William Bronson wrote: The 4x8 sheet got pitched? What was wrong with it?
The four by eight sheets were 7/16 inch Aspenite or OSB (oriented strand board). It's flakes of Aspen trees glued together. This product gives off formaldehyde and is difficult to nail. It wasn't worth much the day it was manufactured. Now, it's covered with a layer of heavy shingles and 1000s of nails.
I tell my customers that OSB stands for obviously shit board. Even good-quality plywood would not be worth the labor of stripping off the shingles and pulling the nails.