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Floyd County, Iowa | Yes, since foam is non-permeable. The real problem is that any moisture that would form between the foam and the steel would be trapped and corrode the steel. An air gap behind the steel is best, if it can be done. If you put the foam sheathing on the inside of the wall girts, and the steel on the outside, you'll have that air gap. But I wouldn't put steel right over foam. The vapor barrier should always be to the heated side of the insulation, whatever that insulation is, since moisture normally migrates outward from the heated space, and will condense when it meets a cooler surface if it's allowed to migrate. | |
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Cold storage vs shop.
