Floor Temperature vs Dome Temperature in a Pizza Oven

An oven can show one number at the dome and a very different one at the floor, and both can be right. They measure different things in different places.

What each number describes

The dome reading is usually the air or the dome surface near the top of the chamber. The floor reading is the surface of the cooking stone or brick that the pizza sits on. A wood-fired oven is generally built with a circular cooking floor, and a dome above it that is shaped to keep heat from escaping¹. So the floor and the dome are two separate parts, and they heat up at different speeds.

The source describes wood-fired ovens this way, with a cooking floor under a dome. A hybrid oven is one that can use both wood and gas as a fuel¹. Other oven shapes may differ, so check your own manual for how your oven is built and where each reading is taken.

Why the floor lags behind

Heavy material takes a long time to warm and a long time to cool. Thermal mass is the mass of the material times the specific heat capacity of that material². A thick stone floor has a lot of it. Thin air in the chamber has very little.

That's why the dome number often jumps early, while the floor lags behind. A fire can push the air in the dome to a high figure in minutes. The stone below is still soaking up heat. Put a pizza on it too soon and the base can bake slowly while the top cooks fast.

Which number matters for the bake

Each part of the pizza gets its heat from a different source.

• The base touches the floor. Floor surface temperature drives how the underside cooks.
• The top and rim take heat from the flame, the hot air and the dome surface above.
• The floor has to hold its heat as pizzas are launched, so a floor that has only just reached its number may drop quickly.

For a beginner, the floor reading is the one to learn first, because it tells you about the part you can't see once the pizza is on it. The dome reading still helps. It shows how the top of the chamber is doing and whether the fire needs feeding or the burner needs adjusting.

How the thermometer affects the number

An infrared thermometer, often called a gun, infers temperature from a portion of the thermal radiation coming off the object³. It reads a surface. It doesn't read the air. So a gun pointed at the floor gives a surface figure for the floor, and the same gun pointed at the dome gives a surface figure for the dome.

A built-in gauge is a different tool and often sits in a different place. Where its sensor sits decides what it reports. See Built-in Dome Gauges and Probes for what those readings usually represent.

The red dot on a gun can mislead too. The area that is actually measured varies among instruments and isn't limited to the visible spot³. Where to Aim covers how to choose a spot and a distance.

A simple way to compare the two

Follow these steps once and write the numbers down. Use your own manual for the safe way to light and run the oven.

1. Light the oven as your manual says, outdoors and in the open, never in a garage or closed space.
2. Take a dome reading at a fixed point, using the method your manual describes.
3. Take a floor reading with a gun at a fixed spot in the middle of the floor.
4. Repeat at regular gaps as the oven warms.
5. Note when the two numbers move closer together.

After a few sessions you'll see a pattern for your own oven. The gap between dome and floor tends to shrink as the stone catches up. Your notes then show roughly how long your floor needs before it's ready.

What to carry forward

Treat the two numbers as a pair rather than as rivals. The dome number says what the chamber is doing now. The floor number says what the base of the pizza will meet. If they disagree, wait, check how each was taken, and read your manual's own wording on which reading it asks you to use.

To understand what a gun really sees, read How an Infrared Thermometer Reads a Pizza Oven Floor.