A mold is used to shape pre-cast pizza oven dome and vent pieces using castable material, such as Refractory Castable. The advantage of molds over ovens make using cut brick is that molds are easily be designed to the shape the user wants, such as a low dome Naples pizza oven. Another advantage of molds is that they can be make multiple pre-cast oven pieces of the same size, shape and dimension.

Pre-cast oven kit producers use mold made of steel and fiberglass.