Some of the most expansive clay in Texas runs right under the Metroplex. Hot, dry summers and hard freezes make it shrink, swell, and shift. Here is what DFW homeowners should know.
Much of Dallas and the cities east and north of it sit on dark Blackland Prairie clay and weathered shale, which can swell a great deal when wet and crack open when dry. Fort Worth is more mixed. Parts of the west side are on shallower soil over limestone, while much of the east side and the cities between the two downtowns are on deeper clay. A house that straddles both, or sits on a cut-and-fill lot, can move unevenly.
North Texas weather pushes the soil hard: long triple-digit stretches in summer, sudden heavy storms, and occasional deep freezes in winter.
Newer neighborhoods across Collin, Denton, and Tarrant counties are mostly slab-on-grade, often post-tensioned. Pre-war neighborhoods closer to downtown Dallas and downtown Fort Worth include many pier and beam homes that need crawlspace work rather than slab piers. See slab vs. pier and beam.
Elevation readings and a written explanation of what the house is doing.
Pier-based repair for slab-on-grade homes, including post-tension slabs.
Shimming, pier and beam replacement, and crawlspace moisture fixes.
Lifting low areas back toward level where the structure allows it.
Grading, gutters, and drainage that keep soil moisture more even.
What changes the scope of a repair. Every quote follows an inspection.
Blackland clay, older pier and beam neighborhoods, and decades of seasonal movement.
A mix of clay and shallow limestone that can move a house unevenly.
Mid-century and newer slab homes between the two downtowns.
Established slab neighborhoods on expansive Collin County clay.
Newer post-tension slabs and settling on recently developed land.
Also serving: Irving, Garland, Mesquite, Grand Prairie, Richardson, Carrollton, McKinney, Allen, Denton, Lewisville, Flower Mound, Grapevine, Mansfield, North Richland Hills, and Keller.
Much of the area sits on highly expansive clay. When it dries in summer it shrinks and pulls away from the slab, and when it rains it swells back. That repeated, uneven movement is what cracks walls and shifts doors.
Freezing itself is less common as a cause in North Texas, but a freeze can burst plumbing lines, and a leak under or beside the slab can soften the soil and lead to movement. Watch for new cracks after a freeze-related leak.
Yes. Post-tension slabs have steel tendons cast inside them, so any repair has to avoid cutting or damaging those tendons. Tell us if your home has a post-tension slab. Many newer DFW homes have a stamped notice in the garage.
For large repairs, home sales, or insurance questions, an independent engineer's report can be worth it. Read foundation inspection vs. structural engineer.
Use the inspection request form or call (346) 679-7687.
Request an inspection from Foundation First TX and get clear next steps.
