Quote:
Originally Posted by UncleWede
Outdoors
This plywood is A/C
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A/C, alone, doesn't mean it is suitable for outdoor use. That is just the surface ply "quality" designation, i.e. one side is A grade, while the other is C grade...like what you show in your photos where one side has all of the knots(C) and the other doesn't(A).
For it to be suitable for outdoor use, there need to be additional designations, which vary by manufacturer and will say things like "exterior", "exposure x", "x"...you pretty much have to look up the manufacturer's spec sheet to determine what it is. To take that further, most plywoods that have an exposure rating can only withstand that exposure a limited amount of time before they begin to fail and delaminate.