Crawlspace

A low space below the first floor of a house, less deep than a basement, typically with low masonry perimeter walls with interior piers supporting a wood floor. Often used to access pipes, ducts, and utilities. With this type of foundation, the lowest floor of a home is suspended above the ground on continuous foundation walls. Crawlspace foundations are prone to failure caused by erosion or scour because they are usually supported by shallow footings. Note, buildings on slab foundations do not have crawlspaces.