BS 4978:1988
Date published:
Specification for softwood grades for structural use
Specifies 2 methods of grading softwood namely, visual and machine stress grading. Permissible limits of characteristics for: (a) 2 visual stress grades - General Structural (GS) and Special Structural (SS); (b) 3 laminating grades - LA, LB and LC. Requirements for machine stress grades; Machine General Structural (MGS), Machine Special Structural (MSS), M50 and M75 and Strength Classes are specified. Also includes performance requirements for machines which grade softwood.
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BS 4978:1988
Get this standard
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PDF
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HardCopy
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