Originally Posted by Bob Mariani
you do not want a barrier like poly against the concrete wall at all. Warm air in the winter will hit the cold wall and condense. The moisture will be trapped against the poly and destroy your batt insulation. (which is also an bad choice) You need at least 2" rigid foam against the concrete wall to act as a thermal break and to keep this wall warm enough to prevent condensation. It must be completely sealed.. seams and edges with caulking or spray foam and tuck tape.
Bob, Im also in Connecticut and would this be your recommendation for the floor as well?
Rigid Foam board insulation then plywood as a sub floor without poly under the foam?