Donna writes from Corbin, Kentucky: "Residence with walk out basement was built without completing the insulation "envelope." There is approx. three feet of space between the basement's dropped ceiling tiles and the floor joist of the 1st floor. The HVAC unit is installed in this space. The poured concrete exterior perimeter walls are not insulated at all in this space. The basement interior perimeter walls were stripped with 1x and appear to only have foam insulation behind the drywall. What would the most efficient insulation method be? Frame with short 2 x 4's so standard batts with vapor barrier can be installed? Or a foam board with at least R13 rating that doesn't need a fire retardant over it? Or have foam insulation applied to the walls? Won't some framing be necessary to help hold it in place until it sets?"

Answer: For detailed explanations with pictures of two options, click on the words Basement Walls and Foamular® Rigid Foam Insulation for Basement Walls. One page describes the process for using PINK fiberglass insulation and the other one covers PINK foam insulation.

Because this is a unique application and your questions are many, it will be best to call Owens Corning Customer Service and discuss the project with a technical representative. The number is 1-800-Get PINK (438-7465).