What kind of foam board should I use to insulate rim joists in Wisconsin?
...rim joists. I've started to remove it because its become a home to mice in some places, and just plain not working in others. But what to replace it with?
I'm leaning toward 4" of polyiso, with a <25 fire spread. It won't work as well at low temps and will lose some R value over time but I think I'm properly compens...