Steam — and the hammam this continent already owns

The tank, and the junctions that fail

Liquid membrane over the slab and up the walls past the ceiling junction, taped and detailed at every corner. Screed falling at least 1:50 to the drain. Ceiling pitched three to five degrees or gently domed so condensate runs to the walls instead of onto people.

The failures are always at junctions — where the membrane meets an existing block wall, a door frame, a bench support, a light fitting or a steam outlet. Those take time and they get rushed. In Stone Town, a Marrakech riad or an old Creole townhouse in Victoria the walls are also absorbent, which makes that detailing most of the skill and most of the cost.

Ventilation is the design, not a fan

Mechanical extract, ducted to outside, sized for several air changes after a session and controlled by a humidistat rather than a timer. A timer cannot know how wet the outside air is on a given afternoon in Lagos or on Zanzibar, and a fan that stops with the room still wet is how a steam room starts growing things.

Extract that terminates in a ceiling void is the single most common fault we find in existing installations on this continent, and it is worse than no extract at all: it takes saturated air and injects it into the structure where nobody can see what it does.

The hammam, where it belongs

In Morocco and Egypt the room becomes a hammam: warm humid air at 40–50 °C with the real heat stored in a slab held at 40–45 °C that guests lie on. Sessions run an hour and it is social in a way a sauna is not.

It is the most expensive of the three rooms, the heaviest and the one that makes the strongest impression. It also uses a vocabulary — tadelakt, zellige, alabaster, a heated central slab — that belongs here rather than being imported, and we buy that work from craftspeople who do it for a living and name them.

Water, before the generator is chosen

Supply across our markets runs from municipal to borehole to rainwater, and the chemistry varies between neighbourhoods and sometimes between houses on a street. Hard water scales a generator in months; rainwater is soft and kind to it but aggressive to some tank materials.

So we test at the property first. The result sets the descaling interval in your service schedule, and where the water is genuinely hard we specify softening on the feed — cheaper than the alternative over any reasonable life.

In short

• Continuous membrane detailed into absorbent coral, lime and old blockwork
• Humidistat extract ducted genuinely outside — never into a ceiling void
• Hammam with a heated slab where the building tradition supports it
• Water tested at the property before the generator is specified