Your crawl space, even though it is under your house, should still be dry. You don't want water to accumulate in your crawl space. Water contained in your crawl space can lead to the underside of your home experiencing water damage and potentially being contaminated with mold. Water damage and mold are two things you really don't want to have to deal with if you don't have to. Keeping water out of your crawlspace requires a full-scale approach.