Clay plaster: Guidebook

Clay plaster has excellent physical properties. It is water-soluble, which allows it to be processed, regulates humidity through absorption and release, stores heat and compensates for temperature differences. In addition, you get a decorative wall covering especially in the interior of your home.

Clay plaster is kneadable when wet

The material clay behaves differently than plaster from cement, gypsum and sand. The clay content makes the clay plaster in the watered condition ready to throw, so that it is thrown on the masonry and similar to the lime plaster is removed flat. With the easy drying on and hardening the clay plaster hardens and develops a kneadable consistency. At this stage, plastic interventions in the surface shape of the clay plaster are possible, for example, to create bulbous or curved contours and structures. In the dried and cured state, the clay plaster forms a rigid sheet, which has little tolerance to movements in the masonry.

It depends on the mix

Loam can be divided into lean and fat loam. The richer the clay plaster, the higher the clay content. By enriching with sand, the clay plaster becomes leaner. The behavior of clay plaster depends very much on the environment in which it is used. There is no universal mixture and therefore the right mixture has to be determined with tests on site. If the clay plaster is too fat, it dissolves completely from the ground or gets cracks. In these cases, dosed sand must be added and a new test plaster must be performed. To lean clay plaster is to be seen in the replacement of smaller parts in contrast bumping or knocking.

Natural additives change the properties

The clay plaster can be well adapted to special requirements by adding natural materials. To increase the binding force, plant starch or elongated fiber material such as hair, straw or flax are added. In order to increase the hardness of clay plaster, admixtures of concrete, cement or rock flour are suitable. The resistance and resistance to moisture is enhanced by the addition of cow dung, skimmed quark and other protein-containing dairy products or limestone lime. For the additional protection of the surfaces, a coating with lime paint or a mixture of linseed oil with limestones and proteins is suitable. In clay plaster, less industrial than manual standards are crucial and your clay plaster is always unique.

Video Board: Sculpting in Oil Clay