Foundation Repair in Sherman, TX — Where Blackland Prairie Clay Meets Old-Growth Neighborhoods
Serving Sherman From Our McKinney HQ
Sherman Sits on Some of the Deepest Clay in North Texas
Sherman is about 45 minutes north of our McKinney headquarters at 1402 Custer Rd #904. We run crews into Grayson County every week because the soil up here is brutal on foundations. Sherman sits squarely on the Blackland Prairie, and the clay formations underneath the city are primarily Taylor Marl and Ozan — Upper Cretaceous deposits loaded with montmorillonite, the same mineral that makes clay swell when it gets wet and contract when it dries out. Grayson County soil reports consistently show plasticity indices above 40, which puts Sherman in the high-risk category for foundation movement.
What makes Sherman different from cities closer to Dallas is the age of the housing stock. A significant share of homes here were built between the 1940s and 1970s, long before modern slab-on-grade standards required the soil prep and post-tensioning that newer construction uses. These older slabs are thinner, less reinforced, and sitting on ground that was never properly conditioned before the pour. After 50 to 80 years of shrink-swell cycling, the damage adds up. If your doors are sticking, your brick has stair-step cracks, or your floors feel uneven, your foundation has likely moved.
We offer a free inspection with no obligation. Our crew takes elevation readings across your entire slab, checks your drainage and grading, and evaluates the soil conditions around all four sides of your home. Everything goes into a written report. If you don’t need piers, we’ll tell you — we have done over 20,000 inspections in DFW and turned away many jobs that didn’t need repair. When your home does need work, we match one of our three engineered pier systems to your soil depth and get most jobs done in a single day.
Sherman is built on the Blackland Prairie, a geological region defined by deep, dark, calcareous clay derived from the weathering of Upper Cretaceous marine formations. In Grayson County specifically, the dominant formations under most residential areas are the Taylor Marl and Ozan Formation — thick beds of montmorillonitic clay that sit above the Austin Chalk. This clay absorbs water aggressively and releases it just as fast. The volume change between wet and dry seasons can exceed 30%, and that constant pushing and pulling is what breaks slabs.
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Taylor Marl & Ozan Clay
The Taylor Marl beneath Sherman is a calcareous, montmorillonite-rich clay that ranks among the most expansive soils in North Texas. The Ozan Formation below it is similar — heavy, plastic, and reactive to moisture. Together they create a deep clay profile that keeps foundations under stress year-round. Unlike areas closer to Dallas where you hit limestone at shallow depth, Sherman’s clay goes deep before you reach stable bearing material.
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Pre-1970s Housing Stock
Many of Sherman’s established neighborhoods — from the blocks around Austin College to West Sherman and the Tribune area — were built between the 1940s and 1960s. Those foundations were poured with thinner slabs, less steel reinforcement, and minimal soil preparation compared to modern standards. After 60 to 80 years of sitting on active clay, these older slabs have absorbed decades of cumulative movement that newer homes haven’t experienced yet.
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Mature Trees & Root Moisture Draw
Sherman’s older neighborhoods are full of large post oaks, pecans, and elms. Mature trees can pull hundreds of gallons of water from the soil daily, drying out the clay unevenly around one side of a foundation. This creates differential settlement — one section of the slab drops while the rest stays put. We see this pattern constantly in Sherman, especially on lots where a big tree sits within 15 feet of the house.
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North Texas Drought-to-Deluge Cycles
Grayson County gets the same extreme weather swings as the rest of North Texas. The 2022 and 2023 pattern of extended drought followed by heavy fall rain was especially damaging. Bone-dry clay cracks deep into the ground during summer, then swells rapidly when the rain returns. That whiplash puts enormous stress on any slab, but older Sherman foundations with less reinforcement take the worst of it.
Between the deep reactive clay, the older housing stock, and the mature tree canopy, Sherman is one of the harder environments for foundations in our service area. Drainage plays a major role too. If your gutters dump water at the foundation line or your yard slopes toward the house, that accelerates damage. We check all of it during every free inspection.
Signs Your Sherman Home May Need Foundation Repair
Some of these develop slowly over years. Others can appear after a single harsh summer. If you notice two or more, it’s time for a professional evaluation.
→Diagonal cracks radiating from door or window corners through the drywall or sheetrock
→Interior doors that drag, stick, or won’t latch when they used to close smoothly
→Stair-step cracks in exterior brick, running along the mortar joints
→Floors that slope noticeably when walking from one room to another
→Gaps opening between walls and ceilings, or between window frames and the surrounding wall
→A sudden increase in your water bill, which may signal a slab leak caused by foundation movement
A single hairline crack does not always mean trouble. New concrete cracks as it cures, and that’s normal. What matters is whether your slab is actively moving. We determine that with elevation measurements across the full footprint of your home. If the issue is cosmetic, we’ll let you know and save you the money.
Foundation Repair Systems We Install in Sherman
Recent Sherman Project
West Sherman, Built 1962
A homeowner on West Lamar Street contacted us about cracks running through the brick veneer on the south side and a bathroom door that had stopped closing entirely. The house was a single-story pier-and-beam conversion to slab, built in 1962 on deep Taylor Marl clay. Our elevation survey showed 2.75 inches of settlement along the entire south perimeter, with the worst drop at the southwest corner where a large pecan tree had been pulling moisture from the soil for decades.
We installed 22 ST3 piers along the south and west perimeter walls, brought the slab back within a quarter inch of level, and finished by early afternoon. Total cost was $8,200. The homeowner called us the next morning to say every door in the house was closing properly for the first time in years.
Every Sherman home is different, and the right pier system depends on what’s happening underground. We carry three systems and your inspector will recommend the one that matches your soil depth, your home’s load, and how far the slab has already moved.
Most Affordable
ST1 System
Concrete Pressed Piers
Starts with 1 ft of steel, then all concrete. 11,980 PSI cylinders, nearly 2x stronger than the industry standard. A good fit for Sherman homes where the bearing layer is relatively shallow or where the Austin Chalk sits closer to the surface on the east side of town.
Starts with 3 ft of steel, then concrete. Punches through shallow hard layers and reaches about 50% deeper than the ST1. This is our primary recommendation for Sherman because the Taylor Marl clay runs deep and the bearing stratum is often well below the surface.
Starts with 10 ft of double-walled steel, reaching about 2x the depth of the ST1. We reserve this for severe cases in Sherman where settlement exceeds 3 inches or where the clay profile is unusually deep with no stable layer within normal pier range.
Most Sherman jobs finish in a single day. Our crew excavates at each pier location along the perimeter, drives the pier segments to refusal, and lifts the slab back toward its original position. Steel brackets lock everything in place. Every hole is backfilled and compacted before we leave. You can stay in the home the entire time.
Your free lifetime transferable warranty starts the day we finish. If you sell your house down the road, the warranty transfers to the new owner at no cost. We also offer 0% interest financing with 6, 12, or 24-month terms and no payments required.
Our Nearest Office to Sherman
Sherman is served by our McKinney headquarters at 1402 Custer Rd #904, McKinney TX 75070. Open Monday through Friday, 7:30 AM to 6:00 PM. About 45 minutes south on US-75.
Sherman Neighborhoods We Service
We work across all of Sherman and surrounding Grayson County. These are the neighborhoods and subdivisions where we see the most foundation issues.
West Sherman South Sherman North Sherman Junction Austin College Area Tribune Westwood Village Heritage Ranch Canyon Creek Estates Post Oak Crossing Pebblebrook Preston Club The Legends Timarron Woodlawn Downtown Sherman
Foundation Repair FAQs — Sherman
Most Sherman foundation repairs fall between $2,500 and $15,000. The final price depends on how many piers your home needs and how far the slab has settled. We offer 0% financing for up to 24 months with no payments.
Sherman sits on the Blackland Prairie, and the dominant soil formations are Taylor Marl and Ozan clay — both highly expansive montmorillonitic clays that swell when wet and shrink when dry. That constant volume change stresses slabs year after year. On top of that, a large portion of Sherman’s housing stock was built between the 1940s and 1970s with less reinforcement than modern codes require.
Diagonal cracks in drywall near door and window corners. Doors that stick or refuse to latch. Stair-step cracks in exterior brick along the mortar joints. Floors that slope or feel uneven when walking room to room. Gaps forming between walls and ceilings or around window frames. A sudden jump in your water bill, which can indicate a slab leak caused by foundation movement.
Yes. Every inspection is free with no obligation. We take elevation measurements across your full slab, evaluate your drainage and grading, and assess the soil conditions around your home. You receive a written report with all findings. If your foundation does not need repair, we will tell you. Our nearest office is our McKinney headquarters at 1402 Custer Rd #904.
Most repairs finish in a single day. The crew excavates at each pier location, presses the piers to refusal, and lifts the slab back toward level. Steel brackets secure everything in place. All holes are backfilled and compacted before we leave. You do not need to move out of your home.
We use three systems: the ST1 (concrete pressed piers, most affordable), the ST3 (steel and concrete hybrid, our most-installed system in Sherman), and the ST10 (deep steel piers for severe settlement or unusually deep clay). Your inspector selects the right system based on your soil conditions, your home’s weight, and the amount of movement that has occurred.