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Working on a 70 x 110 pole shed. The customer wants to use spray foam insulation. I have found conflicting information, from the installers even, regarding the use of house wrap in conjunction with spray foam. Some do not want wrap, claiming there will likely be condensation between the wrap and tin, leading to eventual rust. One installer wants wrap, saying he has seen foam adhere to tin, then distort the tin as it dries down and shrinks slightly. One other concern I have is the ability to replace a section of tin should it become damaged. Obviously, if the foam has adhered directly to the tin this will be a difficult task. Any input appreciated.
 
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