Another Rim Joist Insulation Question
Newbie here: Please correct me if I am wrong. I want to use XPS for the rim joist area in my basement. Do I just cut the desired shape and then fill the sides with Great Stuff or caulk? Do I need to place the XPS to the complete back of the area or can I place it in the front because some areas are extremely deep and not accessible? Do I still need bat? I live in Chicago land area.