Steam at Home: The Inverted Tray Method

February 6, 2026

556

By Hendrik Kleinwächter

Great bread, no new gear.

Baking begins when you load your dough into the oven, after bulk fermentation and proofing. From that moment on, rising heat decides the final volume, crust and flavor of your bread. Many bakers think they need expensive steam ovens or heavy Dutch ovens to get professional results, but that isn’t true.

This guide explains what happens to dough in the oven, why steam is essential in the first stage of the bake, and how to use the inverted tray method: a simple, scalable way to create a bakery-style steaming environment in a typical home oven using tools you likely already have.

What happens to dough in the oven

As the temperature rises, your dough passes through several stages. Water and acids start to evaporate, the gas bubbles in a gluten-based dough expand, and the loaf rises vertically in oven spring. At the same time, the surface turns into a gel-like crust that is still extensible and can stretch as the loaf grows.

You can think of the process in temperature bands:

Around 60 °C / 140 °F – Sterilization

The temperature becomes too hot for the microorganisms in the dough and they die.

Around 75 °C / 167 °F – Gel Building

The surface turns into a gel that holds the dough’s structure. It is still extensible and can spring in the oven. This gel is essential for oven spring because it keeps the gas inside the dough.

Around 100 °C / 212 °F – Water Evaporation

Water starts to evaporate out of the dough and inflates the alveoli. Without this step, the bread would taste soggy and doughy. Higher-hydration doughs keep more water even after the bake, so the crumb feels moister.

Around 118 °C / 244 °F – Acetic Acid Evaporation

The vinegary-tasting acetic acid starts to evaporate and sourness decreases.

Around 122 °C / 252 °F – Lactic Acid Evaporation

The dairy-tasting lactic acid begins to evaporate and sourness decreases further. As water evaporates, the acids first become more concentrated. A shorter bake therefore leads to a tangier bread. With a longer bake, water and acids both leave the loaf, and the bread becomes less sour.

Around 140 °C / 284 °F – Maillard Reaction

Starches and proteins deform, the crust thickens and the dough starts to brown.

Around 170 °C / 338 °F – Caramelization

Remaining sugars begin to caramelize, giving the bread a distinct flavor and a darker color. You can keep baking to build exactly the crust color you prefer.

The most reliable way to know that the crumb is baked is to measure the internal temperature with a barbecue thermometer. Once the core reaches about 92 °C / 197 °F, you can stop the bake. In practice, bakers often continue a little longer to develop more crust. The thermometer is especially helpful with larger loaf pans, where it is hard to judge from the outside whether the center is done.

Once the bake is finished, the dough has become bread. At this point, the bread is effectively sterile because the temperature was too high for the microorganisms to survive.

Why steam matters in the first stage

Steam is essential in the early bake because it counters premature crust formation.

During the first stage, the dough increases in size as water inside it evaporates and pushes the dough upwards. In a dry, hot oven, the crust would form quickly, similar to vegetables turning darker and crisper when roasted. For bread, you want to delay this crust building as long as possible, until the dough no longer expands.

Steam condenses and evaporates on top of the dough, quickly raising the surface temperature to around 75 °C / 167 °F. At this temperature the gel forms, which is still extensible and allows further expansion. Without steam, the dough would not stay in this gel stage. It would move directly into the Maillard reaction zone and start browning too early. Keeping the dough in the gel stage as long as possible is what allows maximum oven spring.

You can see steam problems on the finished loaf:

Too little steam or too much heat: The scoring cuts do not open properly and stay mostly closed, and large pockets of air collect near the crust as the dough tries to rise against a firm skin.
Too much steam for too long: The crust stays soft and the loaf never fully enters the Maillard and caramelization stages, so it does not brown and thicken.

For this reason, steam is used only in the first part of the bake. Once the dough has finished expanding, the steam source is removed so you can focus on building crust. If you prefer a very soft crust, it is possible to steam for the whole bake.

Matching steam to your oven

Most home ovens are designed to vent steam and are not fully closed. This is ideal when roasting and drying food, but problematic for making bread, when you want as much steam as possible during the first stage.

Depending on the oven, different steaming methods work best:

Gas ovens – Use a Dutch oven.
Convection ovens with a fan that cannot be disabled – Also use a Dutch oven.
Convection ovens where the fan can be turned off – Use either a Dutch oven or the cost-efficient inverted tray method.
Steam ovens – Use the steam function and optionally place an additional tray over the dough to bake with indirect heat. This helps the loaf remain in the gel zone longer and improves oven spring.

Dutch ovens in practice

A Dutch oven is an ideal way to bake with a lot of steam. It is not fully sealed, but as water evaporates from the dough, it creates a steamy environment that lets the loaf rise more, with better oven spring and a fluffier crumb.

Typically, the dough is baked covered for the first half of the bake, then uncovered for the second half. The desired crust darkness and thickness are a matter of preference.

In practice:

Preheat the Dutch oven properly so the dough does not stick.
Use semolina or parchment paper as an extra layer, if needed.
You can spritz the dough with a bit of water and place a small ice cube next to it to create more steam.

There are also downsides. Dutch ovens are heavy and can be dangerous to move when they are very hot, so heat-resistant gloves are important. Many models are expensive, and capacity is limited because most home ovens can only fit one Dutch oven, meaning you can only bake one loaf at a time. For these reasons, the inverted tray method is an attractive alternative.

The inverted tray method: scalable steam for home ovens

The inverted tray method simulates a Dutch oven, but scales better for a home oven. Place another tray above the dough, so the steam created by the dough and a small water source stays around the loaves.

The main advantage over a Dutch oven is capacity: it is possible to bake multiple loaves at the same time; for example, two free-standing loaves and four in loaf pans.

You will need:

2 trays
1 heat-resistant bowl
Boiling water
Oven gloves
(Optional) parchment paper

A practical sequence looks like this:

Preheat the oven to around 230°C (446°F) and preheat one of the trays.
Bring water to a boil.
Place your loaves on parchment (or sprinkle semolina on the tray if you do not use parchment).
Take the hot tray out of the oven, place it on a heat-resistant surface, score the doughs, and load them onto the tray.
Put the second tray into the oven in an inverted position above where the loaves will sit, then return the hot tray with the loaves to the oven underneath it.
Put the boiling water into the heat-resistant bowl (adding lava rocks or sauna stones is optional to increase surface area) and close the oven.
After about 30 minutes, remove the top tray and the bowl with water, then continue baking until you reach your desired crust color, usually in another 15–25 minutes.

This method gives you steam in the first stage and a drier environment in the second stage.

A simple baking roadmap

In practice, you can think of baking in two stages: a steam stage, in which the loaf heats up, the gel forms on the surface, and the dough expands; and a dry stage, in which steam is removed, the crust thickens, browns, and caramelizes until it reaches the color and flavor you like.

Use a thermometer to check that the center reaches around 92 °C / 197 °F so the crumb is baked through. Then continue a little longer if you want a darker crust.

With a good steaming setup and the inverted tray method, a home oven can produce loaves with strong oven spring and the crust you want.

A software engineer by design, Hendrik Kleinwächter is a sourdough nerd at heart. His book The Sourdough Framework democratizes the art of breadmaking by showing that you don’t need expensive equipment to make great bread. Check out his Youtube channel: www.youtube.com/@the_bread_code

(This article appeared in the Winter 30 issue of Pastry Arts Magazine)