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What is a pier and beam foundation?

A pier and beam foundation raises a house on concrete or masonry piers set on footings, with wood beams across the pier tops carrying the floor joists and an open crawl space between the floor and the soil. In Texas windstorm code text the footings are concrete, the piers are concrete or grouted block, and the beams are pressure-treated wood.

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What does a pier and beam foundation look like?

In the Texas windstorm code a pier and beam foundation is built up from the ground: concrete footings, concrete or grouted-block piers standing on them, and pressure-treated wood beams framed into the pier tops. The U.S. Forest Service adds how the floor framing sits on a center girder. The Texas Department of Insurance code and the Forest Products Laboratory say: In Texas, “The footings of the foundation shall be constructed of concrete.” Source: Texas Department of Insurance, read 2026-10-30. In Texas, “The piers shall be constructed of either concrete or hollow masonry units filled with grout.” Source: Texas Department of Insurance, read 2026-10-30. In Texas, “Beams shall be framed into the top of the piers.” Source: Texas Department of Insurance, read 2026-10-30. In Texas, “The beams shall be pressure treated with a wood preservative.” Source: Texas Department of Insurance, read 2026-10-30. “The floor framing in residential structures typically consists of wood joists on 400- or 600-mm (16- or 24-in.) centers supported by the foundation walls and the center girder (Fig. 16–1).” Source: U.S. Forest Service, Forest Products Laboratory, read 2026-10-30.

What is a pier and beam foundation made of under Texas building rules?

No code text quoted on this page gives a one-line definition of the term. What the sources describe is a house raised so that an open crawl space sits between the floor and the soil, held up on piers and beams. Texas A&M AgriLife Extension names pier and beam construction, and the Texas windstorm code limits where it can be used: “If the house is of pier and beam construction, inspect the area between the floor and the soil, called the crawl space (Fig. 9).” Source: Texas A&M AgriLife Extension, read 2026-10-30. In Texas windstorm code text, “A pier and beam foundation shall not be used in areas denoted as V Zones by the National Flood Insurance Program.” Source: Texas Department of Insurance, read 2026-10-30.

How deep are pier and beam foundations?

The Texas windstorm code sets minimums: the footing pad is buried at least 12 inches below natural grade, the piers stand between 12 inches and 3 feet above grade, and they are spaced no more than 8 feet apart. These come from the code text as posted by the Texas Department of Insurance (amendments effective June 1, 2002) and are not a rule for every state: In Texas, “The bottom of each footing pad shall be buried a minimum of 12 inches below natural grade.” Source: Texas Department of Insurance, read 2026-10-30. In Texas, “The maximum height of the piers above natural grade shall be 3 feet.” Source: Texas Department of Insurance, read 2026-10-30. In Texas, “The minimum height of the piers above natural grade shall be 12 inches.” Source: Texas Department of Insurance, read 2026-10-30. In Texas, “The piers shall be spaced a maximum of 8 feet on center in all directions.” Source: Texas Department of Insurance, read 2026-10-30.

Is a pier and beam foundation considered permanent?

No source found calls a site-built pier and beam foundation permanent or temporary. The closest federal text is HUD's rule for manufactured homes, which lists piers among the systems it accepts as a permanent foundation and says what makes any foundation permanent: durable, site-built materials and attachment points that carry the loads to the soil. That rule covers manufactured homes only. HUD Handbook 4930.3 says: For manufactured homes, HUD says: “Set on permanent foundation of piers, or of continuous, cast-inplace concrete, concrete-block masonry, all-weather wood, or other approved systems.” Source: U.S. Department of Housing and Urban Development, read 2026-10-30. For manufactured homes, HUD says: “Permanent foundations must be constructed of durable materials; i.e. concrete, mortared masonry, or treated wood - and be site-built.” Source: U.S. Department of Housing and Urban Development, read 2026-10-30. For manufactured homes, HUD says: “It shall have attachment points to anchor and stabilize the manufactured home to transfer all loads, herein defined, to the underlying soil or rock.” Source: U.S. Department of Housing and Urban Development, read 2026-10-30. For manufactured homes, HUD says: “Screw-in soil anchors are not considered a permanent anchorage.” Source: U.S. Department of Housing and Urban Development, read 2026-10-30.

Is a crawl space foundation the same as pier and beam?

The sources treat them as two things: a crawl space is the open space under a raised floor, and pier and beam names the piers and beams that hold the floor up. The Forest Products Laboratory describes a crawl space over concrete block foundations that rise above ground, and Penn State notes that the model residential code does not define the word. In Texas, A&M AgriLife Extension sets clearances of 18 and 12 inches: “The International Residential Code (IRC) does not provide a definition for the term “crawlspace.”” Source: Pennsylvania Housing Research Center, Penn State, read 2026-10-29. “Another practice is to have concrete block foundations extend a short distance above ground to support a floor system over a “crawl space.”” Source: U.S. Forest Service, Forest Products Laboratory, read 2026-10-30. In Texas, “The crawl space should have a minimum 18-inch clearance between floor joists and the soil, and at least 12 inches between floor beams and the soil.” Source: Texas A&M AgriLife Extension, read 2026-10-30. In Texas windstorm code text, “If the bottom of the floor joists are located closer than 18 inches to the exposed ground, then the floor joists shall be pressure treated with a wood preservative.” Source: Texas Department of Insurance, read 2026-10-30.

Do pier and beam foundations need to be watered?

None of the sources found says a pier and beam foundation needs watering. What they say is about water near any foundation on clay: Colorado State University Extension says clay soil swells when wet and shrinks when dry, and sets sprinklers no closer than five feet and trees no closer than fifteen. The Texas windstorm code leaves soil and drainage outside its scope: In Colorado, “These soils, called bentonite, contain a clay mineral that swells when it gets wet and shrinks upon drying.” Source: Colorado State University Extension, read 2026-10-30. “Begin landscaping with a site that has been graded so water drains away from the house.” Source: Colorado State University Extension, read 2026-10-30. “Don’t allow sprinkler systems to spray any closer than five feet from the foundation, and plant trees no closer than fifteen feet from the foundation.” Source: Colorado State University Extension, read 2026-10-30. “It is important to carefully regulate water applied near the foundation.” Source: Colorado State University Extension, read 2026-10-30. In Texas, “Other design conditions, such as soil conditions and surface drainage are not within the scope of this building code and, as such, are not addressed by the prescriptive construction requirements.” Source: Texas Department of Insurance, read 2026-10-30.

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