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It is a common misconception that polished concrete floors are slippery. This is just not true. A polished concrete floor can be slip resistant in both wet and dry environments. In some cases they are more slip resistant than the resinous flooring systems. The slip resistance of polished concrete actually has a greater coefficient of friction (COF) than most coated floors considering a typical specification of polished concrete. The COF of resinous flooring systems can be increased by adding non-skid additives (NSA) in the protective top coats. The NSA is mixed with the topcoat or broadcasted on the surface of the topcoat immediately after its application.
In general, a polished concrete floor has slip resistance that meets or exceeds industry standards of 0.65 COF. The flat surface produced by a fine polish puts the sole of the shoe directly in contact with the concrete surface. The level of slip resistance depends on the concrete polishing specification - the level of honing and polishing that's done and grit level of the tooling used. Some coatings have this COF of 0.5 to 0.65 but they can be taken up to 0.9 by adding NSA. Below, you will find a chart which has been provided by the CPC that validates this information.