Travertine Tiles: Filled or Unfilled, and How to Seal Them

Travertine tiles are the natural stone we get asked about most in Bromley, usually by someone who has fallen for a honed cream floor in a showroom and wants to know whether it will survive a family kitchen. It can, but travertine behaves differently from porcelain in almost every way that matters after the tiler has gone home: it is porous, it reacts to acid, it is heavy, and its finish decides how much looking after it needs. Choose the right version and it will outlast the house. Choose the wrong one for the room and you will be fighting etch marks within a month.

This covers what travertine actually is, the finishes and how they wear, filled against unfilled, where it works and where it does not, how it should be fixed, and the sealing routine that keeps it looking right.

What travertine is, and why it has holes

Travertine is a form of limestone laid down by mineral-rich spring water. As the water gives up its calcium carbonate, gas bubbles and plant matter get trapped in the deposit, and those leave the pits and voids that make travertine recognisable. Most of the travertine sold in the UK is quarried in Turkey, with smaller amounts from Iran, Mexico and Italy. Italian stone tends to be paler and more even; Turkish stone runs from near-white through walnut and gold to red, often in a single batch.

Two things follow from that chemistry. First, it is soft compared with porcelain or granite, so it scratches and its edges chip more easily. Second, calcium carbonate dissolves in acid. Wine, vinegar, lemon juice, tomato, fizzy drinks and most bathroom descalers will leave a dull, pale mark called an etch. Sealer does not stop etching, because the acid attacks the stone itself rather than soaking in.

Travertine finishes: honed, tumbled, brushed and polished

The same block of stone can be finished four ways, and the finish matters more to daily life than the colour.

Pale travertine cladding with long horizontal striped veining across square panels — Pale travertine with the long parallel striping typical of a vein cut, used as wall cladding on a modern building. | free texture, travertine stone, modern architecture, seier+seier by seier+seier (CC BY 2.0), via Flickr, https://www.flickr.com/photos/94852245@N00/4356821425

Honed: ground flat to a smooth, matt surface. The most popular choice for floors because it has reasonable grip and hides wear. Etch marks show less on honed than on polished, since there is no shine to lose.
Tumbled: the tiles are tumbled with grit so the edges round off and the face looks aged. Rustic, forgiving of scuffs, and usually sold unfilled.
Brushed: wire-brushed to a slightly textured, leathery surface. A middle ground between honed and tumbled, and a good pick for a bathroom floor where you want some grip.
Polished: buffed to a gloss. It looks sharp on a wall, but it shows every scratch and etch and it is slippery when wet, so we steer people away from it on bathroom and kitchen floors.

You will also see vein cut and cross cut. Vein cut slices across the layers of the deposit, giving long parallel stripes; cross cut slices along them, giving a cloudier, more random pattern. Vein cut looks more contemporary and suits large format and linear layouts.

Filled or unfilled travertine tiles

Because the stone is full of voids, most honed and polished travertine is filled at the factory with a cementitious filler or resin before the final finishing pass. Tumbled stone is usually left unfilled. The difference is not just looks.

Filled travertine gives a smooth, closed surface that is easy to mop and does not catch dirt. Over years of foot traffic some of the factory fill can work loose and a few pits reopen; that is normal and a tiler can refill them with a matching grout or resin.

Unfilled travertine keeps the open pores. It looks more natural, but the holes collect crumbs, soap scum and grout. If you want unfilled stone, decide before fixing whether the pits will be filled with grout at the grouting stage or left open. Left open on a floor, they will fill with dirt instead.

Where travertine works, and where it does not

Living rooms, hallways and conservatories are travertine’s best territory. Honed and filled stone on a properly prepared floor ages well and suits both period houses and modern extensions.

Kitchens are fine on the floor, with a caveat: anything acidic dropped and left will etch. Wipe spills straight away and accept that the floor will pick up a patina. We would not use travertine as a worktop or splashback behind a hob where tomato and citrus splash every day.

Bathrooms work well on floors and walls outside the shower, in honed or brushed finish, filled, and sealed. Inside a shower enclosure the stone is wet for long periods and exposed to shampoos and limescale removers, so it needs resealing often and gives up its looks faster. If you love it, use it on the walls and floor around the shower and put a porcelain in the enclosure itself. Never use acidic descalers on it.

Outdoors is possible, but in a Kent winter the risk is frost. Water gets into the pores, freezes and expands, and surfaces can spall. If you want travertine on a patio, buy thicker paving specifically sold for external use, lay it on a proper bed with drainage fall, and seal it. For most gardens around Bromley, an outdoor porcelain is the lower maintenance choice.

Underfloor heating is fine under travertine. Stone conducts heat well. The same rules apply as for any tiled floor on UFH: commission the system and run it before tiling, then bring it back up gradually. Our page on tiling over underfloor heating covers the sequence.

How travertine tiles should be fixed

Most fixing failures we see on natural stone come down to three mistakes: the wrong wall background, the wrong adhesive colour, and grouting before sealing.

Check the weight against the wall

Travertine weighs roughly 2.3 to 2.7 tonnes per cubic metre, which puts a 12mm tile at around 28 to 32kg per square metre before any adhesive. The Tile Association’s guidance limits a plastered wall to about 20kg per square metre of tile and adhesive, and plasterboard without a skim to about 32kg. So a 12mm travertine wall tile is too heavy for a plastered wall and at or over the limit for bare plasterboard. On walls we fix travertine to cement board. Our comparison of tile backer board against plasterboard explains the options.

Use a white, flexible, rapid-set adhesive

Grey adhesive can show through pale, translucent stone as dark patches, and slow-setting adhesive holds moisture against the back of the tile long enough to cause staining. Use a white adhesive sold for natural stone, ideally rapid-setting and flexible (an S1 classification) on floors, and get full solid bed coverage so there are no voids under the tile for a heel or chair leg to crack.

Seal before you grout

Grout pigment will stain unsealed travertine, especially unfilled or tumbled tiles. Apply a coat of impregnating sealer after fixing and before grouting, let it cure, grout, then apply the final coats. We go through this step in detail in sealing natural stone tiles before grouting. Pick a grout colour close to the stone; a contrasting grout on a busy travertine makes the floor look like a grid.

Sealing and cleaning travertine tiles

Use a penetrating, impregnating sealer made for natural stone, not a topical coating that sits on the surface and wears into paths. Two coats is normal, applied with a brush or lint-free cloth and any excess wiped off before it dries, since sealer left on the surface goes sticky and hazy.

How often to reseal depends on the product and the room, so test rather than guessing. Put a few drops of water on a clean, dry tile in a busy spot. If the water beads and sits there for more than half a minute, the sealer is doing its job. If the stone darkens and soaks it up, it is time to reseal. In a shower room that can be once a year; in a lounge it may be several years.

Day to day:

Sweep or vacuum first. Grit is what wears a honed finish dull.
Mop with water or a pH-neutral stone cleaner. Never vinegar, lemon, bleach or anything sold as a limescale remover.
Blot spills rather than wiping them across the stone, and do it straight away.
Put mats at external doors and felt pads under chair legs.

If a floor is already etched, a professional stone restorer can re-hone it back to an even finish.

Is travertine right for your room?

Pick travertine if you want real stone, you are happy to seal it, and the room is not constantly wet or acid-splashed. Pick a travertine-effect porcelain if you want the look with no sealing and no etching, which is often the better answer for a family bathroom or a busy kitchen. We compare the two material families in porcelain against ceramic tiles, and the Tile Association publishes guidance for anyone wanting the industry detail on backgrounds and fixing.

If you are weighing up travertine for a floor or bathroom in Bromley or south east London, Bromley Tilers can look at the room, check the subfloor or wall, and tell you honestly whether stone or porcelain will serve it better.

Frequently asked questions

Do travertine tiles need sealing?

Yes. Travertine is porous and will absorb oil, grout pigment and dirty water. Seal once after fixing and before grouting, again after grouting, and then whenever a water drop test shows the stone darkening and absorbing water.

Can you use travertine tiles in a shower?

You can, but we do not recommend it inside the enclosure. Constant water, shampoo and descalers wear the sealer and the finish quickly. Travertine on the bathroom floor and walls outside the shower, with porcelain inside it, gives the look with far less upkeep.

What is the difference between filled and unfilled travertine?

Filled travertine has its natural holes packed with a cement or resin filler at the factory, giving a smooth surface that is easy to clean. Unfilled keeps the open pores, which look more natural but collect dirt unless they are filled with grout during fixing.

Why has my travertine got dull marks that will not clean off?

Those are almost always etch marks from something acidic, such as wine, citrus, vinegar or a limescale cleaner. The acid has dissolved the surface of the stone, so no cleaner will remove them. A stone restorer can re-hone the area.

Can travertine go on a plasterboard wall?

Usually not safely. A 12mm travertine tile weighs around 28 to 32kg per square metre before adhesive, which is at or above the Tile Association’s 32kg limit for bare plasterboard. Fix it to cement backer board instead.

Is travertine good with underfloor heating?

Yes. Stone conducts heat well and travertine is a common choice over wet and electric underfloor heating. Run and commission the system before tiling and follow the adhesive maker’s guidance on curing before switching it back on.

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contact@bromleytilers.co.uk