Exterior insulation with steel studs and foil-faced drywall
Hi, I’m looking to add exterior insulation to my 1960s ranch. (Climate Zone 5)
My 2×4 exterior wall assembly:
– Steel stud
– Cavity insulation (fiberglass)
– Foil-faced drywall
– Latex paint
I’ve read that foil-faced drywall is similar to poly, and is considered vapor impermeable.
Would moisture problems be likely if I installed 1-2 inches of foam/poly iso in this scenario?
Additionally, does anyone have experience fastening siding to steel studs? I was considering self-drilling screws, but perhaps wood strapping screwed to the studs, and then siding nailed to the strapping would work better.
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