A pizza oven requires a sufficient brick base and insulation beneath it. A sand mold is used to build up the clay dome of the oven, and then the oven needs about three weeks to dry. A roof is recommended to prevent the oven from crumbling over time.
The base of the fireplace must be placed upon a concrete slab. Three or four layers of bricks may be laid to create the base of the oven, and lintels must be placed over the top to support the center of the insulation and the oven. Fire bricks are laid over these lintels, and then bricks must be laid about the edges of the fire bricks to create a space for insulation beneath the oven floor. Recommended insulating materials include wine bottles and sawdust, but clay works as well. The oven floor is then laid on top of these materials.
A frame of sand covered with a tarp is then laid on top of the oven floor. A mixture of clay and sand is built up around this frame to create the roof, and a 1:1 ratio of sand to clay is appropriate. The frame should be at least 16 inches in height to make a good-sized oven space. After laying clay over the frame, it can be detailed using a trowel. After this, the sand is removed, and the clay is left to dry for three weeks. A simple roof is recommended to prevent erosion of the oven.