carolines truck, the headliner is sheet metal, I don't know about the rate being constant or not. I think it expands to fill a void and stops at resistance. Where ever it goes it can be cut away if visable.

SW Radial, The idea is the same as your house. Surely the stuff doesn't rot the walls of our houses from trapped water?

Thanks for the replies.

Dave.

What's the last thing a red neck says, "Hey guys watch this."
What's the last thing a redneck hears, "Go ahead Bubba, you can do it."

Build plan: 65 Chevy one ton, 5.9L Cummins HO, NV5600 six speed, 2wd 1972-1987 IFS disk front, frame off restore/mod, custom dump/flat bed, Alcoa rims, Dana 70 3.73:1 duals drum rear, plush interior, Guards red with Marine Corps decals. Donor is retired 2002 Ram 2500, 194K miles.