Apply clay only as a finishing coat

Not always a Komplehmhmputz is technically feasible. Moist surfaces and efflorescence prevent the durability. In order to at least partially utilize the positive properties of a clay wall, a combination of materials may be the solution. There is also a possibly required mold brake that does not offer clay.

Correspondences and differences of lime and clay

Clay plaster and lime plaster are mineral plasters that share some properties. They are vapor-permeable and can absorb and release atmospheric moisture. Both clean the air, because dirt particles are "captured".

To the differences of the plasters belongs the hardness. A clay plaster is softer than a lime plaster and must therefore always be applied as a top coat. If lime plaster is applied as a harder finishing coat, tearing is almost unavoidable. Lime kills organic dirt such as germs and spores through its alkalinity. Clay can mold.

Clay plaster and other materials

In some buildings, moisture in the masonry can not be prevented. Often cellars and some outer walls are affected by rising water and associated salts. Clay plaster does not last under these conditions. The installation of a concealed lime solves the problem.

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

  • Lime plaster can be easily combined with clay plaster, but must be roughened, so that the clay plaster finds support
  • Clay plaster on gypsum plaster does not last and the two materials "do not tolerate each other"
  • Lime cement plaster can be conditionally covered with loam plaster. It depends on the proportionate mixing ratios

In any case, the flush must be dried before the top coat of clay is applied. The installation height of the top coat should not exceed that of the concealed plaster. Ten to 15 millimeters for each layer are ideal.

Since loam plaster can be mixed with liquid, it can also be processed as a rolling plaster. It can also be rolled up directly onto a tile or plasterboard as a single-layer finishing coat.

Tips & Tricks

In order for the clay to be able to exploit its room-conditioning properties, you should give it a minimum thickness of ten millimeters. Per millimeter you have to expect a drying time of about 24 hours.

Artikelbild: Anton_Medvedev / Shutterstock

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