Crack injection concrete is a professional process that drives a liquid resin deep into foundation and basement cracks, walls, and slabs, sealing the void from the inside out. After we scrub the surface with a wire brush and vacuum all the dust, we attach injection ports every 20 cm along the crack. A low-surface-tension epoxy or polyurethane is mixed in a dual-cartridge tube; the standard caulking tool (or glue gun–style special dispensing tool) pushes the material through the ports, forcing the resin to penetrate fine fissures and microscopic voids.
Because the resin has low viscosity and non-shrink material properties, it flows around corners and under rebar, filling even medium-width cracks that previously let in moisture, air, or mild chemicals. As the liquid cures, it expands slightly, chemically bonds to the concrete walls, and stops leaking cracks in their tracks. The cured material becomes stronger than the original concrete, restoring structural capacity and protecting the rebar from corrosion. Whether you are dealing with Type I hairline fractures or wider basement cracks, crack injection creates an impermeable seal without breaking through the wall, making it the preferred “no-excavation” solution for homeowners who want excellent results and minimal mess.
| Feature | Epoxy Injection Crack Repair | Polyurethane Crack Injection |
| Viscosity | Low-surface-tension resin flows easily into hairline cracks and protects structural integrity. | Slightly higher viscosity but foams when it meets water, making it perfect for active leaks. |
| Bond Strength | Cures hard, forms a structural weld stronger than the concrete—ideal for load-bearing foundation crack repair. | Flexible foam tolerates minor slab movement without losing contact—best for dynamic or wet conditions. |
| Cure Time | Slower set lets resin penetrate deeply; reaches full strength in 24 hrs. | Rapid reaction fills voids quickly; initial set in minutes, full cure in a few hours. |
| Use Cases | Dry or slightly damp cracks, garage slabs, concrete walls needing structural gain, and rebar protection. | Actively leaking cracks, cold joints, masonry seams, and areas where slight expansion helps fill gaps. |
| Colour | Cured epoxy is clear to amber; it is easy to paint for a clean finish. | Finished polyurethane is light yellow foam; it can be trimmed and parged with hydraulic mortar. |
Our technicians evaluate crack width, moisture, and movement, then choose the resin that will deliver excellent results—sometimes combining both in a hybrid strategy for complete protection.
