Concrete crack repair instructions

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Choosing the Right Caulk or Sealant Use this guide to help you find the right caulk or sealant for the most common home projects. Where To Buy. Search Resources. Premium one-part, moisture-curing, non-sag elastomeric commercial-grade polyurethane adhesive sealant provides a long-lasting, flexible and durable seal for exterior gaps, joints and cracks. Premium Latex sealant formulated with a textured finish to seamlessly blend with concrete surfaces while offering outstanding flexibility and strong adhesion for a durable and long-lasting repair.

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Wait approximately 10 to 15 minutes to allow the paste-over to begin to harden. If the leak is large e. Check to see that the paste-over is hard before reinjecting or the paste-over or ports may leak.

Another option for small leaks is to clean off the injection epoxy and use paraffin or crayon to seal the holes. This may indicate that the crack either expands or branches off below the surface. This may also indicate that epoxy is running out of the back side of the crack.

If the crack penetrates completely through the concrete element and cannot be sealed, the application may not be suitable for injection repair. This may indicate that the crack is shallower than originally thought, or the epoxy is not penetrating the crack sufficiently before moving to the next port. Reinject some ports with a lower viscosity epoxy to see if the crack will take more epoxy.

The epoxy should be heated uniformly, do not overheat cartridge. This can indicate there is not enough water present to react with the polyurethane and generate foam. Introduce water into the port and continue to inject. Introduce water into subsequent ports prior to injection. In situations where the crack penetrates completely through the concrete element, and the back-side of the concrete element cannot be sealed e.

This most likely indicates that epoxy is running out the unsealed back side of the crack. In this case, the application may require a gel viscosity injection epoxy CI-GV or may not be suitable for injection repair without excavation and sealing of the back side of the crack.

Wait a approximately 10—15 minutes to allow the paste-over to begin to harden. Another option for small leaks is to clean off the injection adhesive and use paraffin or crayon to seal the holes. This may indicate there is not enough water present to react with the polyurethane and generate foam. This may indicate that the crack is shallower than originally thought, or the polyurethane is not penetrating the crack sufficiently before moving to the next port.