How to Repair and Patch Self Leveling Concrete Floors

How to Repair and Patch Self Leveling Concrete Floors

Are you looking to repair and patch self leveling concrete floors in your home or commercial space? Self leveling concrete is a popular choice for flooring due to its smooth and durable finish. However, over time, cracks and damages can occur, impacting the overall appearance and functionality of the floor. In this article, we will discuss the step-by-step process of repairing and patching self leveling concrete floors to ensure they remain in top condition for years to come.

Understanding Self Leveling Concrete Floors

What is self leveling concrete?

Self leveling concrete is a specialized type of concrete that is designed to flow smoothly and evenly across a surface, filling in low spots and creating a level, flat finish. It is commonly used to repair uneven or damaged floors, or as a finish coat over an existing concrete surface.

Advantages of self leveling concrete

  • Easy to install: Self leveling concrete can be applied quickly and easily, saving time and labor costs.
  • Durable: Once cured, self leveling concrete is extremely strong and resistant to wear and tear.
  • Leveling properties: Self leveling concrete can create a perfectly flat surface, making it ideal for a variety of applications.

Common issues with self leveling concrete floors

  • Uneven application: If not applied correctly, self leveling concrete can result in uneven surfaces or low spots.
  • Improper curing: Proper curing is essential for self leveling concrete to achieve its full strength and durability.
  • Moisture issues: Self leveling concrete can be sensitive to moisture, so it is important to address any underlying moisture issues before installation.

    Assessing the Damage

When it comes to repairing and patching self-leveling concrete floors, the first step is to assess the damage. This is crucial in order to determine the best course of action and ensure a successful repair. There are a few key things to look out for when assessing the damage:

Identifying cracks and holes

The most common issue with self-leveling concrete floors is the presence of cracks and holes. These can be caused by a variety of factors, such as settling of the concrete, impact damage, or improper installation. It’s important to carefully inspect the floor for any visible cracks or holes, as well as any areas where the concrete may be uneven or unlevel.

Determining the extent of the damage

Once you have identified any cracks or holes, it’s important to determine the extent of the damage. This will help you decide whether a simple patching job will suffice, or if more extensive repairs are needed. In some cases, the damage may be limited to a small area and can be easily fixed with a patching compound. However, if the damage is more extensive, you may need to consider resurfacing the entire floor.

Checking for moisture issues

Another important factor to consider when assessing the damage to a self-leveling concrete floor is moisture. Excess moisture can cause the concrete to deteriorate and lead to further damage over time. Before making any repairs, it’s essential to check for signs of moisture issues, such as water stains or dampness. If moisture is present, it will need to be addressed before any repairs can be made to ensure long-lasting results.

Preparing for Repair

Gathering necessary tools and materials

Before starting the repair process, make sure you have all the tools and materials needed. This may include self-leveling concrete mix, a trowel, a bucket for mixing, a level, a drill with a mixing attachment, and protective gear such as gloves and goggles.

Cleaning and prepping the surface

The key to a successful repair is a clean and prepped surface. Start by removing any loose debris and sweeping the area thoroughly. Use a degreaser or cleaner to remove any oil or grease stains. It’s important to have a smooth and clean surface for the self-leveling concrete to adhere to.

Ensuring proper ventilation

Self-leveling concrete can emit strong fumes during the mixing and application process. Make sure to work in a well-ventilated area or use a fan to help circulate the air. If working indoors, consider opening windows and doors to allow for proper ventilation. Additionally, wearing a mask can help protect against inhaling any harmful fumes.

Repairing Small Cracks and Holes

When it comes to repairing small cracks and holes in self leveling concrete floors, there are a few different methods you can use depending on the size and severity of the damage. Here are some common techniques:

Filling small cracks with epoxy

For small cracks in your self leveling concrete floor, epoxy is a great option for filling and sealing the damaged areas. Simply mix the epoxy according to the manufacturer’s instructions and apply it to the crack using a putty knife. Make sure to smooth out the epoxy to create a seamless finish.

Using patching compound for minor holes

If you have minor holes in your self leveling concrete floor, patching compound is a quick and easy solution. Simply apply the patching compound to the hole using a trowel or putty knife, making sure to fill the hole completely. Allow the compound to dry according to the manufacturer’s instructions before sanding and smoothing the area.

Sanding and smoothing the repaired areas

Once you have filled in the cracks and holes in your self leveling concrete floor, it’s important to sand and smooth the repaired areas to ensure a seamless finish. Use a fine-grit sandpaper or a sanding block to gently sand down any rough patches or uneven surfaces. Once you have smoothed out the repaired areas, your self leveling concrete floor should look as good as new.

Leveling Uneven Areas

Before starting the repair process, it is important to identify and mark any uneven areas on the concrete floor. This can be done by using a level or straight edge to determine where the dips and bumps are located.

Mixing and applying self leveling compound

Once the uneven areas have been identified, it is time to mix the self leveling compound according to the manufacturer’s instructions. Typically, this involves combining the compound with water and mixing until it forms a smooth, pourable consistency.

Next, pour the mixed compound onto the uneven areas of the concrete floor. Use a trowel or a screed to spread the compound evenly across the surface, making sure to fill in any low spots and create a level surface.

Using a trowel or screed to level the surface

After the self leveling compound has been applied, use a trowel or screed to smooth out the surface and ensure that it is level. Work quickly, as the compound will start to set within a few minutes.

Make sure to pay special attention to the edges of the repaired area, as these can be tricky to level properly. Use the trowel or screed to feather out the edges and blend them seamlessly with the surrounding concrete.

Allowing sufficient drying time

After leveling the surface, it is important to allow the self leveling compound to dry completely before walking or placing heavy objects on it. This typically takes between 4-6 hours, but can vary depending on the specific product used.

Once the compound is dry, the repaired area can be sanded down and finished to match the rest of the concrete floor. This will help to create a seamless and professional-looking repair job.

Finishing Touches

Sanding down any rough spots

Before the self leveling concrete floor is completely dry, check for any rough spots or imperfections that may need to be smoothed out. Use a handheld sander or sandpaper to gently sand down these areas until they are level with the rest of the floor. Be careful not to remove too much material, as this can create uneven patches.

Applying a sealant or topcoat

Once the self leveling concrete floor is fully cured and dried, consider applying a sealant or topcoat to protect the surface and enhance its appearance. There are various options available, including epoxy coatings, polyurethane sealants, or decorative finishes. Follow the manufacturer’s instructions for application and allow sufficient drying time before walking or placing heavy objects on the floor.

Cleaning up the work area

After completing the repair and patching process, it is important to clean up the work area to ensure a professional finish. Remove any tools, materials, and debris from the floor, and sweep or vacuum to remove any dust or dirt. Wipe down the floor with a damp cloth or mop to remove any remaining residue, and allow the floor to fully dry before using or applying any additional finishes.


In conclusion, repairing and patching self-leveling concrete floors can be a simple and cost-effective solution to fixing cracks, holes, and other imperfections. By following the steps outlined in this article, you can easily restore the appearance and functionality of your concrete floors. Remember to properly prepare the surface, choose the right patching material, and allow sufficient time for the patch to cure before resuming normal use of the floor. With a little time and effort, your self-leveling concrete floors can look as good as new.