Thermowood is any type of wood in which the structure is altered by high temperatures and steam. The entire thermo-modification process takes place in special chambers controlled by sensors and a computer.
The temperature changes the structure of the wood and the steam protects the wood from structural damage and cracks.
The heat gradually rises to 230 C over 4 days.

The wood takes on an attractive appearance thanks to its striking and darker colours. The appearance of softwood becomes similar to hardwood.

Since the wood has been altered at the molecular level, there is no need to protect it. However, darker coloured thermowood will usually turn naturally grey after exposure to the sun. By oiling or staining, thermowood can retain its original colours.

Any wood can be used. However, in northern Europe, softwood like spruce or pine is the most common wood used for thermo-modification. This makes it a reliable and attractive construction timber.

• Stable dimensions – the intense heat to which the wood is exposed during production dries the wood deep into the heartwood, removing all moisture and resin from the wood. This makes it the perfect material for outdoor wooden terraces. Thermally modified wood does not react to changes in humidity as strongly as untreated wood (reducing the risk of swelling, cracking and shrinkage) and therefore retains its shape better. Modified wood does not give off sap or resins even at high temperatures.
• Environmentally friendly – the softwood used in the production of thermal modification comes from well-managed forests, and since no chemicals or foreign substances are used in its production, Thermally modified wood is an environmentally friendly material, produced using only natural methods.
• Resistance to rot and fungi – the heating process, which breaks down the hemicellulose, leaves the wood without the right nutrients to allow rot and fungi to grow and develop.
• Durability – the heat treatment increases the average lifetime of the wood. The durability of the wood depends on the exact heat to which the wood is exposed, but generally the higher the temperature, the longer the durability.
• Better insulation – heat-treated wood is much more porous than untreated wood, which greatly improves its insulating properties.
• Environmentally friendly – unlike pressure-treated wood, heat-treated wood can be discarded or recycled as untreated wood when no longer needed.

Thermally modified wood is an excellent material for outdoor projects due to its high resistance to rot and moisture. Some of the most popular outdoor uses include:

• Exterior cladding
• Terraces
• Railings
• Wooden sunscreens
• Exterior wooden design elements

Its attractive appearance and removal of resin make it ideal for interior projects such as:

• Interior cladding
• Sauna benches
• Flooring