Plumbing Notes/slab leaks
How We Find a Slab Leak Without Tearing Up Your House
Brad's crew finds a slab leak with pressure testing, acoustic gear, and thermal imaging before any concrete gets touched. Here is the order we work in and what detection costs you.
By Brad Staiger — Staiger Plumbing, LIC. #802197
We start by isolating the system
Before anyone listens to a floor or pulls out a camera, we isolate the system. We close the main, put a gauge on a hose bibb, and pressurize the supply lines to around 60 psi. Then we watch. If the needle holds, the leak is not on the pressurized side. If it drops, we know water is escaping somewhere under the slab and roughly how fast. From there we separate hot from cold by isolating the water heater, because most slab leaks we find in Riverside and Corona are on the hot line, where 40-plus years of hard Inland Empire water has thinned the copper from the inside. A fast decay on the hot side alone tells us where to point the rest of the equipment. This step costs you nothing, and it rules out half the house before we ever open a wall.
Listening for the pinhole
With the line still under pressure, we go acoustic. A ground microphone and a set of headphones let us hear water forcing its way out of a pinhole, which sounds like a steady hiss or a rush under the concrete. We work the floor in a grid and mark where the sound peaks. This is slower in older Fontana and Hemet tracts where the slab sits on expansive clay, because the soil shifts and the original pipe runs do not always match the prints. Furniture, tile, and a running AC compressor all fight the signal, so we shut the house down and listen room by room. On a quiet morning we can put a mark within a foot or two of the leak using sound alone. The pressure test told us a line is leaking. The acoustic pass tells us where on that line to concentrate.
Reading heat through the concrete
When the leak is on the hot side, heat gives it away. We run a thermal camera across the floor and look for a warm bloom where 120-degree water is heating the concrete from below. On tile and hardwood in a Norco or Chino Hills home built in the 80s, that warm patch often lines up within inches of where the acoustic mic peaked, and now we have two methods agreeing on the same spot. Thermal does not read as well on a cold-water leak, since there is no temperature difference to pick up, which is one more reason we confirm hot versus cold up front. We also walk the floor barefoot and check for warm spots the camera might miss near cabinets and closets. Two independent readings on the same square of floor is what lets us commit to opening that spot and nothing else.
Narrowing to the one run
All of this is about narrowing a leak to one run of pipe instead of guessing. By the time we are done, we are not saying the leak is somewhere in the kitchen. We are saying it is on the hot line between the heater and the kitchen sink, about three feet in off the slab. That precision is what lets us fix a slab leak without tunnel-cutting or saw-cutting the foundation, which we never do. Depending on the run, Brad either reroutes that section overhead in PEX-A or sleeves the failed line in the wall. In the older Wood Streets homes near downtown Riverside, where one pinhole usually means two more are coming on the same copper line, we will talk through whether rerouting that whole run now saves you a second repair next year. The detection is what makes that a real conversation instead of a sales pitch.
What it costs and what it means
Here is the part a lot of companies will not put in writing. The leak detection itself is free, and you get a written estimate before any repair starts. We are not charging you to find a problem we hope to fix. If the pressure test, the acoustic pass, and the thermal scan all point to the same run, the estimate reflects exactly that run and nothing speculative. Our slab leak repairs carry a lifetime warranty, and we have been doing this across Riverside and San Bernardino counties since 2001, LIC #802197. What this means for you is simple. A warm spot on the floor or a water meter that keeps creeping does not have to turn into a jackhammered living room. The right detection, done in order, points us at the one place to work, and most of your house never gets touched.
Related notes
- Signs of a Slab Leak — How to Catch It Before the Damage
A slab leak rarely shows itself right away. Here is what Inland Empire homeowners notice first, why local copper fails early, and what our crew checks on a free diagnostic call.
- Why Catching a Leak Early Saves Tens of Thousands
A pinhole we catch this week runs a couple hundred dollars. The same leak found six months later, after it has soaked the slab, is a completely different number. Here is how that math works.
- Slab leak repair — re-route in PEX-A
When copper fails under an Inland Empire slab, we don't jackhammer the floor chasing it. We abandon the bad line and run a fresh PEX-A re-route through the walls and attic.