How to Fix Concrete Floor Cracks


Repairing concrete flooring is a relatively simple project for most DIYers, making the concrete look better while extending the life of the concrete by protecting it from harsh conditions.

Here are some steps to take if you want to repair your concrete flooring.

Clean the Floor

Prior to using any concrete filler, you should make sure your floor is devoid of oil and dirt. Use a cleaner to cut the grease if there is any grime present, which will help improve the bond of the filler to the cement.

Chisel Cracks Until They’re Clean

Next, use a cold chisel and hammer to remove any large pieces residing in the crack. Then hold the chisel at an angle and hit it with the hammer to chisel the crack, which is referred to as “keying.” This further helps with bonding to the concrete.

Vacuum and Brush

After the keying process is complete, clean up and remove any remaining debris and dust, using a whisk broom followed by a thorough vacuuming.

Spread the Concrete Patch

Using the concrete filler is simple: Simply cut the nozzle off the bottle and slowly fill in the cracks. If you’re using a mixed concrete filler, mix based on the manufacturer’s directions and trowel the patch into the crack.

Then check the cracks after a few minutes to determine whether or not the filler has properly settled. If it isn’t tight enough, add more, and use a trowel to further smooth out the cracks.

Allow the Patch to Cure

Allow the filler to cure overnight or the duration according to the manufacturer’s directions, and then check it periodically to see if it requires additional filler.

Seal the Concrete and Patch

Following the patching process, you should seal it. Concrete absorbs most stains, but sealing can prevent this. There are many different products you can use for concrete sealing, but a heavy-duty water-based polyurethane is the most ideal. If the floor has a rough finish, you should apply the polyurethane using a brush or broom with bristles that can push the sealer into the surface. Smoother surfaces will benefit from a roller.

The great thing about water-based polyurethane is that it dries fast, allowing you to apply a second coat a few hours after the first is applied. These polyurethanes don’t leave a bad smell, either, unlike other sealers.

Following these steps, you can benefit from flooring that’s fully resurfaced  and ready to handle vehicle or foot traffic. However, if you want to keep your floors in even better shape, you’re better off getting a high-quality epoxy sealant to maximize your floor’s protection against damage of all types. You should contact professionals to install this, and you’ll be able to avoid additional concrete cracks as a result. This way you won’t need to continually repair cracks and save money in the process. However, this is only ideal for more commercial and industrial applications with large flooring space.

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