How it unfolded

Week 1
A family member notices the hallway tile feels warm under bare feet near the bathroom.
Week 2
The water heater seems to run more often, and the next water bill is higher than usual.
Week 2, weekend
The owner does a meter test. The meter moves with everything off and stops when the water heater's cold inlet is closed.
Week 3
A plumber performs leak detection and marks the leak location in the hallway.
Week 3
The owner receives a written explanation of two options and chooses one.
Week 4
The repair is completed and the system is tested.

The diagnosis

  1. Pressure test

    The hot and cold sides are isolated. The cold side holds pressure; the hot side drops.

  2. Thermal imaging

    A warm band shows across the hallway floor, following the likely path of the hot line.

  3. Acoustic listening

    The loudest sound is centered under a tile near the bathroom door.

  4. Line review

    The plumber notes that the copper is original and asks whether there have been other leaks. There have not.

The two options presented

Spot repair

  • Cut tile and concrete at the marked spot.
  • Replace a short section of copper.
  • Patch concrete; tile replacement needed.
  • Rest of the original hot line stays in service.

Reroute hot line

  • Abandon the hot line under the slab.
  • Run new line through the attic and down walls.
  • Several small drywall openings to patch.
  • Permit required; check with the City of La Palma.

Why the owner chose the reroute

The hallway tile was original and discontinued, so cutting it meant replacing a large area to match. The plumber also explained that once one spot on an old hot line fails, others along the same run may follow. Routing a new line overhead avoided the tile problem and took the slab out of the picture for that line.

In a different home, with carpet in the hallway and newer pipe, a spot repair could easily have been the better choice. The decision depends on the house.

Takeaways

  • A warm floor plus a moving meter is a strong clue; test before you call.
  • Ask how the leak was located and how confident the plumber is.
  • Weigh flooring replacement when comparing spot repair and reroute.
  • Call your insurer early and keep photos of each stage.

Common questions

Did this really happen?

No. It is an invented example that reflects a common pattern, not a real job.

Is a reroute always better?

No. A spot repair can be the right answer when the pipe is otherwise sound and the floor is easy to restore.

What happens to the old pipe?

In a reroute it is usually disconnected and capped, then left in place under the slab.

General information for La Palma, not a quote or professional advice. In an emergency, call 911.