On the 2009 IECC page for MA , I see Basement Wall R-value c 10/13.
Are those the values for a walk out basement too, where the back and part of the side walls are exposed?
Want to make sure I understand this, the continuous sheathing R value of 10, that's when you have no gaps in the insulation, like what you'd have with studs against the wall, right? So, if I use the technique in this vid , I'll only need R10? Is the idea that if you don't have thermal bridging, you don't need as high an R value?
If you were insulating a basement in my climate zone, do you think R10 is good? Or would you go for an R21 solution like the one shown in this vid ? Or, would that be overkill?