Conditioned attic with ventilated roof deck
My sister and her husband recently built their own home and did closed cell spray foam in their attic to make it conditioned space. I like the idea of having the air handler and duct work within the envelope, however the price is steep and the inability to inspect the roof deck worries me.
My wife and I will be building our own home soon and I was wondering if it is possible to make the attic conditioned space while still having a ventilated roof deck, treating it like a cathedral ceiling. Is this possible to do with rockwool insulation to allow any vapor to get out? Would the attic have to be drywalled? I am in climate zone 5.
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