The roof decking is definitely the layer of plywood or O.S.B. nailed towards the trusses or rafters. Roof decking is usually 7/sixteen” and comes in 4’x8’ sheets. If you’re tearing off outdated roofing, the roofer can hunt for damage that should be repaired as soon as the deck is bare. https://elliottzehk.wikilima.com/680838/considerations_to_know_about_downers_grove_il