With the SilverGlo and TerraBlock in place, our team next installed the CleanSpace Crawl Space Moisture Barrier, which is the heart and soul of the CleanSpace system. This durable, 20 mil bright white crawl space liner installs on the walls and floors, preventing water vapor and humidity from passing through. The mold resistant additive "UltraFresh" ensures that CleanSpace will never support mildew or mold growth on its surface. With your crawl space encapsulated and dry, you protect your structure and insulation from mold and rot and your crawl space becomes a clean, usable storage area.