Carrollton sits at the intersection of three counties — Dallas, Denton, and Collin — and on top of expansive Blackland Prairie clay that moves with every wet-dry cycle. Most homes here were built during the 1970s through the 1990s growth wave, which means they sit on something most homeowners have never thought about: a post-tension slab.
Until something leaks under it. Then it matters a lot.
What is a post-tension slab — and why it matters when something leaks under it
A post-tension slab is a concrete foundation reinforced with high-strength steel cables (called “tendons”) instead of standard rebar. After the slab is poured, those cables are pulled to about 33,000 pounds of tension each and locked in place, which keeps the entire slab in compression. That’s how it resists the constant push and pull of North Texas clay without cracking apart.
Here’s where it gets serious for a slab leak repair: if a plumber cuts into the slab to access a leak without scanning for tendons first, and the saw hits a cable, that cable releases. The slab cracks. Sometimes the cable whips out and damages whatever’s around it. Repair on a damaged post-tension slab requires a licensed structural engineer and a specialized re-tensioning crew. The repair bill goes from a few thousand to twenty or thirty thousand fast.
The mistake we see other plumbers make
We’ve been called in to clean up post-tension slab jobs gone wrong more times than we’d like to admit. Here’s the pattern, almost every time:
Homeowner has a slab leak. Calls a general plumber. Plumber locates the leak (good), then runs a wet saw through the slab to access the pipe without first scanning for tendons (bad). Saw catches a cable. Slab cracks. Plumber finishes the pipe repair and leaves — the cable issue isn’t visible from the surface. Months later, the homeowner notices doors sticking, a crack in the wall, or a section of the slab dropping. By then the structural damage is set.
This is not a hypothetical. Every Carrollton home built after the mid-1980s should be assumed to be on a post-tension slab until proven otherwise. The scan takes ten minutes. Skipping it to save those ten minutes is how homeowners end up with structural engineering bills.
How we handle a slab leak on a post-tension home
- Locate the leak first. Electronic line tracing, acoustic, thermal, and where needed sewer camera and hydrostatic testing — all non-invasive.
- Identify the slab type. Check the build year, inspect the slab edge for anchor heads (the tells), and scan the area with a metal detector tuned for tendons before any cutting.
- Mark the cable runs. Tendons typically run on a grid spaced every 3–5 feet. We mark them on the slab so we know where we can and cannot cut.
- Choose the repair method to avoid cutting at all if possible. On post-tension homes, rerouting through walls or attic is often the right call even when an open-slab repair would be slightly cheaper. The structural risk pays for the reroute.
- If we do cut, we cut where the scan says it’s safe. Small, targeted opening between tendons, never across them.
Three counties, one Carrollton — what that means for you
Carrollton is unusual in DFW in that it straddles three county lines. Most homeowners don’t think about it until something needs a permit, an inspection, or an insurance claim. Here’s how it actually breaks down.
Dallas County
Most of southern and eastern Carrollton, including older 1960s–80s housing near Old Downtown. Carrollton-Farmers Branch ISD.
Denton County
Northwestern Carrollton, including Castle Hills and newer 1990s–2010s master-planned subdivisions in 75007 / 75010.
Collin County
A small northeastern portion. Most homes are 2000s+ with PEX or copper supply and PVC drains.
Practical impact: permits, code inspections, and water utility billing can vary by county. We pull the right permits for the part of Carrollton you’re in.
How do I know if I have a slab leak in Carrollton?
The signs are similar in every house, but on a post-tension home, even one of them is reason to act quickly — because if there is a leak under the slab, the longer it runs, the more soil shifts under the foundation, and the more stress those tendons end up carrying.
- A warm or hot spot on the floor. Almost always a hot-water supply leak.
- A water bill that jumped with no change in usage. Pressurized leaks run 24/7.
- Sound of running water with every fixture off. Pressurized leak somewhere in the system.
- Cracking tile, damp flooring, or a soft slab patch. Substrate failing under the floor.
- Doors that suddenly stick or new wall cracks at corners. On a post-tension home, this can mean the slab is reacting to a long-running leak. Don’t ignore it.
- Persistent sewer smell. Cracked drain venting under the slab.
- Yard sinking or extra-green grass in a strip. Sewer line outside the foundation following the same failure pattern.
Repair options for a Carrollton post-tension home
The decision tree is slightly different here than on a conventional rebar slab. We bias toward repairs that don’t require cutting the slab when there’s a reasonable alternative.
| Option | Best when… | Notes for post-tension homes |
|---|---|---|
| Reroute through walls / attic | Bad pipe is reachable above the slab | Often our first recommendation — avoids slab cutting entirely, eliminates structural risk |
| Targeted spot repair | Leak is in an area we’ve scanned and confirmed clear of tendons | Acceptable when scan confirms it; we mark cables before any cut |
| Whole-home repipe | System-wide failures; older homes with multiple leak events | Best done overhead so the slab isn’t disturbed at all |
| Sewer line repair / lining | Cast iron or PVC drain failure | Trenchless lining often available; protects landscape and slab |
| “Bust open the floor to look” | Never | Not on a post-tension slab. Period. |
Think you have a slab leak? Start here.
Three steps today, in order:
- Run the meter test. Shut off every water source inside and out. Watch the meter’s leak indicator. Movement with everything off means water is escaping.
- If you see active flooding, a warm spot, or a fast-rising bill, shut off the main at the meter or house valve. Call a licensed plumber to locate it.
- Before anyone touches your slab, ask: “Have you scanned for post-tension cables?” If the answer isn’t an immediate yes, find a different plumber.
Carrollton slab leak FAQ
How do I know if my Carrollton home has a post-tension slab?
If your home was built after the mid-1980s in DFW, assume yes until proven otherwise. The easiest visual tell is the slab edge: post-tension slabs often have small anchor heads visible (or patched) every 3 to 5 feet along the perimeter. Your original builder’s records or city permit records will also state the foundation type. When in doubt, we scan before we cut.
What happens if a plumber cuts a post-tension cable during a slab leak repair?
The cable releases its stored tension, which can crack the slab, damage flooring above, and in some cases whip outward. Repairing the damage requires a licensed structural engineer to design a re-tensioning solution and a specialized crew to execute it. Costs frequently run $15,000 to $30,000 on top of the original plumbing bill. That’s why we scan for tendons before any cutting.
Why are post-tension slabs so common in Carrollton?
Post-tension construction became the standard for new DFW homes from the 1980s onward because it handles Blackland Prairie clay movement better than traditional rebar-reinforced slabs. More than 60% of Carrollton’s housing was built between 1970 and 1999, and the majority of the homes built after the mid-1980s in that window sit on post-tension foundations. It’s why every Carrollton slab leak conversation needs to start with foundation type.
Will my homeowners insurance cover a slab leak in Carrollton?
It depends on your policy. Many Texas homeowner policies cover the resulting water damage, and sometimes access to the pipe, even when they don’t cover the pipe repair itself. We document the leak, the cause, the repair method, and any cable scan results — which is exactly what your carrier needs to evaluate a claim. Always confirm coverage with your insurer.
I’m in Castle Hills / Indian Creek / Rosemeade — do you service my neighborhood?
Yes. We serve all of Carrollton across Dallas, Denton, and Collin counties — including Castle Hills, Indian Creek, Rosemeade, Country Place, Old Downtown Carrollton, the Hebron Parkway corridor, and the Trinity Mills area. Tell us your address when you call and we’ll roll the closest truck.
Do you do 24/7 emergency slab leak service in Carrollton?
Yes. Staggs Plumbing runs 24/7 emergency service across Carrollton and North Texas with a roughly 45-minute average response time. If you have active flooding or a burst line, shut off your main water valve and call (682) 284-0966.
