What do anti-slip tile ratings mean?

When browsing for tiles you’ll likely come across the “R” rating system — the letter R followed by a number such as R9, R10, R11, R12 or R13. This rating tells you how much grip a tile offers, and helps you choose the right floor tile for dry rooms, wet rooms, outdoors and commercial spaces.

The “R” stands for ramp test. In this test, a person walks on a tiled ramp that is gradually tilted. The angle at which they start to slip determines the R grade. A higher number means stronger anti-slip performance.

Not every tile carries an R rating, but tiles designed for grip — especially floor and outdoor tiles — usually will. Here’s a simple guide to each grade and where it’s best used.

R9 to R13 – which rating do you need?

R9

The lowest anti-slip rating. Fine for most dry domestic areas where heavy slip resistance isn’t essential — for example living rooms and bedrooms. Porcelain R9 tiles can also suit lighter commercial use where anti-slip properties aren’t a priority.

R10

Ideal for kitchens and bathrooms at home. R10 tiles also work well as lighter-use commercial floors, and porcelain versions can be suitable outdoors in sheltered areas.

R11

Suitable for both dry and wet environments. A strong choice for bathrooms, kitchens, hallways and living rooms, as well as offices and many exterior areas. Our 20mm outdoor porcelain tiles are typically R11-rated for British gardens, patios and pool surrounds.

R12

High grip for wet and busy spaces. Great for exteriors, kitchens, bathrooms and hallways, plus commercial areas such as communal showers, changing rooms, poolsides, hotel foyers, shopping centres and airports.

R13

The highest common rating — for areas frequently exposed to water, such as swimming pools, spas and wet outdoor paths. Use R13 where maximum slip resistance is needed.

Pendulum Test Value (PTV)

Alongside R ratings, you may also see a Pendulum Test Value (PTV). This measures slip resistance with a rubber-footed pendulum swung across the tile surface. A PTV of 36 or above is generally considered anti-slip.

Quick tips for choosing

  • Dry domestic rooms: R9 is usually enough.
  • Kitchens & bathrooms: Aim for R10 or R11.
  • Outdoor patios & paths: R11 or higher; choose R12–R13 for steeper or frequently wet areas.
  • Commercial wet zones: R12 or R13.

Still unsure? Browse our anti-slip floor tiles, order free samples, or ask the team in our Cardiff or Swansea showrooms — we’ve been helping customers choose the right tiles since 1978.