Anti-slip tiles for a wet room or pool surround in Malta

Two different numbers can appear on the same box of tiles, and they are not two ways of saying the same thing. One is a number with an R in front of it. The other is a single letter. They come from two separate laboratory tests, they describe two different people — one wearing boots, one barefoot — and buying a wet room or a pool deck without knowing which is which is how people end up with a beautiful terrace nobody will cross in the rain.

Where the classes come from

Mosa's walking safety information sheet sets out the framework. CEN/TS 16165 is the European technical specification that collects the recognised slip-resistance test methods into one document, in annexes: a pendulum method, an inclined ramp walked in standardised footwear, and an inclined ramp walked barefoot. The two ramp methods are the ones that produce the markings you will see on a box in a Maltese showroom.

DIN 51130 — the shod ramp, R9 to R13. A tester in standardised boots walks an oil-covered tile on a ramp that is gradually tilted until they slip. The angle at which that happens gives the class:

DIN 51097 — the barefoot ramp, A, B and C. Same idea, but the tester is barefoot and the tile is wetted with soapy water rather than oiled. Class A is reached at 12°, class B at 18°, class C at 24°. The letters are cumulative: a class C tile has also satisfied B and A. The standard attaches uses to the letters — A for barefoot areas that are mostly walked dry, such as changing rooms; B for shower areas and pool surrounds; C for sloping pool edges, wading pools and steps leading into water.

That last line is the one worth remembering if you are building a pool. The steeper the surface and the more certain it is that someone will be on it barefoot and wet, the further along the alphabet you need to go.

What to specify, room by room

Ceramiche Keope's guidance for porcelain stoneware is straightforward and matches the way the classes are defined: R10 for a bathroom floor, R11 for showers, pool surrounds and outdoor areas. Set against the barefoot scale, that gives a practical shopping list for a Maltese property.

• Family bathroom floor — R10. Enough grip for a wet tiled floor without turning it into something that traps grime.
• Walk-in shower or wet room — R11, and ask for class B. A shower is a barefoot area by definition, so the shod rating alone is only half the picture.
• Terrace, roof deck, external stairs — R11. These are walked shod most of the year and get genuinely wet in a winter downpour.
• Pool surround — R11 and class B.
• Sloping pool edge, beach entry, wading pool, steps into the water — class C.

A note for anyone arriving from the UK: in Malta bathrooms are normally tiled floor to ceiling as standard, so you will be buying a great deal more tile than you are used to — but only the floor tile needs a slip class. Wall tiles are not walked on. You can pair a smooth, wipeable wall with a textured floor, and most ranges are sold that way.

Equally, slip class says nothing whatsoever about water getting through the floor. An R11 tile on a terrace or flat roof over a failed membrane is still a leak into the room below. Waterproofing is a separate layer, a separate decision and a separate cost from the tile you choose to walk on.

Nobody in Malta is going to require this of you

We could find no Maltese rule that sets a minimum slip class for a private domestic pool, terrace or bathroom. The R-numbers above are manufacturers' recommendations and European test standards, not local law. Nor is there a trade licence for tilers here, which means nobody laying your floor is obliged to have heard of DIN 51130 — the classes are a purchasing decision you make at the showroom, and they belong in writing on the order rather than in a conversation on site.

Where the floor is a condominium common part — a shared pool deck, an entrance hall, a common stair — the choice stops being yours alone. Common parts are governed under the Condominium Act (Cap. 398) and works there go through the condominium, not through the individual owner who happens to mind about it most.

The good news is that the market is ahead of the regulation. Iperceramica's outdoor porcelain collection for Malta is labelled R11 on the shelf, so an R11 outdoor tile is a normal stocked product here rather than something to be chased through a special order. That matters more in Gozo, where every delivery crosses on the ferry: ordering the right class and enough of it first time is worth real money, because the replacement box is another crossing.

Stone, and why the finish is the specification

Not everyone wants porcelain around a pool. Halmann Vella in Lija supplies Maltese hardstone for pool decks in honed, polished, natural and antique finishes. The same stone in four surfaces will not behave the same underfoot, and the finish — not the stone — is what you are actually choosing when you choose slip resistance. No R or A/B/C value is published for those finishes, so if you are going down the stone route, ask the supplier directly what testing exists for the specific finish, and be prepared for the answer to be none.

When the floor is already down

Shell-form purchases mean many buyers here specify their own finishes from bare concrete and can get this right at the start. Plenty of people cannot: you have bought a finished apartment, inherited a polished pool deck, or discovered the problem after the first wet weekend.

The fallback is post-installation anti-slip treatment, applied to the laid floor rather than replacing it. A Sliema contractor publishes swimming-pool anti-slip treatment at €35/m². Priced per square metre of treated surface, a modest pool surround is a fraction of the cost of lifting and re-laying — but it is also a fraction of a re-tile's permanence, and nobody publishes how long a treatment holds before it needs revisiting. Ask that question before you commit.

The order of preference is the obvious one. Specify the class when you buy the tile; treat the floor only when it is too late to specify.