Wet DCOF Ratings. Dynamic coefficient of friction (DCOF) ratings help designers, architects, and builders make more informed choices on tile flooring. Friction is the innate force that resists the sliding motion of one surface against another, such as the motion of a foot against a tile floor.Click to see full answer. Just so, what is a good DCOF rating?The new ANSI standard sets a minimum dynamic coefficient of friction (DCOF) rating of 0.42, as measured by the new DCOF AcuTestSM in a laboratory, for level interior floors expected to be walked on when wet.Also Know, which floor tile is not slippery? Natural stone is one of the best floor tiles for wet areas, however, if they have been sealed and polished to a glossy finish, then they too may be a little slippery. Porcelain is another floor tile option that has a non-slip range. In this way, what does DCOF stand for? Dynamic coefficient of friction Is porcelain tile slip resistant?COF Ratings for Slip Resistant Tile Flooring. Ceramic and porcelain tile floors are notoriously slippery. The very feature that makes tile easy to clean also means that it is slippery underfoot. But you can avoid slips long before you even purchase the tile.