On the 2009 IECC page for MA LINK, 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 LINK, 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 LINK? Or, would that be overkill?