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  • Writer's pictureShawn Kocab

Epoxy Injection For Concrete Crack Repair

When confronted with cracks in your concrete, numerous methods exist for their reparation. Among these options are concrete-based crack fillers, concrete overlays, and epoxy injection. However, if your primary objective is to preserve the structural soundness of the cracked concrete, there is only one viable choice: epoxy injection. This technique not only upholds the firmness of your concrete slab but also imparts superior waterproofing capabilities that surpass those offered by cement-based materials. Ready to learn why epoxy injection is the best route for concrete crack repair? We have all of the information you need to know about this process down below!

Why Did My Concrete Crack?

Before delving into the intricacies of crack repair, it is essential to understand the origins of the cracks in your concrete prior to embarking on any repair investments. While the age of your concrete may contribute to its propensity to crack, external factors typically exert a more substantial influence than mere age alone.

  • We have outlined the most common causes of cracking concrete down below: Misplaced or lack of expansion joints

  • Settling/ lack of supporting material

  • Type and age of concrete used

  • Thermal contraction and expansion

  • Overloading your concrete with weight

  • Heavy dropped objects

Why Should I Repair My Concrete?

Understanding the Need for Concrete Repair

Another common inquiry among clients when dealing with contractors pertains to the rationale behind concrete repairs. The question arises: why is it necessary to address the cracks in your concrete promptly? The answer lies in the accelerated occurrence of detrimental conditions facilitated by such cracks. A multitude of compelling reasons exists, underscoring the significance of timely concrete repair.

So, we have outlined the pros of repairing your concrete and the cons of not repairing your concrete down below:


  • Concrete can last decades longer

  • A waterproof surface

  • Protection from other cracks forming


  • Concretes lifespan drastically decreases

  • Low curb appeal

  • A decrease in the value of your home

Preparing For The Repair

The fundamental aspect of crack repair lies not in the mere application of epoxy crack filler but rather in the meticulous preparation of the concrete prior to the repair process. Before proceeding with the actual repair of the crack, it is imperative to ensure proper preparation of the concrete surface. This essential step sets the foundation for a successful and cost-effective process. We have provided a comprehensive outline below, detailing the recommended methods for preparing your concrete:

  1. Extend the crack: Begin by extending the crack on each side by at least one inch. This expansion provides sufficient space for the subsequent repair materials to bond effectively.

  2. Optimal crack widening: Ideally, the crack should be widened in a V-shaped cut. This specific shape enhances the adhesion and durability of the repair.

  3. Clean the area: Thoroughly clean the prepared area using wire brushes. These brushes effectively remove debris, loose particles, and any contaminants that might hinder proper bonding.

  4. High-pressure washer: Consider using a high-output pressure washer as an alternative cleaning method. The forceful stream of water helps eliminate stubborn dirt, grime, and other impurities, ensuring a clean and pristine surface.

  5. Allow for drying: After cleaning, allow the prepared area to dry completely. Natural drying can be facilitated by adequate time, or you can expedite the process using heat sources such as heat guns or air guns. Ensuring a dry surface is crucial for optimal adhesion and performance of the repair materials.

  6. Prepare the epoxy: Make sure to have the necessary epoxies readily available, as they form the primary components of the crack repair. Follow the manufacturer's instructions to prepare the epoxy mixture properly, ensuring the correct proportions and mixing techniques.

By following these recommended steps, you can establish an ideal environment for the successful application of the epoxy crack filler, maximizing the effectiveness and longevity of the repair.

Time To Repair

When undertaking the task of repairing concrete cracks using epoxy injection, there is no need to feel overwhelmed. Contrary to what online images might convey, the process is actually much simpler than it appears. To ensure your confidence in carrying out the repair, we have provided a set of helpful tips that will greatly facilitate the process:

  1. Gradual pressure application: Begin the injection process with low pressure and gradually increase it as needed. This approach allows for better control and ensures that the epoxy penetrates the crack uniformly.

  2. Beware of backflow: Be attentive to the possibility of backflow during injection. Sometimes, debris or other obstructions may impede the flow of epoxy within the crack. Take necessary precautions to prevent such obstacles from hindering the repair.

  3. Epoxy paste removal: In instances where epoxy paste has been applied and needs to be removed, employ tools such as a chisel, scraper, or even a heat gun. These tools aid in effectively removing the excess paste, facilitating a smoother and more precise finish.

  4. Proper sealing of ports: Once the injection process is complete, ensure that all ports are tightly sealed. Maintaining the seals for a minimum of 48 hours is essential to guarantee a secure and reliable bond within the crack.

  5. Assess crack width: Before proceeding with the repair, verify that the crack width is within the suitable range specified by the materials being used. Ensure that the selected epoxy is appropriate for the dimensions of the crack to achieve optimal results.

  6. Take breaks for larger cracks: When filling larger cracks, it is advisable to take short breaks periodically to assess the progress and ensure that the epoxy is properly penetrating the crack. This practice promotes better control and helps achieve thorough coverage.

  7. Marking leaks: If any minor leaks occur during the injection process, mark them using a crayon or suitable marker. This labeling enables easier identification and subsequent remedial action.

  8. Caulk to outline small cracks: For smaller cracks, consider using a bead of caulk to outline the perimeter before injection. This technique minimizes material waste and helps confine the epoxy to the intended area.

By adhering to these tips, you can confidently navigate the epoxy injection process for concrete crack repair. Remember, it is a straightforward procedure that, with careful attention to detail, yields successful outcomes.

By following these guidelines, you can approach the epoxy injection process for repairing concrete cracks with confidence. Keep in mind that this procedure is uncomplicated and, with meticulous attention to detail, can produce favorable results.

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