Crawl Space Encapsulation
Moisture does not belong in enclosed spaces in a house. No place is this more apparent than in a crawlspace.
While water can invade many parts of a house--attic, walls, you name it--the crawlspace is the number one place where moisture might invade, because it has contact with the ground. In fact, it is the ground.
It's difficult to overstate the problems associated with crawlspace moisture. At the very least, you've got water under your house. No one likes that. If you try to sell your house, and the property inspector points this out (and he or she certainly will), your buyer will be so disturbed that they will want the problem fixed. Even if you lived for twenty years like this.
But the real problem is mold, fungi, and mildew. Proper ground cover and in some cases, ventilation and dehumidification are necessary to correct these issue. Moisture, if left unaddressed could lead to mold. Mold can have a negative effect on the health of a susceptible person and cause structural damage. Ventilation and dehumidification will aid in removing moisture from unwanted places.