12 Mil Antimicrobial Crawl Space Liner

http://andyqpuo794.angelfire.com/index.blog/1631302/what-would-the-world-look-like-without-depth-of-crawl-space-foundation/

The concrete pumped into a crawl space has more water included to it so that the concrete can self level itself. Choosing to have wet, porous concrete set up in the crawl space is like including 300 pounds of water