Clay is one of the major materials used in building pizza oven. A Clay oven is that which is made with clay and sand + or – straw. However, those with straw are known to as cob ovens. The difference with the other forms of pizza ovens is that cement is not used in clay ovens. Apart from the requirements needed in building a clay oven, the procedure of building a clay oven remains the same for building the typical brick pizza oven.
Further information: Clay oven and How to build a pizza oven