Heat Treated Wood


Protection without Chemicals

Thermal modification of wood is a natural method to safeguard it. This process enhances its resistance to decay, weather, and heat, and reduces the wood's movement due to moisture. The treatment involves no chemicals, as it relies on high temperatures and steam.

The procedure unfolds in detail, beginning with a carefully calibrated increase in the wood’s temperature that surpasses the 160°C threshold. This critical phase acts as a catalyst for subsequent protective modifications. Once the temperature reaches its zenith, it smoothly returns to its normal state. This organized heat process lasts between 1.5 to 3 days, carefully controlled by regulating hot air and steam.

In this controlled environment, a profound metamorphosis occurs within the wood’s structure. The heat penetration permeates its fibers, facilitating the removal of water and extractives, such as resins (terpenes). This extraction process significantly remodels the wood, enhancing its durability. The absence of these elements not only protects the wood against the corrosive forces of time but also revitalizes it. Thermo S is being manufactured at the highest temperature of 191°C and Thermo D on the other hand in the temperature of 212°C.

Our certifications ensure the delivery of premium ThermoWood® to you

Example applications of heat treated wood

The process of heat treating wood involves subjecting it to controlled elevated temperatures, inducing a range of physical and chemical changes. Notably, this treatment enhances the wood's resistance to decay, fungi, and insects, making it more durable and suitable for outdoor and indoor use.

ThermoWood® for indoors

Sauna interios

Thermowood is widely used in sauna interiors due to its resistance to heat and moisture. It adds a natural and aesthetically pleasing look to sauna spaces.

Wall and ceiling panels

Thermowood panels can be used for wall and ceiling coverings in interior spaces, providing a warm and cozy ambiance.

Thermowood 11

Thermowood can be used for flooring, offering both durability and an attractive appearance.


The enhanced stability and durability of thermowood make it suitable for crafting indoor furniture, such as tables, chairs, and cabinets.

ThermoWood® for outdoors

Exterior cladding

Thermowood is often used for exterior cladding on buildings. Its resistance to decay and dimensional stability make it a durable choice for protecting the exterior of structures.


Thermowood can be used for constructing terraces, providing a natural and long-lasting outdoor living space.

Thermowood 2
Fences and balcony

Thermowood fences are popular for balconies because of their durability and resistance to weather conditions, providing an attractive and functional boundary for outdoor spaces.

Carpentry Industry

Thermowood is used in various carpentry products, including windows, doors, and hot tubs, due to its enhanced durability and resistance to the elements.

Let's begin our collaboration with the best of wood available


Head Office

Our thermowood manufacturing is completaly made in Mänttä-Vilppula. You can find the contacts of our team from 'about' -page.

Lahnajoentie 196
35700 Mänttä-Vilppula

Contact us!

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