Travertine Bathtub — Carved From a Single Block

A travertine bathtub carved from one block is the centerpiece of the organic-modern bathroom: tons of warm, honey-toned stone hollowed by hand into a freestanding tub. Marbly Design produces solid travertine and marble tubs to order, with engineering support and insured white-glove delivery worldwide.

The Roman-spa association is literal: the Natural Stone Institute traces the name to the Italian travertino, from the ancient Roman town of Tibur (now Tivoli), where travertine formed around volcanic hot springs and has been quarried for centuries. The thermal feel follows from mass — NSI publishes travertine density at 140–165 lb/ft³ (2,240–2,640 kg/m³) under ASTM C97, so every 0.1 m³ of stone left in the tub wall carries 224–264 kg of heat-holding material. Each tub begins as a 5–10 ton block; we confirm interior profile, dimensions and drain position on a technical drawing before cutting.

Tub projects include crate engineering, freight coordination and placement guidance for your contractor. Finished weights run 400–1,200+ kg, and that range is arithmetic rather than an estimate: multiply the stone volume left after hollowing by the ASTM C97 density above. A 170 cm tub retaining about 0.25 m³ of travertine lands near 560–660 kg empty, and roughly 1,000 kg (2,200 lb) filled and occupied — a point load your structural engineer should see before the floor is closed up. We supply the exact figures for the piece you order.

Travertine's other governing number is porosity. NSI puts absorption at 0.10–2.5% by weight (ASTM C97) and compressive strength at 5,000–10,500 psi (ASTM C170), which is why voids are filled and the tub is sealed rather than left raw. NSI's guidance is that holes larger than 2 cm across, or holes passing through the stone, should be filled with a cemented travertine chip. And it is candid about what you are buying: "Travertine is a product of nature and not always subject to the rules of consistent behavior that may apply to manufactured building materials," states the Natural Stone Institute's Dimension Stone Design Manual, which also advises that a travertine "should never be made on the basis of one sample only." We photograph your actual block for that reason.

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Frequently Asked Questions

How much does a travertine bathtub cost?

Solid travertine tubs are project pieces, typically from around $8,000 depending on size and finish, with insured freight quoted for your address.

Is travertine suitable for a bathtub?

Yes. Filled and sealed travertine handles bathing well, and it is the original bath stone — the Natural Stone Institute traces its name to Tibur (Tivoli) near Rome, where it precipitated around hot springs. Its ASTM C97 absorption range of 0.10–2.5% by weight is why filling and sealing matter, and its 140–165 lb/ft³ density is why the water stays warm.

How long does a custom tub take?

Plan 6–10 weeks of carving plus freight; we confirm an exact schedule with your drawing and quote.

Will my bathroom floor hold a travertine bathtub?

Usually, but check first. A carved travertine tub weighs 400–1,200+ kg empty at NSI's published 140–165 lb/ft³, and a mid-size tub filled and occupied approaches 1,000 kg (2,200 lb) concentrated over a small footprint. On a concrete slab that is rarely an issue; on suspended timber joists it needs a structural engineer's sign-off, and sometimes blocking or a spreader. We issue the exact finished weight with your drawing so that review happens before installation, not after.