Find the hiss before you find the jackhammer

Hidden leaks are quiet until they are not. The bill moves. A closet smells like a cave. A hallway is warm in a house with the heater off. Paint peels at a baseboard you just painted. Those are not mysteries unique to San Antonio, but slabs and hard water make them common here.

Start with isolation, not demolition. Irrigation off. Ice maker off. House quiet. Watch the meter. Close the house valve and watch again. You now know which side of the valve is lying to you. That is the core of leak detection.

Listen at night. A hiss at a slab is easier to hear when the air conditioner is not roaring. Thermal cameras help on hot-side leaks. They lie on sun-loaded tile in August. A good tech will say so.

Condensation on a cold line in a humid hall bath is not a leak. Wipe it, wait, and recheck. The opposite error is ignoring a warm path because you assume the sun heated the foyer. Sun does not follow a pipe trench in a snake shape.

If the leak is under the slab, the next page is slab leak, not a blog comment section. Reroute versus opening the floor is a finish and tendon conversation. Post-tension slabs are not the place for enthusiasm.

Cabinets hide supply leaks at stops and angle valves. Those are the cheap wins. Replace a weeping stop before you accuse the underground. Photograph the part. After-hours memories are sloppy.

Houses near the Tobin Center corridor and older downtown stock mix copper eras. North-side PEX fails at fittings more than at sunlight. The method stays: isolate, listen, confirm, then cut.

Insurance adjusters like timelines. Meter photos with dates are more useful than a paragraph about how long you “kind of noticed.” We do not write coverage promises on this site.

Official permit paths for larger openings: Development Services. Official license lookup: TDLR. Official city home: sanantonio.gov.

Active flooding still goes to emergency plumber. Detection is a poor hobby while a ceiling is coming down.

Ice-maker valves and refrigerator lines are the cheap finds. Look there before you accuse the underground. Photograph the part. A $12 valve that weeps for a month can look like a slab on a bill if you never isolate.

Irrigation clocks that run at 4 a.m. confuse everyone. Isolate the irrigation separately. A “plumbing leak” that dies when you shut the sprinkler controller is a landscape problem. Thank that test. It is not a wasted visit. It is a saved floor.

If you already opened a wall, tell us what you saw. Dry insulation and a damp face tell different stories. We would rather continue your opening than start a second one two studs over because nobody mentioned the first.

A thermal camera in August on west-facing tile will lie. A meter will not. Use the tool that matches the weather. Night listening is still the cheapest instrument in the house.

Unexplained high bills that started after a landscaping project are often irrigation. Unexplained high bills that started after a remodel are often a new valve or a missed crimp. Write what changed. Detection is faster when it is not a mystery novel.

Hidden leaks stay cheap only while they are hidden from finishes, not from the meter. The meter already knows. Your job is to isolate which side of the house valve is lying, then stop guessing which tile to break.

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