Rerouting a Slab Leak Line Through Walls or the Attic

What rerouting means

Instead of digging down to the leak, the plumber disconnects the failed line at both ends and caps it. The old pipe stays where it is, under the slab, carrying no water. A new line is then run from the supply to the same fixtures, usually through the attic and down inside walls, or sometimes along an exterior wall.

In single-story Yorba Linda homes with an accessible attic, that overhead route is often practical. Two-story homes, vaulted ceilings or finished spaces can make the route more complex, which is why each reroute is planned house by house.

How a reroute usually proceeds

Confirm the failed line.Pressure testing identifies which line is leaking and which fixtures it serves.
Plan the new route.The plumber checks the attic, walls and fixture locations to find the shortest practical path.
Make access openings.Small openings are cut in drywall where the new pipe drops to fixtures or connects to the supply.
Run and connect new pipe.New pipe is installed, supported and connected, and the old line is capped off at each end.
Test.The new line is pressure-tested, and the meter is checked with fixtures off to confirm the leak is gone.
Close up.Openings are patched, either by the plumber or a separate drywall contractor, depending on the agreed scope.

What to expect

Concrete: Usually not cut
Openings: Drywall at connection points and along the route
Old pipe: Capped and left in place under the slab
Water off: During connection work; ask how long
Restoration: Drywall patch and paint may be separate from plumbing

Confirm before the reroute starts

Exactly which fixtures will be on the new line.
A sketch or description of the route, including every wall or ceiling opening.
The pipe material and how it will be supported and insulated.
Who patches and paints the openings, and whether texture matching is included.
Whether a permit is needed. Check with the City of Yorba Linda.
How the old line will be capped and where those caps are.

Example: a hot line under a kitchen floor

Illustrative example. Not a real job or customer.

Leak location puts a hot line leak under large-format kitchen tile that would be hard to match if cut.

The plumber confirms the hot line to the kitchen and a nearby bathroom is the one losing pressure.
A route is planned through the attic, dropping down an interior wall near each fixture.
The old hot line is capped at the water heater and at the fixtures.
New pipe is run, tested and the meter is checked with everything off.

The tile stays intact. The homeowner arranges drywall patching for three openings. This is an illustrative example, not a real job.

Common questions

Is it safe to leave the old pipe under the slab?

Once capped and disconnected, the old pipe carries no water. Leaving it in place is standard practice for reroutes.

Will hot water take longer to reach the tap?

It can, depending on the new route's length. Ask the plumber how the route compares to the original and what can be done about it.

Can only part of a line be rerouted?

Sometimes a section can be bypassed. Your plumber can explain what is practical for your layout.

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