Tile Slip Ratings Explained: R Ratings and PTV for UK Floors

Tile slip ratings tell you how much grip a floor tile gives underfoot, and getting them right is the difference between a bathroom that feels reassuring and one that becomes a hazard the moment it gets wet. If you have ever stood in a tile showroom wondering what “R11” or “PTV” actually means, this guide explains the numbers in plain terms and shows you which rating to choose for each room in a UK home.

The subject matters more than most people think. A tile that looks handsome and dry in a showroom can behave very differently once water, soap or a wet foot is added. Slip resistance is measured, rated and printed on the technical sheet for exactly this reason, and once you can read those figures you can shop with confidence.

Why tile slip ratings matter

Wet floors are one of the most common causes of slips at home, and bathrooms, shower areas, kitchens and entrance halls are where water, condensation and muddy shoes turn up most often. A polished porcelain that is perfectly safe in a dry lounge can be treacherous in a walk-in shower. Slip ratings give you an objective way to compare tiles rather than guessing from how a sample feels in your hand.

There is a practical trade-off to understand from the start. More texture usually means more grip, but a heavily textured floor is harder to keep clean because dirt lodges in the surface. The skill is matching the grip to the room: enough for safety, not so much that mopping becomes a chore.

The two ways slip resistance is measured

Two testing families dominate the tiles you will see in the UK, and they are not interchangeable. The first is the German DIN ramp test, which produces the familiar R ratings for shod feet and the A, B, C ratings for bare feet. The second is the pendulum test, which produces a Pendulum Test Value, or PTV, and is the method UK health and safety guidance actually relies on. A good technical sheet will quote both, so it helps to understand each.

R ratings explained: R9 to R13

The R rating comes from a ramp test where a person in oiled boots walks up an increasingly steep tiled slope until they slip. The steeper the angle they reach, the higher the rating. It runs from R9 to R13:

R9 – the lowest grip, roughly a 6 to 10 degree ramp angle. Fine for dry indoor rooms only.
R10 – 10 to 19 degrees. A common choice for domestic bathroom and kitchen floors.
R11 – 19 to 27 degrees. A safer step up for wet rooms, utility floors and covered outdoor areas.
R12 – 27 to 35 degrees. High grip, suited to patios, pool surrounds and heavy commercial use.
R13 – 35 degrees and above. Maximum grip, normally reserved for industrial and commercial settings.

One thing to keep in mind: the ramp test uses boots and oil, not bare feet and water, so an R rating is a useful guide rather than a perfect prediction of how a shower floor will feel.

Barefoot ratings (A, B and C)

For anywhere people walk barefoot, such as showers, wet rooms and around pools, there is a separate barefoot ramp test that grades tiles A, B or C. A is the lowest grip, C the highest. As a rule of thumb, choose at least B for a domestic shower or wet room floor, and C for communal or family wet areas where safety is paramount. You will often see a tile quoted as both an R value and a barefoot value, for example “R11 B”.

Pendulum Test Value (PTV): what the HSE uses

The pendulum test swings a rubber slider across a wetted tile to mimic a slipping heel, and the resistance it meets becomes the Pendulum Test Value. This is the measurement British health and safety guidance treats as the benchmark, because it can be carried out on a real installed floor, wet or dry. The bands are simple:

PTV 36 and above – low slip risk.
PTV 25 to 35 – moderate slip risk.
PTV 0 to 24 – high slip risk.

As a rough cross-reference, R9 sits around 11 to 18 PTV, R10 around 18 to 34, R11 around 34 to 51, R12 around 51 to 70, and R13 above 70. Where a floor will get wet, aiming for a wet PTV of 36 or more is a sensible target. The Health and Safety Executive publishes detailed guidance on the pendulum method if you want the full technical background.

Which slip rating do you need, room by room

Here is how the ratings translate into everyday decisions around the home:

Bathroom floor: R10 as a minimum, R11 if you have young children or older relatives.
Shower tray and wet room floor: barefoot B or C, or an R11 with a textured or small-format finish so the grout lines add grip.
Kitchen floor: R10 usually copes with the occasional spill; step up to R11 if the room opens straight onto the garden.
Hallway and entrance: R10 to R11, since wet shoes and rain track in here more than anywhere.
Outdoor patio and paths: R11 as a baseline, R12 for steps, slopes and around a pool.

Small mosaic tiles are worth a mention here. Because they carry so many grout joints per square metre, they give extra grip underfoot, which is why they remain a popular and practical choice for shower floors.

Practical tips for a safer tiled floor

A high rating is only half the job. Gloss tiles become far more slippery when wet, so save them for walls and dry areas rather than wet floors. Keep textured floors clean, because a build-up of soap residue or grease can undo the grip the tile was chosen for. When in doubt, ask the retailer for the wet PTV rather than the dry one, since a floor is at its most dangerous when wet. If you are refitting a bathroom or wet room and want the tiling done to a standard that holds up for years, a professional will factor slip resistance into the specification from the outset. You can see the range of work we cover on the Bromley Tilers homepage.

Frequently asked questions

What slip rating do I need for a bathroom floor?

For a standard family bathroom, choose a floor tile rated at least R10. If children or elderly relatives use the room, or the floor gets a lot of water, step up to R11 for extra reassurance.

Is R11 slippery when wet?

An R11 tile is designed to hold grip in wet conditions and typically sits in the low slip risk band on the pendulum test. It is a sound choice for wet rooms and covered outdoor areas, though keeping it clean is important to maintain that grip.

What is a good PTV for a wet floor?

A wet Pendulum Test Value of 36 or above is classed as low slip risk and is the figure to aim for on any floor that will regularly get wet, such as a bathroom, wet room or patio.

Do slip ratings apply to bare feet?

The R9 to R13 scale is based on a shod foot test. For barefoot areas like showers and pools there is a separate A, B and C rating, and you should look for a B or C for a domestic wet area.

Are textured tiles harder to keep clean?

Yes. A more textured surface grips dirt as well as feet, so higher slip ratings usually need a little more effort to mop and rinse. Balancing safety against cleaning is why matching the rating to the room matters.

Does grout affect how slippery a floor is?

It can help. Smaller tiles mean more grout joints per square metre, and those joints break up the surface and add grip, which is one reason mosaic tiles are popular on shower floors.

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