floor pulled away from foundation leaking air under baseboards
My house leaks copious amounts of cold air in the winter from underneath the baseboards only in the part of our house that has no basement and is standing only on a concrete slab. I am preparing for hw floors to be installed in this area and I have pulled the baseboards off and pulled back the old carpet. There is at least an inch gap where the floor slab appears to have pulled away from the outside foundation. I can see dirt between the floor and the outside wall. Is there supposed to be an airspace here or would it help to put some sort of insulation, expanding foam or something in this gap? There are spots where I can't even see bottom, just looks like empty space going way way down into the ground somewhere.