Highly recommend the 20 mil for the floor of your crawl space. If you can afford it, use it on the walls as well. It is heavy duty and really makes a difference. Strongly recommend making accurate measurements and cutting it in a place where you can stretch it out as it comes folded onto itself.

I was a bit concerned when I received the shipment of the roll that although it was 80lbs it didn't look quite wide enough to do the job. However, it's amazing just how tight they can roll that stuff as it was not only adequate but quite thick. In fact, we had to devise some creative ways of applying for long rolls. Very nice product, no smell at all, appears it will last for many years.

Went up easy and seals crawlspace perfectly

This 12 mil vapor barrier is excellent quality and seems extremely durable. I have put down a little over 2000 sq. ft in my crawl space. It is flexible enough to work with, but very strong. It was shipped extremely quickly and came VERY well packaged. I found the price to be completely reasonable. I highly recommend it.

This is a good product that performs it's job well in a crawlspace. The only drawback is that it's so thin that when you get down to a third of a roll it gets a bit harder to use. Tip- always order an extra roll for three you think you will need.