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If you can just do a properly sealed poly layer that should take care of it, or turn the temp up.
Up here there are a couple of foam types, with different moisture permeability, You need to make sure you do not trap moisture or you will get rot. I do like fiberglass insulation because it does not burn, but I did get some tricky to seal areas spray foamed. Before you spray foam check with your building department if you need to cover it with drywall to be code compliant.
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