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05-19-2012, 10:56 PM #14if the seal behind the FRP is so important it sounds like I should but vapor barrier on it too? But that goes against what I've always been told about totally sealing up a wall.
Vapor barrier goes on the warm side, in this case the outer side of the insulated wall. But isn't it the same as a house were you want the cool side able to breath a bit to remove what moisture leaks in the wall ?