What is Slab Under Plumbing?

Slab under plumbing sounds complicated, but while it may be a complicated process to solve, it’s not complicated to understand. Plumbing Solutions in Lexington offers the best plumbing services, including slab under plumbing, rough-in plumbing, sewer and water installation, and trim-out plumbing. We also specialize in new construction residential plumbing installation needs. Below, we’ll go into detail on what is slab under plumbing and how we can help when you need it. Contact us for all your plumbing repair needs!


Slab under plumbing, or under slab plumbing, is plumbing under concrete slabs. Oftentimes when homes or buildings are constructed, the plumbing pipes are laid, and then the concrete company comes in and pours a concrete surface, be it a foundation or what have you. Sometimes they pour this concrete surface directly over the pipes, fully encasing them in concrete. While this doesn’t impede the function of the pipes themselves (water and sewage can still flow freely), it can make it extremely difficult if one of those pipes cracks and begins to leak. This can cause a real problem as the water can begin to infiltrate the ground around it, causing a weakening of your foundation and many other potential problems.


As you can imagine, repairing slab under plumbing can be a real problem, depending on the extent of the concrete casing. Oftentimes, the plumber has no idea where the pipe even is beside from the diagrams, but it physically can’t be seen. As a homeowner or business owner, you should look for the following signs of a leak under your concrete slab:

  • Uneven floor
  • Crack in walls
  • Sticky doors
  • An increase in your water bill

Your local plumber may have to jackhammer away the concrete first in order to get to the piping or drill underneath the concrete itself and then tunnel under. If you have noticed one of these signs and suspect a slab leak, you’ll need to call your local plumber immediately. They will come out and inspect the problem and will come up with a written estimate in order to fix it. Slab leaks need to be taken seriously since they can cause major problems on down the road.

Once you have found the source of your plumbing leak and taken the steps to repair it (got rid of the concrete and replaced the piping, etc), you need to ensure the pipe and concrete are laid correctly this time. Oftentimes with a slab leak, the problem stems from an improperly performed rough-in. Rough-in plumbing is where the pipes are laid correctly when beginning a new build or when adding on a new addition to the home of office space. Many times these are either done hurriedly by professional plumbers, or they are DIY jobs. In either case, you’ll want to ensure that the pipes are laid correctly and that they can be accessed easily in the future if need be. You may have to have new concrete poured if you demoed out some of the old concrete.


As you can see, slab under plumbing repairs can be extensive and the costs can add up quickly due to the complicated nature of the job. Hence, it’s best to call in a professional plumber who can fix your under slab leak and ensure moving forward that everything is in its proper place.

Plumbing Solution in Lexington can help with your slab under plumbing. Since we offer rough-in plumbing services as well, we can repair both. We believe in offering fanatical customer service wherever we go. Call us today!

Leave a Comment