That close cell insulation sprayed directly on a dry metal roof will not trap any moisture at all. It sticks like paint would and there is no air pockets. Then the bottom seals itself. I had to put in a chimney on one of the roofs we had spray foamed. I had the piece I had cut out to fool with. I tried getting the foam off that piece. It was about impossible. You can not scrap it off a very wide section. I finally took a hand saw and cut across right beside the metal. Then with the foam only being a 1/4 thick I could scrap it off the metal.
My reason for seeing if it would come off was thinking if I ever had to replace the metal roof. So buy good metal as it will not come off.
A spin off I noticed right away was that it stiffened the building's roof structure. My shops both have a full six inches in the ceiling. They both have four inch purlins. So the foam completely covers them. When it is windy now the trusses do not move any at all. Before they would move some. I mean HIGH winds 50-60 MPH.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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