Alexandria, LA Foundation Guide: Red River Soils & Repair

Updated October 25, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Surface geology	Red River natural levee, point bar and backswamp deposits, with older Pleistocene terraces	Louisiana Geological Survey
River clay	Latanier: smectitic clay over loam, type location 1.4 mi SE of Chambers in Rapides Parish; cracks when dry	USDA NRCS soil series
Red clay	Moreland: very-fine smectitic clay from Permian red bed sediment on Red River floodplains	USDA NRCS soil series
Terrace soil	Kolin: loamy over clayey, wet above the clay December to April; described in Rapides Parish	USDA NRCS soil series
Climate	About 60.9 in. of precipitation a year; July average high 91.7°F	NOAA 1991–2020 normals (via Wikipedia)
State registration	Home Improvement Registration for existing-home work over $7,500 and up to $75,000; residential license above $75,000	LSLBC
Alexandria permits	Construction Development Dept., Planning Division, 625 Murray St.	City of Alexandria
Before digging	Notify Louisiana 811 at least 48 hours ahead, not counting weekends and holidays	La. R.S. 40:1749.13

What did the Red River leave under Alexandria?

Layers of sand, silt and clay. The Louisiana Geological Survey's geologic map of the Alexandria quadrangle shows Holocene Red River deposits: natural levees flanking the river's meander belts, point bar deposits under the meander belts, and fine-grained backswamp deposits filling the flood basins between them. The same map shows older Pleistocene units of the Red River valley, including Prairie, Montgomery and Bentley deposits, and the Miocene Fleming Group, described as poorly sorted sediment that around Alexandria is mostly grayish, muddy fine sand.

USDA soil descriptions show what that means at foundation depth. Latanier, described from a site about 1.4 miles southeast of Chambers in Rapides Parish, forms on Red River natural levees as clay over loam. It's smectitic, carries slickensides, and its upper layers crack during dry periods. Moreland is a very-fine smectitic clay on Red River floodplains, formed in clayey sediment that came from Permian red beds, the source of its dark reddish brown color. On the terraces, Kolin, described north of Kolin on LA 107 in Rapides Parish, has a loamy layer over clay, and it stays wet above that clay from December through April in normal years.

Why does that clay move houses?

Smectite is a clay mineral that takes water into its structure and expands, then contracts as it dries. Soils dominated by it are classed as Vertisols. In dry weather they split into deep, wide cracks that seal up again after rain, and soil scientists note that this behavior causes serious engineering problems for structures built on them.

Central Louisiana's climate gives that clay plenty to react to. NOAA's 1991 to 2020 normals put Alexandria at about 60.9 inches of precipitation a year, with a July mean high of 91.7°F. Winter rain swells the soil and late-summer heat dries it back down. One wall catches the gutter outlet, another bakes in the afternoon, a third shares the yard with an oak, so the ground beneath a single house can be at three different moisture levels at once.

Which kind of movement is my house showing?

Three patterns cover most cases, and each calls for a different response.

Downward settlement: a corner or wall has sunk because the soil beneath it shrank, was loose fill to begin with, or eroded. This is the case piers and added supports are built for.
Upward heave: a section, often the center of a slab, has risen because the clay under it took on water, frequently from a leaking supply or drain line. The leak is the repair; piers would only lock in the unevenness.
Seasonal swing: the whole house moves a little down in dry months and back up in wet ones. Steadier soil moisture is the main tool here.

Readings taken once can't always separate these. A second set taken months later, in a wetter or drier season, often settles the question.

How do slab and raised repairs differ?

On a slab, the work happens at the edge: crews dig beside the grade beam where it has dropped, drive pressed concrete, steel or helical piers beneath it, and raise that section back toward level. The piering page compares those systems. On a raised or pier-and-beam home, the work happens underneath: low beams are jacked up, shim stacks rebuilt, weak piers replaced or added, and rotted sills or beams swapped out. Because those supports can be reset, a raised house can be fine-tuned again later. The leveling page has details. Neither repair lasts long if roof and yard water keep soaking one side of the house.

Does Louisiana license foundation contractors?

The Louisiana State Licensing Board for Contractors (LSLBC) sets thresholds by project value. A Home Improvement Registration is required for home improvement projects on existing residential structures valued over $7,500 and up to $75,000. A residential license is required for residential construction over $75,000, including labor and materials, and for home improvement projects over $75,000. The Governor's office recommends confirming a contractor's standing with the LSLBC and putting the job in a written contract before any work begins. File the contract and all receipts together.

Who issues permits?

Inside Alexandria, the city's Construction Development Department, Planning Division, at 625 Murray Street reviews and issues permits for work on existing homes. Its checklist calls for a building permit application, drawings and a stormwater pollution prevention plan for any amount of soil disturbance, plus a geotechnical soil report for additions; plumbing and electrical work must be done by city-registered contractors, and fees can be paid online. Pineville's city directory refers residents to Rapides Parish for construction permitting. Other towns, such as Ball and Woodworth, start with town hall.

Any pier holes or drain trenches count as excavation under Louisiana's Dig Law, which requires a Louisiana 811 notice at least 48 hours before digging starts, with weekends and holidays not counted. The contractor doing the digging is responsible for it.

What should two bids have in common before I compare them?

Bids are only comparable when each one gives you the same basic information. Ask every contractor for:

Their floor readings, and their explanation of the cause in a sentence or two
A plan view showing each pier or support, with the system named
On raised homes, how replacement framing is handled if hidden rot turns up mid-job
A promise of a pier log at the end, listing depth and pressure or torque
Any gutter, grading or drain work they consider necessary
Their LSLBC registration or license number, and who is getting the permit
The warranty in writing: term, what's excluded, adjustment visits, and transfer on sale

When the numbers or the diagnoses are far apart, paying an engineer for an independent look is often cheaper than picking wrong. LAPELS, the state engineering board, lists licensees.

What helps between repairs?

Clean gutters before the winter rains, and extend every downspout away from the brick
Rake soil and mulch so water runs off, not toward the walls
On a raised home, keep vents unblocked and check under the floor after big storms
Look into any water bill that jumps for no obvious reason
Photograph your worst crack on the same date each season

Common questions

What makes Alexandria soil hard on foundations?

A lot of it is Red River sediment with smectitic clay, which swells when it takes on water and shrinks and cracks as it dries. With roughly 61 inches of precipitation in a normal year and hot summers, that swing never really stops.

What state credential should a foundation contractor have?

For an existing home, the LSLBC requires a Home Improvement Registration when the job is valued over $7,500 and up to $75,000, and a residential license once it tops $75,000. You can search contractors on the board's website.

Who handles foundation permits around Alexandria?

Ask the office that covers your address: the City of Alexandria's Construction Development Department, your town hall, or Rapides Parish. Pineville refers residents to the parish for construction permits.

Alexandria, Louisiana foundation repair guide (2026)