Best 2×6 wall?
I asked a question a couple days ago about a huge remodel we are doing and I wanted to make another post to rephrase my question. This remodel is located in climate zone 5a and is down to the studs inside and out. We have 2×6 studs 16″o.c. I have zip going up as my WRB and paying great attention to air sealing. What is the best way to achieve the highest Rvalue? I was thinking 1.5″ of mineral wool exterior, 2″ closed cell and 3.5″ of mineral wool interior. for around R35. I know you guys say that spray foam is very expensive and very rarely recommend, but I have a good buddy that owns a spray foam company. He is doing our crawlspace already and is giving me a great deal while he is there to do the exterior walls. The cost is $1,500 to do the exterior walls in 2″ of closed cell. Please call me out if this is still a dumb wall design for this climate zone and please let me know what would be the best.
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