Choosing a tile with the right slip resistance is one of the most important decisions on any commercial floor. There are three ratings you'll come across in the UK.
R ratings: shod areas
The R rating comes from a ramp test (DIN 51130) where a person wearing safety boots walks on an oiled tile while the ramp is tilted. The higher the angle before they slip, the higher the rating, from R9 to R13.
- R9: dry indoor areas
- R10: most commercial areas that can get occasionally wet, such as entrances and washrooms
- R11: wetter areas and some kitchens
- R12 and R13: very wet, greasy or contaminated areas such as commercial kitchens and food production
A, B and C: barefoot areas
For barefoot areas, a separate ramp test (DIN 51097) uses bare feet and soapy water. Class A suits dry barefoot areas such as changing rooms, class B suits showers and pool surrounds, and class C suits the wettest areas such as steps into pools and sloping poolside.
The pendulum test (PTV)
In the UK, the pendulum test is widely used by specifiers and the HSE. It simulates a heel striking the floor and can be carried out on site on the finished floor. A pendulum test value (PTV) of 36 or more is generally regarded as low slip potential in wet conditions.
Getting it right
Higher slip resistance often means a more textured surface, which can be harder to clean. The best tile balances safety with the cleaning regime, so it's worth thinking about how the area will actually be used and cleaned.
This guide is general information. Always follow the tile, adhesive and product manufacturers' instructions for your specific project.