The wood that exceeds expectations

Picture a wood that balances elegance, durability and versatility – a natural material that not only meets your demands but also exceeds your expectations.

With its striking grain patterns and excellent strength-to-weight ratio, ash has long been a favourite among craftsmen and architects seeking a blend of style and strength. Its natural beauty and performance make it stand out. While ash shares oak’s timeless appeal, strength and durability, it offers a slightly lighter weight, making it ideal for both traditional and contemporary designs.

MEET THERMO-ASH

Imagine taking a wood species already admired for its resilience and beauty and then elevating it to rival the performance of tropical hardwoods. Thermal modification enhances ash’s natural properties – rendering it highly resistant to moisture, decay and warping while deepening its naturally warm tones into rich, luxurious hues. The result is a wood species that doesn’t just look good but delivers lasting performance, even in the most challenging outdoor environments. 

Whether you’re crafting sophisticated interiors or creating outdoor spaces to endure the elements, thermally modified ash is the sustainable, high-performing choice that guarantees satisfaction – with no compromises required.   

The versatile choice for any application

Thermo-ash is an extremely durable material that’s suitable for a variety of applications. The material’s resistance to decay (class 1 rating for 25+ years) makes it perfect for long-lasting cladding and decking, ensuring beauty and functionality when used outdoors. Indoors, its warm tones and stability enhance walls, ceilings and floors, adding sophistication and resilience to both residential and commercial spaces.  

Thermory product portfolio offers a wide selection of designs and products for different applications: 

WHY THERMORY THERMO-ASH

Decor Rhomb tiles thermo-ash
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25+ YEARS OF EXPERIENCE

Thermory was the first company in the world to thermally modify ash on an industrial scale. We have over 25 years of unparalleled expertise, making us pioneers in the thermally modified wood industry. This long-standing experience ensures premium craftsmanship, innovative solutions and reliable product performance.

QUALITY SOURCING

We source only the finest hardwoods from sustainably managed forests, and our requirements for suppliers are high. Careful selection guarantees consistent quality, making our thermo-ash durable, visually appealing and environmentally responsible.

Thermory wood durability

CERTIFICATION

Thermory’s products meet comprehensive international certifications, ensuring environmentally conscious practices, sustainable sourcing, and top-tier quality. This commitment gives customers confidence in choosing materials that align with both performance and environmental standards.

TAILORED MAINTENANCE OPTIONS

Garage door thermo-ash cladding
Thermory Benchmark thermo-ash cladding

NATURAL WEATHERING

Let nature take its course. Thermory thermo-ash gracefully weathers over time, developing a silver-gray patina while maintaining its structural integrity – making it the perfect option for a low-maintenance natural look. 

ash decking

OILING

To retain thermo-ash’s brand-new appeal, its original rich tone can be enhanced and protected with regular UV-protectant oiling. This method preserves the wood’s deep brown color while adding extra defense against weathering and wear. 

Modern farmhouse with Thermo-ash cladding

FIRE PROTECTION

For added safety, Thermory thermo-ash can be impregnated with fire-retardant. In the process, the retardant is pressed deep into the cell structure of the wood. This option provides extra peace of mind while keeping the wood’s beauty intact.   

BUILT TO LAST, CRAFTED FOR BEAUTY

Private house Sneek, Thermory Benchmark thermo-ash cladding, architect JOUS Architecten, Photo IMAZZO
Thermory cladding durability

DURABLE

Thermory thermo-ash undergoes intense heat treatment, significantly boosting its resistance to rot, decay and harsh weather. With Class 1 durability and 25+ years of rot resistance, it offers long-lasting performance even in the toughest climates.

Thermory wood dimensional stability

DIMENSIONALLY STABLE

Our thermal modification process stabilizes ash wood by reducing its moisture content, minimizing warping and shrinking – even in challenging environmental conditions – meaning it can be relied upon to meet the demands of any project.

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SMOOTH

Thermory’s dedicated craftsmanship and advanced processing techniques ensure a flawlessly smooth finish. Our precise milling and expert finishing processes elevate ash into a premium wood product that feels every bit as good as it looks.

SUSTAINABILITY AT THE CORE

ASH VS ALTERNATIVES

Choosing Thermory thermo-ash supports sustainable forestry by reducing reliance on tropical hardwoods. Our ash is exclusively sourced from responsibly managed forests, helping to preserve the world’s most vulnerable ecosystems.

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CHEMICAL FREE

Our thermal modification process uses only heat and steam – no harmful chemicals. This environmentally friendly method creates long-lasting wood products while ensuring safety for people and the planet.

Decor Rhomb tiles thermo-ash

REPURPOSING SURPLUS MATERIALS

We make the most of our material. Surplus ash from our production processes is transformed into a multitude of beautiful products such as Decor Rhomb, Herringbone decking and Shingles, reducing waste and maximizing sustainability across our operations.


Thermory thermo-ash brings the perfect blend of natural beauty, durability, and sustainability. We hope you’re as inspired by its timeless elegance as we are.

LET’S WORK TOGETHER ON YOUR NEXT PROJECT: