Foundation Friday: Case Study: Basement Pipe Penetration Leak Repair (Mendon, MA)

Before: Active water leak around pipe penetration during rain and snowmelt. After: Injection ports installed and polyurethane injected to seal the penetration.

The Problem: Water Entering Around a Pipe Penetration

Even in newer homes, basement water intrusion can occur when water finds a path through the foundation wall. In this Mendon, Massachusetts home built in 2024, water was leaking around a pipe penetration in the poured concrete foundation wall.

During heavy rain and snowmelt, water pressure forced water through the small gap between the pipe sleeve and the concrete wall. This created a visible stream of water running down the wall and pooling on the basement floor.

Pipe penetrations are a common entry point for basement leaks because they create a natural break in the concrete foundation.

The Solution: High-Pressure Polyurethane Injection

To permanently stop the leak, our team used a high-pressure polyurethane injection system designed specifically for active water intrusion.

The repair process included:

• Preparing the penetration area around the pipe

• Installing injection ports around the penetration

• Injecting expanding polyurethane grout under pressure

• Allowing the material to expand and seal the voids behind the wall

Polyurethane reacts with water and expands to form a watertight barrier, preventing water from entering the basement through the pipe penetration.

The Result: A Fully Sealed Pipe Penetration

After the injection process was completed, the penetration was fully sealed and the active water intrusion was stopped.

The repair prevents water from entering the basement and protects the foundation from future leaks caused by seasonal rain and snowmelt.

Even in newly built homes, waterproofing details around pipe penetrations are critical to keeping basements dry.

Why Pipe Penetrations Leak in Basements

Pipe penetrations are a frequent source of basement leaks because:

• Pipes pass directly through the foundation wall

• Small gaps can form between the pipe sleeve and concrete

• Pressure forces water through these openings

Professional injection repairs seal these penetrations from the inside and stop water intrusion without excavation.

Completed repair sealing the pipe penetration to stop water intrusion.

If water is leaking into your basement through a pipe penetration or foundation crack, basement waterproofing options can permanently seal the problem.

Call 833-NECRACK (833-632-7225) or contact us online to schedule an inspection.