Spray foam and abating moisture issues in Zone 4
I am remodeling a home outside of Seattle, WA. I plan on spray foaming the existing 2×4 exterior walls with closed cell spray foam (looking for R-24) and plan to frame out a new interior wall (probably 2×3).
I’d like to install a 2″ polyisocyanurate board in the gap between my existing exterior wall and new interior wall to add a continuous R-13 across the faces of my exterior wall studs. The polyisocyanurate will be caulked to the studs, to each other, and joints will be taped.
I am concerned about moisture collecting on the interior of my wall. Any tips or suggestions on managing moisture entering the interior of the wall? I am eager to keep my home air tight, insulated, kill sound from a busy nearby street AND keep from growing a nice mold farm inside my wall.
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