R ratings are a European system used to classify the slip resistance of tile surfaces, and you may come across them when choosing porcelain tiles. The classifications commonly encountered for tiles range from R9 through R13, with higher numbers representing progressively greater slip resistance.
R ratings provide more levels of slip-resistance classification, which can be particularly useful when comparing outdoor surfaces. In the U.S., DCOF ≥ 0.42 is commonly used as the starting benchmark for interior level walking surfaces expected to be walked on when wet. The R system continues through several classifications, allowing greater distinction between surfaces with increasing levels of grip.
DCOF and R ratings use different testing methods, so there is no exact conversion between the two systems. As a practical comparison, the DCOF ≥ 0.42 threshold falls roughly between the R9 and R10 range of slip resistance. The R-rating system then continues through R11, R12, and R13, providing additional classifications for surfaces with progressively greater slip resistance.
R10 can work well for In & Out applications and outdoor areas that do not regularly become very wet. For areas with greater exposure to water, R11, R12, and R13 provide progressively greater slip resistance. Many porcelain tiles intended for pool decks are R11.
Showing 1–16 of 27 resultsSorted by latest