Is extra insulation in stud bays worth it?

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Is extra insulation in stud bays worth it?

I am planning to use Superior Walls “Xi Walls” for my first floor, which will be daylight on three sides. These walls are 10 ¼" thick, with 1 ¾" low-water concrete shell on the exterior, then 2 ½" of DOW Styrofoam that, according to the website, results in an R-value of 12.5. However, there are concrete studs at regular intervals that are wrapped with only 1" foam, as are the top and bottom beams.

Filling up the bay with cellulose would result in an R-value greater than 36. But given that the studs would still just have 1" of foam, would it still be worth spraying in the cellulose?

Climate Zone 4. Thanks!

Asked by David McNeely
Posted Fri, 12/07/2012 - 16:07