icynene foam insulation
if it were mine I would have a regular (not vaulted) ceiling put in
and insulate the crap out of it. My second best choice is the drop
ceiling with lots of insulatino. 2" of insulation is everly
inadequate in NY. I'd want at least 12" of insulation, but since you
most likely have the space I'd want something much greater than that
even.
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