I'm going to be stripping the terrible old siding off of my house and wrapping it with rigid insulation and finishing with strapping and vicwest steel cladding. Here's the dilemma, I want to use Energy shield (ISO), probably 2.5 inches thick for the maximum R-value while still maintaining simplicity in the furring details. But my house was built in the 70's and is of 2x4 construction, and it has a 6mil poly stapled air barrier beneath the drywall, and I'm afraid that I will end up with moisture problems down the road.
Does anyone know a way around this while still sealing the Energy Shield or am I stuck with using XPS foam instead and settling with a lower R-value??
I would prefer not to install an HRV.