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Old 06-09-2010, 10:48 PM
cn90 cn90 is offline
Officially Welcomed to the 'Fest
Location: Omaha NE
Join Date: Mar 2006
Posts: 14,421
Mein Auto: 1998 528i 5-sp 140K+
Two things:

1. The Vapor Barrier: I think you can use any thick plastic barrier at hardware store. This is the same stuff people lay on the basement gravel before pouring concrete floor. Make sure you get the thicker plastic type.

2. The butyl roll: I got a roll from a local Auto Glass Repair shop: 15-foot roll for $15.
The roll is the same size as the pencil (about 3/16" in diameter). Go to any local Auto Glass Repair shop and ask for it. This butyl stuff was used in American cars from 1970s and 1980s Chevy etc. It looks like this:

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