Great material for your crawl space. Keep in mind that the thicker you go with the material the harder it will be to install around and in the corners. I went with the 12mil.

This product along with mold control converted my dirt filled dark crawl space to a beautiful white clean mold free atmosphere. I told the installer when he completed the job, I would never have considered crawling underneath my house but the 12 mil vapor barrier made it inviting. Thanks so much! My annual termite inspector thanks you too!

Impressive stuff. Very heavy duty. Cut cleanly, went in very well. Not a single tear or puncture in the entire project - which was a tough one. Highly recommended.

great stuff; adheres to more surfaces than any product I've had

My termite bonding company needed to treat the foundation. To treat the crawl space, they needed to poke a hole in my liner every 1 - 2 feet. This left me with 175 - 200 holes to patch in my 20 mil liner. Having applied the tape to about half of the holes, I have found this to be an excellent product. Very sticky and the edges stick very good. I am cutting a piece 2 - 4 inches long and centering it over the hole. I have also patched some seams that have come loose over 8 years. Perfect for my job.