wall insulation on retrofit...
I'm thinking of residing my house (not sure yet what with), but my question is about how to add insulation. I'd like to do exterior rigid foam and have thought I would use 2" of EPS (due to addl permeability over xps and better R stability over time). I'm in zone 6 and understand I would need R 7.5 (with having 3.5" of fiberglass batt in the wall) of rigid foam, which the eps would give me barely. I would have to do window jam extensions and am thinking "innie" would work best.
The thought of adding blown in cellulose from the exterior has crossed my mind as well, but if I understand things correctly, adding that to my wall cavity in any amount then increases the exterior foam needed. Should I forget about the cellulose? Go with compacted cellulose and skip the foam? -which would undoubtedly be less headache overall as it would avoid most of the window jam extension needed. My wall cavity is 4" wide (with the 3.5" of fiberglass) due to having used non-dimension lumber, giving me room I guess for more cellulose. Any advice on options much appreciated.
Posted Mon, 01/27/2014 - 17:04
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