Clay, silt and sand are prepared moist, plastic to a mixture for wall or ceiling plaster.
DEVELOPMENT: Loam is a mixture of clay, sand, silt (very fine sand) and, under certain circumstances, stones. It is mainly formed by weathering, erosion and sedimentation of rocks. Clay is therefore available almost everywhere in the world in different colours and compositions.
HISTORY: Along with wood and stones, clay is one of the oldest building materials of mankind. Even today, more than a third of the world's population lives in buildings that were built partly or entirely of clay, using various techniques. Even in Central Europe, centuries-old buildings still consist of clay, although the building material was mostly used by poorer societies and almost completely displaced with the advent of cement and lime.
Photos: Philip Heckhausen