Best way to air seal and insulate floor and wall assemblies
I’m remodeling a house in climate zone 4 outside Seattle. The existing exterior walls are 2×4 with 1×8 board sheathing. I want to achieve the required R21 insulation value without having to fur our the wall to achieve a 51/2″ wall cavity while also sealing the 1×8 sheathing. The subfloors are 2×6 T&G and I want to seal the floor assembly and achieve the minimum R30 insulation value. What would be the best strategy to achieve these goals?
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