Apply clay only as a finishing coat

Complete ohm cleaning is not always technically feasible. Damp substrates and efflorescence prevent durability. In order to use at least some of the positive properties of a clay wall, a combination of materials can be the solution. In addition, there is a possibly required mold control, which clay does not offer.

Similarities and differences between lime and clay

Clay plaster and lime plaster are mineral plasters that have several properties in common. They are open to diffusion and can absorb and release humidity. Both purify the air as dirt particles are "trapped".

  • Also read - Applying clay plaster to existing gypsum plaster
  • Also Read - Applying Clay Plaster to Tiles
  • Also read - clay plaster: guide

One of the differences between plasters is their hardness. A clay plaster is softer than a lime plaster and must therefore always be applied as a finishing plaster. If lime plaster is applied as a harder finishing coat, cracking is almost unavoidable. Due to its alkalinity, lime kills organic dirt such as germs and spores. Clay can get moldy.

Clay plaster and other materials

In some structures, moisture in the masonry cannot be prevented. Basements and some external walls are often affected by rising water and the salts associated with it. Clay plaster does not hold up under these conditions. Laying a concealed plaster made of lime solves the problem.

The three common types of interior plaster are compatible with clay plaster as follows:

  • Lime plaster can easily be combined with clay plaster, but must be roughened so that the clay plaster holds
  • Clay plaster on gypsum plaster does not hold up and the two materials "don't get along"
  • Lime cement plaster can be covered with clay plaster to a limited extent. It depends on the proportionate mixing ratio

In any case, the base plaster must be completely dry before the top plaster made of clay is applied. The construction height of the plaster should not exceed that of the plaster. Ten to 15 millimeters for each layer is ideal.

Since clay plaster can be mixed with a thin liquid, it can also be used as a roll plaster. So it can also be rolled up directly as a single-layer finish on tiles and plasterboard.

Tips & Tricks So that the clay can show off its air conditioning properties, you should give it a minimum thickness of ten millimeters. You should expect a drying time of around 24 hours per millimeter.