How to Fill & Level a Concrete Floor

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Concrete floors are durable and tough surfaces. Concrete is composed of cement, aggregate, water and various chemical additives. The differences between various types of concrete mostly come from the differences in aggregate used in making it. However, all concrete floors are fairly similar and can be treated, maintained and repaired in the same way. If you want to lay flooring in your house, you may want to know how to level a concrete subfloor first.

Things You'll Need

  • Chisel or hammer
  • Brush
  • Stiff broom
  • Damp cloth
  • Portland cement
  • Masonry sand
  • Latex adhesive
  • Trowel
  • Putty knife
  • Steel trowel
  • Vacuum cleaner
  • Straight piece of lumber
  • Lever
  • Chalk
  • Concrete floor grinder
  • Use a chisel or a chipping hammer to roughen the surface around the uneven areas of the concrete floor surface. You will use concrete mixture to fill the uneven areas and roughing up the surface will make the concrete adhere to the existing concrete floor.

  • Sweep the area around the chipped cuts and cracks with a soft brush or broom. Make sure to remove all the loose particles from the area. Clean the area with a damp cloth to remove any remaining dust.

  • Make a repair concrete mixture by combining 1 part of Portland cement, 2 1/2 parts of masonry sand and a little latex-based adhesive until you reach a paste-like consistency.

  • Apply the repair mixture to the uneven areas of the floor. Use a trowel and a putty knife to fill in all the holes. Allow mixture to dry for one hour and then run a steel trowel over the patched areas to make the surface smooth. Cement will settle and lower over time so the patched area should be slightly higher than the rest of the concrete surface. Allow the repaired area to cure for at least two days.

  • Sweep the whole concrete floor with a stiff broom to remove all loose dirt and dust. You can also use a vacuum cleaner for this job. Sand the whole surface of the floor with coarse grit sandpaper before vacuuming it again.

  • Determine the low and high areas of the patched floor using a lever and a rigid straight piece of lumber. Mark the high and low places on the floor with a chalk.

  • Treat the floor with a floor grinder. Move the grinder across the floor surface and concentrate on the areas you marked as high. Keep treating the floor surface with the concrete grinder until it is completely level and even.

  • Sweep the concrete floor or vacuum it. Be very thorough and remove all loose dirt and dust.

Tips & Warnings

  • Protect the walls in the room with tarps and sheets.
  • Always use a protective mask over your mouth and nose to avoid inhaling dust particles from the concrete floor.

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References

  • Photo Credit rénovation de façade 9 image by Nathalie P from Fotolia.com
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