Insulating Basement with Metal Ceiling
We have a walk out ranch and in the basement there is a storage room that is actually located under the front entrance patio. Its a suspended slab with steel beams holding up steel decking, a concrete slab and a brick patio finished surface. When we first moved in we noticed that during especially heavy rains that a few drops of water leaked from 1 spot in the steel decking. I’ve since corrected the issue by sealing the brick patio and upsizing the gutters and haven’t had any moisture for at least 6 months. The space is going to remain mostly storage but we’d like to finish the room to make it more attractive and easier to clean. Is there any issues with insulating up against the steel decking with rigid foam or should I use closed cell spray foam to encapsulate/get direct contact against the corrugated deck? The room is adjacent to the mechanical room so there’s no real issue with heating the space but to the touch the steel is pretty cold.
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