Insufficiently thick exterior foam: Remove, increase, ignore?
I've been reading the articles on GBA about exterior foam and I think mine is too thin to keep the sheathing above the dew point. I'm wondering your opinions as to the best remedy. I'm assuming that removing or increasing the thickness will both be expensive. I believe my wall assembly is risky, but have no evidence it is actually a problem. Given that I'm wondering if the best course of action is to live with it. Here are the details:
- 2 x 4 walls
- .75" polyiso
- Plywood sheathing
- No rain screen
- Stud cavities filled with fiberglass batts
- No interior vapor barrier
- Climate zone 6 (Cabot, VT)
Greatly appreciate your thoughts.
Posted Mar 19, 2017 5:26 PM ET
Edited Mar 20, 2017 12:41 PM ET
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