Dense-Pack Cellulose Cathedral Ceiling
My roof (zone 3B) needs insulation, but between Martin's concerns and the inexperience of the contractors in this market, I am conceding that 5" of polyiso foam isn't going to happen. I think that 3.0" nail base (R15) can though (with taped seams). I'd like to get closer to the code minimum of R30 for the assembly. I would rather not tear out the finished interior vaulted ceiling (cedar shingles on battens on felt paper, I know, strange), but the lousy interior air barrier (i.e. the felt paper) concerns me. Given that 4" of dense-pack cellulose is air permeable, how big of moisture risk would I be taking in this climate with this assembly?
Posted Aug 14, 2014 2:44 PM ET
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