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The soil is wetted and made into a thick clay mixed with chopped stubble and straw from harvested wheat. The clay is hand-formed to make the dome-shaped shell. It is about 76 centimetres (30 in) to 101 centimetres (40 in) in diameter at its base, about 38 centimetres (15 in) to 51 centimetres (20 in) high, with an open top, approximately 38 ...
"Puddle" is a general term for a clay or clay and sand-based material worked into a dense, plastic state. [21] These are the oldest methods of building with adobe in the Americas until holes in the ground were used as forms, and later wooden forms used to make individual bricks were introduced by the Spanish.
To make a seed ball, generally about five measures of red clay by volume are combined with one measure of seeds. The balls are formed between 10 mm and 80 mm (about 1 ⁄ 2 " to 3") in diameter. After the seed balls have been formed, they must dry for 24–48 hours before use.
The clay percentage may be reduced by adding sand, if available. [21] If there is more than 15% clay it may take more than 10% cement to stabilize the soil, which adds to the cost. [20] If earth contains little clay and holds 10% or more cement, it is in effect concrete.
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Grog, temper for clay. Grog, also known as firesand and chamotte, is a raw material usually made from crushed and ground potsherds, reintroduced into crude clay to temper it before making ceramic ware. It has a high percentage of silica and alumina. It is normally available as a powder or chippings, and is an important ingredient in Coade stone.
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Building a wall out of cob. Cob, cobb, or clom (in Wales) is a natural building material made from subsoil, water, fibrous organic material (typically straw), and sometimes lime. [1] The contents of subsoil vary, and if it does not contain the right mixture, it can be modified with sand or clay.