
Thermal modification improves the properties of wood by using heat and steam
Thermal modification is an eco-friendly method that enhances the natural properties of wood. The combined effect of heat and steam transforms the nutrients in the wood, making them less accessible to pests and microorganisms. This process increases the biological resistance of the wood and eliminates the need to saturate the wood with toxic substances.
Durability and beauty without chemicals
The process of thermal modification involves using only steam and heat. This process enhances the wood's resistance to decay and weathering as well as its thermal insulation properties. It also reduces the moisture content of the wood. Additionally, the wood develops a beautiful color at high temperatures, turning into a lovely brown shade. Thermally modified wood also has a characteristic scent.
Properties of thermally modified wood
- Excellent resistance - the panel has the highest biological resistance rating
- Stable - panel dimensions do not change with changes in air humidity
- Better insulating properties - the panel heats up less in sunshine than most other materials
- Lightweight material - wood has less moisture, making it lighter
- Long service life - thanks to its resistance to moisture, wood has a longer service life than ordinary wood materials
- Environmentally friendly - the wood's properties have been improved without the use of chemicals
- Safe waste management - no need to treat wood as hazardous waste


Thermally modified interior panels
Decorative panels that have been thermally modified are suitable for use in the sauna as well as in other areas of the home..


Thermally modified exterior cladding
Thermally modified exterior cladding provides an environmentally friendly and sustainable option for facades and terraces.

The thermal modification process only uses heat and steam.
In the heat treatment process, the wood's moisture content is effectively reduced to 0% within 35-46 hours. Specially prepared ovens rapidly heat the wood to 100°C before gradually increasing the temperature to 130°C, completely eliminating moisture. Following this, the wood is subjected to a temperature of 185-215 °C for two to three hours, customized according to its intended use. Notably, different temperature requirements for interior wood versus exterior cladding panels and decking boards are taken into account. Finally, the wood is meticulously cooled and humidified to achieve a desirable moisture content of 4-7%.
Do you need thermally modified panels for your interior design or construction project?
Siparila collaborates with professionals to identify the best solutions for every construction project. Apart from our standard products, we also offer a variety of project-specific products. If you require heat-treated wood cladding for an interior or building project, please get in touch with our experts.