Turkish Bath Construction: The Heated Marble Slab, Steam and Ventilation

Sauna Dekor. We design, manufacture and install Turkish baths and hammams for five-star hotels, resorts, wellness centres and private residences in the UAE, Saudi Arabia, Qatar and across 41+ countries, from our own factory in İkitelli OSB, İstanbul, in business since 1987 and now in its fortieth year. Our scope covers the tanked shell, the göbek taşı and its heating, the domed or vaulted ceiling, marble and mosaic finishes, steam and hot-water plant, kurna basins, drainage and commissioning.

Last updated: 6 November 2026

A Turkish bath, or hammam, is a heated, humid bathing room built around a large heated marble platform. Bathers warm on the stone, are exfoliated with a coarse kese mitt, and are then washed with soap foam. The air sits at roughly 40–45 °C with 60–80 per cent humidity, and a full ritual runs 60 to 90 minutes rather than the 10 to 20 minutes of a steam room session.

The göbek taşı, literally belly stone, is the large heated marble platform at the centre of the hot room. It is heated from below by a hypocaust system, the same underfloor principle the Romans used, and its surface sits at roughly 38–42 °C. It is the defining element of an authentic Turkish bath, and it is the element that hybrid steam-room hammams most often leave out.

A Turkish bath works by radiant heat from a heated marble platform in a humid, domed chamber; a steam room works by convective heat from a generator filling a sealed cabin with saturated vapour. Air temperature is similar at 40–45 °C, but humidity is 60–80 per cent against 100 per cent, the architecture is different, and the session length is different — 60 to 90 attended minutes against 10 to 20 unattended ones.

In a thermal suite a hammam or steam room typically occupies 4–12 m² each, and ceiling height matters as much as floor area because the dome, the vault and the services above it all need depth. A room built around a full göbek taşı needs enough clear space for bathers to lie on the stone and for an attendant to work around it, which sets a practical lower limit well above a domestic steam cabin.

A Turkish bath is a warm, humid room rather than a hot, saturated one: air in the high thirties to low forties Celsius with relative humidity held well below saturation, and most of the heat arriving by radiation from the heated floor, benches and göbek taşı rather than from the air. That is what makes a long session possible, and it is also why the heating is hydronic and embedded rather than an appliance standing in the corner.

Yes, and it is the most common combined brief, but the shared partition carries a 40 °C temperature gradient and a humidity difference from 10–20 % to near saturation. The vapour barrier faces the hammam, the sauna side stays dry and timber-lined, and the two build systems meet at a drawn junction. Plant for both sits outside the rooms in an adjacent, accessible space.

A hammam bathroom is a finishes package — marble, zellige or Iznik tile and a kurna basin — in a room that is not heated or drained as a wet thermal chamber. A Turkish bath is a heated room with a göbek taşı or heated bench, hydronic loops, steam plant outside the room and continuous falls to a gully. A hammam shower sits between the two: tanked and graded, but not held at temperature.

Survey, then tanking signed off before it is covered, then the shell, benches, göbek taşı plinth and vaulted ceiling, then hydronic heating and plant with manifolds outside the wet room, then marble and mosaic set to the established falls, then commissioning under load. Each stage buries the one before it, so the order is fixed.

A Turkish bath in a private home takes 3–8 weeks to build; a large project takes up to 12 weeks. A hotel thermal suite containing a hammam runs longer, because approvals, waterproofing sign-off and MEP coordination sit on the critical path rather than the marble.