Grade Marks

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Lumber used in construction is grade stamped in Canada with identifying markings to show that it conforms to the National Lumber Grades Authority (NLGA) grading rules for Canadian lumber. The grading and grade marking of lumber must also conform to CSA Standard 0141, "Softwood Lumber." Grade stamps usually show the name or symbol (or both) of the grading agency, the species or species combination designation, the grade, the moisture content at the time of manufacture, and the mill number.

"S-GRN" in the grade mark signifies that the lumber was surfaced at a moisture content higher than 19 percent to a size which would allow for natural shrinkage during seasoning. "S-DRY" in the mark indicates the lumber was surfaced at a moisture content not exceeding 19 percent. "AAC 15" indicates a moisture content not exceeding 15 percent.

Facsimiles of Canadian grade marks are shown in Tables 7 and 8.

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