Marble and travertine are both calcium carbonate stones, both etch with acid, and both are carved the same way — the real difference is porosity. The Natural Stone Institute's Dimension Stone Design Manual (2022) sets marble's recommended maximum water absorption at 0.20% by weight and travertine's at 2.5%: a ceiling 12.5 times higher. Almost every practical difference between the two in a bathroom follows from that one number.
We carve both and are not trying to talk anyone out of either. But the two stones fail in different ways and suit different rooms, so here is the comparison with the figures attached.
The numbers, side by side
Both sets of values come from the same source — the Natural Stone Institute's Dimension Stone Design Manual, 2022 edition, chapters 7 and 12 — measured under the same ASTM test methods.
| Property (ASTM test) | Marble | Travertine |
|---|---|---|
| Water absorption, % by weight (C97) | 0.060–1.0 — recommended max 0.20 | 0.10–2.5 — recommended max 2.5 |
| Density, lb/ft³ (C97) | 140–185 — min 162 (calcite) | 140–165 — min 144 |
| Compressive strength, psi (C170) | 6,000–35,000 — min 7,500 | 5,000–10,500 — min 5,000 interior |
| Modulus of rupture, psi (C99) | 1,000–4,000 — min 1,000 | 500–1,500 — min 700 interior |
| Abrasion resistance, Ha (C241/C1353) | 5.0–50.0 — min 10 | 7–25 — min 10 |
Read the ranges, not just the headlines. The weakest marble and the strongest travertine overlap, so variety matters more than category — which is why the Institute advises designing to test data for the specific stone being installed rather than to the group average.
What "porous" actually means in a bathroom
Travertine is a chemical sedimentary limestone precipitated around mineral springs, and the Natural Stone Institute describes it as "very porous, often cavernous on a scale of inches." Those voids are gas-bubble and dissolution cavities trapped as the rock formed. They are the look people buy travertine for, and they are also the maintenance question.
Two fabrication decisions change how much of that porosity you live with:
- Vein cut vs. fleuri cut. Vein cut runs against the bedding planes and reads as straight linear banding; fleuri (cross) cut runs parallel to them and gives the open, flowery pattern. The Institute notes fleuri-cut surfaces can open new holes over time where thin cavity walls sit just below the finished face.
- Filled or unfilled. Voids are commonly filled with tinted portland cement or epoxy resin. NSI guidance: holes larger than 2 cm, or any hole passing through the stone, should be filled with a travertine chip cemented below the surface — not just skimmed.
Marble has no equivalent structure. Testing of sixteen domestic marble varieties at the Illinois Institute of Technology Research Institute found absorption below 1% by weight for every sample, against 4–12% for other common masonry materials.
Both stones etch. Neither is acid-proof.
Marble and travertine are both calcareous — calcite, CaCO₃ — and calcite reacts with acid. The Natural Stone Institute is blunt about it: calcite effervesces in dilute hydrochloric acid, and dissolves without visible bubbling in weaker acidic liquids such as red wine and salad vinegar. A lemon slice left on either stone leaves a dull mark.
The maximum allowable absorption for marble in showers and wet areas is 0.20% by weight; the same specification allows 0.40% for granite, 1% for quartzite and up to 3% for Group 3 limestone. Marble sits at the tight end of that list — which is why it is specified for wet areas at all, and why acid-type cleaners are expressly prohibited on it. Use pH-neutral cleaners on both stones; we cover the detail in our guide to natural stone basins.
Strength: why it changes how we carve
The figure that matters most for a basin is not compressive strength — a sink is never crushed — but modulus of rupture, the bending strength. Marble runs 1,000–4,000 psi; travertine 500–1,500 psi. A travertine basin is working with roughly half to a third of the bending capacity of a comparable marble one.
That is not a reason to avoid travertine — it is a reason to detail it differently: thicker bowl walls, a more generous apron section, more caution with long unsupported spans. Anisotropy compounds it, since travertine's two cut directions test differently, so the cut has to be specified rather than assumed. A travertine basin and a marble one of the same external size are not the same object internally.
Weight is closer than people expect: at 140–165 lb/ft³ travertine is only modestly lighter than marble. Neither hangs on plasterboard alone; both need blocking or a rated bracket system, which is the first thing we ask about on a wall-mounted basin.
Colour, and how each one ages
Travertine's palette comes from iron oxides: light buff through tan and brown into reds — a warm, quiet stone that reads as texture from across a room. Marble's interest is veining: the grey-on-white of Carrara, the burgundy of Calacatta Viola, the near-black of Nero Marquina.
Both develop a patina, and honed surfaces hide it far better than polished ones — which is why we hone almost everything we carve for a bathroom.
Cost, and where the money actually goes
In the 2025 U.S. Houzz Bathroom Trends Study of 1,737 homeowners, the median spend on a major bathroom remodel was $22,000, with the top 10% of projects reaching $60,000. Sinks were upgraded in 73% of renovations and countertops in 76% — but marble accounted for only 8% of bathroom flooring choices, behind porcelain at 39% and ceramic at 26%. Stone in most American bathrooms is a focal-point material, and a carved basin is exactly that kind of purchase.
Between the two stones, block cost drives the difference more than labour. Travertine blocks are generally less expensive; marble with dramatic veining costs more because the veining has to be positioned, which means cutting around the block rather than through it. Carving hours are broadly similar.
How we'd choose
Travertine if you want warmth and texture — a powder room, a guest bath, or a travertine tub where the tactile surface is the point. Marble if you want the veining to be the event, or the basin sees heavy daily use and a tighter, less absorbent surface is worth the extra care.
What we would not do is choose either on the promise that it is low-maintenance. Both are calcite, both etch, and both want a pH-neutral cleaner and a periodic impregnating sealer — travertine more often, because of that absorption figure at the top of this page.
Send us the dimensions of your room and we will tell you which stone we would cut it from and why. Start a custom order, or read the broader marble sink guide first.
Frequently asked questions
Is travertine more porous than marble?
Yes, substantially. The Natural Stone Institute's Dimension Stone Design Manual (2022) gives marble a water absorption range of 0.060–1.0% by weight with a recommended maximum of 0.20%, and travertine a range of 0.10–2.5% with a recommended maximum of 2.5% — a ceiling 12.5 times higher. Travertine also carries visible voids from its formation, which marble does not.
Does marble or travertine stain more easily in a bathroom?
Travertine, on the numbers, because a more absorbent stone gives liquids more opportunity to enter. Both are calcite and both etch on contact with acids — the Natural Stone Institute notes that calcite dissolves in liquids as mild as red wine and vinegar. Sealing helps with staining but does not prevent etching on either stone.
Which is stronger for a carved sink, marble or travertine?
Marble, in bending — the property that matters for a basin. Modulus of rupture (ASTM C99) runs 1,000–4,000 psi for marble and 500–1,500 psi for travertine. Compressive strength shows the same pattern: 6,000–35,000 psi against 5,000–10,500 psi. We compensate by detailing travertine basins with thicker walls rather than by avoiding the stone.
Do travertine sinks need to be filled?
Usually, yes. Natural Stone Institute guidance is that holes larger than 2 cm in diameter, and any hole passing through the stone, should be filled — with a travertine chip cemented below the surface rather than a surface skim. Tinted portland cement and epoxy or polyester resin are the standard fillers.
