WRB and Rigid Foam
Hi Martin/GBA Community,
I’m thinking about installing rigid foam on the exterior with “innie” windows. Would like some thoughts on this set-up, from interior to exterior
Drywall -> 2×4 wall with R-15 Roxul Comfortbatt ->3/4 exterior sheathing -> Tyvek HouseWrap -> 1″ R-5 rigid insulation -> Obdyke HydroGap -> Siding
I’m not sure if a WRB behind the foam and in front of the foam is a good idea. WRB behind the foam because that’s the drainage plane. WRB in front of the foam is meant to provide a small air space behind the siding.
I can install 1×2 batts in front of the foam if needed, but hoping to avoid the extra depth on the exterior.
Climate Zone Marine 4.