Care & Installation
Cleaning Travertine: What Works, and What Permanently Damages It
Travertine is calcium carbonate. That single fact predicts almost everything about how it must be cleaned — including which everyday products will etch it on first contact.
There is one fact about travertine that answers most cleaning questions before they are asked: it is calcium carbonate. Marble is calcium carbonate. Limestone is calcium carbonate. Anything acidic reacts with all three, and travertine’s open pore structure means the reaction is not only on the surface — it draws the liquid in before the acid has finished working.
The rule that prevents almost all damage
Use pH-neutral products. Not “products suitable for natural stone” — many of those are mildly acidic despite the label. Read the pH. If a cleaner does not state its pH, treat it as a risk.
Specifically, the things that etch travertine on contact and cannot be repaired:
- Vinegar and vinegar-based cleaners, including many standard kitchen degreasers
- Lemon juice and citrus-based products
- Acidic bathroom sprays and scale removers
- Some grout cleaners and cement residue removers
- Most “natural stone” cleaners that do not state a pH
Etching is a dull, matte spot where the polish was. On honed material it may be polished out with diamond pads; on a polished surface it is a permanent loss of gloss that only re-polishing restores, and re-polishing means taking the piece back down a grade. This is why the response to an acid spill is immediate and specific: blot, do not wipe. Wiping spreads the spill across a larger area of the face.
Everyday routine
Sweep or vacuum daily. Do not use a vacuum with a beater bar on a honed travertine floor — the wheels and the bar leave scratches that sealer will not hide. Doormats inside the entrance do more for a travertine floor than any product.
Mop weekly with warm water and a pH-neutral stone soap, then rinse and dry. Standing water is what leaves mineral deposits, so the mop should not leave a film behind. For heavier work — grease, soap scum, biological growth — use an alkaline stone degreaser made for natural stone, with dwell time, and rinse thoroughly.
When to seal, and how often
Sealing is not optional for travertine; unfilled travertine is commonly published at 3-8% water absorption by weight. A penetrating sealer fills the microscopic pores without leaving a film, and it is the barrier between a spill and the stone.
The interval depends on traffic and on position, and published guidance from stone care manufacturers and installer documentation broadly converges on resealing every 1-3 years for interiors and annually for outdoor work, where UV and weather break the sealer down faster. The number is less important than the test, which takes ten seconds: put a few drops of water on the surface. If it beads, the sealer is intact. If it soaks in and the stone darkens, it is time.
Two sealer types and they are not interchangeable in effect: a penetrating sealer leaves the appearance alone, while an enhancing sealer deliberately darkens the stone and gives it a permanent wet look. On a project where several batches arrive from different blocks, enhancing sealer is how a floor ends up patchy. Penetrating is the safer default.
Outdoor, and the things that arrive on stone
Mould and algae on outdoor travertine need a biocidal stone cleaner, dwell time, and thorough rinsing. Pressure washing at full power dislodges grout and can damage the face — this is documented installer guidance rather than a preference. Where an outdoor floor has blackened with algae, the sealer underneath is usually fine and only needs reapplying after cleaning.
Two rules worth repeating
Blot, do not wipe. On a spill, and always.
Do not seal over an unclean surface. Sealer applied over moisture or residue penetrates poorly and traps whatever was underneath. Most installer documentation is explicit that the stone must be clean and completely dry, with 24-48 hours of drying time before application.
Sources: sealing intervals and cleaner chemistry as published by stone care product manufacturers and installer documentation; pH guidance consistent across the same. Absorption figure is the published range for unfilled travertine, not a test result for any individual lot.
Questions this article answers
Which country does my travertine come from?
We buy from seven: Turkey, Iran, Italy, Spain, Mexico, Pakistan and China, and they are not variants of one product. Turkish and Iranian material is strongly bedded and openly porous, which is what takes the classic vein-cut face. Italian and Spanish material is pale and fine-pored enough to take a high polish. Pakistani material is widely traded under this name and is mostly reef limestone, a different rock entirely. Chinese material covers several provinces that differ from each other as much as the countries do. They saw at different rates and take different fillers, so a quote that names no origin cannot be compared with another quote. We state the origin before we state a price, and we cut and finish all of it at our own base.
How is your travertine graded?
On what actually varies in the material rather than on a colour name. The grading question for travertine is how open the voids are, how deep they run, how regular they are, and whether the tone holds across the lot -- plus, where it matters, which producing region it came from and whether it is filled. A colour name carries none of that information, which is why two lots sold under the same name can arrive as visibly different stone.
Filed under Care & Installation
