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How to Repair Cracks in Concrete

Concrete is one of the most common building materials, partially for its structural stability as well as its affordability. But concrete isn’t immune to cracking. Usually this occurs either when a house settles, the ground shifts or during the curing process, when any water in the concrete slurry evaporates so that the concrete can properly harden. Cracks may be unsightly, but under normal circumstances, they shouldn’t impact a home’s structural integrity. But with that being said, it’s always a good idea to repair these cracks, as they can provide an entryway into your home for water, bugs and radon. This post will take a closer look at how to repair cracks in concrete:

How to Repair Cracks in Concrete

You could fill the crack with a masonry patching product, but these usually fail after a few years. So for the best long-term success, the best option is to permanently repair it with an epoxy injection system kit of some sorts. While this may seem daunting, it’s very feasible, even for the amateur DIY’er.

  • Prep the crack: Start by using a wire brush to clean loose concrete, paint or filler. Remove any dust and debris with a vacuum and make sure the crack is dry.
  • Block injection ports: Tap finishing nails into the crack about a foot apart from each other.
  • Mix the sealer: Follow the directions on your repair kit to mix the epoxy crack sealer to fix the crack. This is usually done with a putty knife on a scrap board.
  • Install injection ports: Slide these over the nails that you tapped into the crack during step two of the process. You may have to dab sealer onto the base in order to get it to adhere to the wall.
  • Apply the sealer: Apply sealer to the crack with a putty knife or towel. Cover the flanges of the injection ports, too. Smooth out the sealer before moving on to the next step.
  • Let the sealer cure for up to 10 hours.
  • Inject epoxy into the crack, starting at the lowest injection port with a caulk gun. Move on to other ports only when epoxy begins oozing out of those that are higher on the crack. Be sure to plug ports before moving on to the next one.
  • After the epoxy has been injected into the crack, allow it to cure for five days.
  • After five days, cut off the necks to the ports with a saw. At this step, you can also patch any ports with a crack sealer.

Cracks and concrete go hand in hand, and while the above “how to” process is one that is used on a concrete sidewall, the steps are similar for a concrete floor. Remember, just because you have a crack in your concrete wall or floor doesn’t mean that the structure is compromised – but it’s always best to tend to in order to prevent water, insects and radon from becoming an issue in your home.

23 thoughts on “How to Repair Cracks in Concrete”

  1. Concrete is so useful and practical yet it seems cracks are unavoidable. I’m glad there are ways to repair it to fix any unsightly damage. Thanks for listing each step of the process, this will be very helpful.

  2. This is a very good idea on how to repair a crack in the concrete. I like the step by step plans on how to do it, and what you will need to do the job. It seems easy to mix the sealer, and apply, but I bet it would be better if I hired a professional to do it.

  3. Concrete repair seems to have a quite a few more steps than I previously thought. It’s good to know that you should clean out any cracks before you try to epoxy anything. I’m not super handy with these kinds of things, so I might just hire a concrete repair service to make sure it’s done correctly. Thanks for the great tips!

  4. It’s good to know that epoxy is a good method that can create a long lasting seal that can fix concrete. At first, like you mentioning, it seemed a bit daunting to go through that process, but this helped me see that it really isn’t all that bad. I have some cracks on the foundation of my home that I wasn’t sure how to fix, but this helped me a ton and I plan on getting things patched up this weekend.

  5. Awesome advice! I just did my driveway for the first time and it was a lot easier than I imagined. I wish that I had seen this post beforehand.

  6. You have shared great ideas on how we can sort out the cracks problem in concrete construction. I hope people will get benefit from your advice. Thanks

  7. You mentioned that you need to let the sealer cure for 10 hours; is that different for different climates? We live in a more humid area so I am wondering if it would take longer. Eventually, we are going to be getting a new slab of concrete to put our trailer on but will just fill in the cracks for right now and hope it works. Any further information would be awesome!

  8. The process of repairing cracks in concrete doesn’t seem too extensive. I imagine that it’s best to fix any cracks found as soon as possible. I’d hate to know what types of damage untreated concrete leads to.

  9. I would have never thought to prep the crack by cleaning it. If there’s any debris in the way, that could prevent the sealer from setting properly so this makes sense. I’m sure that using a toothpick would also help to clean deep in the crack.

  10. I had a few cracks in my foundation walls and about a year ago i had them sealed to prevent water from getting in and damaging my basement (I live in Michigan, so there can be flooding occasionally) but there are still hairline cracks in my concrete floor, should i look into getting those repaired too?
    Thanks for the great post!

  11. I had no idea that you should let any sealer cure for up to 10 hours. We have had to repair our porch and sidewalk many times, and it always seems like it doesn’t work. I will have to try again and leave it for longer this time.

  12. When my sidewalk first cracked I didn’t know I had to prepare so much. I didn’t put the original sealer or anything. I just put down some epoxy and it was a disaster. I ended up having to replace the whole slab of concrete. Thank you for sharing so that others don’t do what I did.

  13. I didn’t realize that there are so many steps to a concrete repair. I am glad I now know the process but am worried I would not do it completely right. I will definitely contact a contractor to help with my repairs. Thanks for the information!

  14. I like that y ou pointed out that the epoxy will take about five days to dry. That seems like a very important thing to be aware of. My apartment has a concrete balcony and it is cracking, I have been trying to get my landlord to fix it. If he does fix it then I will need to remember to not go on it for five days just to be safe.

  15. I would recommend hiring a pro when it comes to something like cracks. DIY tips are great, but cracks that are not taken care of properly, I feel, can hurt the foundation of pavement over time. It’s just my opinion though.

  16. Thanks, I’ve just been looking for information approximately this subject for a while and yours is the best I’ve discovered till now. However, what in regards to the bottom line? Are you sure about the source?

  17. It is nice to read such clear instructions, I think I would be able to follow these really well. The only problem is that my concrete has a little more damage than I can handle on my own. Do you have any tips for finding a really great contractor to help me get it fixed? Thank you!

  18. We found some cracks in the concrete in our garage and I have been wanting to get them sealed up before the cold weather really sets in. Is it better to do it in the summer or the winter? We will be sure to let the sealer set for about 10 hours like you suggest. Hopefully, we will be able to get them fixed soon and avoid any further damage.

  19. It’s interesting to read about the process that goes into repairing small cracks in the concrete. It makes sense that some cracks could be as easy as putting some sealant in it while others might need to be entirely replaced. It’s something I’ll have to keep in mind just to make sure the driveway stays looking good after it’s finished.

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