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| I think if I were building a new house, I would look at going with an inch or so of closed cell foam, and fill the rest with blown cellulose. From what I've been able to gather talking to a few company reps, you can't totally go by the R-value's, since foam is such a good air barrier. I think the industry talking point is that you can go with a 2x4 wall instead of a 2x6, one inch of foam and fill the rest of the wall with cellulose, and have a better insulated wall than a 2x6 with just the cellulose. There may be other reasons you want to go with a 2x6 wall though. Clear as mud?
Oh, my BIL works on HIGH dollar houses in the St. Louis area. He's working in a house now where they blew foam directly on the underside of the roof sheeting. He says you can't believe how much difference that has made in the attic temps.
Edited by Pofarmer 6/13/2009 08:57
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Lets talk insulation . . spray foams and blown types ~
