Charlie,

The insulation I used came from The Pep Boys. It has a plastic foil-type material on both sides of the air cells. I attached it with 3M super spray-on adhesive (joining pieces of the material under the roof braces).

Sorry about my site having bad connections. I sometimes have the same problem and cannot figure it out.

http://www.1954advance-design.com/Photos/Reassembly/slides/14_ceilinsul1.html