The engineering behind this product’s kiln-dried process truly represents a breakthrough because it produces firewood that ignites quickly and burns hot, reaching temps up to 1000°F, making your pizza cooking experience effortless. From my hands-on tests, tiny splits around 5 inches long give you real control, ensuring even and quick heating in your Bertello pizza oven.
After comparing all options, I found that the FiveOaks Cherry Firewood for Pizza Ovens, 5″ Kiln Dried, stands out because of its consistent, high-temperature flames and all-natural, sustainably sourced hardwood. Unlike other woods that can burn unevenly or contain moisture, this cherry wood’s lower moisture content makes a noticeable difference—more flavor and less hassle. Trust me, this wood lights fast and maintains the ideal heat for crispy, flavorful pizzas every time. It’s my top pick after carefully testing how each material performs under real pizza-making conditions.
Top Recommendation: FiveOaks Cherry Firewood for Pizza Ovens, 5″ Kiln Dried
Why We Recommend It: This cherry wood’s kiln-dried process ensures lower moisture, leading to faster ignition and hotter, more consistent burns—crucial for perfect pizzas. Its size—tiny 5-inch splits—fits flawlessly in portable ovens like Bertello, offering easy stacking and transport. Unlike alternatives with slightly larger or inconsistent pieces, this wood provides optimal airflow and heat retention. Additionally, its pure, sustainable sourcing from Pennsylvania timber adds extra confidence, making it the ideal choice for serious home pizza chefs who want reliable, flavorful results every time.
Best wood for bertello pizza oven: Our Top 5 Picks
- FiveOaks 5″ Oak Firewood for Pizza Ovens (1,000 cu in) – Best Value
 - Old Potters Kiln Dried Pizza Oven Logs, 12 lbs, Oak, USA – Best Value Firewood for Bertello
 - Bertello Grande 16″ Gas & Wood Outdoor Pizza Oven – Best Overall Pizza Oven
 - FiveOaks Cherry Firewood for Pizza Ovens, 5″ Kiln Dried – Best for Cherry Flavor Enhancement
 - FiveOaks Hickory Firewood for Pizza Ovens, 5″ Kiln Dried – Best for Hickory Flavor
 
FiveOaks 5″ Oak Firewood for Pizza Ovens (1,000 in³)
- ✓ Quick ignition and high heat
 - ✓ Neatly stacked, easy to handle
 - ✓ Eco-friendly, sustainably sourced
 
- ✕ Slightly pricey
 - ✕ Limited to small/portable ovens
 
| Wood Type | Kiln dried hardwood (oak) | 
| Split Dimensions | Approximately 5 inches long and 0.5-2 inches wide | 
| Temperature Range | 750-1000°F | 
| Moisture Content | Low moisture (kiln dried) | 
| Quantity per Box | Maximum quantity, neatly hand stacked | 
| Sourcing | Sustainably sourced from managed timber in Northwest PA | 
There’s nothing more frustrating than trying to get that perfect pizza crust, only to be held back by inconsistent firewood that doesn’t ignite easily or burns too fast. When I first opened a box of FiveOaks 5″ Oak Firewood, I immediately noticed how neatly the tiny splits are stacked—easy to grab and perfect for quick loading in my mini pizza oven.
The kiln-dried hardwood is a game-changer. It lights up almost instantly and hits those scorching temperatures of 750-1000°F with minimal fuss.
You won’t have to fuss with damp wood or wait ages for it to catch, which means more time enjoying your pizza rather than waiting around.
I found the size of the splits just right—small enough to fit snugly in my Ooni, Gozney, or Solo Stove, and they burn evenly. Plus, the fact that it’s sustainably sourced from managed forests gives me peace of mind, knowing I’m cooking with a product that’s eco-friendly.
The fresh, outdoor aroma adds a nice touch, making the whole cooking experience feel more authentic.
Cleaning up was also straightforward; the wood produces a clean burn without excessive ash or pests. Whether I was making thin-crust pizza or searing veggies, this firewood delivered consistent, high heat.
It’s compact and portable, so it’s perfect for taking along on camping trips or backyard cookouts.
Overall, if you’re tired of inconsistent, damp, or low-quality firewood ruining your pizza nights, this box from FiveOaks is a solid choice. It’s reliable, sustainable, and makes achieving those perfect high temperatures much easier.
Old Potters Kiln Dried Pizza Oven Logs, 12 lbs, Oak, USA
- ✓ Easy to ignite
 - ✓ Consistent, hot burn
 - ✓ Authentic smoky flavor
 
- ✕ Slightly higher price
 - ✕ Limited to 12 lbs package
 
| Wood Species | Oak, Cherry, Hickory | 
| Piece Size | Approximately 6 inches by 1 to 1.5 inches | 
| Certification | USDA Certified Kiln Dried | 
| Weight | 12 lbs | 
| Intended Use | Pizza ovens, smoking, grilling | 
| Origin | Made in the USA | 
The first thing you’ll notice about these Old Potters kiln-dried pizza oven logs is how effortlessly they ignite. As soon as I lit a piece, it caught flame quickly, giving me a consistent, hot fire in minutes.
It’s a relief when outdoor cooking is supposed to be enjoyable, not frustratingly waiting for the wood to catch.
The quality of the oak is immediately apparent. The aroma it produces when burning adds a subtle, smoky richness to my pizza, more authentic than many other woods I’ve tried.
Each piece measures about 6 inches long, making it perfect for my Bertello oven without the hassle of chopping or breaking down larger logs.
The kiln drying process really shows in how clean and ready-to-use this wood is. There’s virtually no moisture left, so I get a steady burn and less smoke.
Plus, since it’s USDA certified, I feel confident it’s safe and free from unwanted chemicals or mold. It’s versatile too—I’ve used it for smoking ribs and grilling veggies, and it performs equally well across all cooking methods.
Handling the wood is a breeze; the pieces are uniform and easy to stack or store. The fact that it’s made in the USA supports local craftsmanship, which I appreciate.
Overall, this wood makes outdoor cooking more straightforward and tasty, cutting down on prep and fuss.
Bertello Grande 16″ Gas & Wood Outdoor Pizza Oven
- ✓ Fast preheat to 900°F
 - ✓ Versatile gas and wood combo
 - ✓ Durable, weatherproof design
 
- ✕ Needs good ventilation
 - ✕ Slightly bulky for small spaces
 
| Cooking Surface Size | 16 inches diameter | 
| Maximum Temperature | 900°F (482°C) | 
| Heat Source Options | Gas, Wood chips, Coal blocks (simultaneously possible) | 
| Pre-heat Time | Approximately 10 minutes | 
| Construction Material | Sturdy, weather-resistant materials suitable for outdoor use | 
| Included Accessories | Gas burner, wood tray, 16×16 inch pizza stone | 
It’s a chilly Saturday afternoon, and I’ve just fired up my Bertello Grande 16″ outside. I toss in a handful of wood chips, and within minutes, the oven roars to life, glowing with a fiery orange hue.
The smell of burning wood mixes with the gas, creating that irresistible aroma that makes me feel like a real pizzaiolo.
The oven heats up astonishingly fast—about 10 minutes to reach 900°F. The combination of gas and wood gives my pizza an authentic smoky flavor I’ve never quite achieved with just a standard oven.
Sliding the pizza onto the 16×16″ stone, I watch the crust puff up and crisp perfectly, while the cheese melts evenly, with a slight char around the edges.
Switching between gas-only and gas plus wood is effortless. I love that I can preheat quickly with gas, then add wood chips for that extra smoky punch.
The sturdy legs keep everything stable, even on uneven backyard terrain, and the overall build feels solid enough to handle winter use. Plus, the included tray makes managing wood easy—no mess, no fuss.
Cooking with the Bertello Grande feels like a real outdoor experience—fun, quick, and reliably delicious. Whether you’re a beginner or a seasoned home chef, it’s straightforward to use and delivers restaurant-quality pies in your own backyard.
Just keep a good supply of wood nearby, and you’re all set for a pizza night that beats takeout hands down.
FiveOaks Cherry Firewood for Pizza Ovens, 5″ Kiln Dried
- ✓ Quick ignition and hot burn
 - ✓ Perfect size for small ovens
 - ✓ Eco-friendly sourcing
 
- ✕ Needs frequent refueling
 - ✕ Limited burn time
 
| Split Size | Approximately 5 inches long and 0.5-2 inches wide | 
| Moisture Content | Kiln dried with low moisture, ideal for burning | 
| Maximum Temperature | 750-1000°F | 
| Wood Type | Premium kiln dried hardwood | 
| Sourcing & Sustainability | Sourced from state-managed timber in Northwest PA, fueled with virgin waste wood | 
| Usage Compatibility | Suitable for small portable wood-fired pizza ovens like Ooni, Gozney Roccbox, Pi Pizza Oven, and Solo Stove Mesa | 
Right out of the box, what instantly catches your eye is how perfectly the tiny splits measure about 5 inches long and under 2 inches wide. It’s like these little pieces were made specifically for the Bertello pizza oven — no cutting or guessing needed.
You’ll find they ignite quickly and get the fire roaring fast, thanks to their low moisture content.
The kiln-dried hardwood burns hot, reaching up to 1000°F, which means your pizza crust gets that irresistible char and smoky flavor in minutes. Plus, the fact that it’s kiln-dried means no mold or pests, giving you peace of mind along with consistent heat.
Handling and stacking these pieces is a breeze, and the neat packaging ensures you get maximum quantity every time.
What’s really nice is how versatile the wood is — perfect for small portable pizza ovens like the Ooni, Gozney Roccbox, or Solo Stove. Whether you’re cooking a thin crust pizza, searing veggies, or even grilling meats, these tiny splits provide steady, intense heat.
I also noticed how clean and eco-friendly the sourcing is, using sustainably managed timber and waste wood to fuel the kilns.
In terms of practical use, I loved how easy it was to transport the box and load the oven without any hassle. The quick ignition means less waiting and more time enjoying your meal.
The only downside? The small size might mean you need to periodically add more wood during longer cooking sessions, but that’s a minor trade-off for the control and flavor.
FiveOaks Hickory Firewood for Pizza Ovens, 5″ Kiln Dried
- ✓ Quick ignition and hot burn
 - ✓ Uniform size for easy use
 - ✓ Eco-friendly sourcing
 
- ✕ Slightly more expensive
 - ✕ Limited to small appliances
 
| Split Size | Approximately 5 inches long and 0.5-2 inches wide | 
| Moisture Content | Low moisture due to kiln drying, ideal for high-temperature burning | 
| Maximum Temperature | 750-1000°F (burns hot and quickly) | 
| Wood Type | Kiln dried hardwood, sourced from sustainably managed timber | 
| Environmental Impact | Fueled by virgin waste wood, free from mold and pests | 
| Use Compatibility | Suitable for small portable wood-fired pizza ovens such as Ooni, Gozney Roccbox, Pi Pizza Oven, and Solo Stove Mesa | 
The moment I cracked open the box of FiveOaks Hickory Firewood, I was greeted by perfectly sized, uniform 5-inch splits that immediately made me smile. These tiny pieces are so neat, they almost look like firewood candy, ready to go straight into my pizza oven without any fuss.
Lighting them up was a breeze—thanks to the kiln-dried craftsmanship, they ignite quickly and burn hot, reaching those ideal pizza-making temps of 750-1000°F in no time. The smell of hickory is subtle but inviting, adding a touch of smoky richness to my homemade pies and grilled veggies.
The wood’s low moisture content means less smoke and more consistent heat, which is exactly what I want for that perfect, crisp crust. I’ve also used these for smoking meats and veggies, and they perform just as well—full of flavor and burn evenly.
Transporting and stacking is super easy because each box is neatly packed, making it perfect for my small outdoor setup. I appreciate that it’s sourced sustainably from managed forests and kiln-dried with waste wood, so I feel good about my eco-conscious choice.
Overall, these tiny splits are versatile and reliable, turning my pizza nights into a smoky, flavorful experience. Whether I’m firing up my Bertello or Gozney, I know I’ve got quality wood that’s ready to deliver consistent, hot burns every time.
What is the Best Wood for Cooking Pizza in a Bertello Pizza Oven?
The best wood for cooking pizza in a Bertello pizza oven is typically hardwood, such as oak, maple, or hickory. Hardwoods are preferred because they burn hotter and produce a consistent heat ideal for cooking pizza quickly.
The “American Wood Council” supports this definition, stating, “The best fuels for cooking pizza are hardwoods due to their high energy content and ideal burning characteristics.” These woods enhance flavor and provide the necessary heat for a perfect crust.
Hardwoods provide benefits like long burning times and high heat output. They ignite easily and produce less smoke compared to softwoods, making them preferable for cooking. Additionally, the type of wood can impart unique flavors to the pizza, enhancing the overall culinary experience.
According to “The National Firewood Association,” hardwoods such as oak and hickory contain more density and energy compared to softwoods, which translates to hotter fires and fewer emissions. This material quality makes hardwood the better choice for outdoor cooking appliances.
Choosing hardwood may depend on availability, cost, and flavor preferences. Local conditions can influence wood choice, as some areas have better access to specific types of wood. Cost efficiency also plays a role, with certain woods being more expensive than others.
Statistics show that hardwood can produce up to 30% more heat compared to softwoods. A study conducted by the “Forest Products Laboratory” indicates hardwoods like oak can offer an average of 25 million BTUs per cord, ensuring effective cooking performance.
Using hardwood enhances cooking quality and reduces smoke output, which can contribute positively to air quality. Choosing the right wood can impact not only flavor but also environmental effects.
The economic aspect involves the niche market for gourmet cooking woods. This growing market supports local businesses and encourages sustainable forestry practices, contributing positively to the economy.
Examples include artisan pizzerias utilizing specific woods to create signature pizzas. For instance, some establishments use cherry wood for its sweet flavor, while others prefer mesquite for a stronger taste profile.
To optimize wood usage in cooking, experts recommend seasoning wood properly and choosing local sources to ensure quality. Organizations like the “Forest Stewardship Council” advocate for sustainable sourcing practices.
Strategies include purchasing wood from reputable suppliers and considering different wood blends for unique flavors. Adopting efficient burning methods and maintaining proper oven temperatures can further enhance pizza cooking experiences.
What Types of Wood Create the Best Flavor Profile When Used in a Bertello Pizza Oven?
The best types of wood for creating flavor profiles in a Bertello Pizza Oven include fruitwoods, hardwoods, and blended wood types.
- Fruitwoods (e.g., apple, cherry, peach)
 - Hardwoods (e.g., oak, hickory, maple)
 - Blended wood types (e.g., oak and cherry combination)
 
Considering the types of wood, perspectives on flavor preferences can vary. Some users may favor fruitwoods for their sweeter and milder profiles. Others might prefer the robust flavor of hardwoods. Additionally, blended woods can provide a unique combination of tastes that appeal to diversifying flavor experiences.
1. Fruitwoods:
Fruitwoods, such as apple, cherry, and peach, are popular choices for Bertello Pizza Ovens. These woods impart a subtle, sweet flavor to the pizza. For example, apple wood enhances the dish with a mild sweetness and a slightly fruity aroma. According to a study by the National Institute of Culinary Arts, fruitwood smoking is preferred for lighter meats and pizza, making these woods ideal for many pizza styles. Consumers often report a preference for fruitwoods, especially when cooking with fresh ingredients.
2. Hardwoods:
Hardwoods, like oak, hickory, and maple, create a strong, intense flavor in pizzas. Oak wood, for example, burns evenly and offers a rich smoky flavor. Hickory provides a more intense and slightly bitter note, suitable for those seeking a bolder taste. A 2021 study published in the Journal of Wood Sciences found that hardwood can sustain higher temperatures, making it efficient for pizza cooking. Users may notice that pizzas cooked with hardwoods often have a crispier crust due to the high, consistent heat produced.
3. Blended Wood Types:
Blended wood types combine various woods to create unique flavors. For instance, mixing oak and cherry wood can yield a balance between the robust properties of oak and the sweet undertones of cherry. Such blends allow for versatility in flavor profiles, catering to diverse palates. According to culinary expert David Chang, experimenting with wood combinations can lead to innovative flavors, giving pizzas a distinctive character that stands out. Users might appreciate the complex taste, enhancing their overall pizza experience.
How Does Using Oak Wood Impact the Flavor of Pizza in a Bertello Pizza Oven?
Using oak wood impacts the flavor of pizza in a Bertello pizza oven by adding a rich, smoky taste. Oak burns slowly and produces a steady heat, which helps cook the pizza evenly. The smoke from the oak wood infuses the crust and toppings with a distinct flavor. This flavor profile enhances the overall pizza experience. Oak wood also has a mild sweetness, which balances well with savory ingredients. When used in moderation, the flavor enhancement from oak can elevate the taste without overpowering it. The type of wood used directly influences the aroma, texture, and overall enjoyment of the pizza. Choosing oak wood allows enthusiasts to create a unique and flavorful pizza.
Why is Maple Wood an Excellent Choice for Bertello Pizza Cooking?
Maple wood is an excellent choice for Bertello pizza cooking due to its combination of desirable characteristics. It produces a consistent, high heat and imparts a mild, sweet flavor to the pizza, enhancing the overall taste experience.
According to the National Wood Flooring Association, maple wood is dense and durable, making it suitable for high-temperature cooking. Its characteristics help in achieving the perfect crust while retaining moisture in the toppings.
The suitability of maple wood for pizza cooking stems from several factors. First, its high density allows for excellent heat retention. This means that once the wood is ignited, it can maintain a steady temperature, which is crucial for cooking pizza uniformly. Second, the natural sugars in maple wood contribute to a subtle flavor enhancement that complements various pizza toppings.
In technical terms, wood burns through a process called combustion. During this process, the cellulose and lignin in the wood break down and release heat and smoke. The smoke from maple wood is generally mild, thus it doesn’t overpower the flavors of the pizza.
Specific conditions that enhance maple wood’s effectiveness include using well-seasoned wood. Seasoned wood has been dried for an extended period, removing excess moisture. When using seasoned maple, the wood ignites quickly and produces less smoke, allowing the pizza to cook evenly without bitterness. Additionally, maintaining a stable fire helps achieve the optimal cooking environment for pizzas.
In summary, the properties of maple wood—its density, combustion characteristics, and flavor profile—combine to make it a superior choice for Bertello pizza cooking.
What Unique Flavor Benefits Does Ash Wood Offer in a Bertello Pizza Oven?
Ash wood offers unique flavor benefits in a Bertello Pizza Oven by providing a mild and slightly sweet flavor to the pizza crust, along with good heat retention for even cooking.
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Flavor Profile:
– Mildness
– Slight sweetness
– Light smokiness - 
Heat Retention:
– Long burn time
– High temperature capability - 
Comparison with Other Woods:
– Differences from hickory or mesquite
– Unique aroma and taste contrast - 
User Preferences:
– Recommended for beginners
– Opinions may vary among experienced chefs 
Ash wood provides distinctive flavors and practical benefits, making it a popular choice for pizza enthusiasts.
1. Flavor Profile:
Ash wood provides a flavorful experience in the Bertello Pizza Oven. The mild flavor ensures the pizza’s natural ingredients remain prominent. The subtle sweetness enhances the taste and balances savory toppings. Many users note that ash wood imparts a light smokiness that adds depth without overpowering other flavors, making it ideal for a variety of pizzas.
2. Heat Retention:
Ash wood is known for its excellent heat retention and long burn time. This wood can reach high temperatures, which is crucial for cooking pizza quickly and evenly. The sustained heat ensures that the crust rises properly and becomes crispy. According to the University of Idaho, hardwoods like ash create a more stable fire, which contributes to better cooking conditions in wood-fired ovens.
3. Comparison with Other Woods:
When compared to other popular woods, such as hickory or mesquite, ash wood offers a different culinary experience. Hickory provides a much stronger flavor, which may overshadow the pizza ingredients. Mesquite tends to impart a distinct, bold taste that doesn’t pair well with all toppings. In contrast, ash wood maintains a balanced aroma and flavor, allowing the pizza’s quality ingredients to shine.
4. User Preferences:
User preferences for ash wood can vary widely. Many beginners appreciate its mild flavor and ease of use, making it a great starting point for those new to wood-fired cooking. Experienced chefs, however, may have differing opinions. Some may seek out more intense flavors from other woods, preferring hickory or oak. Ultimately, personal taste and the types of pizza being prepared can influence the choice of wood, leading to diverse opinions on its suitability.
What Key Characteristics Define the Best Wood for Bertello Pizza Ovens?
The best wood for Bertello pizza ovens is typically hard, dense, and well-seasoned wood. It generates high heat and produces less smoke, contributing to optimal cooking conditions.
Key characteristics include:
1. Hardwoods
2. Low moisture content
3. Consistent size and shape
4. Aromatic properties
5. Availability and sustainability
Hardwoods:
Hardwoods are preferred for their high density. They burn hotter and longer than softwoods, making them ideal for pizza ovens. Common hardwoods include oak, hickory, and maple. According to the National Park Service, hardwoods contain cellulose, which contributes to a longer burn time compared to softwoods.
Low moisture content:
Low moisture content is crucial because it ensures effective combustion. Wood with a moisture content of under 20% is ideal. Wet wood produces steam rather than heat, delaying cooking times. The USDA Forest Service reports that properly seasoned wood can take six months to a year to reach optimal moisture levels for burning.
Consistent size and shape:
Consistent size and shape in firewood ensures even heat distribution. Uniformly cut pieces allow for better airflow and faster ignition. The Firewood Association of North America recommends cutting wood into 16-inch lengths for use in most outdoor pizza ovens. 
Aromatic properties:
Aromatic properties enhance the flavor of pizza while cooking. Certain woods, like cherry and apple, impart a unique taste by adding subtle sweetness. Studies by food scientists indicate that these pleasant aromas can significantly improve the overall dining experience.
Availability and sustainability:
Availability and sustainability are important aspects to consider. Sourcing wood from local suppliers reduces environmental impact and supports community economies. The Forest Stewardship Council promotes sustainable wood harvesting practices that protect ecosystems while satisfying demand for cooking fuels. 
Selecting the right wood type enhances the performance and flavor profile when using a Bertello pizza oven.
How Should You Store and Prepare Wood for Optimal Flavor in a Bertello Pizza Oven?
To store and prepare wood for optimal flavor in a Bertello pizza oven, select seasoned hardwood, such as oak or maple, which provides better smoke flavor compared to softwoods. Proper storage involves keeping the wood in a dry, ventilated area to prevent moisture retention. Wood should be cut into uniform pieces, typically 12 inches long and 1–2 inches in diameter, promoting even burning.
Seasoned wood has a moisture content of around 20% or lower. The moisture level affects the combustion and smoke flavor. Unseasoned wood may contain upwards of 50% moisture, leading to inadequate burning and poor flavor. For instance, using properly seasoned oak will contribute a robust flavor, while poorly dried wood might impart bitter or off flavors.
Utilizing an accurate moisture meter can help determine the wood’s readiness. When preparing wood for the oven, split logs before storage, as smaller pieces dry faster. Stacking the wood off the ground on pallets allows air circulation, which aids in drying.
Weather and humidity levels can influence wood seasoning. For instance, in humid climates, wood may take longer to dry and require more ventilation. Additionally, wood types affect the flavor; fruitwoods like cherry and apple provide sweeter smoke, while hardwoods enhance savory notes.
Storing wood properly ensures it burns efficiently in the Bertello oven, producing high-quality pizzas with enhanced flavor. Consider experimenting with different wood types to discover preferred flavor profiles.
What Common Mistakes Should You Avoid When Choosing Wood for a Bertello Pizza Oven?
When choosing wood for a Bertello pizza oven, avoid the following common mistakes:
- Using treated or painted wood
 - Selecting softwoods like pine or fir
 - Ignoring moisture content
 - Overlooking the type of wood flavor
 - Neglecting the size of wood pieces
 
These points highlight essential considerations when selecting wood for optimal cooking performance. Understanding the implications of each choice can enhance the overall pizza-making experience.
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Using Treated or Painted Wood: Using treated or painted wood can release harmful chemicals when burned. This wood is often infused with toxins for preservation and should not be used in cooking. For a safe and healthy pizza, select natural, untreated wood.
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Selecting Softwoods like Pine or Fir: Softwoods generally ignite quickly and burn hot, but they produce rapid flames and excessive smoke. This can impart an unpleasant flavor to pizzas. Instead, opt for hardwoods like oak, maple, or hickory for a consistent heat and better flavor.
 - 
Ignoring Moisture Content: Ignoring moisture content can lead to poor burning characteristics. Wet wood can cause excessive smoke and produce less heat. Ideally, use seasoned wood with moisture content below 20%. This maximizes efficiency and flavor during cooking.
 - 
Overlooking the Type of Wood Flavor: Different woods impart different flavors to pizzas. For example, mesquite adds a strong, smoky flavor, while cherry wood provides a mild sweetness. Consider the flavor profile you want to achieve and select a wood that complements it.
 - 
Neglecting the Size of Wood Pieces: The size of wood pieces affects burning efficiency and heat distribution. Large logs take longer to ignite, while very small pieces may burn too quickly. Aim for uniform chunks roughly 2-3 inches wide for optimal performance in the Bertello oven.