This stuff is thick, heavy, and hard to deal with in big sheets by yourself. Being that it is well made and strong. My crawl floor is not very flat and has some rocks in it so I chose 20 mil to hold up against being ripped.

I used this 20 mil Silverback on the floor of our crawl space due to the excessive rocks. It was the perfect choice as it is tough and won't wear through. The folks at CrawlSpaceRepair.com did an excellent job of guiding me through the installation process. Very easy.

One roll did a 200 sq ft room addition with about 18" going up the sides. Laid it out in the street, taped both seam sides, and carried it over to the open crawl space, Dropped it in and cut the corners. You could build a nice swimming pool with this vapor barrier!

I used 20 mil SilverBack HS on the floor of my crawl space over Felt 550. It is thick, strong, but flexible to work with. Air quality is almost as in my room. I enjoyed working with it so much that now I plan to help my friends do that same thing in their house

Product was just as advertised. Received in just a few days and was a breeze to install.