"Keep the foil side of that insulation at least 1 inch away from your roof" ??? Umm, the insulation goes above/behind the headliner. There is no 1" space. There is NO space. Have you ever installed one of these, Jon? They're a bear to get in just using flat insulation! Plus, what was installed in my truck was original, and it was glued with some sort of adhesive to the roof. Fleece/rockwool is what came out of it. I disagree with your comment that it's only good for the dump. I don't need space age stuff in my '71 year old truck. As a retired welder, I know all about how heat works. The fleece material that I pulled out of it, and then ordered from classic parts is the same material they use to insulate welding gloves. It worked for me for 40 years. But thanks for your comment. Lee
