One of my subs is recomending 4″ of sprayed in foam insulation for the cathedral ceilings with 2×12 rafters.He says that venting the roof is not necessary. Finished ceiling will be T&G pine. For the gables and dormer walls he says that 2″ to 2-1/2″ of foam is good. Home is located in southeast Michigan. I’m new to foam insulation, any experts out there?
Drawings and details for building a high-performing slab-on-grade foundation, double-stud wall, and truss roof with nontoxic materials
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