The quality of softwood timber for structural use depends very much on the environment in which it is grown and the species selected. Timber can be visually strength graded, but this is unlikely to occur at the construction site except for a general examination for obvious handling defects and damage during transit. Site inspection will be to determine that the grading authority's markings on the timber comply with that specified for the application.
Format of strength grade markings on softwood timber for
structural uses ~
*Accredited certification authorities include
BM TRADA Certification Ltd. and Certification And Timber Grading Ltd. Refs. BS 4978: Visual strength grading of softwood. Specification. BS EN 14081: Timber structures. Strength graded structural timber with rectangular cross section. (In 4 parts).
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