Seal Cracks and Stop Water from Coming In

Foundation crack injection repairs to prevent water infiltration and structural damage

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When you see water trickling through a crack in your basement wall or notice damp stains spreading after a storm, that opening is allowing groundwater to bypass your foundation. Foundation crack injections seal those openings from the inside, filling the entire depth of the crack with a polyurethane or epoxy material that expands and bonds to the concrete. Allied Water Services uses low-pressure injection methods that push the sealant through the crack until it reaches the exterior face, creating a watertight barrier that stops leaks immediately.

This repair method works for both structural and non-structural cracks, though the material and technique vary depending on whether the crack is stable or actively shifting. Polyurethane foam is used for cracks that continue to move slightly with temperature or settling, while epoxy is used for cracks that need rigid reinforcement. Both materials cure quickly and create a long-lasting seal that holds up under hydrostatic pressure.

If you have cracks that leak during rain or show signs of mineral deposits, get in touch to schedule an inspection and repair.

Details That Matter Most

The injection process begins by cleaning the crack surface and installing injection ports at regular intervals along the length of the crack. We seal the face of the crack with a surface patch, then inject the sealant through the ports starting at the lowest point. As the material fills the crack, it flows upward and outward, displacing water and filling voids all the way to the exterior surface.

After the injection is complete, the crack stops leaking and the concrete is reinforced against further water infiltration. Allied Water Services removes the ports once the material has cured, leaving a clean finish that can be painted or left as is. The repair takes a few hours and does not require excavation or exterior work, making it a cost-effective option for most basement leaks.

We use materials rated for permanent water contact and high pressure, so the seal remains intact even when the water table rises. This service does not address foundation movement caused by soil settlement or structural failure, and it works best when the crack is not actively widening. Large or horizontal cracks may require additional reinforcement or consultation with a structural engineer.

These questions address what homeowners need to know before scheduling a foundation crack injection.

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Key Benefits of This Service

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● Key Benefits of This Service ●

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What types of cracks can be repaired with injection?

Vertical and diagonal cracks that are actively leaking or show signs of past water infiltration can be sealed with injection. Horizontal cracks or those wider than a quarter inch may need additional reinforcement or structural evaluation.
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How long does the repair take?
Most single-crack injections are completed in two to three hours, including surface prep, port installation, injection, and cleanup. Multiple cracks or longer runs may take longer depending on the total length and number of ports required.
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Will the crack leak again after injection?
The injected sealant creates a waterproof barrier that prevents water from passing through the crack as long as the foundation remains stable. If the crack reopens due to continued settling or movement, additional treatment may be needed.
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Why do some cracks use foam and others use epoxy?
Polyurethane foam is flexible and ideal for cracks that shift slightly with temperature changes or minor settling. Epoxy is rigid and used when the crack needs to be structurally bonded and is not expected to move.
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Can this be done from the inside only?
Yes, injection repairs are performed entirely from the interior side of the foundation, which avoids the cost and disruption of exterior excavation. The sealant fills the crack all the way through to the outside face.

Foundation crack injections provide a fast and reliable way to stop leaks without major construction, and the results are visible as soon as the material cures. If water is entering your basement through visible cracks or you are seeing moisture stains that follow a crack line, contact us to evaluate the damage and seal it properly.