Zone 5 – Exterior Insulation
Im in Zone 5, in Western MA, about 20-30 minutes from the VT line
My plan is for 2×6 walls, , cdx sheathing, tyvek, 24″ o/c walls, cavities filled with either fiberglass or mineral wool batts.
First (and hopefully last) time builder. I keep reading different answers to this, and am still confused.
Is 1″ of exterior XPS in Zone 5 sufficient? Is it going to cause catastrophic condensation problems? Some places say 1″=R5 is sufficient, some disagree.
Is it 2″ or don’t bother at all?
I found a great deal on sheets of the 1″ XPS, pink stuff. I like the sound of just using 1″ because it wont complicate the windows/doors etc as much.
I’ll be heating with primarily a woodstove and mini splits as backup, if that makes any difference to the equation.
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