Kraft or unfaced batts with flash-and-batt insulation
So two quick questions. I’m having 2-2.5″ of closed cell sprayed today on my walls, based partially on some helpful information from a prior post. 75% of my walls are 2×6 with the remaining being 2×4 walls, I’m located in zone 5 (on the border of zone 6). My question is whether I should fill the remaining 1.5 or 3.5″ with kraft faced or unfaced batts (since I’m doing that part myself). There’s no difference in cost, so if the kraft faced is better, then I’d definitely go that route. But, I didn’t know if that could potentially be worse for whatever condensation reason.
One other unrelated question. The closed cell they are spraying is apparently some sort of water based product, the contractor said it’s a newer blend that isn’t nearly as bad as far as fume go, etc. I’m not familiar with that product (or really any spray foam product for that matter). I was just wondering if the R-value as good and are there any downsides to a product like that (without knowing the specifics of the blend of course). I know people on here were talking about how bad the typical closed cell is for the environment and how it loses R-value over time, just wondered thoughts on what my contractor might be using. Thanks!
GBA Detail Library
A collection of one thousand construction details organized by climate and house part