12 mil is good solid material, but it seems to have acquired wrinkles as it was rolled up and the wrinkles hardened into deep, sharp creases that could not be removed. Tried hot air to soften the plastic with little success. As a consequence, it is simply not possible to tape seams securely. Tape can't follow the profile of the creases

Well, I bought it twice in a row. What does that tell ya? Good stuff. Good performance.

BUY THIS AND DO IT YOURSELF.

Challenging crawlspace with wall height ranging from 2 to 3 feet very hard to work in. The product performed flawlessly, and my wife and I were able to install it easily in a couple hours. The foundation tape held the Silverback in place while we maneuvered the roll. The foundation pins went in smoothly and hold the barrier firmly in place. Finished taping the seams and it looks great. I would recommend this system to anyone. We noticed an immediate difference in temperature and humidity once the product was in place. Better than advertised and the assistance we received when ordering was top notch.

 

The humidity in our house was hovering around 65 to 70% and now it's below 50%, without the use of a dehumidifier! It was not an easy task and it gave me the creeps seeing mice in there, but now that it's clean and done, I'm delighted! (And saved $3400...) Thank you so much for your support.