Advantages of Adobe bricks. Adobe walls have a number of advantages and relatively few disadvantages. As with other forms of earth construction, adobe bricks are a fireproof, durable yet biodegradable, non-toxic building material which provide sufficient thermal mass to buildings to ensure excellent thermal performance.An adobe brick is a composite material made of earth mixed with water and an organic material such as straw or dung. The soil composition typically contains sand, silt and clay. Typically the soils of the Southwest United States, where such construction is in use, are an adequate composition.What they did have was dirt, rock, and straw and, with these materials, they made their adobe houses in communities called pueblos. Adobe is mud and straw mixed together and dried to make a strong brick-like material. Pueblo peoples stacked these bricks to make the walls of the house.Adobe bricks (mud bricks) are made of earth with a fairly high clay content and straw. If produced manually the earth mix is cast in open moulds onto the ground and then left to dry out. Adobe bricks are only sun-dried, not kiln-fired. When used for construction they are laid up into a wall using an earth mortar.Mix dry sand & sifted clay together first, then add water and start stomping. Use the tarp to roll drier mix on top of the wetter mix, keep stomping, and continue adding water until the cob is sticky but stiff. It should look uniform and should roll into a “cob burrito” when the tarp is pulled.Cob, cobb or clom (in Wales) is a natural building material made from subsoil, water, fibrous organic material (typically straw), and sometimes lime. The contents of subsoil naturally vary, and if it does not contain the right mixture it can be modified with sand or clay.