Tadelakt or Tadellakt is a glossy, waterproof plaster near the lime can be used indoors and outdoors. It is the traditional coating of the palaces, steam rooms and bathrooms of the riads in Morocco. Its traditional application includes being polished with a river stone and treated with a mild soap to acquire its final appearance and water resistance. Tadelakt has a luxurious, soft aspect with undulations due to the work of craftsmen who eventually, in some installations, it is suitable for the manufacture of bathtubs, showers, washbasins and confers great building and decoration. Traditionally, tadelakt is produced with the lime in the region of Marrakech.
The restoration of the riads of Morocco drew attention to this ancient technique.

Tadelakt more generally refers to a lime plaster applied in accordance with principles and techniques of tadelakt Moroccan, but using the organs of lime in places other than Marrakesh.

Materials and techniques definition
The basic characteristics of a tadelakt are: 1) It is a lime plaster. It does not include Portland cement. 2) It may be of marble or limestone sand, but no other aggregates. 3) It has been compressed when the plastic, which eliminates all voids. 4) It was mechanically polished with stones and abrasives are harder than the finish plaster to provide a smooth, sometimes glossy, finish. 5) He was treated with a natural soap (often "black or olive oil soap) to the rate of carbonation of the surface and make the surface more resistant to water.