Where in a wall do you put a vapor barrier in Chicago?
I live in a 1970's era raised ranch in the metro Chicago area. The foundation walls raise 4.5 feet above grade. The floor joists on top of the wall extend out 30 inches from the foundation wall. There is an overhang, common in a lot of raised ranches. I want to insulate this "overhang" area. The floor joist is 7". So 2 batts will fit in the area. What to do about a vapor barrier?? I can place a poly sheet at the top closest to the floor of the upper level or at the bottom on the side closest to the outdoors. Or I can maybe put on some vapor retardant paint on some of the surfaces. I hope my question and explanation is clear and there is an opportunity to respond. I look forward to your advice.
Thank you, Joel Peterson