Retrofit existing 2×4 uninsulated stucco wall
I’m looking at a conversion of a free standing garage into conditioned (heated) space. The structure has stucco over tar paper, directly over 2×4 studs, no insulation, no sheathing. The goal is to have a painted drywall interior.
Right now there are no moisture issues, I’m guessing because any bulk water or condensation that enters the space is dried quickly with the lack of insulation. The goal is to insulate but not make the structure more susceptible to water damage. And ideally, not remove the existing stucco. I know that if the stucco is removed, a whole host of options are presented.
What is the recommended wall insulation retrofit for this space?
The ceiling is also uninsulated, but it can be turned into a drop ceiling with a vented attic, air sealed from below with blown in cellulose.
Climate zone 3 coastal, zip code is 95017. Structure is 440 SF, existing slab on grade.
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