Minimum thickness of exterior insulation – when NOT using foam.
We understand the logic behind this article regarding calculating minimum thickness of exterior rigid foam insulation in terms of preventing wet walls.
Our question is: In zone 6, if we have R23 Rockwool batt in the cavity, and use Rockwool Comfortboard 80 for exterior insulation instead of rigid foam, would R6 be adequate here instead of the R11.25, given that this assembly would be more able to dry?
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