I apologize if this is not the correct forum for this question.
What thickness and grade of plywood should be used for my roof decking?
I own a bungalow that was built in 1960. My 25 year shingles have just about fried off (in 14 years) and every time I go up there to check things out the roofing plywood is so weak I think I am going to end up in the living room. The boards are not rotten, they are just too thin or too weak or both. I have decided to replace the roof, plywood, shingles and all. Is there any advantage to using plywood over OSB? Will I get better cost vs performance with OSB?