View Single Post
Old 04-25-2007, 12:00 AM   #12
Mike2
Registered User
 
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: http://johnbridge.com/vbulletin/show...1&postcount=56

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.
Attached Images
 
Mike2 is offline