I was just out at the supply store where I bought it from and he said the brand is "Moisture Sheild" and it is the same stuff Ziggys carries. He said he's got it for $1.99/foot, but he just bought a bunch of it and it's 5" wide now, not 5 1/2" and it's in 16' lengths. He said he'd be glad to come down and put it in for you for a small fee.
You know, we usually get more snow than you do, but it sounds like you guys have more than we do. We have about 20" on the ground right now and it hit 45 degrees today, so it's a mess. Here's a shot of the scrap steel pile on the side of my dad's shop, under a huge carport. I took this shot this morning when I went out there to use the sand blaster. It's never leaked in 14 years.