Zone 2 , 3” ext insulation on roof vs 2” on roof and 1” on walls
I am building in zone 2. Savannah ga. I want to add exterior foam and can likely only afford either 3” on roof or 2” on roof and 1” on walls. I have 2×4 walls and 2×6 roof. I will spray foam open cell on both. My living room is large with cathedral ceiling.
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