Lime plaster for bathrooms, specified as a complete system.
Tadelakt is a traditional Moroccan lime plaster, compressed and polished with a stone and treated with soap to make the surface water repellent. It was the traditional finish of hammams and palace bathrooms in Morocco. Halston Builders builds tadelakt bathrooms and lime plaster showers as part of our bathroom renovation work, with the substrate, waterproofing and vapor control specified for the chosen plaster system.
- Shower and wet-room walls, built-in benches and niches
- Tub surrounds and vanity walls
- Steam showers, where the plaster system is approved for steam
- Powder rooms and other walls away from direct water
- Samples, care and maintenance discussed before you commit
What tadelakt is and how it goes on
Tadelakt is made with lime rather than cement, and products vary: one manufacturer's mix lists hydraulic lime, quartz sand, marble powder and clay. The plaster goes on in thin coats over a prepared base and, while damp but firm, is compressed and burnished with a smooth stone or trowel. It is then treated with diluted olive oil soap, which reacts with the lime to form insoluble calcium soaps at the surface. Some systems add a wax coat once the soap has cured.
The result is a continuous surface without grout joints that can follow curves, benches and niches. Because it is handwork, tone and sheen vary, and the plaster darkens when wet and lightens as it dries. See real samples before deciding.
Where it works and where it does not
Tadelakt is water repellent, not waterproof. Manufacturers that approve it for showers require a waterproofing membrane rated for wet areas behind it, so a hairline crack cannot let water reach the structure. Approvals vary: one maker rates its tadelakt for showers and steam showers over a steam-rated substrate, while another excludes showers, basins and tubs. We confirm the product's written approvals for the exact use, and the assembly behind it must meet the building code that applies, such as the Connecticut State Building Code.
A few limits hold across most systems:
- Shower floors: manufacturer guidance generally advises against them, because standing water and foot traffic stain and wear the plaster. Stone or tile underfoot is the usual pairing.
- Steam: tadelakt is breathable and is not a vapor barrier, so a steam shower needs its own vapor control and an enclosure designed for steam.
- Movement: the base has to be stable and rated for wet use, because movement behind the plaster shows up as cracks.
- Skill: ask to see the applicator's finished wet areas and agree on a sample panel first.
A plaster bathroom still needs ventilation. The EPA's guide to mold and moisture recommends running the bathroom fan or opening a window when showering.
Care and maintenance
Tadelakt asks more of its owners than glazed tile. After showering, rinse with warm water and squeegee or wipe the walls dry. Clean with a mild, pH-neutral soap and a soft cloth. Avoid vinegar and other acidic cleaners, bleach, ammonia and abrasive pads, which etch the lime or strip its protective layer.
That protection needs renewing on a schedule set by the product. One manufacturer calls for re-soaping wet areas every one to two months; another calls for a coat of wax at least once a year in showers. Hairline cracks can often be repaired with the original plaster and resealed, though a repair may show.
Tadelakt suits people who value visible handwork and a surface that develops a patina, and who will follow its cleaning rules. If you want uniformity with minimal upkeep, or the budget would force shortcuts behind the plaster, a well-built tiled shower is the better choice.
Where we build tadelakt bathrooms
Our work covers Fairfield County and Westchester County. Our town pages describe the houses and local approvals in Greenwich, New Canaan, Westport, Darien, Rowayton and Rye.
Related reading
Our journal explains what tadelakt is and compares tadelakt, tile and microcement for a steam shower. For a step-free entry, read about curbless showers in older houses. The Book-Matched Bath is a design study, not built work, that includes a plaster wet-room concept.
Questions about tadelakt bathrooms
Is tadelakt waterproof?
No. Tadelakt is water repellent: the soap treatment makes water bead and run off, but the plaster is not a waterproofing layer. In a shower it goes over a waterproofing membrane rated for wet areas, specified for the chosen plaster system.
Can tadelakt be used in a steam shower?
Some systems are approved for steam and some are not, so the answer starts with the product. Where steam is approved, the plaster goes over a steam-rated substrate with its own vapor control, because tadelakt is not a vapor barrier. Steam is decided at the start, since it changes the wall and ceiling assembly.
Can the shower floor be tadelakt?
Manufacturer guidance generally advises against it. Standing water, soap residue and foot traffic stain and wear the surface, and a floor would need frequent resealing. Stone or tile on the floor with plaster on the walls is the usual combination.
How do you clean a tadelakt shower?
Rinse with warm water after use and squeegee or wipe it dry. For regular cleaning, use a mild pH-neutral soap and a soft cloth. Never use vinegar, acidic descalers, bleach or abrasive pads.
Does tadelakt cost more than tile?
There is no universal ranking by cost. The price depends on the plaster system, the waterproofing and vapor control behind it, the applicator, samples and curing time. We compare whole installed scopes for plaster and tile rather than finish prices alone.
Is tadelakt a good choice for a family bathroom?
It can be, if the household will follow the cleaning rules and is happy with a surface that marks over time. For a heavily used children's bath, glazed tile is often easier to live with.
Start with a free consultation
Bring photos of finishes you like and tell us how the bathroom is used. We can meet at the house or at our Bridgeport design center, by appointment. Request a free consultation.
