KUUSI - Thermally Modified Spruce TG&V

KUUSI - Thermally Modified Spruce - 90mm x 19mm x 4.8mt

Thermowood®, or heat-treated wood, is suitable for many purposes. Inside, it can be used on walls, ceilings, floors and saunas. Outside, it is suitable for use as cladding, facades and decking.
Heat treatment improves both the qualities and the appearance of the wood. The beautiful brown colour gives it a stylish, almost hardwood-like look.

Heat treating wood is a natural way of protecting it. It improves its rot, weather and thermal resistance, and reduces the movement of wood due to moisture. No chemicals are used in the treatment, since it is based on high temperature and water vapour.

During the heat treatment, the temperature of the wood is first increased to over 160 °C, and then deceased back to the normal temperature. The treatment lasts from 1.5 to 3 days, and it is regulated with the help of hot air and water vapor. The structure of the wood changes as water and extractives, such as pitch (terpenes), are removed from it.