Crawlspace Vents Do You Have To Vent Your Crawl Area? The dirt ground that makes up the floor of your crawl area is stuffed with moisture. Builders are typically required to place down a polyethylene ground cover if a crawl area is put in. This methodology doesn’t stop moisture http://demolition-contractor83700.designertoblog.com/26099164/valuable-sub-floor-ventilation-fan-plans-some-ideas