I used 1 roll of the 12 mil and larger roll of the 20mil. Both are fantastic. I had old clear 6 mil, which I went right over. Once I had the entire floor covered, even before taping the seams, I could feel and smell the difference in moisture reduction. I followed all of the videos and written process.

product is great, does exctly what i needed it to do. my nly problem is what it costs for shipping...

Definitely a great purchase. They worked perfectly. I just used a hammer drill with a masonry drill bit, drilled into the block as well as the mortar joint. It was real easy to do. I also used the Foundation Seal tape when I could get it to hold and the pins where needed.

Best tape I have found for this application. Easy to work with, wide enough to provide a secure seal. Seems to hold well in the short time I have had it installed.

THIS AND ALL THE PRODUCTS I PURCHASED ARE TOP QUALITY.