So when I had my headliner recovered, the insulation was all dried up and falling apart. So it's had a hollow sound in the cabin during rain and during the temps of hot and cold, it has been extreme and fast to change in the elements surrounding the bare roof. So I finally tackled the job very similar to my hatch floor using the light weight frost king stuff. I also added a layer of reflect'o stuff that was light weight as well. Here's @[email protected] showing the headliner removel. Then my pics of my install. View: http://m.youtube.com/watch?v=moQCI5aIuf0 The frost king comes self sticking so it was easy to apply, it acts like a sound deadner and has climate resistance. I used 3 strips, 1 in front, 1 in back then used the 3rd one to interlock them all. Aluminum tape is used around all the edges as possible. Then I doubled up with the thermo reflect'o stuff, it's really light as well. It's wider, so I only used 2 strips and then sealed it off with the aluminum tape. So when I was done I tapped on the roof afterwards and it had a completely solid sound!! Pretty impressed with the sound characteristics and it also being climate control material, it should be a MAJOR difference in my cabin climate temps in the hot and cold. Summer is coming up so I needed to get this done so for under $35 bucks I got some some [email protected] climate control and sound deadner help!!