Georgia Pacific Ply-Bead for wainscoating?
I want to add wainscoating to our finished basement. The walls are 2x4 framing 16" on center with vapor barrier and fiberglass batt insulation faced with 1/2" sheetrock. I know because I had to get into one of the walls to change an electrical outlet. The product literature for the ply-bead simply states that it must have a "nailable backing" (studs, furring strips, etc...) and can be nailed directly to the backing or nailed to the backing through sheetrock. I was wondering if it would be better to tear out the sheetrock and install 7/16" OSB in its place for greater rigidity and less potential for wavyness? The 7/16" OSB combined with the 11/32" ply-bead would sit proud of the sheetrock wall but it doesn't matter because I'm going to be putting a "drink shelf" at the top of the wainscoating so I can use a rabbeted trim piece to cover the seam. Using the OSB might seem like overkill, but I actually have more of it than I know what do with. I bought 40 sheets of it for $50 from a sign company that went out of business about 2 years ago and it's been sitting around ever since.