Grading Rules Agencies and Typical Grade Stamps Two relevant documents are published by the American Lumber Standards Committee (ALSC), Incorporated: Certified Grading Rules, Accredited Grading Agencies and Grade Stamps The grading rules and grading agencies listed in the facsimile list from this link are certified and accredited as conforming to the American Softwood Lumber Standard, PS20, by the Board of Review of ALSC. Typical grade stamps of the accredited agencies are included in the list. This document is updated frequently, so check back often. Accredited Agencies and Quality Marks, Pressure Treated Wood Products The facsimile list available from this link includes agencies accredited by the Board of Review of ALSC for the supervisory and lot inspection of pressure treated wood products. Typical accredited agency quality marks are also included in the list. This document is also updated frequently, so check back often.
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