Bugs and rodents (occasionally cats and other small animals) may enter the crawl spaceīasement foundations generally have poured in place concrete walls or masonry block walls that sit on a concrete footing.May have radon, mildew, mold, or termites and rotting wood.Moisture may accumulate or puddle in the crawl space.Floors may sag or creak due to soil movement.Other variations include where the perimeter wall is also wood post or masonry columns or where the perimeter wall is solid concrete or block and the interior portion that it surrounds is filled with dirt and a concrete slab is pour on top of the dirt.Īdvantages include the ease of adding or repairing under floor plumbing, running electrical wiring or HVAC ducting. 4×4, 6×6 etc or a concrete column or both sitting on a concrete pad) The piers (supports) may be either wood (i.e. The most common type of raised foundation is where there is a perimeter foundation wall of masonry block or poured in place concrete and interior floor supports of post and beam (pier and beam) that supports the floor of the house. The area under these types of homes is generally called the “crawl space.” The term raised foundation often has different meanings for different people but in general it refers to a foundation where the floor level is several feet or more above the surrounding earth.

Floating foundation slab mat