Rodent pests love looking for dark, damp, and messy places to build their nests and raise their young. That would make a damp and musty dirt crawl space perfect for them. But with crawl space encapsulation, your crawl space can be made clean and dry. This not only deprives potential rodent pests of the moisture they want, but it also can help discourage rodents by depriving them of nesting materials that a dirt crawl space may offer.