Interior air barrier/vapor retarder
Quick run down. Climate zone 5A. Wall assembly: 2×6 studs, R23 rockwool, 7/16 zip, 3″ rockwool comfortboard, furring strips, siding. Question is do I need to use an interior vapor retarder other then my interior drywall? Should I use a product like Certainteed MemBrain as a secondary air barrier and vapor retarder? I am doing a blower door test hopefully this week and am shooting for 1ACH50 or better. I have been doing a lot of research on here and when it comes to wall assemblies and vapor I still get confused but I am learning.
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