Understanding grade stamps on lumber

Check out this infographic to learn what the marks mean on lumber grade stamps.

Grading – OLMA – Ontario Lumber Manufacturers Agency

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lumber stamp - Generation Building Center

Lumber Grade Stamps - InterNACHI®

Special Report: Import Lumber Grades

ALSC reports more non-ALS lumber grade marks appearing in California and Quebec - ICC

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Grade Stamps

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Using ungraded lumber in farm buildings

Interpreting a Softwood Lumber Grading Stamp

Strength Grading (factsheet) - Wood Campus

Lumber Grade Stamps and Codes - What do they mean?

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