Next, you need to make sure the crawl space doesn’t have an open dirt floor. If your crawl space has any open dirt space underneath it, which may be the case for some or all of your crawl space, it’s important to have a JES expert place a CrawlSeal™ vapor barrier liner. By sticking exclusively to a 20-mil vapor barrier liner, which is the thickest liner available, you can be certain you’ll keep all water vapor outside your crawl space.
Remember that any dirt crawl space needs a vapor barrier. This is true whether it seems like the area has a lot of moisture in it or it seems like it is mostly dry. Even dirt that seems dry will connect much further down to dirt with a lot of moisture in it. Dirt retains moisture very far down, and any dirt crawl spaces will eventually release that moisture. It’s a good idea to put a vapor barrier liner over any dirt areas that might be in your crawl space.