Grade Stamps Approved for Use by CLSAB Accredited Agencies

January 12, 2022 – Memo to Building SCOs from the Canadian Lumber Standards Accreditation Board

The Canadian Lumber Standards Accreditation Board (CLSAB) monitors the quality of Canada’s lumber grading and identification system to ensure it conforms with the National Building Code.

Below, you will find facsimiles of the 13 grade stamps approved for use by the 11 CLSAB Accredited Agencies. They are referenced in Article 9.3.2.1(1) of the National Building Code. The document also includes the contact information for each CLSAB Accredited Agency, should you have questions about their stamp.

All grade stamps must include the following information:

1. registered trademark of the accredited agency,
2. facility number and/or name,
3. grade of the lumber,
4. species or species combination,
5. moisture content at time of grade stamping on lumber under five-inch nominal thickness,
6. CLSAB approved grading rule, i.e. NLGA,
7. other information may be required depending on the grading rule and/or product standards approved by CLSAB. For example, there are additional requirements for fingerjoined and machine stress rated lumber.

Detailed information about the grade mark and the additional requirements for fingerjoined and machine stress rated lumber is available on the CLSAB website.