Why water matters more than anything else
Expansive clay changes volume with its moisture: a Texas licensing bulletin says heave when wet, settle when dry. Where the soil under one part of a house is much wetter or drier than under another, the foundation bends. The same bulletin names the defenses: drainage, plants, sprinkling, maintenance.
Fort Worth’s weather makes the swings large. The National Weather Service says annual rain at DFW Airport ranges from less than 20 to more than 50 inches, and dry summers alternate with wet springs and autumns. A roof sheds a lot of that water in a short time, and where it lands decides which side of the house gets soaked.
Drainage also protects the repair itself. The Foundation Performance Association warns that improper drainage can cause continued movement of a slab that has already been piered.
The fixes, cheapest first
| Fix | What it does | Typical scale |
|---|---|---|
| Clean gutters and extend downspouts | Moves roof water away from the slab edge instead of dumping it in one spot | A weekend job or a small invoice |
| Regrade beds and soil | Makes the ground fall away from the house, not toward it | Hours to a day |
| Pull back mulch and edging | Stops beds from trapping water against the brick ledge | Hours |
| Surface drains and solid pipe | Carries downspout and yard water to the street or a low area | A drainage system: $2,800–$6,500 (Angi) |
| French drain | A perforated pipe in gravel that intercepts water underground | One side of a house: $1,200–$4,500 (HomeGuide) |
| Root barrier | Limits how far tree roots reach under the house | Priced by length and depth |
Start at the top of the list. A good contractor’s inspection includes where your water goes, and a plan that recommends piers without looking at gutters and grading is missing half the picture.
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Get the grading right
The ground next to a foundation should fall away from it. The Texas ASCE guidelines recommend, where practicable, a minimum slope of 5 percent (6 inches in 10 feet) for the first 10 feet, all around the house. Swales, the shallow channels that carry water between houses, should also keep it moving rather than holding it.
On older Fort Worth lots, the grade often drifts the wrong way over time: beds built up with soil and mulch, patios poured level with the brick, fences that block a swale. Walk the house in a heavy rain. Wherever water stands within a few steps of the wall, the grade needs work.
ASCE also distinguishes two kinds of drain. Solid pipe carries surface water and downspouts; perforated pipe in a gravel trench handles water moving underground, and its guidelines say downspouts and surface drains should not be connected to that perforated system. Ask any drainage contractor which kind they’re proposing and where it empties.
Trees, beds and flatwork
Trees. A big tree pulls a great deal of water from the soil in summer. If it’s close to the house, the clay on that side can dry and shrink far more than elsewhere. Removing the tree isn’t automatically the answer, because the soil then rewets and swells. A root barrier, or deliberate watering on that side during droughts, is often the gentler fix.
Beds. Flower beds along the foundation get watered more than the rest of the yard. That’s fine if it’s even all the way around; it’s a problem if one side is soaked and the other baked.
Flatwork. Driveways and patios that slope toward the house send water to the slab edge. Cracked or sunken flatwork can sometimes be lifted; see house leveling for the methods.
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Pier and beam houses
On a raised-floor house, drainage problems show up under the house. The FPA notes that ponding water can let the supports move, settle, or tilt. If the crawl space stays muddy after rain, fixing the grade and gutters comes before any re-shimming. The pier and beam page covers crawl space ventilation and clearance.
Watering in dry spells
In a long drought, the opposite problem takes over: the clay along the edge of the slab dries out and shrinks. Fort Worth’s year-round rules let you water by hand-held hose any time and say drip irrigation is allowed to protect foundations, while sprinklers are held to twice a week. The aim is steady moisture, not mud. The watering guide covers schedules, soaker hoses and how much is too much.
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Drainage and the repair plan
If you’re getting a foundation repaired, ask each contractor:
- What’s causing the movement, and does the plan address the water?
- Which drainage work is in the price, and which is recommended separately?
- Where will downspouts and drains discharge?
- Will the repair disturb beds, flatwork or sprinkler lines, and who restores them?
A pier plan with no drainage advice is a reason to get a second opinion.