How to Repair a Cracked Concrete Driveway

It’s a given that a concrete slab will become cracked over time. This is particularly true at cold joints, where two concrete slabs meet that were poured at different times.

If the concrete slab is outdoors, such as a driveway, cracks need to be sealed properly. This keeps water from seeping under the slab and eroding the soil, which can cause the concrete to settle.

To seal a cracked concrete slab:

  • Remove any debris or loose concrete in the crack using a screwdriver, followed by a wire brush.
  • Use a broom or leaf blower to clean out the crack.
  • Fill the crack with concrete repair caulk, such as Polyurethane Concrete Crack Sealant from Quikrete.
  • On cracks that are wider than 1/4” push foam backer rod into the crack with a screwdriver, so it’s 1/2” below the surface, then fill the crack with concrete repair caulk.

Watch this video to find out more.

Further Reading


Concrete driveways require a lot less maintenance. You want to keep them nice and clean, but more importantly, you want to be sure you fill up any cracks you might have, especially a crack like this.

Now, this is called a cold joint, where this slab and this slab were poured at different times. And no matter what you do, it’s going to result in cracked concrete.

Now, here’s what’s important about sealing that crack up, is that if you allow rain to get in this crack, sooner or later it’s going to affect the integrity of the soil below it. This will start settling and cracking, I’ve seen it a hundred times.

Here’s all you have to do is take a screwdriver, and just kind of scratch away at any debris you may have in the crack. Then, a wire brush to really clean it up really well. And then use a whisk broom. Or, I’ll tell you what, a leaf blower works really well on this as well.

Then, the important thing is a concrete repair caulk, this particular one is a self-leveling. And on a crack like this, you basically are just filling it in, and making it nice and flat.

Now, that works well on cracked concrete like this. But if you have a crack that’s a little larger — for some reason on this side, it’s a little larger than on that side — you’ll need this extra step.

It’s a backer rod, and you use this anytime you’re caulking anything on the outside of your house that’s larger than say a quarter-inch or three-eighths. And here, I’m going to put it down in the crack, like that. Screwdriver, push it down about a half-inch. Then, I’ll caulk right over it, just like I did the smaller crack.


  1. Great video, I did this on a cement slab in our backyard. parts of the crack was too small to use the backer rod, I had air bubbles created from below. Any suggestions on how to avoid that? I also have a good 1.5″ gap between my driveway and garage floor. Any suggestions on how to fill in a joint that wide? Thanks and love the show!

  2. Do not know how this happened (was like this when I bought the house). There is a 1″ Sq cut out of concrete driveway; approximately 1/2″ deep. Can this space be filled using directions for repairing large cracks?

  3. A friend of mine told me that I should also caulk the cracks between the concrete slabs even if they have not been damaged.

    Is it true?

  4. I recently purchased a house that has a driveway covered with maybe 3′ or 4′ concrete sections (blocks?) They are approximately 3″ thick and there is a gap between them. The gaps or spaces are about 3″ by 2″.

    I would like to fill and seal these with the concrete mix in your video and them put a skim thinner coat over the entire driveway as you did in the video.
    Are these spaces in between each section fillable? I was thinking of filling them partially with rebar and then fill with the quikcrete repair concrete?

    Any thoughts?

  5. I’m going to seal my concrete driveway with Ghostshield Lithi-Tek LS 9500 sealer. I want to backer rod/ caulk concrete joints on driveway. Should I apply caulk before or after I apply the sealer?

  6. Had a driveway replaced two years ago and I already see large cracks in it. Why would a two year old concrete driveway have cracks already?

    • Hi, Megan!
      Numerous factors could apply in this case. Was the foundation poured amid low temperatures? Did the concrete have control joints? Was too much water added to the mix? These are questions to consider when analyzing your driveway’s cracks.
      Thanks for your question!

  7. Thank you for the video. I did this as did my neighbor, however it did not really work. We both used the same product as you, the self leveling concrete. I’m going to see if I can send you a picture. Also now another larger crack has just appeared, much larger! I look forward to your thoughts.

  8. I have a triangle piece of concrete about 3 feet long and about 3 inches thick . It has broken away in the middle my driveway. It has sunk about 4 inches so I can see a gas line underneath it. What do I do? Contact the gas company? it has happened because of a washout underneath it. Do I try and repair it myself? An uplifting foam Company gave me bid of over $4,000. Other companies have said I need to replace the whole section of concrete. My driveway is @ 30 yards long and 10 feet wide. My wife and I are school teachers and have no $ to hire someone.

  9. The video on repairing two sizes of cracks in a concrete driveway was so helpful. Thank you!

    Question on whitewashing a fireplace. Do we need to use the lime paint as shown in the video, or can we use Kilz. I have lots of leftover white paint.
    Thanks again!
    Love your show

    • Hi, Leslie!
      We’re glad that you enjoyed the concrete cracks video.
      Regarding whitewashing: limewash paint is non-toxic and has no volatile organic compounds. It has color variations and movement that other types of paint can’t easily mimic. Many people have whitewashed surfaces with regular paint and water, with varying results.
      But for the true old-world look, with an eye-catching patina that improves with age, we recommend limewash paint.
      Good luck!


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