NATIONAL GRADING RULE for DIMENSION LUMBER - SPIB

For purposes of the National Grading Rule for Dimension Lumber, "dimension" is limited to surfaced softwood lumber of nominal thicknesses from 2 through 4 inches and nominal widths 2 inches and wider; and which is designed for use as framing members such as joists, planks, rafters and studs. [For Redwood, ................
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