Can You Repair Pipes Under a Slab Without Breaking Concrete?

By Double J Liner Repair · Pipe Lining · Published 2026-10-23

Most homes in San Antonio are built on concrete slab foundations, with drain lines running through the soil underneath. When one of those lines cracks or corrodes, the traditional fix is brutal: jackhammer through the floor or tunnel under the house.

UV-cured pipe lining offers another way. In many cases, under-slab drain lines can be repaired from the inside, without breaking concrete.

Why under-slab repairs are so disruptive

Breaking through a slab means removing flooring, cabinets, or fixtures, cutting concrete, digging out the pipe, and then restoring everything afterward. Families sometimes need to move out during the work. Tunneling avoids the floors but requires significant excavation from outside the home.

How lining works under a slab

The line is accessed through a cleanout or other existing access point. After the pipe is cleaned and inspected, a liner is installed and cured with UV light. The result is a new pipe inside the old one, with the slab, floors, and cabinets left untouched.

Good candidates for under-slab lining

• Cast iron drain lines with corrosion or cracks
• Lines with root intrusion near the foundation
• Pipes with leaking joints
• Lines that still hold their round shape

Protecting the foundation

A leaking drain line under the slab can wash away supporting soil or add moisture to expansive clay, contributing to foundation movement. Sealing the leak promptly helps protect the foundation as well as the plumbing.

Start with the camera

The camera tells us whether the line can be lined and exactly where the damage sits. Call Double J Liner Repair at (210) 802-2018 for an inspection and free estimate.

Frequently Asked Questions

Do I need to move out for an under-slab lining job?

Usually not. Because there is no demolition, most families stay home during the work.

Can a leaking pipe under the slab affect my foundation?

Yes. Leaks can wash out soil or saturate expansive clay, both of which can contribute to movement.

Can every under-slab line be lined?

Most lines that still hold their shape can be. A camera inspection confirms it.

Get a Free Estimate

Double J Liner Repair offers sewer camera inspections and free estimates on no-dig sewer repair in San Antonio, backed by a 10-year warranty. Learn more about sewer repair or read more sewer and pipe repair guides.

Double J Liner Repair · 1800 NE Interstate 410 Loop #216, San Antonio, TX 78217 · Phone: (210) 802-2018 · Email: Info@doublejlinerrepair.com

Hours: Monday–Friday 8:00 AM–6:00 PM, Saturday 9:00 AM–2:00 PM, Sunday closed.