Pool deck flooring: non-slip and cool underfoot

Which stone around a pool does not get hot?

Pale and porous: beige limestone, travertine and pale sandstone heat up far less than dark stones. A dark tile in July sun passes 60 °C; a pale matt one stays around 40–45 °C. So colour matters more than rock type, and samples are tested in the sun before ordering.

Thickness and substrate also matter: a thick slab on mortar heats more slowly than a thin one on a backing. Shade from a pergola and umbrellas removes half the problem. Polished stone is slippery and is not used for walkways beside water, even when pale.

What slip class is needed by a pool?

Class 3, the highest. Under CTE DB-SUA 1, pool areas where people walk barefoot and the pool floor down to 1.5 m depth require class 3, which means a slip resistance value Rd above 45. For comparison: class 1 is 15–35 and class 2 is 35–45.

The value is established by a pendulum test, and the manufacturer must supply the report. Do not rely on the word non-slip or on ratings from other scales such as R11 or R12: that is a different method. Look at Rd and the class, and check on a wet surface, since dry always slips less.

Texture holds slip resistance better than polish: bush-hammered (abujardado), sandblasted and structured finishes. After years of use and chlorine the texture wears down, and the surface is treated or replaced.

Is travertine a good idea by the pool?

Yes, given the right treatment. Travertine is pale, cool to the touch and handsome beside water. Its surface is porous and the pores fill with dirt and salt, so it is sealed with a protective impregnation that is renewed every few years.

There are problems with stone slabs at salt-water pools: salt crystallises in the pores and breaks the stone from within. For salt water choose dense slabs, seal them and rinse with fresh water. Acid cleaners eat travertine, and that is the most common mistake.

An alternative if you want the travertine look without upkeep: porcelain with a travertine pattern. It withstands chlorine and salt better than stone, needs no sealing and clears the slip class with room to spare. The choice between them is made on whether you need the authentic material.

Why is 20 mm porcelain good for a pool?

It does not absorb water, does not fear chlorine, salt, acids or frost, needs no sealing and has stable colour. At 20 mm thick the pieces can be laid on pedestals, gravel or mortar and do not mind furniture loads. The texture is chosen for class 3.

Drawbacks: colour is sometimes uniform, light by the water flattens the pattern, and dark shades heat up like dark stone. Choose pale matt finishes. On pedestals with a gap the tile ventilates well and dries fast. Under the tiles make sure of falls and drainage: water leaves through the joints.

If laid on mortar, movement joints and an exterior-grade adhesive are needed. Small 30×30 tiles are cheaper but have more joints, and joints are the weak point, as explained below.

Does timber last by a pool?

Yes, if species and installation are right. By water, tropical woods such as ipé are used, along with thermally modified ash and teak. They are dense, do not rot quickly and heat less than stone in the sun. Composite boards of wood flour and polymer do not splinter and need no oil, but they fade.

Upkeep. Ipé and teak are either oiled once a year or left to turn grey, in which case the board ages protectively. Under the deck there must be ventilation, with joists on pads: standing moisture eats timber from beneath. Chlorinated splashes and salt water shorten life, and a well-kept hardwood deck lasts ten to twenty years.

Drawbacks: splinters from a poorly sanded board, slipperiness when wet, stains from furniture. For children and maintenance-free surfaces choose stone or porcelain and keep timber for the terrace and sunbathing area.

How to deal with the overflow edge, joints and drainage?

The edge and the drain decide how the whole deck works. At an overflow pool a collection channel with a grating of the same tile or stainless steel runs beside the edge, and the floor falls gently towards it. At a pool with skimmers the edges are finished with a rounded coping tile. The change of level is resolved in advance: a step of 1–2 cm is felt by the foot.

The deck falls 1–2% from the pool and the house towards drainage gratings, or water stands in puddles that become a hygiene problem in summer. Joints are filled with epoxy grout: cement grout breaks down in salt and chlorinated water. Movement joints go round the perimeter, at walls and every few metres, and are filled with elastic sealant.

All metal parts by the water are 316 stainless, fixings included: ordinary steel rusts and leaves orange streaks on pale stone. The order of works is covered in our article on the stages of pool construction.

Where to start and how BCN YARD can help

With samples on the plot: lay three or four options in the sun, wet them and walk across barefoot. Then choose the slip class from the document, draw the falls and drainage and only then order the material. The deck and the pool shell are designed together.

BCN YARD builds houses with pools and gardens turnkey. We run the site in Russian and Spanish, with our own crew and trusted subcontractors, and one person responsible. The exact price comes in the estimate after a visit and measurements, with payment under contract in stages.