With Zip board as sheathing/WRB, any danger Intello Plus behind drywall will act as 2nd vapor retarder?
Our wall assembly will be the following (interior-exterior):
Intello Plus vapor retarder
2×6 studs filled with Roxul batts
Zip board sheathing
4″ Roxul comfort board (2″ + 2″)
1×6 cedar siding
We’re shooting for a Passive House level of air-tightness, so is there any risk the Intello and Zip board sheathing could trap moisture in the wall assembly?
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