Ask Paul: Why are my baking pans warping? (2024)

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Heat warps pans, and that’s nothing to worry about unless it’s impacting your baking. If that’s the case, I know a great place you can buy some pans.

Back to the question. Sheet pans are most prone to buckle due to the uneven expansion of the surfaces of the pan. Most sheet pans have turned-up continuous edges all around, so you have multiple surfaces, all expanding in the heat, with the greater the length the greater the amount of expansion.

The bottom of the sheet pan, being the longest of all, is trying to expand in an area that is restricted by the folded-up edges, resulting in the bottom buckling as it seeks to expand.

The loud popping sometimes heard in the oven is the pan suddenly giving in to the stress of the expansion. Once the pan is completely hot, the buckling will go away as the rest of pan catches up in expansion. The same thing can happen in reverse as the pan is moved into a much cooler area after baking.

Additionally, widely spaced food on a baking sheet creates varying temperatures across the metal, with some spots under the food shielded from heat and others fully exposed. These differences cause different contractions or expansions, which can cause buckling. This is inherent in the design of the pan and its heating method and no guarantee of freedom from this problem can be made.

However, this phenomenon is usually temporary and reversible, but sometimes these stresses are greater than the strength of the material, especially in thinner metal, which causes the pan to be permanently buckled or “warped.” Getting thicker pans helps some because the bottom becomes stronger and can begin to dominate the edge strength, but this alters the cooking.

If the oven has different top and bottom heat, or the pan is placed higher or lower in the oven, this will also alter the heat input, sometimes increasing and sometime reducing the difference, and can either make the buckling worse, or be used to reduce it.

A pan with only one folded edge does not suffer this condition, but now liquids cannot be contained.

So there you go. Pans can and will warp, especially sheet pans. Don’t worry unless it’s impacting baking. If it is, give us a call at 800-748-6251 or email us at sales@lloydpans.com.

Purchase your baking pans online today!

Ask Paul: Why are my baking pans warping? (2024)

FAQs

Ask Paul: Why are my baking pans warping? ›

Sheet pans are most prone to buckle due to the uneven expansion of the surfaces of the pan. Most sheet pans have turned-up continuous edges all around, so you have multiple surfaces, all expanding in the heat, with the greater the length the greater the amount of expansion.

Why do my baking pans warp? ›

It is the natural result of the metal expanding and contracting unevenly across the pan as it heats during cooking and then cools down. Most pans will spring back into place when the hotter and cooler spots equalize, but they can remain warped if the thermal stress is too great.

How do I stop my pans from warping? ›

So protect your pan from warping by following this practical advice:
  1. Tip 1. Steer clear of that ice-cold tap and put your pan down on a trivet or cool hob to cool down gradually after using.
  2. Tip 2. Avoid turning the heat on your hob straight to the highest setting. ...
  3. Tip 3.
Feb 27, 2024

Why do metal pans warp? ›

The metal expands as it heats. The large surface of your sheet pan will heat and expand faster than the short rimmed sides. This creates stress right where the flat base meets the raised lip, causing some pans to buckle or twist.

What does warped pans mean? ›

A warped pan is distorted, often by overheating, so that it no longer sits flat on the burner. It's not particularly dangerous. It just doesn't heat evenly which is kind of annoying. Thinner pans tend to warp more easily than heavy pans. Whether you can fix it depends on the metal it is made of.

Why do aluminum pans warp? ›

The pan is overheated.

Once you place a piping hot frying pan on a back burner or take a fiery sheet pan out of the oven, you're exposing it to a huge temperature change. Sometimes, the difference between the hot pan and the room-temperature air is enough to cause warping.

Do cheap pans warp? ›

Warping is the result of metal expansion at different rates, caused by uneven heating. It usually happens with thin metal pans, often cheaply made ones.

Why do my pans not stay flat? ›

Make sure you are allowing your pan to heat gradually on a lower heat. If you heat your pan too quickly and on a high heat, it can also cause your pan to heat unevenly, and therefore not flatten out in the way it is designed to.

How do you keep a stainless steel pan from warping? ›

For many people, the immediate reaction may be to rinse your pan off immediately after cooking, but a hot pan should never be immersed in cold water. The temperature shock can cause permanent warping. "Always allow the pan to cool prior to cleaning," says Wendy Dyer, international product director at All-Clad.

Is there a frying pan that doesn't warp? ›

Cast iron skillets can be heated to insane temperatures without warping, whether on the stovetop, in the oven, under the broiler, on an outdoor grill, in a campfire, or some combination of these. Yes, it is called cast iron.

Is it safe to use a warped pan? ›

Not only does this make the pan wobbly, but Dean Harper, founder at Harper Fine Dining, notes it "can damage the pan's heat retention, distribution and absorption." While there's no serious danger to using a warped pan, it's best to avoid it as it prevents food from heating thoroughly on the stove or in the oven.

How do you restore a baking pan? ›

You can also use baking soda with hydrogen peroxide: Sprinkle baking soda in an even layer directly onto your sheet pan, then spray it with hydrogen peroxide until damp. If you let the mixture sit for two hours, you'll still need to put in some labor—but leave it overnight and scrubbing won't really be necessary.

Are aluminum baking sheets safe? ›

Many people wonder if this type of bakeware is safe to use. While aluminum itself is considered safe for food contact, there are concerns about the potential for aluminum leaching into food, especially when cooking acidic or alkaline ingredients.

How do you deglaze a pan without warping? ›

For instance, if you deglaze a pan with tepid or room-temperature wine, that's fine. But if the liquids are cold or chilled, then they have a higher probability of warping the pan. When it comes to washing, we suggest letting pans cool briefly and then using tepid water to wash them.

Does hot water warp pans? ›

The right way to wash hot pots and pans

Let them cool completely to room temperature before you wash them, Julia says. When you allow your cookware to cool down in its own time, you prevent the risk of warping or breaking.

Why do pans warp on glass top stove? ›

If you have a flat top stove, cookware may warp due to heating too quickly. If the pan is larger than the burner, the edges of the pan overhang the burners. Due to the direct heat of the flat top stoves, the center of the pan will tend to heat more quickly than the edges, which can cause the pan to warp.

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