Insulation Retrofit

Insulation Retrofit #green

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 2x4 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 caviti...

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