The layers of a pizza oven
1. Foundation and stand
A level, solid base — typically a reinforced concrete slab with a block or brick stand — carries the considerable weight of the oven.
2. Insulated hearth
A layer of insulation under the cooking floor stops heat draining down into the stand. It is commonly made with vermiculite or perlite mixed with cement, or insulating board or blanket.
Oven insulation3. Cooking floor
Fire bricks laid flat (often in a herringbone or running-bond pattern) on a thin bed of fine material, or a cast refractory slab. This is the surface the pizza bakes on.
Floor & hearth materials4. Dome or walls
Fire bricks bonded with refractory mortar, or refractory castable cast over a former. The dome absorbs heat from the fire and radiates it back onto the pizza.
Dome, walls & bonding5. Dome insulation
Ceramic fibre blanket or other insulation wrapped over the dome keeps heat in the oven and the outside cooler. Without it, an oven loses heat and burns more fuel.
Ceramic fibre blanket6. Door, seal and finish
The door opening, flue connection and outer enclosure or render complete the oven. A ceramic fibre rope seal helps the door close tightly.
Door seals & finishing
Curing a new or repaired oven
Even when an oven looks dry, its mortar, castable and concrete still hold water. If the first fires are too hot, that water turns to steam inside the masonry and can cause hairline cracks or worse.
The usual approach is to let the finished oven stand for several days, then light a series of small fires that get progressively larger and hotter over about a week, so the moisture leaves slowly. Oven and material makers publish their own schedules — for example these step-by-step oven curing instructions and this illustrated cure and re-cure guide — but always follow the one for your own oven.
Repaired ovens need curing too: new mortar, castable or patching cement contains water that must be driven out gradually.
How hot pizza ovens run
For authentic Neapolitan pizza, the Associazione Verace Pizza Napoletana (AVPN) describes a wood-fired oven with a floor of roughly 380–430 °C and a dome around 485 °C, baking each pizza in about 60–90 seconds — figures oven maker Alfa Forni also explains in its guide to the ideal temperature for Neapolitan pizza. Other styles bake cooler and longer.
That is why the hot face of an oven is built from refractory materials, and why the insulation layers matter: they let the floor and dome store heat for pizza after pizza.
Pizza oven questions
What materials do I need to build a pizza oven?
A typical masonry pizza oven uses fire bricks or refractory castable for the floor and dome, refractory mortar for the joints, insulation under the floor (for example vermiculite or perlite concrete) and over the dome (for example ceramic fibre blanket), and a door seal.
Why does a new pizza oven need curing?
Mortar, castable and concrete still hold water after building. Small fires that grow gradually over several days drive that moisture out slowly; very hot early fires can turn it to steam and crack the oven.
How hot does a pizza oven get?
For Neapolitan-style pizza, the AVPN describes a floor of about 380–430 °C and a dome around 485 °C, baking a pizza in roughly 60–90 seconds. Other pizza styles bake at lower temperatures.
Can ordinary cement or bricks be used in a pizza oven?
Not for the hot parts of the oven. Ordinary bricks and cement are not made for repeated high-temperature heating and cooling; refractory materials are used where the oven gets hot.