The double vapor barrier sounds like a bad idea as well as not having the sheathing directly attached to the studs. That's a major code violation and for good reason. You will HAVE TO install let in bracing or else your house will lean over. Why not just put all of the XPS on the outside of the sheathing?
Also this should have its own thread. If a mod would be so kind as to split this up?
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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