The production of clay plaster requires little primary energy, the basic material clay is abundant practically everywhere in Germany. Clay plasters are free of harmful substances, skin-friendly and have the ability to absorb vapours, smoke and pollutants. In addition to the mineral base material, aggregates include cellulose fibres, sand, straw, chaff, wood chips or sawdust. Clay plaster contributes to a positive indoor climate due to its ability to absorb moisture and release it again with a time delay, thus reducing the risk of mould even in domestic kitchens and bathrooms.
A disadvantage of clay plaster is its easy solubility in water, so it is unsuitable in areas exposed to splashing water, which can then be carried out with lime-cement plaster and tiles, for example. At a permanent humidity of > 70%, clay plaster becomes susceptible to mould infestation. The building physics properties of layers underneath a clay plaster are completely preserved. In addition, clay plaster is not suitable for heavily used surfaces and for frequently changing wallpapering. Subsequent treatment with natural wax makes it more resistant and also conditionally wipeable. There are also special clay plasters with carbon fibres, which, in conjunction with a deflector plate and the connection to an equipotential bond, can significantly reduce high-frequency radiation and dissipate alternating electric fields. Clay plasters can be carried out in one or more colours.
Clay plaster must dry out quickly to prevent mold growth. For this reason, mechanical construction drying may be necessary in the case of unfavourable natural drying conditions, layer thicknesses of more than 15 mm or poorly absorbent substrates.
Source: bauwion
