TSBPE #M-43891
Slab Leak Detection & Repair in Austin — Find It Without Breaking Your Floor
Austin sits on expansive clay subsoil and a slab-on-grade foundation is the standard build. A copper supply line buried in or under that slab moves with seasonal soil expansion until a pinhole or a friction wear-through opens up. Hot-water slab leaks are most common (CPVC and copper expand more on the hot side, friction-wear faster), but cold-side leaks happen too. Austin Plumbing Pros locates slab leaks with non-destructive diagnostics and offers three repair paths, including attic re-routes that avoid breaking the slab entirely.
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The friction-wear failure mode in 1985-2005 Austin slab homes is famous in the trade for being predictable: builders ran soft copper through the slab pour, the line touched aggregate or rebar, and 15-25 years of thermal cycling on the hot side wore a pinhole. The leaks almost always appear under hallways or kitchens (long unbroken slab spans), and the hot side fails 4x more often than the cold. If we run the FLIR and see one hot spot, we test the entire hot-side loop before quoting — there’s typically a second weakness already developing.
How Slab Leaks Happen In Central Texas
Three failure modes drive virtually every Austin slab leak. Friction wear: a copper line laid directly against rebar or aggregate inside the slab pour. Thermal expansion (hot lines mostly) cycles the line against the abrasive surface and wears a pinhole over 15-30 years. Most common cause in homes built 1985-2005. Electrolysis: direct copper-to-rebar contact creates a galvanic cell when moisture is present. Pits the copper from the outside in. Common in 1970s-1980s pours where the plumber didn’t sleeve the copper through the slab. Soil movement: Austin’s clay shrinks in summer and expands after winter rains. A slab can move 1-3 inches across a year. A copper line tied between two fixed points and the slab can fatigue-crack at the fitting. Worst in homes near the Balcones fault and over old creek beds (Crestview, parts of South Austin).
The Symptoms — In The Order They Usually Appear
1) Water bill jumps with no usage change. 2) A warm spot on the floor (hot-water leak). 3) The sound of water running with everything off. 4) A hairline crack in the slab or tile that wasn’t there before. 5) Mildew smell along a wall. 6) Visible water at the slab-wall joint. By the time you see number 6, the framing is wet and you have a $4,000+ flooring and drywall job ahead. Symptom 1 + symptom 3 together is enough to call us same day.
The Detection Process — $389 All-In
Pressure isolation on each loop (hot, cold, irrigation, hose bib). Acoustic listening with Fisher XLT-30 on the slab in a quiet house. Thermal imaging with a FLIR E96 — hot leaks show up beautifully. If acoustic + thermal don’t pinpoint, we pressurize the loop with nitrogen and use a hydrogen tracer-gas sniffer over slab cracks and expansion joints. The diagnostic locates to within 6-12 inches. We chalk-mark the spot and quote three repair options.
Repair Option 1 — Spot Repair Through The Slab
Jackhammer a 2×3-foot section of slab over the leak, dig down 6-12 inches, expose and repair the copper line, re-pour concrete, restore flooring above. $1,400-$2,400 depending on flooring type. Right answer if the leak is in a utility room, garage, or under tile that’s easy to match.
Repair Option 2 — Attic Re-Route
Abandon the leaking section in the slab, run new PEX-A through the attic from the water heater to the fixture, drop down to the fixture inside the wall. $850-$1,650 per fixture. Best answer for most kitchen, bath, and master shower leaks. No slab break. Drywall opens at the wall drop are the only impact.
Repair Option 3 — Whole-House Repipe
Recommended when you’ve had two or more slab leaks (the third is on the way). Abandon all in-slab copper, run PEX-A through the attic to every fixture. Permanent fix. $7,200-$11,800 typical. Insurance carriers in Texas often require a full repipe after a third claim.
Transparent Austin Plumbing Pricing
Service calls from $79 daytime · $189 after-hours (waived if you authorize the repair) · Free written quote on jobs over $500
Five Promises We Keep On Every Austin Job
Written estimate before we cut
Every Austin job gets a flat-rate quote texted to your phone before any drywall or pipe is touched. No surprise invoices, no nibble-charges. 📞 (512) 555-PLBR
Master plumber on every truck
TSBPE M-43891. The lead tech who arrives at your house is a Master or Journeyman, never apprentice-only. Verify any Austin plumber’s license at tsbpe.texas.gov. 📞 Verify license
Two-year parts-and-labor warranty
Repair fails inside 24 months? We come back free, parts and labor. That’s twice the typical Austin trade warranty and we mean it. 📞 Warranty claim
Every permit, pulled and closed
City of Austin, Travis County, Williamson County, Round Rock, Pflugerville, Cedar Park, Leander, Georgetown — we know every jurisdiction and pull every permit. 📞 Same-day permit
Honest repair-vs-replace math
If the cheaper fix is the right answer, we tell you. We don’t run mandatory membership clubs. We don’t manufacture urgency to upsell a whole-house repipe when a $145 cartridge swap is what you need. 📞 Get a quote
Frequently Asked Questions
Can you find the slab leak without breaking the floor?
Yes — acoustic + thermal + tracer-gas locates to within 12 inches before any concrete is cut. 70% of the time we recommend an attic re-route that avoids the slab break entirely.
Will homeowners insurance pay for slab leak repair?
Texas HO-3 typically covers the resulting water damage but excludes the line repair itself. Some policies have a Limited Water Damage endorsement that includes detection. Our written report separates line-items so the adjuster can process correctly.
How fast can you get to a suspected slab leak?
Same-day or next-day on diagnostic. If we confirm a leak, the repair is scheduled within 48 hours for non-emergency severity.
How much is a slab leak repair total?
Detection $389 + repair $850-$2,400 depending on path. Most clients land at $1,700-$2,400 all-in for an attic re-route.
If I’ve had one slab leak, will I have another?
Higher probability than a home that’s never had one. Same vintage and same construction quality applies to every line. We track which homes call us back for a second leak — about 22% within 5 years.
What about the wet sub-slab — does that need drying?
Yes — we recommend a 3-5 day dry-out with industrial dehumidifiers (rental $75/day) to prevent mold growth. We can arrange or refer.
Are slab leaks dangerous?
Long-running leaks can cause foundation heave and structural issues. Acute leaks are not dangerous but get expensive fast in finishes and framing damage.
More Austin Plumbing Services
Emergency Plumber Austin · Drain Cleaning · Water Heater Repair · Leak Detection
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About Austin Plumbing Pros
Austin Plumbing Pros is the city’s premium master-licensed plumbing operation, run out of three depots — South Slaughter Lane, Anderson Mill, and East Riverside — so a TSBPE-licensed plumber is on-site for most calls within 35-60 minutes of dispatch anywhere inside the 130 loop. Every emergency truck carries a Master or Journeyman as the lead tech (never apprentice-only), the standard inventory truck stocks Rheem, A.O. Smith, and Bradford White water heaters plus Moen, Delta, and Kohler cartridges and aerators, and we pull permits with the City of Austin, Travis County, Williamson County, Round Rock, Pflugerville, Cedar Park, Leander, Georgetown, and Manor jurisdictions every business day. We’ve spent enough hours pulling cast iron out of pre-1980 Hyde Park backyards and chasing slab leaks under 1990s North Austin builds that we know which symptom is the easy fix and which is buying time. When you call, a real Austin dispatcher picks up. When the truck arrives, the Master plumber writes you a flat-rate estimate before any drywall or pipe is touched. When the job’s done, you get a two-year parts-and-labor warranty. That’s the entire operation in three sentences.
📞 Same-day service in any Austin ZIP — (512) 555-PLBR · Master licensed TSBPE #M-43891 · TRRC #LP-2089 · $2M general liability · Two-year warranty · Free written quote on any job over $500.