Slab Leaks in Louisiana Homes: What Homeowners Must Know

This guide covers slab leaks as a hidden water source, in general terms, for homes in Alexandria and Kenner alike, without making any claim about how common slab leaks are. For the service itself, the water removal page gives a general outline.

What a slab leak is

A slab leak is a leak in a water pipe that runs through or beneath the concrete slab a home is built on. The pipe may carry hot or cold water, and it may serve a bathroom, a kitchen, or a laundry room. When the pipe leaks, the water soaks into the soil beneath the slab, and from there it rises through the slab and into the flooring above, or it spreads sideways under the slab and appears in a room far from the leak itself.

Because the pipe is under concrete, the leak cannot be seen, and it cannot be reached without opening the floor. That is what makes a slab leak a hidden water source: the water is there, and the signs are there, but the leak itself is out of sight, and finding it takes a professional with the right tools and the right approach.

A slab leak is a leak in a water pipe that runs through or beneath the concrete slab a home is built on. The pipe may carry hot or cold water, and it may serve a bathroom, a kitchen, or a laundry room. When the pipe leaks, the water soaks into the soil beneath the slab, and from there it rises through the slab and into the flooring above, or it spreads sideways under the slab and appears in a room far from the leak itself.

The signs of a slab leak

The signs of a slab leak are a warm spot on the floor, where a hot-water pipe is leaking beneath, a damp patch that returns after mopping, a floor that feels soft or sounds hollow, and a water meter that moves when no water is being used. A musty smell in a room that was dry before, and a water bill that climbs without explanation, are other signs that point to a leak under the slab.

Note when you first noticed the signs, and whether they are getting worse. Photographs taken over a few days show whether a damp patch is spreading, fading, or staying the same, and that pattern is useful information for the technician. A damp patch that keeps coming back after mopping is a damp patch worth a call.

Because the pipe is under concrete, the leak cannot be seen, and it cannot be reached without opening the floor. That is what makes a slab leak a hidden water source: the water is there, and the signs are there, but the leak itself is out of sight, and finding it takes a professional with the right tools and the right approach.

Slab Leaks in Louisiana Homes: What to Know — Louisiana water guide

Why slab leaks are hard to find

A slab leak is hard to find because the water does not stay where the leak is. It soaks into the soil beneath the slab, spreads sideways, and rises through the slab in the place where the concrete is thinnest or the flooring is most porous, which may be metres from the leak itself. The damp patch on the floor shows where the water came out, not where it went in, and the leak can be in a different room entirely.

Finding the leak takes a careful approach: moisture readings across the floor, a check of the water meter, and a tracing of the pipe runs through the home. Do not cut into the floor yourself to find the leak. The source needs to be traced by someone who can check the moisture inside the floor and plan the work from those readings.

The signs of a slab leak are a warm spot on the floor, where a hot-water pipe is leaking beneath, a damp patch that returns after mopping, a floor that feels soft or sounds hollow, and a water meter that moves when no water is being used. A musty smell in a room that was dry before, and a water bill that climbs without explanation, are other signs that point to a leak under the slab.

What extraction covers after a slab leak

Extraction after a slab leak takes out the water that has reached the rooms above the slab. The standing water on the floor is removed first, then the dampness in the flooring and the lower parts of walls is checked with a moisture meter. The water under the slab itself is not reached by extraction, and that is a matter for the repair of the pipe, which is a separate job, arranged separately, and handled by a plumber.

After extraction, drying begins, and moisture readings through the drying stage decide when the job is finished. The drying stage after a slab leak can run longer than after a surface leak, because the water has soaked into the slab and the flooring, and that dampness gives itself up slowly.

A slab leak is hard to find because the water does not stay where the leak is. It soaks into the soil beneath the slab, spreads sideways, and rises through the slab in the place where the concrete is thinnest or the flooring is most porous, which may be metres from the leak itself. The damp patch on the floor shows where the water came out, not where it went in.

What to do if you suspect a slab leak

If you suspect a slab leak, call a professional. The number is (877) 624-0105, and availability is confirmed on the call. Describe what you found, where it is, and how it has changed, and mention the water meter reading if you have checked it. The technician will assess the area, trace the source where it can be found, remove the water, and check the dampness left behind.

Do not ignore the signs. A slab leak runs quietly, and the water spreads further with every week it is left alone. A call early, when the sign is still a warm spot or a damp patch, is a smaller job than a call late, when the floor is soft and the water has spread into neighbouring rooms.

Finding the leak takes a careful approach: moisture readings across the floor, a check of the water meter, and a tracing of the pipe runs through the home. Do not cut into the floor yourself to find the leak. The source needs to be traced by someone who can check the moisture inside the floor and plan the work from those readings.

Key Takeaways

A slab leak is a leak in a water pipe that runs through or beneath the concrete slab a home is built on.
The signs of a slab leak are a warm spot on the floor, where a hot-water pipe is leaking beneath, a damp patch that returns after mopping, a floor that feels soft or sounds hollow, and a water meter that moves when no water is being used.
A slab leak is hard to find because the water does not stay where the leak is.
Extraction after a slab leak takes out the water that has reached the rooms above the slab.
If you suspect a slab leak, call a professional.

Questions About Slab Leaks in Louisiana Homes: What to Know

What is a slab leak?

A slab leak is a leak in a water pipe that runs through or beneath the concrete slab a home is built on. The water soaks into the soil beneath the slab and rises through it into the flooring above, often far from the leak itself.

How do I know I have a slab leak?

Look for a warm spot on the floor, a damp patch that returns after mopping, a floor that feels soft or sounds hollow, a musty smell, and a water meter that moves when no water is being used.

Why is the damp patch far from the leak?

Water under a slab spreads sideways through the soil and rises where the concrete is thinnest or the flooring is most porous, which may be metres from the leak itself. The damp patch shows where the water came out, not where it went in.

Does extraction fix a slab leak?

No. Extraction removes the water that has reached the rooms above the slab, and the pipe itself needs a plumber, a separate repair arranged separately. Both are needed, and they are arranged separately.

Your Next Step

If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Water Removal page explains what that service covers, and the water removal page explains what that service covers when water has spread to more than one room.

Do not enter flooded rooms while you wait, and if water is leaking, turn off the shut-off valve for that fixture where you can reach it safely from dry ground.

Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after moving in, and after bringing used fixtures home.

Water extraction help is available across Louisiana. See water extraction in Laplace, LA for one local example, or find your town on the service areas page.