The roof decking could be the layer of plywood or O.S.B. nailed into the trusses or rafters. Roof decking is often 7/16” and comes in four’x8’ sheets. If you’re tearing off old roofing, the roofer can look for damage that should be fixed when the deck is bare. By 1857, Chicago was Illinois's most significant town.[31] Along with the larg