What is cob made out of?
Cob is made out of three ingredients: clay, sand, and straw. Clay and sand are to be found underneath the first few inches of topsoil, almost anywhere. Straw is simply grass that has been dried out. All three of these are easily procured for little or no money. The three ingredients are mixed with water, either by humans, animals, tools, or machinery. Once the water evaporates and the cob dries out, it is rock solid, and makes an incredibly strong wall.
