Uses: The nature of Thermowood makes it a versatile material. It can be used for both interior and external projects. Most commonly used for exterior purposes, Thermowood cladding and Thermowood decking are popular. This is because it has a high resistance to moisture and decay. For interior use, Thermowood is most commonly used for interior cladding, saunas, furniture and flooring. It is used mainly for its appearance and removal of resin.
General Description: Thermowood® is a heat-treated timber, usually made from Scandinavian softwoods. It is created using a chemical-free, heat-treating process. Pine and spruce is subjected to heat of approximately 180 - 230 degrees celsius within a chamber kiln for up to 96 hours. Steam is used as a protective gas in order to protect the wood and prevent splitting. This process changes the internal structure of the wood, drying it out to make it more stable and durable. Thermowood has a density of 350 - 480 kg/m3. The appearance and colour of the wood largely depend on the amount of time the wood spends in the kiln. Generally the longer the heat exposure, the darker the colour of the wood.
Overall Thermowood has good mechanical properties. The heat-treating process changes the structure of the wood making it more porous meaning that it is good for insulation. In addition to this, it has increased longevity and is environmentally friendly. It has a lower bending strength than untreated wood due to the structural changes however, the nail and screw retention is similar to that of untreated wood. It is also relatively hard.
In terms of seasoning, there is minimum movement in service. This is because the heat treating process dries out the wood and removes the resin moisture. This means it won’t react to changes in humidity and will retain its shape.
Thermowood is extremely durable and accepts stains very well. Non-ferrous or galvanised metals should be used. The wood is resistant to rot and fungi due to the lack of moisture from the heat-treating process.
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