Pacific Lumber Inspection Bureau Releases New Grading Rule Book

The Pacific Lumber Inspection Bureau (PLIB) has published a new grading rule book, titled WCLB Standard Grading Rules for West Coast & Imported Softwood lumber, No. 18, 2022, according to reporting by The Construction Specifier.

The new book replaced WCLB Standard No. 17, the bureau’s previous version of the grading rules, written and first published by the West Coast Lumber Inspection Bureau (WCLIB) in 1991 (and revised several times since then).


When the WCLIB and PLIB merged operations in 2019, the PLIB was recognized by the American Lumber Standards Committee (ALSC) as a lumber grading rules-writing authority. The recently released new grading book is the first major revision to rule book since the merger in 2019, and the first to be published by the PLIB. The new grading book is now recognized as the official WCLB Grading Rules for West Coast & Imported lumber.

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