Exterior Rigid Foam and Mineral Wool in Stud Cavities
Thank you for this wonderful website. I have learned much here but have a remaining question.
I live in NY close to NYC in zone 4 and have 4” of rigid foam on the exterior with 2×4 framing and nothing between studs. I was thinking of adding mineral wool between studs.
My dad thinks that 4” of foam on the exterior is good enough and mineral wool between studs moves the dew point further inside which could get the mineral wool wet and tender it useless. Furthermore, there could be a danger of mold behind drywall because dew point is further inside.
Does that make sense?
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