Outdoor pizza oven

Why Does Wood Fire Pizza Oven Crack?

When you see a crack in your wood fire oven, don't panic! Our clients would always freak out and call us, thinking we were selling substandard outdoor wood fired pizza ovens when they found some cracks coming out. But we totally understand the concern – after all, a wood-fired pizza oven is an investment, and you want it to stand the test of time, serving up delicious pizzas for years to come.

But do you know why those pesky cracks appear? We know that seeing this can make you feel uneasy, but understanding why wood-fired pizza ovens crack is the first step in ensuring you can prevent it from happening or address the issue if it already has.

Brick front oven - TWFC

Common Causes of Cracks in Wood-Fired Pizza Ovens

Thermal Stress and Rapid Temperature Changes

You know that thrilling moment when your wood-fired pizza oven reaches its peak of heat? Well, that enthusiasm may unintentionally cause fractures. The truth is that the strong heat generated when baking pizza can cause rapid temperature variations within the oven. This may cause the materials to expand and contract quickly, a condition known as thermal stress, which is a primary cause of those unsightly fissures.

Poor Construction and Design

Ever heard the saying, "You're only as strong as your weakest link"? The same holds for pizza ovens that burn wood. Cracks may appear out of the blue if the design includes a few weak places or if the building materials could be better. It all comes down to carefully considered design and high-quality materials. If you pay attention to both, your oven may be susceptible to structural flaws.

Insufficient Curing Method

Yes, the curing process—a phase that is often overlooked or underestimated. Consider it your pre-workout warm-up. It's similar to jumping into a strenuous workout without stretching if you skip it or perform it incorrectly. It takes time for the materials in your oven to adjust to the heat gradually. If you hurry this procedure, you may have to deal with cracks before you'd like to. After you take the time to adhere to the suggested curing guidelines, your oven will be grateful.

Tips for Preventing Cracks in Wood-Fired Pizza Ovens

Proper Installation and Construction

Imagine having a sturdy base and a well-built oven. Your first line of protection against cracks is that. Invest in expert installation to guarantee that everything is positioned correctly. Make sure to take high-quality building supplies. You should use the best materials for your oven since they will last long and resist heat.

Curing Process Best Practices

When it comes to curing your wood-fired pizza oven, patience is a virtue. It's not a race, so strictly adhere to the rules. When curing, gradually raise the temperature to give the materials time to adjust to the increased heat. It's important to follow this procedure precisely because it's the key to an oven that won't fracture.

Regular Maintenance and Inspection

Consider your pizza oven an investment that requires maintenance. Check it frequently for indications of wear and tear. Early detection of cracks can prevent headaches later on because they frequently start small. Look for any structural problems, broken insulation, or loose brickwork. 

Mindful Firing and Cooking

Consider your wood-fired pizza oven to be a graceful partner in dance. Increase the power to it gradually. Steer clear of abrupt, sharp temperature swings that could shock the materials. In the same way, avoid packing the oven with too many pizzas at once during cooking. To help it regain its thermal homeostasis, give it a break. Stress-induced cracks can be greatly avoided by giving your oven some TLC during firing and cooking.

Weather Protection

Mother Nature is not always kind, especially when it comes to outdoor pizza ovens. If the elements expose your wood-fired oven, consider covering it. Extreme temperature changes, precipitation, and snow can be hard on oven materials. A straightforward cover or a special outside structure can serve as a shield to prevent weather-related cracks and ensure your pizza adventures continue to rain or shine.

Repairing Cracks in Wood-Fired Pizza Ovens

Identifying the Type and Severity of Cracks

Become familiar with the fractures in your oven before attempting repairs. Do they have deep cracks or hairline fissures? Selecting the best repair technique is aided by understanding the type and severity. Treatment for small surface cracks may differ from that for major structural problems. Before moving on, take your time to inspect and diagnose.

DIY Repair Options

For small cracks, you can take matters into your own hands. It's like giving some first aid to your oven when you patch up little surface cracks. Use mortar or refractory cement that is intended for high temperatures. After properly cleaning the crack, apply the repair compound and let it cure. This do-it-yourself project can significantly reduce the likelihood of cracks propagating.

Using Refractory Mortar for Larger Cracks

When the cracks are more substantial, it's time to bring in the big guns – refractory mortar. This unique material is made to withstand high temperatures and offer strong structural support. After thoroughly cleaning and applying the refractory mortar, ensure the broken area has cured. Larger cracks require more care, but you may strengthen your wood-fired oven again with the correct supplies and techniques.

When to Get Expert Help

Some cracks are too severe for do-it-yourself fixes. It may be time to bring in the experts if you have significant structural damage or if cracks continue to emerge despite your best efforts. Expert oven experts can evaluate the issue, make the necessary repairs, and provide insightful guidance on avoiding future cracks.

Preventive Measures Post-Repair

Remember the after-repair care once you've filled in those gaps. Restart your oven gradually at a high temperature so the mended portions can be cured completely. Closely check the oven's operation and do routine maintenance to identify any problems early. Prevention involves more than just patching up cracks—it also involves making sure they don't reappear.

Frequently Asked Questions

Can I still use my wood-fired pizza oven if it has small cracks?

Yes, small surface cracks can often be repaired, allowing you to continue using your oven. It's essential to address them promptly to prevent further damage.

How can I tell if the cracks in my oven are severe or just cosmetic?

Severe cracks may extend deep into the structure, affecting the oven's integrity. If you need more clarification, it's advisable to consult a professional for a thorough inspection.

What type of materials are best for preventing cracks in wood-fired pizza ovens?

High-quality refractory materials are ideal for constructing wood-fired pizza ovens. They withstand high temperatures and minimize the risk of cracks.

How can I prevent cracks from reappearing after repairing my wood-fired pizza oven?

After repairs:

  • Gradually reintroduce the oven to high temperatures.
  • Conduct regular inspections.
  • Follow proper maintenance practices to minimize the risk of recurring cracks.


So there you have it. Next time you see cracks starting to show on your outdoor oven, don't panic! Instead, grab your tools, roll up your sleeves, and look closer. Assess if it's a challenge you can tackle with DIY magic or if it's time to seek professional assistance.

Whether it's a quick fix or a call for backup, approach it as an opportunity to nurture and extend the life of your wood-fired pizza oven.

Back to blog