Thanks for the info, guys. Homebuild, I have read that 2x6 walls allow for an R value of 21. As far as I know, 1" foam typically has an R value of ~5. When you say that 2x4 walls with 1" of foam on the outside "increases the insulating factor much mor greatly than simply increases the wall dimensions to 2x6," is that simply because the exterior foam is contiguous, as opposed to the batt insulation which is broken up by the studs? By rough calculation, 10% of the wall by length would be un-insulated with 16" OC construction, so that R21 with the 2x6 would average out to more like R19, all things being equal. |
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