Slab Leak Detection & Repair

A slab leak is any break in a water line that runs beneath or within the concrete foundation of your home. In Smyrna and the surrounding Cobb County area, slab leaks show up in two different housing contexts. Older homes in Belmont Hills, Smyrna Heights, and the Walker Park neighborhood sit on crawlspace or basement foundations with concrete perimeter footings, where supply lines sometimes pass through or under grade-level concrete. More common are the ranch and split-level homes from the 1960s through the 1990s in Highland Park Smyrna, Argyle, and Reed Mill, where copper supply lines run beneath a concrete slab floor and have had five or six decades to corrode.

Smyrna's water chemistry shapes what causes those leaks. The City of Smyrna draws from the Cobb County-Marietta Water Authority, which pulls surface water from the Chattahoochee River and Lake Allatoona rather than limestone groundwater aquifers. That gives Smyrna water a hardness of around 38 milligrams per liter, making it the softest supply in our network. Soft surface water does not deposit the mineral scale that attacks pipes in hard-water cities, but at the wrong pH and alkalinity it can turn mildly corrosive to copper over time. The result is pinhole failures that develop slowly in the 1960s-to-1990s copper under those slabs, sometimes running for months before a homeowner notices.

If you want to understand how pinhole corrosion progresses in Smyrna copper plumbing, that service page covers the chemistry and the detection sequence in detail.

Signs of a Slab Leak in a Smyrna Home

Slab leaks rarely announce themselves dramatically. The warning signs in a Cobb County home typically build over weeks:

• A warm or hot patch on a tile or hardwood floor, especially in a hallway or near a bathroom: a hot-water line running beneath the slab is losing heat into the concrete
• The sound of running water when every fixture in the house is off
• A water bill that climbs without any change in household habits. The City of Smyrna Water and Sewer Division bills monthly, so a single high cycle warrants investigation
• Damp or discolored carpet or hardwood buckled near a wall
• Cracks appearing in interior walls or floor tiles, sometimes from the water softening the subgrade soil beneath the slab

How We Detect Slab Leaks Without Tearing Up the Floor

The standard approach, jackhammering through concrete to look for a wet pipe, treats the symptom, not the location. We locate the leak first, then open only what we need to reach it.

Our detection sequence for a Smyrna slab leak starts with a pressure test. We isolate the hot and cold supply lines and monitor pressure loss over a timed interval. That tells us which line is compromised and how significant the loss rate is. From there we move to acoustic listening equipment: ground microphones and listening discs placed directly on the concrete surface that pick up the sound of pressurized water escaping through a fracture. On a hot-water leak, we add thermal imaging, which maps the temperature difference between the leaking water and the surrounding slab to within a few inches.

The combination narrows the leak to a precise location before any concrete is disturbed. Most Smyrna homeowners are surprised at how small the actual access point ends up being. In some cases we can perform a trenchless epoxy liner repair from a single small opening rather than excavating the full pipe run.

Slab Leak Repair Options in Cobb County

Once we have the leak location, the repair path depends on the pipe material, the depth of the line, and how much of the run is affected. For a Smyrna home built in the 1970s with copper supply under the slab, the common scenarios are:

• Spot repair: A single pinhole or joint failure with otherwise sound pipe. We open the concrete at that point only, cut and reroute or patch the line, and close up.
• Section reroute: A longer run with multiple failure points or significant corrosion. We reroute that section through the wall cavity or attic rather than running new copper back under the slab.
• Whole-house repipe: When the corrosion pattern across the slab suggests the entire supply system is in the same failure cohort, a whole-house repipe with PEX eliminates the problem at the source. Smyrna's aging mid-century copper stock frequently reaches this point around 40 to 50 years of service.

We discuss all options with pricing before any work begins. No surprises, no upsells during the job.

Smyrna Neighborhoods We Serve for Slab Leak Work

Slab-on-grade construction in Smyrna is concentrated in the mid-century neighborhoods. We handle slab leak calls across the full service area, including Highland Park Smyrna, Argyle, Reed Mill, Concord Place, and Mavell Road, as well as adjacent Marietta addresses in Cobb County and Mableton to the southwest.

Frequently Asked Questions