Spray foam

[allstihl]

sounds like you should be spraying the band joist , not the floor .

 

[NSMaple1]

sounds like you should be spraying the band joist , not the floor .

That's what I was trying to get at, asking about walls. (Extending up all the way to underside of floor). I expect lots of air leakage. Maybe even stone foundation? So if the floor is sprayed, cold air will still be moving through down there and something just might freeze. But we haven't heard about the vertical parts yet.