Question: I've been planning on making my home more energy efficient by adding another layer of insulation between the ceiling joists of my one-story home. A friend of ours, visiting from Florida, told me about a new type of insulation that's being used in his area. The insulation is a type of aluminum foil called a radiant barrier. My friend has it in his home and said his air conditioning costs have gone down and his home is much more comfortable in hot weather. Do you know of any sources for this radiant barrier in Southern California?
Answer: What your Florida friend has may be new to him, but it's been around here for a long time, according to my sources.
It's called Type C foil and it was used extensively in the days when roll insulation came backed with kraft paper. Today's insulation is typically foil-backed, reducing or eliminating the need for radiant foil.
The product is available at Fleming Lumber Co., 3250 San Fernando Road, in two forms, according to Joe Windsor at Fleming: Foil one side, 36 inches wide, 500 square feet, about $17, and two-sided foil, 24 inches wide, 144 square feet, about $19.