Top Thermally Modified Wood Brands: A Complete Guide

Wood has always been a classic material in construction and design. Its warmth, texture, and natural appearance make it one of the most loved building materials in the world. However, traditional wood has one major limitation: it is not always durable. Over time, moisture, insects, and harsh sunlight can damage natural wood, causing it to warp, crack, or rot.

To overcome these challenges, the process of thermal modification was developed. This innovative technique enhances the durability and stability of natural wood using heat treatment. Thermally modified wood has now become a preferred choice for exterior cladding, decking, and modern architecture because it combines natural beauty with improved performance.

In this article, we will discuss what thermally modified wood is, how it works, and the top thermally modified wood brands in the market. We will focus on Durathermo, Lunawood, and Kebony, and also mention other notable brands such as Accoya, Arbor Wood, and Thermory.

What Is Thermally Modified Wood?

Thermally modified wood is natural wood that has been treated with heat in a controlled environment. The process involves heating the wood to high temperatures, usually between 180°C and 220°C, in the absence of oxygen. This heat treatment changes the wood’s cell structure, reducing its ability to absorb moisture. As a result, the wood becomes more stable, durable, and resistant to decay.

Unlike chemical treatments, thermal modification does not involve harmful substances. It is an environmentally friendly process that relies only on heat and steam. The outcome is a sustainable product that performs better than untreated wood while maintaining its natural beauty.

How Thermal Modification Works

The process of thermal modification typically includes three main stages:

1. Drying: The wood is carefully dried to remove most of its natural moisture content.

2. Heating: The temperature is increased to around 200°C in a low-oxygen environment. This changes the chemical structure of the wood, making it more stable and resistant to decay.

3. Cooling and Conditioning: The wood is then cooled down gradually to prevent cracking. It is reconditioned to achieve the right balance of strength and flexibility.

This process results in wood that is darker in color, richer in tone, and much more stable than regular untreated timber.

Why Choose Thermally Modified Wood?

Thermally modified wood offers several important benefits that make it stand out from traditional timber.

1. Durability

The heat treatment removes sugars from the wood, which prevents fungi and insects from feeding on it. This makes the wood highly resistant to rot and decay.

2. Dimensional Stability

Thermally modified wood absorbs less water and does not expand or shrink as much as regular wood. This stability makes it ideal for outdoor use.

3. Sustainability

The process uses natural methods rather than chemicals, making it environmentally friendly and safe for both people and the planet.

4. Low Maintenance

Thermally modified wood requires minimal maintenance. While it can be oiled or stained for color retention, it performs well even without frequent treatment.

5. Aesthetic Appeal

The heat process deepens the color of the wood, giving it a rich tone similar to exotic hardwoods. Over time, it weathers gracefully into a beautiful silver-gray shade.

Because of these benefits, thermally modified wood is now used in facades, decks, ceilings, and furniture around the world.

The Top Thermally Modified Wood Brands

With the rising popularity of modified wood, many manufacturers have developed their own technologies and products. Among them, three brands consistently stand out for their quality, performance, and innovation: Durathermo, Lunawood, and Kebony.

1. Durathermo: Engineered for Performance and Design

Durathermo has established itself as one of the most advanced thermally modified wood brands in the market today. Known for its beautiful appearance, strength, and innovative technology, Durathermo is often chosen for both residential and commercial applications. It is distributed by Brazilian Lumber and has been featured in large-scale architectural projects.

Key Features of Durathermo

• Advanced Thermal Treatment: Durathermo uses a controlled heat process that strengthens the wood fibers while enhancing color and grain uniformity.
  
• Rich Color and Finish: The wood takes on a deep brown tone that resembles tropical hardwoods like teak or ipe.
  
• Dimensional Stability: Durathermo performs exceptionally well in humid or coastal climates because it does not easily expand or contract.
  
• Sustainability: The brand sources its raw materials from responsibly managed forests, ensuring an eco-friendly supply chain.
  
• Surlyn Co-Extrusion Technology: Some Durathermo products use a Surlyn protective coating, which improves resistance to UV exposure, weathering, and surface wear.
  
• Fire Resistance: Durathermo offers products with Class A fire resistance, suitable for both residential and commercial applications.

Applications

Durathermo is used in cladding, louvers, ceilings, soffits, and decking. It has been successfully installed in projects such as the Wings Over Miami Executive Airport, where Durathermo Ayous wood provided a refined and modern look.

Because of its precision engineering and consistent quality, Durathermo is considered one of the top thermally modified wood brands worldwide.

2. Lunawood: The Beauty of Nordic Innovation

Lunawood is one of the pioneers of thermal modification and a global leader in sustainable wood production. Founded in Finland, Lunawood combines Scandinavian design values with environmentally responsible manufacturing.

Key Features of Lunawood

• Premium Nordic Timber: Lunawood uses high-quality pine and spruce from the forests of Finland. These species are known for their clean texture and light color.
  
• Natural and Chemical-Free: The company uses only heat and steam in its modification process, making it 100 percent natural and safe.
  
• Sustainability Certified: Lunawood is PEFC certified and adheres to strict environmental standards.
  
• Durability and Stability: Lunawood’s products are extremely stable and perform well even in extreme weather conditions.
  
• Low Maintenance: The wood naturally resists decay, reducing the need for frequent coatings or treatments.

Applications

Lunawood is used extensively in facades, decking, fencing, and interior wall panels. When used outdoors, it gradually weathers to a soft silver-gray color that adds character to buildings.

Lunawood’s commitment to eco-friendly production and its reliable performance make it one of the most trusted thermally modified wood brands in the global market.

3. Kebony: Where Science Meets Sustainability

Kebony is another industry leader with a unique and patented wood modification process. Based in Norway, Kebony enhances wood properties through a bio-based treatment that changes its internal structure permanently.

Key Features of Kebony

• Innovative Bio-Modification: Instead of only using heat, Kebony introduces a bio-based liquid derived from plant waste. This liquid reacts with the wood’s structure, increasing its density and strength.
  
• Exceptional Durability: Kebony wood achieves durability similar to tropical hardwoods such as teak.
  
• Natural Aesthetic: The treatment results in a rich brown tone that ages gracefully into a silver patina over time.
  
• Eco-Friendly: Kebony’s process is completely sustainable and has earned recognition from green building organizations worldwide.
  
• Global Recognition: Kebony is used by leading architects for high-end decking, cladding, and public projects.

Applications

Kebony wood is used in a wide range of projects, from residential decking and façades to marine structures. It performs well in all climates and requires little maintenance.

Kebony’s unique scientific approach and long-term durability make it one of the top thermally modified wood brands on the market.

Other Notable Thermally Modified Wood Brands in the Market

While Durathermo, Lunawood, and Kebony lead the global market, other brands also offer quality thermally modified wood products. These include:

• Accoya: Famous for its acetylation process that enhances stability and lifespan.
• Arbor Wood: An American company known for domestic sourcing and reliable modification standards.
• Thermory: Headquartered in Estonia, Thermory supplies thermally modified wood products designed for interior and exterior architectural applications.

These brands add variety and innovation to the global thermally modified wood industry, giving architects and builders more options for sustainable design.

Comparing the Leading Thermally Modified Wood Brands

Brand	Country of Origin	Modification Method	Key Strength	Common Uses
Durathermo	USA / Brazil	Advanced thermal modification	Dimensional stability and Surlyn protection	Cladding, louvers, ceilings
Lunawood	Finland	Heat and steam modification	Natural sustainability and smooth finish	Decking, facades, interiors
Kebony	Norway	Bio-based chemical modification	Tropical-level durability and beauty	Decking, cladding, marine
Accoya	Netherlands	Acetylation	Extreme lifespan and consistency	Windows, doors, decking
Arbor Wood	USA	Thermal modification	Domestic sourcing and quality	Siding, decking, ceilings
Thermory	Estonia	Thermal modification	Nordic innovation and sustainability focus	Cladding, decking, siding, sauna materials

This comparison shows that each brand has its unique strengths and target applications. The best choice depends on project type, aesthetic goals, and environmental preferences.

Choosing the Right Thermally Modified Wood Brand

When selecting a thermally modified wood product for your project, consider the following factors:

1. Purpose: Determine whether the wood will be used for cladding, decking, ceilings, or interiors. Some woods perform better in certain applications.

2. Aesthetic Preference: Some woods retain their dark tones longer, while others fade to silver gray.

3. Climate: For hot or humid environments, brands like Durathermo and Kebony offer excellent dimensional stability.

4. Sustainability: If eco-friendly construction is important, look for certifications such as FSC or PEFC.

5. Budget and Maintenance: Some premium brands cost more upfront but require less maintenance over time.

The Future of Thermally Modified Wood

As more designers and builders focus on sustainability, thermally modified wood will continue to grow in popularity. It provides a renewable alternative to tropical hardwoods without sacrificing durability or appearance.

Manufacturers are now experimenting with new finishes, coatings, and treatment methods to further improve longevity and color retention. Brands like Durathermo, Lunawood, and Kebony are leading this innovation, offering advanced solutions for architects who demand both performance and style.

With global trends shifting toward sustainable design and energy efficiency, thermally modified wood will likely become a standard material for future construction.

Conclusion

Thermally modified wood has transformed the way we think about natural timber. It combines the timeless appeal of wood with the modern benefits of durability, stability, and sustainability.

Among the top thermally modified wood brands, Durathermo, Lunawood, and Kebony stand out for their innovation and consistent quality. Durathermo excels in performance and visual refinement, Lunawood embodies Nordic sustainability and elegance, and Kebony brings science and eco-technology together in a revolutionary way.

Brazilian Lumber is proud to be the distributor of these premium brands, offering high-quality thermally modified wood for projects of all kinds. Whether you’re working with Durathermo, Lunawood, Kebony, or other leading brands like Accoya, Arbor Wood, and Thermory, Brazilian Lumber provides a trusted source for sustainable building materials.

Whether you are designing a residential deck, commercial façade, or architectural feature, thermally modified wood offers lasting beauty and strength. Choosing from one of the top brands ensures that your project will not only look exceptional but also stand the test of time.