Should I revisit my insulation strategy? Insulation company told me to cut out the mid-wall smart vapor barrier
I recently had the largest insulation company in my area come out to my new construction house to quote insulating the walls. They immediately told me to cut out all of the mid-wall “Membrain” smart vapor barrier that I had put in place on the backside of the inside wall studs because it would accumulate moisture like crazy.
I mentioned the 1/3 – 2/3 recommendation for insulating, as well as the permeance adjustability of the Membrain (to which he was familiar with), but he was adamant that I would have major problems if I continued on the insulation path I was planning on taking, and had me concerned enough to think about cutting it all out.
Can anyone calm my fears of mold and moisture?
Climate zone 5 (northern Illinois)
Double stud wall construction (from outside->in)
Fiber cement siding
1/4″ rainscreen gap
2×4 outer wall framing
3.5″ to 4.5″ gap (framer spaced east 2×4 framed walls closer than rest of the house)
Membrain smart vapor barrier
2×4 inside wall framing
*both stud bays, and middle gap filled with dense pack blown-in cellulose
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