Step‑by‑Step Guide to Repair Plumbing Beneath a Foundation

Identify the Problem and Assess Access

Start by confirming a leak under the foundation using moisture meters, visual signs of water stains, or a pressure test. Once confirmed, map the pipe's location with a stud finder or infrared camera to plan the least invasive entry point.

Prepare the Work Area Safely

Excavate a small trench around the affected pipe, keeping the trench width to 12‑18 inches to maintain soil stability. Support nearby footings with shoring if the soil is loose, and wear protective gear—gloves, goggles, and a dust mask.

Choose the Repair Method

Depending on pipe material and damage extent, select one of three common fixes:

• Clamp Repair: For minor cracks in copper or PVC, clean the area and install a rubber pipe repair clamp.
• Epoxy Injection: Suitable for small holes in concrete‑encased pipe; inject epoxy resin to seal the breach.
• Section Replacement: For severe damage, cut out the compromised section and replace it with new pipe, using couplings and solvent cement for PVC or solder for copper.

Execute the Repair

Follow the chosen method's instructions precisely. When using clamps, tighten evenly to avoid crushing the pipe. For epoxy, mix according to manufacturer ratios and apply with a putty knife, allowing full cure time before back‑filling. If replacing a section, ensure proper slope (1/4 inch per foot) for drainage and test the joint with water before covering.

Back‑fill and Restore

After confirming the repair holds, back‑fill the trench with the excavated soil, compacting in 2‑inch layers to prevent future settlement. Re‑grade the surface to direct water away from the foundation, and consider installing a French drain if moisture persists.

Cost and Time Overview