GAF’s warranties are more stringent than CertainTeed’s, so there are much more good reasons for your company to deny you guarantee Rewards. The roof decking could be the layer of plywood or O.S.B. nailed for the trusses or rafters. Roof decking is typically seven/sixteen” and comes in four’x8’ sheets. In https://rafaelpakve.pages10.com/the-basic-principles-of-metal-roofers-64513998