Clay, sand and straw is mixed by foot on a tarp or with a cement mixer for faster results. Clay acts as the glue, sand hardens the structure, and the straw works like rebar to give the walls strength.
Cob is Mixed into a dough like consistency, and then placed into walls up to two foot thick and worked in to create a monolithic wall structure. No forms are used, and the builder can create it into any shape.
