Structural Lumber.

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1. Wood members of a structural system which are manufactured by sawing, resawing, passing lengthwise through standard planing machine, crosscutting to length, but without further manufacturing. 2. Lumber that is 2 or more inches thick and 4 or more inches wide; intended for use where strength is required; the grading of structural lumber is based on the strength of the piece and its use.

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