plywood attached on top of a wider piece of ... Drill them 3/4 in. from the “wall” edge and space them about 12 in. apart. Cut a wall cleat out of a straight 2×4, and make it 1-1/2 in.

OSB wall paneling, in other words ... making it difficult to match edges and get leak-proof seams. Plywood absorbs moisture faster than OSB, but it also dries out more quickly, and it isn ...