Clay is one of the oldest building materials on earth, along with stone and wood. Over half of the world's population still live or work in a building made with clay as an essential part of its load-bearing structure. Clay is a common ingredient in many natural building techniques - adobe, cob, cordwood, and rammed earth structures and building elements such as wattle and daub, clay plaster, clay render case, clay floors and clay paints and ceramic building material.
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