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Historical Revision

BSI BS 4978:1973

Visual strength grading of softwood. Specification
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BSI BS 4978:1973

Visual strength grading of softwood. Specification

PUBLISH DATE 1979
PAGES 23
BSI BS 4978:1973
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.
SDO BSI: British Standards Institution
Document Number 4978
Publication Date June 1, 1979
Language en - English
Page Count 23
Revision Level
Supercedes
Committee B/518
Publish Date Document Id Type View
May 31, 2007 BS 4978:2007 Revision
Aug. 15, 1996 BS 4978:1996 Revision
Nov. 30, 1988 BS 4978:1988 Revision
June 1, 1979 BS 4978:1973 Revision
Nov. 30, 2017 BS 4978:2007+A2:2017 Consolidated