Quote Originally Posted by jamesneuen View Post
That spray foam is nice but it's EXPENSIVE!! The house designs I looked at use a "false" wall that is spaced a foot in from the real one. Then you fill inbetween with loose fill cellulose and do the same thing on the ceiling. The only major design differences I saw were that you have to access the attic from outside the house, no recessed lighting fixtures, an insulated slab and I would have to pile more than a foot in the ceiling so that I could refill the walls as they compact down a bit.
Spider from johns manville is a moist blown fiberglass that won't settle like cellulose does, and doesn't have any of the nasty chemicals like cellulose does. Remember cellulose is newspaper, and it has to be treated for fire resistance.