Went to a roofing supply...not Lowes/Depot...and found some really great stuff.
Roof Underlayment, is 3mm thick and peel off plastic on one side.
I use it for lots of sound proffing, heat barrier type jobs.
Floor board in Eldorado was first, and inclosure for generator door.
Works great and much better price.
Get the kind without granules.
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1989 Airstream 345 Liberator...
1972 Argosy 24'...
1954 Feathercraft Vagabond