What kind of foam board should I use to insulate rim joists in Wisconsin?
My home was built in 1927 and at some point fiberglass was used to insulate the 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...