Insulating a corrugated metal floor deck
I have a garage on a sloped waterfront lot in zone 6a (lots of moisture). The cement garage floor was poured on top of a corrugated metal floor deck held up with steel I beams. Under the main garage floor is a decent space that I’d like to finish and heat (unsure if I’ll ever heat the rest of the garage). Spray foaming the underside is one option I would assume but its costly. Would polyiso foil faced boards be an option if the seams were well taped or foamed?
Very much appreciate this forum and any feedback!
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