I am in the process of buying a 1,400-square-foot home in Zone 4 (mixed humid climate). The existing wall section is: brick veneer, 1″ air gap, tar paper, plywood sheathing and 2×4 walls.
Most of the deep energy retrofits I have researched include installing exterior rigid insulation, which is probably out of the question for me given that I would either have to tear the brick down or bury it under the insulation and new cladding. So I am considering creating a double-stud wall on the interior at a total depth of 10″, then filling with dense pack cellulose and airtight drywall.
I think this allows the best opportunity for substantial R-value and drying potential to the interior and exterior. (If I’m wrong please let me know).
My question is mainly how to approach air sealing before insulation. I am trying to avoid spray foam but would it benefit me to flash the stud cavities first? Or maybe just around the perimeter of the cavity?
I don’t think a fully flashed stud cavity would allow any drying to the exterior which is recommended in my climate (as well as to the interior). Any recommendations for air sealing from the interior or issues with the other details provided below I would greatly appreciate the feedback.
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