Deck ovens are so called because the items to be baked either on sheet pans or in the case of some breads, freestanding are placed directly on the bottom or deck of the oven. There are no racks for holding pans in deck ovens. Deck ovens are also called stack ovens because several may be stacked on top of one another. Also called “hearth deck ovens”, stone deck ovens are defined by their stone-lined ceilings and their use of a hot pizza stone or deck. This pizza stone could be made out of stone or ceramic, and come in different thicknesses.