Concrete Floor

Yes, you can polish an old cement floor. However, be aware that the first pass with the concrete grinder may reveal a few surprises and imperfections. You may also have to contend with the consequences of previous floor coverings, such as tile or carpet, which can leave a pattern in the concrete. Old concrete is more likely to produce uneven results if you want to use a dye or other coloring.

The actual moisture level that is acceptable for your concrete floor depends on what primer or flooring material you plan to install above it. For this reason, you should check the manufacturer’s instructions for the exact details.

Generally, the moisture levels should be 3.5% to 4.5%, although it does vary. Some products can handle higher levels of moisture, so you should always test your concrete before purchasing your flooring materials.

If the moisture level in your concrete flooring is higher than what is acceptable for your primer or flooring materials, then you are looking at dealing with major flooring issues down the road. From mold and mildew, to warping, buckling, bubbling, and soft spots, you could see a wide range of moisture-induced problems.

These issues can affect not just your flooring but your foundation too. That is why measuring moisture in concrete is so important before starting a project.

Yes, you can pour concrete over an existing concrete basement floor to save time and money on fully ripping out an existing concrete slab. However, it’s not a perfect solution, so consult a pro before moving forward. You must take specific measurements, and these kinds of floors don’t have the same longevity.