues a
24、nd grooves shall provide a well matched joint with level faces between contiguous pieces when laid. 5.2 Determination of sizes 5.2.1 Cross section sizes. Finished sizes shall be as given in Table 1in any combination of thickness and face width. Sizes shall be measured at the moisture content specifi
25、ed in clause 6. Table 1 Cross section sizes Lengths shall be 1.8m and longer with a minimum average in delivery of 3.0m. 5.2.2 Permitted deviations in cross section sizes in manufacture. The maximum permitted deviations from specified sizes shown in Table 1 shall be: 5.2.3 Tongue and groove sizes 5.
26、2.3.1 Tongue size. The sizes of the tongue shall be as given in Table 2 and Figure 1. Table 2 Tongue sizes The maximum permitted deviations of the finished top width of tongue shall be 1mm, 0mm. The finished tongue bottom width shall be 0.5mm greater than that of the top width (see Figure 1). 5.2.3.
27、2 Groove size. The groove size shall be not less than 1mm deeper than the width of the upper face of the tongue and the section shall be able to accommodate the tongue with a push fit. 6 Moisture content 6.1 The moisture content of any board at the time of delivery shall not exceed 19%. NOTE 1Where
28、it is intended that flooring is to be installed in buildings with continuous heating providing room temperatures of 12 C to 19 C or higher, it is recommended that boards with a lower moisture content than 19% are used, otherwise there is a strong probability that some degrade in respect of fissures,
29、 cupping and shrinkage will result. The supply of boards with a lower moisture content should be the subject of special arrangements between the supplier and specifier. 6.2 Where it is required that the moisture content be verified, such verification shall be carried out at the time of delivery. Moi
30、sture content shall be checked using an electrical resistance moisture meter which is capable of making individual measurements with an accuracy of 2% at moisture contents from7% to28%. The meter shall be accompanied by the manufacturers instructions and all procedures shall comply with these instru
31、ctions. NOTE 1If the moisture content does not comply with 6.1, the supplier should be informed within 24hours. NOTE 2Electrical resistance moisture meters could give grossly inaccurate results when used on timber containing inorganic salts such as may be the case after treatment with flame retardan
32、ts or some water borne preservatives. In such cases it may be appropriate to refer to the meter manufacturer for a correction factor. mm mm mm mm Finished thicknesses 16 19 21 28 Finished widths of face 65 90 113 137 thickness: 0mm,+2mm; face width: 1mm. Finished thickness, mm A 16 19 21 28 Finished
33、 tongue thickness, mm B 4.5 6 6 6 Finished tongue top width, mm C 7 7 7 7 Face of board to top of tongue, mm D 7 7 8 12BS1297:1987 BSI 03-1999 3 Figure 1 Typical section of jointBS1297:1987 4 BSI 03-1999 Appendix A Method of knot measurement To obtain two-thirds width of a board137mm wide, first mul
34、tiply by2and then divide by3. Thus 137mm2=274mm. 274mm 3=91mm rounded to the nearest millimetre. Example 1 see Figure 2(a) In Figure 2(a), abcd is a cross section giving the maximum transection of the knots. The aggregate knot width on the face and back = 50mm+54mm=104mm. As this exceeds the stated
35、figure of 91mm, representing two-thirds the width of the board, the board does not comply with this standard. Example 2 see Figure 2(b) In Figure 2(b), abcd is a cross section giving the maximum transection of the knots. The aggregate knot width on the face or back only=50mm+25mm=75mm. Therefore the
36、 board complies with this standard. As the knots are slightly staggered relative to the length of the board, the cross section does not transect both knots at their widest. The section that shall be taken is the one giving the maximum transection of the knots. Figure 2 Square cross section giving th
37、e maximum transection of the knots Figure 3 Measurement of rate of growthBS1297:1987 BSI 03-1999 Figure 4 Measurement of cup6 blankBS1297:1987 BSI 03-1999 Publications referred to BS881, BS589, Nomenclature of commercial timbers, including sources of supply. BS5268, Structural use of timber. BS 5268
38、-2, Code of practice for permissible stress design, materials and workmanship. BS6100, Glossary of building and civil engineering terms. BS 6100-4, Forest products. BS8201, Code of practice for flooring of timber, timber products and wood based panel products. BSI 389 Chiswick High Road London W4 4A
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