I need to re-shingle my shed roof, which will also entail replacing 3 rotting plywood sheets.
Is there a particular type of plywood used for roofing, or can I just use standard 4' x 8' panels? (Haven't measured the thickness yet, but looks like 5/8" or 3/4")
Is it acceptable (or desirable) to screw the plywood to the rafters (2x4's) instead of nailing it?
Should there be some type of underlayment before shingling? Currently, the shingles are mounted directly to the plywood, and they lasted 25 years.