If you don'
t have HVAC and ducts in the attic,
spray foam on the roofline isn'
t really necessary. I'd blow insulation on the attic floor (after air-sealing, of course). The big disadvantage with
spray foam is cost. It's generally 3 to 4 times what you'll pay for blown
cellulose or
fiberglass.Sep 27, 2011
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