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I went to Home Depot to find some 3/4" tongue and groove plywood for a flooring project and what I saw was this:

RATED STURD-I-FLOOR
24oc
T&G NET WIDTH 47-1/2"
EXPOSURE 1
--282--
RS1-07 UNDERLAYMENT
SANDED FACE
PRP-108
23/32 CATEGORY

The "sanded face" bit makes me think this is an "A" grade face but it doesn't make any mention of the rear face. How can I make heads or tails of the grades on this plywood?

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Sturd-I-Floor is the "Standard/Grade" in this case. It's a little murky for anyone old enough to expect the A-B-C grading. But it's designed for the job you want to do.

http://www.performancepanels.com/single.cfm?content=app_pp_group2

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