Will a 12″ double 2×4 wall with fiberboard sheathing perform well in a Cold Climate?
I am building a house using double 2×4″ wall construction. I would like to avoid using rigid foam insulation at the exterior if possible. I was contemplating using a 3/4″ Temple-Inland structural fiberboard, Tyvek, and a 3/8″ rainscreen. The fiber board has a perm rating of 15 or so. With a vapor barrier paint at interior and dense pack cellulose 12″ thick this wall would dry to interior and exterior. I live in Madison WI. According to the 2007 IRC this works in zone 6. The only thermal bridging that is designed into it is a 3/4″ plywood top plate and at windows and doors. I want to avoid rigid insulation as much as possible because of the global warming potential during manufaturing (XPS being the worse, EPS and Polysio slightly better). Any insight on the merits of this type of construction? Thanks!
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