A crawlspace is a narrow area between the ground and the first floor of a home. It is typically unfinished, with a dirt floor. In some cases, it can be as narrow as 2-ft. x 2-ft., just enough room to crawl around inside — hence the name.  Manufactured home crawl spaces buffer the house, its inhabitants, and the damp, wet earth below. A crawl space is similar to a basement. It is vented to outside air and is primarily used to promote air circulation throughout the home and allow easy access to plumbing and electrical systems. A house built over a crawl space sucks up water vapor from the earth and keeps it from entering the home.