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Consisting mainly of clay, sand and possibly straw, they are a 100% renewable product and contain no harmful substances. Compared to other wall coverings, they are less toxic and energy-intensive, as little energy is required in extraction, production and processing, making them attractive to environmentally conscious people.
The materials common to many types of natural building are clay and sand. When mixed with water and, usually, straw or another fiber, the mixture may form cob or adobe (clay blocks). Other materials commonly used in natural building are: earth (as rammed earth or earth bag ), wood ( cordwood or timber frame /post-and-beam), straw , rice-hulls ...
Either moist subsoil that contains enough clay to become cohesive when tamped, or a water-resistant angular gravel or crushed volcanic rock is used. Walls are gradually built up by laying the bags in courses—forming a staggered pattern similar to bricklaying. The walls can be curved or straight, domed with earth or topped with conventional roofs.
An earthen floor. An earthen floor, also called an adobe floor, is a floor made of dirt, raw earth, or other unworked ground materials. It is usually constructed, in modern times, with a mixture of sand, finely chopped straw and clay, mixed to a thickened consistency and spread with a trowel on a sub-surface such as concrete.
A compressed earth block (CEB), also known as a pressed earth block or a compressed soil block, is a building material made primarily from an appropriate mix of fairly dry inorganic subsoil, non-expansive clay, sand, and aggregate. Forming compressed earth blocks requires dampening, mechanically pressing at high pressure, and then drying the ...
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"Cob stitch" repair on old traditional cob cottage in Devon, England Maison de Jeanne, Sévérac-le-Château.Timber and cob construction. Cob is an English term attested to around the year 1600 [3] for an ancient building material that has been used for building since prehistoric times.
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