Vapor retarder for exterior walls Zone 4
The insulation guys installed un-faced batts in the exterior walls in my house in Nashville Tn. Should I install a smart vapor barrier (certainteed membrain) over the insulation?
– The house was built in 1964 with thermo ply sheathing. As seen in the image the sheathing is very
leaky. I have done my best at sealing the sheathing with caulking and great stuff foam.
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