Post-Tension Cable Repair in Fort Worth, TX

Post-tension slabs use steel cables, called tendons, stressed within the concrete after it's poured, which resists cracking on expansive clay soil better than conventional rebar reinforcement alone. That's a big part of why post-tension construction became common across North Texas from the 1980s forward — builders were responding directly to the same soil conditions we deal with on every job.

Tendons fail in a few recognizable ways. Water intrusion at the anchor pockets along the slab edge corrodes the cable and anchor hardware over years, especially where exterior grading or a poorly sealed pocket lets moisture in. Cables also get cut or damaged during exterior work — a fence post dug too close to the slab edge, a deck ledger bolted through the perimeter, or a homeowner drilling into the edge of the slab without knowing a tendon runs through that section.

Repair starts with locating the cable layout, either from the home's original post-tension plan if it's available or by tracing anchor pockets and using non-invasive detection methods, since drilling or cutting blind into a stressed slab is genuinely dangerous. From there we open the affected anchor pocket, and depending on the failure, we re-stress the existing tendon, splice in a repair, or add a supplemental cable to restore the slab's intended tension — then reseal the pocket to keep water out going forward.

A broken tendon doesn't necessarily mean the whole slab is failing, and it doesn't require slab replacement in most cases. But because a stressed cable stores real energy, this isn't a DIY repair or a job for a general contractor unfamiliar with post-tension systems — locating cables and working on anchors safely takes specific experience with these slabs.

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Why North Texas Slabs Are Often Post-Tensioned

Post-tensioning resists the cracking that expansive clay soil tends to cause in conventionally reinforced slabs, which is why it's been standard on much North Texas residential and commercial construction since the 1980s. If your home was built in that era or later, there's a good chance it has a post-tension slab, usually identifiable by small anchor pockets spaced along the slab's edge.

Common Causes of Cable Failure

Corrosion at the anchor pocket from long-term water intrusion is the most common cause we see, usually tied to grading or drainage issues at the slab edge. Physical damage from landscaping, deck or fence construction, or drilling into the perimeter without checking for cable locations is the other major cause.

How We Repair a Broken Tendon

We locate the cable layout, open the affected anchor pocket, and either re-stress, splice, or supplement the damaged tendon depending on the specific failure, then reseal the pocket against future moisture intrusion. Full slab replacement is rarely necessary for an isolated tendon failure.

Signs of a Failing Post-Tension Cable

Rust staining or bleeding around an anchor pocket at the slab edge is often the first visible sign of a corroding tendon, sometimes accompanied by a cracking or spalling pattern in the concrete right around the pocket itself. A sudden loud bang, occasionally reported by homeowners, can indicate a tendon has actually snapped and released its tension abruptly, though not every tendon failure is that dramatic — some corrode and lose tension gradually with no obvious single moment. Cracking that radiates from a specific point along the slab edge, rather than the more generalized cracking pattern typical of settlement, is worth having assessed specifically for a tendon issue rather than treated as ordinary foundation cracking.

What Affects the Cost of Tendon Repair

How many tendons are affected and whether the failure is isolated to a single anchor or involves multiple points along the slab edge drives most of the cost difference. Locating cable layout, particularly on older homes without a retained post-tension plan, adds time compared to a job where the original tendon map is available. Whether the repair involves re-stressing the existing cable, splicing in a repair, or adding a supplemental tendon also affects material and labor cost, and we determine which approach applies only after opening the anchor pocket and assessing the actual damage.

Why This Isn't a General Contractor Job

A stressed tendon holds real tension energy, and working on an anchor without knowing the cable layout or handling the release properly is a genuine safety hazard, not just a quality-of-work concern. This work calls for specific experience with post-tension systems — understanding anchor hardware, safe de-stressing and re-stressing procedures, and how to splice or supplement a tendon without compromising the rest of the slab's tension. We carry the insurance and experience specific to this work, and we're upfront when a general foundation issue turns out to need a post-tension specialist versus a standard structural repair. We follow Post-Tensioning Institute (PTI) field procedures for locating, de-stressing, and re-stressing tendons, which is the same industry-standard framework structural engineers expect to see referenced in post-tension repair documentation.

Preventing Future Anchor Pocket Corrosion

Once an anchor pocket is repaired and resealed, keeping water away from that spot going forward matters as much as the repair itself, since the original failure in most cases traces back to moisture reaching the anchor over years, not a manufacturing defect in the tendon. We check grading and drainage right at the slab edge as part of every tendon repair, and where landscaping, sprinkler heads, or downspouts are directing water toward the perimeter, we flag that as part of the same visit. Periodically walking the slab edge to check for new staining or hairline cracking near other anchor pockets is a simple, low-cost habit that can catch a second tendon issue early, well before it reaches the point of a sudden failure.

Post-Tension Cable Repair FAQs

How do I know if my slab has post-tension cables?

Post-tension slabs generally have small anchor pockets — round or rectangular patches, sometimes with a warning marking — spaced along the slab's perimeter. Homes built in North Texas since the 1980s are more likely to have post-tension construction than older conventional slabs.

Is it dangerous to drill or cut into a post-tension slab?

Yes. Tendons are under significant tension, and cutting or damaging one without knowing the cable layout can cause a sudden, forceful release. Always have cable locations checked before any drilling, coring, or deep fastening near a slab edge.

Can a broken post-tension cable be fixed without replacing the whole slab?

In most cases, yes. Broken tendon anchors can typically be repaired, re-stressed, or supplemented with an added cable without replacing the surrounding slab.