Whether or not install house wrap on existing unique wall assembly
The basement (from interior to exterior) is 12” block, core filled, with 6” of “Dow Blue Rigid Foam Board” on the exterior, below grade.
The North, East, and West walls above grade (from interior to exterior) are 8” block core filled, 6” of “Dow Blue Rigid Foam Board”, and a 2×4 stud wall (strapped to the block) with fiberglass batt insulation and ¾” plywood sheathing. The plywood has tar paper and original cedar siding.
The South wall is primarily windows and is constructed (from interior to exterior) of ½” plywood sheathing, 2×4 stud wall with “Dow Blue Rigid Foam Board” in between the studs, 2” of “Dow Blue Rigid Foam Board” continuous insulation, and ¾” plywood sheathing. The plywood has tar paper and original cedar siding.
After living in the home for a year, I found the home to be quite drafty. I had a blower door test done and found that almost all of the windows had severe air leaks.
Now to my question, I am replacing the original cedar siding and windows. My initial thought was to wrap the exterior sheathing with Tyvek house wrap and use their system to flash the windows. However, after reading several articles on GBA I became concerned about possible condensation issues. Should I be concerned wrapping the walls in house wrap?
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