R11 and R12 are slip-resistance classes under the German standard DIN 51130. A tile rated R11 stays safe on a steeper ramp than an R10 tile, and R12 is steeper again. R11 is common for outdoor areas and wet work zones; R12 is used where floors get greasy or oily.
The R scale runs from R9 to R13. Our main guide on slip resistance and R ratings explains the whole scale and the other test methods.
What the numbers mean
In the DIN 51130 test, a person wearing safety boots walks on a tile covered in oil. The ramp is tilted until they start to slip. The angle sets the class.
- R11 means the tile stayed safe at an angle of over 19 and up to 27 degrees.
- R12 means over 27 and up to 35 degrees.
- R13, the top class, means over 35 degrees.
Because the test uses oil and shoes, it is a guide for shod areas. Barefoot areas, such as pool surrounds and showers, use a different German test, DIN 51097, with classes A, B and C.
Where R11 is typically used
- Outdoor paths, terraces, balconies and entrance steps exposed to rain.
- Car park walkways and garage floors.
- Commercial kitchens with light grease, depending on local rules.
- Laundries, washrooms in public buildings and food-shop sales areas with wet produce.
Where R12 is typically used
- Commercial kitchens with heavy grease.
- Food processing, such as meat, dairy and fish rooms.
- Ramps and loading areas that get wet or oily.
- Workshops and car washes.
These are common practice, not law. In Germany, workplace floor requirements come from the workplace safety rules, which list rooms against R classes. Other countries use other methods. The UK relies on the pendulum test, and the US on DCOF to ANSI A326.3. Ask your customer or specifier which method and value the project needs.
The trade-off: grip against cleaning
Higher ratings come from deeper texture or more grit. That grips better but holds dirt, needs harder scrubbing and can feel rough underfoot. For a home terrace, R11 is usually enough. R12 on a domestic patio can be harder to keep clean than the customer expects.
Do not over-specify by default. Choose the lowest class that meets the rules for the area, and use a profiled surface only where it is needed.
Checking the claim
Ask for a DIN 51130 report from an independent laboratory for the exact design and finish you will buy. Check the date and that the surface code matches. If you also sell barefoot areas, ask for a DIN 51097 report as well.
Remember that results can drift between production runs. Keep an approved sample and compare it at inspection. Our guide on anti-skid tiles covers the methods factories use to add grip.
Next step
We confirm that slip reports match the surface you are buying and check it again before loading. To plan an outdoor or commercial range, book a free sourcing review.