Should I Shut The Vents To My Crawl House Within The Winter? This Old Home Primary Menu The filth floor that makes up the floor of your crawl house is stuffed with moisture. Builders are sometimes required to place down a polyethylene floor cowl if a crawl house is http://buildingandpestinspection17405.isblog.net/common-sense-products-for-sub-floor-vents-a-useful-a-to-z-14127097