Thermowood

Thermowood is a thermally modified wood product that undergoes a high-temperature treatment process in a low-oxygen environment. This process, typically carried out at temperatures between 170 and 210 degrees Celsius, alters the wood's cellular structure. The heat treatment breaks down hemicellulose, a component of wood that contributes to its instability and susceptibility to moisture. This reduction in hemicellulose results in a more dimensionally stable material with significantly reduced moisture content and swelling.

The thermal modification process also enhances the durability and resistance of the wood to decay and insect attack. By changing the composition of the wood, it becomes less appealing and digestible for organisms that cause rot and infestation. This means that Thermowood can be used in exterior applications without the need for chemical preservatives, making it an environmentally friendly alternative.

Common wood species treated to create Thermowood include pine, spruce, ash, and poplar. The appearance of the wood changes during the process, typically developing a richer, darker color. Thermowood finds applications in various sectors, including decking, cladding, interior flooring, and sauna construction, due to its improved stability, durability, and aesthetic qualities. The treatment process is chemical-free, relying solely on heat and steam.