Dehumidifying Conditioned Attic Air and Exhausting it into Living Space Below
New here and learning a lot:
We are replacing our roof to include adjusting a flat roof to match the existing 5/12 pitch; so we are taking the opportunity to seal the attic using a peel and stick (SA) type underlayment membrane. Our intention is to seal the attic space from the outside by overlapping the underlayment over the sides.
Additionally we run a whole house dehumidifier and would move all the air intakes into the attic space and exhaust dry air into the living area to create a circulation affect, constantly moving the moistest air away from the attic.
My questions is would I need to use spray foam on the interior of the attic space or could I simply use mineral wool insulation up against the sheathing, since the attic space will be sealed from the outside and I will be dehumidifying the home anyways?
Kind of want to avoid the fire issue… Also, the crawl space has already been sealed off with closed cell foam by prior owner, but will encapsulate at a later date and remove foam.
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