Same-Day Service7 Days a WeekFree Estimate
Plumbers of North Carolina
Plumbers of North Carolina
Plumbing · North Carolina
Call

Slab Leak

Water under a slab has nowhere to go but sideways into the soil and up through the concrete, so close the main and get it located before the flooring and the base of the walls take it on.

Tap to Call(855) 321-3426

When this becomes an emergency

What a pro does

Locating comes first, and it is most of the work. The plumber isolates the hot side from the cold to see which system is losing water, since a warm spot on the floor is a strong hint but not proof, then uses listening equipment and pressure testing to put the leak inside a small area rather than a room. Slab construction spread through North Carolina suburbs from the 1970s onward, and around Charlotte, Concord and Cary there are whole subdivisions with copper supply run in or under the concrete. Piedmont soil complicates it. Red clay swells when it takes on water and shrinks back in a dry summer, and that seasonal movement works on a pipe that is fixed at both ends until a joint or a bend gives up, and it doesn't take much. Once the spot is known, the choice is between opening the concrete at that point and abandoning the buried run entirely by rerouting the line overhead through the attic or a wall. If the pipe has already leaked once from age rather than damage, rerouting is often the repair that does not repeat.

Frequently asked questions

Hot water moves the pipe more. Every draw expands the copper and it contracts again as it cools, and a line held in concrete cannot relieve that movement, so it wears where it rubs. Heat also speeds up whatever corrosion the water chemistry is already causing, which is why the hot run tends to fail first.
It contributes. Piedmont clay changes volume with moisture, and a slab that lifts slightly in a wet spring and settles in a dry August drags on anything rigid crossing it. That is rarely the sole cause, but it is often what turns a thinning section of copper into an actual leak.
It depends on the house and the age of the pipe. A single mechanical failure in an otherwise sound system can be worth a targeted opening in the concrete. Where the copper has thinned generally, opening the floor again in two years is the likely outcome, and an overhead reroute takes the buried section out of service for good.
Policies differ a great deal on this, and some address the resulting damage differently from the cost of accessing the pipe. Call your insurance provider early and ask specifically about both, and keep the locating report and photographs from before the floor is opened.

Slab Leak?

Get connected with a local pro now.

Tap to Call(855) 321-3426

Keep going

Plumbing in North CarolinaBurst PipeClogged DrainDrain CleaningEmergency PlumberNo Hot WaterOverflowing ToiletPlumber Near MeSewer Line RepairSump Pump RepairWater Heater RepairWater Leak Repair

disclaimer: Plumbers of North Carolina is a free service to assist homeowners in connecting with local service providers. All contractors/providers are independent and Plumbers of North Carolina does not warrant or guarantee any work performed. It is the responsibility of the homeowner to verify that the hired contractor furnishes the necessary license and insurance required for the work being performed. All persons depicted in a photo or video are actors or models and not contractors listed on Plumbers of North Carolina.

Same-day and 24/7 emergency services are subject to provider participation, location, technician availability, and demand. Availability is not guaranteed and may vary by market and appointment capacity.

We use cookies and session-based analytics, including session replays (with form inputs masked), to improve this site. See our Privacy Policy.

About · Contact · Privacy · Terms · Disclosure · Sitemap

© 2026 Plumbers of North Carolina. All rights reserved.