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Plywood is graded A, B, C, or... | Almanac.com

Plywood is graded A, B, C, or...

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Plywood is graded A, B, C, or D based on the defects in the wood surface. Grades C and D have knotholes, but the knots are larger in D. In A and B, knotholes are patched and the surface of the sheet is sanded. Only an occasional patch will appear in grade A.

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