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Unread 04-24-2007, 11:00 PM   #12
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Join Date: Nov 2003
Location: LaConner, Washington
Posts: 13,694
JerseyReef (Mike) a member here recently posted purchasing some plywood Sheathing panels stamped PRP-108 (see picture below). With no veneer grades on this stamp such as C-D or C-C, he contacted the APA (American Plywood Association) for additional information on this panel.

APA response was that Exposure 1 Sheathing manufactured under either PRP-108 or PS 2-92 standards is equivalent to a DD grade. The full text of that response is in this post here:

Clearly then, plywood stamped APA Rated Sheathing, Exposure 1, PRP-108 or PS 2-92 is not suitable as sub-flooring or underlayment under a tiled surface.
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