Check my wall strategy?
We're about to begin framing on a new house in zone 6A (Minneapolis). From months of reading and following posts here, I've devised what I think is a wall/insulation strategy that will work. Does this look right, or are there any tweaks that could make it:
a) perform better (within reason; we're going after the "pretty good" model, not a Passivhaus)
b) more cost-effective
c) easier to build
The concept (inside to out):
- 2x6 stud wall
- Membrain or similar (6-mil poly if the inspector insists...sigh)
- 5.5" blown fiberglass cavity insulation (BIBS) = R-23
- OSB sheathing
- 2.5" XPS = R-12.5 (1" + 1.5" layers)
- 1x4 vertical rainscreen furring strips screwed to studs
- Horizontal lap siding (fiber cement or smartside)
...for a total nominal R-value of ~35.5, with 35% on the exterior of the sheathing.
Thanks for any analysis and input.
Posted Jul 28, 2014 8:24 PM ET
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