Slab Leak: Reroute or Repair?

A leak detection plumber first confirms there is a leak, usually with a pressure test on the hot and cold sides separately. Then they listen through the floor with acoustic equipment, scan with a thermal camera for warm spots from hot water lines and sometimes use tracer gas. The goal is to pinpoint the leak within a foot or two before any concrete is touched.

The plumber cuts through the flooring and slab at the leak, digs out the gravel, repairs the pipe and patches the concrete. It is direct and often quick, but it means breaking tile or lifting flooring, matching or replacing it afterward, and drying the opening. If the rest of the line is aging, another leak may appear somewhere else.

Instead of repairing the line under the slab, the plumber abandons it and runs a new line through the walls or attic. This avoids breaking the floor and replaces the most stressed section of pipe. It means a few small wall openings that are patched afterward. In Phoenix, attic routes must be insulated against heat. Many plumbers now prefer rerouting for hot water lines.

If the home has had more than one slab leak or still has polybutylene, a whole-house repipe may make more sense than fixing one line. It costs more up front but ends the cycle of leaks. A plumber can explain the trade-offs for your home.

Consider the age of the plumbing, how many leaks you have had, the type and value of your flooring and what your insurer will cover. A single leak in a newer home may be a good candidate for a spot repair. Repeat leaks or valuable flooring often point to a reroute or repipe.

Many policies cover water damage from a sudden slab leak and the cost to access the leak, such as breaking and patching the floor. They usually do not pay for the pipe repair itself. Some limit slab leak coverage. Read your policy and ask your agent before choosing a method, since access costs may matter.

Water from a slab leak spreads under tile, laminate and carpet and wicks into baseboards and cabinets. After the line is fixed, a restoration company maps the wet area, removes wet baseboards and pad, and dries under the flooring, sometimes by drilling small holes in grout lines to push air beneath tile. See slab leak cleanup.

Most slab leak drying takes three to six days. A slab that stayed wet for weeks, or water under large tile floors, can take longer. Readings taken daily decide when drying is done.

Warm spots on tile, the sound of running water with everything off, a meter that moves, damp carpet edges, swollen baseboards and a sudden jump in the water bill all point to a slab leak. A yearly meter test catches most of them early.

Ask how they located the leak, why they recommend a spot repair, reroute or repipe, what openings will be made and who patches them, what permits are needed and what warranty comes with the work. Check the license with the Arizona ROC license lookup.

Many slab leaks are found because of the water bill. Compare the same month from last year; a jump with no change in habits is worth a meter test.

Slab leak found? Call (602) 878-5475 for drying as soon as the line is fixed.

When a hot water line is rerouted through the attic, it must be insulated and protected. Attic temperatures in Phoenix summers can exceed 140 degrees, which is hard on any pipe. Ask the plumber how they protect attic lines and whether they recommend PEX rated for high temperatures.

Kitchen and bath cabinets sit on the slab where water spreads. Toe kicks can be removed so air reaches underneath. MDF baseboards that swelled are replaced.

Pinpoint first, choose wisely, then dry.

Call a leak detection plumber.

Ask about rerouting before any concrete is broken. It is often the faster, cleaner choice.

Find the leak precisely first, then choose between a spot repair, a reroute or a repipe based on your home's plumbing and flooring. Start drying as soon as the leak is stopped.

Questions about slab leak: reroute or repair? Call (602) 878-5475 to reach a local North Phoenix provider, 24 hours a day.