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Undercoat plaster is – as the term suggests – the clay plaster that is applied directly to the existing wall. Old or uneven masonry is leveled with a base coat, level compensation layers are made for interior insulation, ​Wandheizungsflächen are filled or fabric is plastered in. It is processed with plastering machines or by hand. An unercoat plaster is usually applied in layers up to 3 cm thick. In the case of crooked or curved walls, it is sometimes necessary to work with several layers of undercoat plaster. Once the first layer has set, the next layer can be applied. This is repeated until the wall is leveled and even enough for finishing plaster. The ​Armierungsgewebe s then embedded in the top layer..

Especially with many layers or thick layers, it is essential to ensure good drying. Clay plaster must dry quickly so that the chopped straw does not start to mold. Old construction site dust and dirt from the subsoil can also start to mold. Drying with a lot of wind or alternatively with building heating or ​Bautrockner s particularly recommended if so much clay is installed at once with a plastering machine that the total moisture input into the building is considerable. When plastering wall heating, a base plaster made of clay is always used for the first layer. This first layer should be applied up to the upper edge of the heating pipes. The fabric layer is only applied after the surface has dried or been tightened. Please do not try to rationalize these two work steps: Due to the varying degrees of shrinkage on and between the pipes during drying, the plaster can become wavy, which can ultimately even be visible in the ​Lehm-Oberputz . A clay topcoat is usually applied to a clay base coat. A homogeneous wall design is created that has a regulating effect on the humidity, cleans the room air and gives you a fantastic living climate.