What kind of foam board should I use to insulate rim joists in Wisconsin?
...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 compensating by installing 4". (2x 3" layers) It seems that XPS would be the al...