Travertine Floors in Marin: Cleaning, Filling and Sealing

Travertine is one of the most common stones in Marin entries, bathrooms, and kitchens, and one of the most misunderstood. People clean it like tile, and it is not tile. It is a soft, calcium-based stone with holes in it, and both of those facts decide how it should be cleaned, what it should never touch, and what a professional cleaning can and cannot do for it.

Our natural stone guide covers travertine alongside marble, limestone, slate, and granite. This post goes further into travertine on its own.

What travertine is, and why acids etch it

Travertine belongs to the limestone family. It forms from mineral springs, where calcium carbonate settles out of the water in layers, and gas bubbles and plant matter caught in those layers leave the voids that give it its texture.

Calcium carbonate reacts with acid. When an acidic liquid sits on travertine, it dissolves a thin layer of the surface and leaves a mark that is duller and usually lighter than the stone around it. That mark is called etching. It is not a stain sitting in the stone. It is a change to the stone itself, which is why no cleaner removes it.

The usual sources in a house:

• Kitchen: wine, citrus juice, tomato sauce, vinegar, soda, and coffee.
• Bathroom: toothpaste, mouthwash, perfume, and most scale and soap-scum removers.
• Cleaning cupboard: vinegar-based “natural” cleaners and many general-purpose sprays.

A sealer does not prevent etching. It slows how fast liquids soak into the stone, but an acid still reaches the surface through it. Sealing is worth doing for other reasons, which sealed vs. unsealed stone explains, but it is not a shield against lemon juice.

Filled and unfilled travertine

Those natural voids are the other thing that makes travertine different.

Filled travertine. Most indoor travertine tile has its holes filled at the factory, usually with a cement-based or resin filler close to the color of the stone, and is then honed or polished flat. Fill is a different material from the stone around it. Over years of traffic, some of it can crack, shrink, or pop out, and an open pit appears where there was a smooth surface. Those pits catch grit and mopping water and turn dark.

Unfilled travertine. Tumbled tile and many outdoor pavers are left with their holes open. That is part of the look, and it is normal. It also means the floor has far more places for soil to settle than a flat filled floor does.

Either way, a mop does not clean a hole. It moves dirty water across the surface, and the water settles into the low points as it dries. That is why travertine often looks grey in the traffic lanes and in the pits even when it has just been mopped.

Honed, polished, and tumbled finishes

The same stone wears very differently depending on its finish.

Polished travertine is glossy and shows everything. Each etch is a dull spot against the shine, and fine scratches from grit show up in raking light. It looks the most formal and is the least forgiving.

Honed travertine is flat and matte. Etching is still there, but it reads as a patch that is slightly rougher or a slightly different tone rather than a dull spot, and you often feel it before you see it. Honed is the most common finish on Marin floors because it hides daily wear better than polished.

Tumbled travertine has softened edges and a worn, textured surface. It hides etching and scratches best of the three. The trade is that its texture and open holes hold the most soil.

Knowing which finish you have tells you what you are looking at when the floor starts to look tired.

Daily care for travertine floors

The care routine is simple. Most travertine damage we see comes from doing something extra rather than from doing too little.

• Dust mop or vacuum first. Dry grit is abrasive and scratches the surface when it is dragged around. Get it up before any water goes down.
• Use a neutral-pH cleaner made for stone. Dilute it as directed and use a well-wrung mop or microfiber pad, so water does not sit in the holes.
• No vinegar, bleach, ammonia, or general-purpose sprays. Vinegar etches the stone. All of them strip sealers.
• Nothing abrasive. Scouring powders and pads scratch honed and polished travertine.
• Wipe spills promptly, especially wine, citrus, and oils. Use coasters and trays on travertine counters and vanities.
• Mats at entries. They trap grit before it reaches the stone.
• Squeegee shower travertine after use, so minerals and soap are not left to build up. The acidic removers sold for soap scum will etch it.

Professional cleaning and resealing

When the traffic lanes have gone grey and the holes have gone dark, it is past what a mop can do.

We clean travertine with truck-mounted hot water extraction and neutral-pH products, adjusting pressure and dwell time to the stone. The hot rinse flushes soil out of the pores, the holes, and the grout joints, and the extraction pulls it out of the house rather than leaving it to dry back in place. On travertine, the holes and joints are usually where the most visible difference comes from.

Then we seal. A clean, dry floor is the only state in which a penetrating sealer goes in properly, which is why we recommend resealing every time we clean. Sealer applied over soil locks the soil in. The grout gets the same treatment, and grout sealing covers what that does and does not do.

Most travertine floors need cleaning and resealing every two to three years. Entries, kitchens, and coastal or damp houses sit toward the shorter end. In Sausalito, travertine entries take salt and grit off the street, and in bay-front Tiburon and Belvedere homes, entry stone takes grit and water marks while waterfront humidity keeps grout damp. The water-drop test is the quickest check: put a few drops on a traffic lane, wait five minutes, and if the stone darkens, the sealer is no longer working.

When travertine needs more than cleaning

Cleaning removes soil. It does not change the shape or finish of the stone. These are the cases where it will not get you where you want to be on its own:

• Fill that has popped out. Cleaning will empty the pits of soil, so they look cleaner, but they are still holes. Re-filling them is repair work and a separate job from cleaning.
• Etched or dull patches. An etch is a change to the surface, so it needs restoring mechanically rather than cleaning. A dark mark is more likely soil or a stain, which cleaning can often lift. The etching vs. staining distinction is worth learning before you buy anything to treat it.
• A worn finish across the floor. Polished travertine that has gone matte in the traffic lanes has lost its polish, not its cleanliness.
• Cracked or loose tiles. That is a tile setter’s job.

None of this is a reason to put off cleaning. It is a reason to know what to expect. At the estimate we will look at the floor and tell you honestly which of these we see, and whether cleaning and resealing will give you the result you are after.

What to do next

Look at your travertine in daylight. Note whether the problem marks are dull or dark, whether the holes are open, and whether the traffic lanes look grey next to the edges of the room. Then text us a few photos, or run the water-drop test and send us what happens.

More on the surfaces we clean and seal is on our stone, tile and grout page. Or ask for a free estimate.