BS 4978:1973
Date published:
Specification for timber grades for structural use
Specifies structural timber assessed by visual or machine stress grading. Requirements are given for sizes, deviations in size, processing reductions, knots, fissures, slope of grain, wane, rate of growth, resin pockets, distortion, wormholes and other defects. Illustrations show the principles of knot projection to estimate the knot area ratio in visual grading and the measurement of other characteristics affecting strength.
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Related Information
79.040 Wood, sawlogs and sawn timber
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BS 4978:1973
Get this standard
Prices exclude GST
PDF
( Single user document)
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HardCopy
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