Jorge writes from Wilmington, Delaware: "I live in a 50 yr old split level home and down stairs in the conditioned family room one of the walls is half masonry half drywall (if you're looking at the wall the upper half is the main level and the lower half is the foundation wall that faces the crawl space) and it's always colder than the rest of the house. Should I or can I insulate that wall to keep the hot air from escaping into the crawl space and keeping the cold air from coming in, and if so how? The sub floor is already insulated w/r19 insulation. Any advice would be greatly appreciated."

Answer: That's another easy one, Jorge. The answer can be found on the Owens Corning website. Click on the words Basement Walls and Foamular® Rigid Foam Insulation for Basement Walls you will see instructions for the project you describe, including pictures. One page describes the process for using PINK fiberglass insulation and the other one covers PINK foam insulation. Either method should help keep that space warmer.