Vapor barrier on the inside against sheet rock or outside against sheathing or both sides of rock wool?
I’m doing a rehab remodel on a house I recently bought and have the exterior walls exposed on the house. I’m trying to upgrade the existing insulation since I had to replace quite a lot of the framing to repair dry rot. I’m trying to minimize moisture buildup in the wall spaces from both directions as well as effectively insulate the house. Plus, I’ve been getting clobbered on utilities.
I’m installing Roxul rock wool R23 into the 2×6 stud cavities. I’m going to be installing osb sheathing over top of that, because that is what the engineer is requiring to buildup the sheer strength. Over top of that, I’m going to be installing Rmax Thermasheath-3 2 inch R13.1 over the sheathing. Lastly, I’m installing waterproof paper for the stucco that I am cladding the house with.
I have been doing quite a lot of reading and really getting more confused. Should I install a vapor barrier against the sheet rock before placing the rock wool or after I place the rock wool? Should I put an additional wrap outside the sheathing to protect it?
Lastly, is there any other recommendations or tips, anyone can pass along.
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