Vapor Barrier for Double Stud Wall with Batts
I am considering some alternatives to dense packed cellulose for a double stud wall assembly in case I have issues finding a competent contractor. I am looking at a DIY friendly approach. I know batt insulation has been proposed on GBA in the past, but I have a specific question about using a kraft faced HD fiberglass batt as a mid-wall vapor barrier.
The wall assembly from the outside in:
1) Vinyl siding
2) Fully adhered or fluid applied air tight/vapor open WRB
3) 1/2″ Plywood
4) 2×4 stud wall (load bearing) with kraft faced HD fiberglass batts (R15)
5) R15 Rockwool in 3.5″ cavity
6) 2×4 stud wall with R15 Rockwool
7) 1/2″ Drywall with latex paint
I am trying to avoid using Intello or other sheet goods. My thought is other than a hose bib or too and outdoor lighting there should be few penetrations to worry about in the exterior wall. The WRB would be the air barrier. And R15 should be enough to avoid condensation at the inner surface of the outer wall in Zone 5.
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