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Plywood grades

Posted by Bruce M on July 7th, 1998 11:34 PM
In reply to Plywood "grades"?? by Bob L. on July 6th, 1998 11:33 AM [Go to top of thread]

Hi Bob
The first two letter refer to the quality of each side of the plywood, with the last letter indicating if it is rated for interior or exterior application.

CDX, means that one side of the plywood is 'C' grade (either all knots are plugged or there are fewer than a given number of exposed knots....I can't remember), the other is 'D' grade (knots are not plugged) and the 'X' means it is using glues that are rated for exterior use...usually as sheathing for exterior walls or a roof deck.

AC plywood is usually finish grade, with the 'A' side straight grained and without knots, and BCX is used where the 'B' side has all knots plugged and it is exposed, as in soffits.

This is from memory, so if anybody has better info, please post....but I think it is correct :-)


Bruce M

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