WCLIBWest Coast Lumber Inspection Bureau (Portland, Oregon)
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Table 2 Knot limits for Douglas-fir Structural Joists & Planks per WCLIB Grade Rules No.
To date, several thousand pieces of full-size Douglas-fir lumber have been graded by WCLIB grading supervisors at deconstruction sites, several of which are decommissioned military bases, including the Twin Cities Army Arsenal in Minnesota; Ft.
The NLGA rules appear to be substantially equivalent to those of WCLIB [19].