Thermal Tape between rib and shell

Hiya.



Building Airstream from Scratch project guy here.



I found this video on current construction methods.



http://ift.tt/1fToYuf



It mentions a thermal tape used between the ribs and shell to inhibit thermal transfer and condensation. I like this idea.



1. Do you like this idea?



2. Where on earth can I find 1.5 inch to to inch wide thermal tape?



Thanks for any tips.