Crack Repair

IMAG0115

We offer three (3) types of crack repair: Carbon fiber structural crack repair, hydrophilic polyurethane crack injection for waterproofing, structural epoxy crack injection.

1.) Carbon fiber crack repair uses aerospace grade carbon fiber to repair failing concrete structures (e.g. concrete joists/beams, concrete/steel tanks, etc.) Carbon fiber can also be a repair to stop bowing basement walls.

How: First, the concrete surface is prepared with a grinder to smooth out imperfections and open up the aggregate. Structural epoxy resin is then applied to the concrete surface and the carbon fiber cloth. The saturated carbon fiber cloth is applied to concrete surface and allowed to cure. Then the site is cleaned up, leaving the work area is paintable in 24 hours.

2.) Hydrophilic polyurethane crack injection (typically referred to as just crack injection) is done from the inside of the home to waterproof and seal leaky foundation cracks.  The resin is injected from the inside starting at the bottom and pushes against the soil load on the outside of the foundation wall to move up throughout the crack until the crack is entirely sealed all the way through.  The polyurethane is popular because it becomes a soft foam that remains flexible to move with season frost and thaw cycles.

How: A six inch area around the leaky crack is cleared of dust, dirt, and debris with a wire brush. A series of injection ports are then adhered to the foundation wall over the leaky crack with fast-set epoxy paste. The rest of the crack is covered with a fast set epoxy paste on the inside and outside. After the fast set epoxy paste has hardened, the hydrophilic polyurethane foam resin is injected into the ports over the crack, starting from the bottom and working our way up.  The hydrophilic polyurethane foam resin mixes with water to create a soft flexible foam that moves with frost and thaw cycles. After 90 minutes, the process is complete and the ports can be knocked off if the home owner wishes.

3.) Structural epoxy crack injection works similar to the polyurethane crack injection.  The epoxy will waterproof the crack, but also “glue” the foundation back together.

How: A six inch area around the leaky crack is cleared of dust, dirt, and debris with a wire brush. A series of injection ports are adhered to the foundation wall over the leaky crack with fast set epoxy paste. The rest of the crack is then covered with a fast set epoxy paste on the inside and outside. After the fast set epoxy paste has hardened, the structural epoxy resin is injected into the ports over the crack, starting from the bottom and working our way up. The structural epoxy hardens and glues the foundation together and waterproofs the crack at the same time. The injection process takes only 90 minutes, but the structural epoxy resin takes 6-8 hours to cure. After the resin cure time, the injection ports can be knocked off.

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