How much spray foam in wall cavities? If any.
200 sq ft tiny home. 2×4 framing. 2×6 rafters. One inch of exterior insulation with zip r. Two inches of rigid foam board in the roof already. I had a gentleman give me a quote on spray foaming the inside. He recommended three inches in the roof and only batts in the wall cavities. He said he would recommend this to save me money on foam and labor. And because I’ve already sealed the sheathing joints and between the framing members. Is this true? Would it not be worth the money to have spray foam versus batts in the walls?
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