Interior insulation (in stud bays) when we have exterior insulation?
This is a follow up to the question we posed here http://www.greenbuildingadvisor.com/community/forum/gba-pro-help/26143/v... but our problem is a little different. Here are the relevant details of our house:
We're in Zone 5A, building a new house which has already begun construction. We're nearing time for insulation, and realizing that we cannot afford the blown-in cellulose we were planning on using with a Membrane vapor retarder.
Our exterior has plywood, tar paper, 1" of foil-faced polyiso foam, and red cedar shake. The framing is 2x6 wood construction. The interior will be heated with wood stoves only.
The only insulation that fits our budget now is to use fiberglass, and all the companies where we are (Cape Cod) only install batts. My questions are: 1) is it okay if we install fiberglass batt insulation? (The best quote we received was for R-21 for the walls using unfaced batts with polyethelene vapor barrier, and R-38 in the ceiling eaves). 2) what kind of vapor retarder, if any, should we use/specify?
Looking again at the best fiberglass quote, I see that it says explicitly "unfaced batts with polyethelene vapor barrier" - is that a problem?
Posted Mon, 02/25/2013 - 19:35
Edited Sun, 03/03/2013 - 07:37
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