We have a 30 year old roof in New England, which we have begun to interview roofers for this spring/summer.
The topic of plywood has come up and 2 have said we definitely need to replace the plywood even if it looks good. As plywood lasts about 30 to 40 years and we run the risk of delamination and required replacement in a few years.
The other two have stated that as long as the plywood is good and stays dry, it can last forever.
At quoted on 55 dollars per 4X8 sheet, its a sizable cost and so I am wondering if the plywood needs to be replaced regardless of current state.
Best Answer
I would give your business to one of the "is good and stays dry" roofers who are not blatantly trying to fleece you.
Now, the other two may be working from the assumption that if you bothered to call a roofer, you have leaks. But they strike me a lying scammers if they are selling you new plywood with no idea if the roof deck is rotten or solid.
Plywood does not have an expiration date.