text:  When the house was built 15 years ago, they put down some probably 4 or 6 mil sheeting, but it wasn't completely encapsulated. So what I have done in the last two weeks is gotten some 15 mil poly, and I have totally encapsulated under the house. I've wrapped the pillars, I've sealed the walls, and I've taped the seams. So that's great. So something else that you can do is you could add an exhaust fan into that crawl space and have it set to work off a humidistat.