Solution
Epoxy Crack Injection: Sealing and Restoring Cracked Concrete
Epoxy injection doesn't just fill a crack — it bonds the two sides back together with a material stronger than the concrete itself.
Let's take the first step toward a stable home.
A licensed local inspector will visit your property, walk you through every finding, and send a written estimate — no cost, no pressure.
- ✓ Licensed & Insured
- ✓ Lifetime Warranty
- ✓ Free On-Site Inspections
Epoxy crack injection is a structural repair method for concrete foundation walls, slabs, and beams that have developed cracks due to settlement, curing shrinkage, hydrostatic pressure, or thermal movement. Low-viscosity epoxy resin is injected under low pressure through surface ports installed across the crack at regular intervals, filling the crack from its deepest point outward. As the epoxy cures, it bonds the two concrete faces together with tensile strength greater than the surrounding concrete. The result is a monolithic repair that restores the structural continuity of the cracked section. Epoxy injection is appropriate for dry or dormant cracks — cracks that are not actively wet and not in active movement. For cracks with active water seeping through them, polyurethane foam injection (which expands and seals in the presence of moisture) is often the appropriate first step, followed by epoxy once the wall has been dried out.
How It Works
Surface ports — small plastic fittings — are bonded across the crack face at 6 to 12 inch intervals, depending on crack width and concrete thickness. The crack face between ports is sealed with epoxy paste to contain the injected resin. Beginning at the lowest port (for vertical cracks) or one end (for horizontal cracks), low-viscosity epoxy is injected through each port in sequence. The epoxy flows under gravity and light pressure through the crack width, filling void space as it travels. Each port is monitored: when epoxy appears at the adjacent port, that port is capped and injection moves forward. After all ports have been injected and capped, the resin is allowed to cure fully. The ports are removed, the surface paste is ground flush, and the repair is complete.
Problems This Solves
"A lot of people ask if we can just inject the crack and be done. For a dormant crack with no active movement behind it, yes — that's a legitimate repair. But if the crack opened because of foundation movement that hasn't been corrected, we're sealing a symptom while the cause keeps working. The sequence matters."
How It Works
What to expect from start to finish.
-
Crack Assessment
The crack is evaluated for width, depth, length, moisture content, and whether it shows any signs of active movement. Epoxy injection is confirmed as the appropriate repair material based on these conditions.
-
Surface Cleaning and Port Placement
The crack face is cleaned of loose concrete, efflorescence, and contaminants that would prevent epoxy bonding. Injection ports are bonded across the crack at the prescribed spacing.
-
Crack Face Sealing
Epoxy paste is applied to the concrete surface between ports, sealing the crack face to contain the injected resin during the fill process.
-
Sequential Low-Pressure Injection
Beginning at the lowest port, low-viscosity epoxy resin is injected through each port in sequence. Injection at each port continues until resin flows from the adjacent port, confirming the crack section between those ports is filled.
-
Port Capping and Cure
Each completed port is capped to retain resin. The injected section is allowed to cure undisturbed for the manufacturer-specified cure time, typically 24 to 48 hours under ambient conditions.
-
Port Removal and Surface Finishing
After full cure, ports are removed and the surface paste is ground flush with the surrounding concrete. The repair surface is left cleanly finished.
FAQ
Frequently Asked Questions
Is epoxy injection as strong as the original concrete?
Cured structural epoxy has tensile bond strength that typically exceeds the tensile strength of standard concrete. The repaired crack is not the weakest link in the wall after a proper injection. If additional movement occurs after injection, new cracking will appear at a different location rather than reopening the injected crack.
Can epoxy injection be used on wet or leaking cracks?
Not directly. Epoxy does not bond to wet concrete surfaces and will not flow correctly through cracks with active water. For actively leaking cracks, polyurethane foam injection — which expands in the presence of moisture and forms a watertight seal — is the first step. Once the crack is dry and stable, epoxy injection can follow for structural bonding if needed.
If my foundation has settled, will injecting the crack fix the settlement?
No. Epoxy injection repairs the crack in the wall but does not address the underlying foundation settlement that caused it. If the foundation is still actively settling, the injected crack may re-open or new cracks may form nearby. Epoxy injection is most appropriate after the foundation has been stabilized, as the final step in a complete repair sequence.
How long does epoxy injection last?
The cured epoxy repair is permanent. The material does not degrade or relax under normal service conditions. The repaired location will not re-crack from the same cause because the bond strength exceeds the surrounding concrete. Future cracking, if it occurs, will happen at a new location in response to new movement.