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How to Fix Sunken Concrete

By Peter Wendt

Concrete is a material made of water, gravel, cement, and sand. It is a very common material that is used to create all sorts of things from foundations to driveways. In fact, driveways and sidewalks are some of the main uses of concrete. Although concrete is a strong, durable material that is affordable, improper installation can cause it many problems.

Concrete that has a bad base such as dirt or loose gravel will sink. It will become riddled with low spots that will look very unattractive and can even be hazardous, causing falls and spills. Sunken concrete is a problem, but fortunately it can be fixed with relative ease.

Step 1: Cleaning the Concrete

The first step in fixing sunken concrete is to spray it with a chemical cleaner made for concrete. This cleaner should have phosphoric acid in it. After spraying it well, wait several minutes to let the cleaner soak into the concrete. Then, use a hose to wash the cleaner off of it.

You need to spray the concrete with this special cleaner in order to prepare it for the leveling compound you will be using.

Step 2: Readying the Repair Mixture

Now it is time to mix the concrete repair mixture with water. Pour the water and repair mixture in a bucket, and blend them together according to the instructions on the bag. In order to make the repair mixture adhere better to the concrete, you can add a liquid bonding compound.

Step 3: Applying a Slurry Coat

With the repair mixture ready, spread a small amount onto a sunken area with a trowel. The layer should be around 1/4th of an inch; this layer will help the mixture bind to the concrete.

After applying the slurry coat, you will need to wait for a few hours. This allows the coat to properly dry.

Step 4: Pouring and Leveling

When five or six hours have passed and the repair mixture’s slurry coat is dry, it’s time to pour the repair mixture into the sunken area until it is basically level with the slab. Use your trowel to spread the mixture. If you desire a broom finish, sweep the wet mixture lightly with a broom before it dries.

Finally, if you want to seal your newly-repaired concrete, you can use sealer now.

Sunken concrete is unsightly and dangerous. It can cause people to slip and fall, and it spoils the beauty of your property. Many people think they must deal with sunken concrete or pay professionals a very high price to fix it, but this is not the case. With the right tools and knowledge, sunken concrete can be fixed easily and without breaking the bank.


Peter Wendt is no stranger to sunken concrete. While living in central Texas he has encountered this problem in nearly every home he has lived in. Peter always recommends starting at this website to solve the problem.

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Article Citation
MLA Style Citation:
Wendt, Peter "How to Fix Sunken Concrete." How to Fix Sunken Concrete. 14 Apr. 2013. 18 Jul 2014 <>.

APA Style Citation:
Wendt, P (2013, April 14). How to Fix Sunken Concrete. Retrieved July 18, 2014, from

Chicago Style Citation:
Wendt, Peter "How to Fix Sunken Concrete"

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