ThermoWood is an environmental friendly choice. No chemicals are used in the treatment process and wood itself is a renewable material. Disposal of off-cuts can be by burning or into normal waste system.

During the ThermoWood process the wood takes on a hardwood-like brown colour consistent through the entire section of each timber piece. Higher temperatures produce a darker shade. If the product’s appearance and colour is to be maintained, it should be surface treated. It has a warm, attractive appearance which can be left to turn to a natural grey colour, however some form of surface coating (coloured paints or translucent stains) is recommended to lengthen the service life by slowing down the natural weathering effect.

Dimensional stability
The ThermoWood process greatly reduces wood’s tendencies to warp, swell or shrink in different humidity conditions. The wood’s equilibrium moisture balance may be decreased to less than 40-50% compared to untreated timber. ThermoWood maintains its dimensional stability when exposed to variances of humidity. A stable substrate is far better when using surface coatings.

Natural rot resistance/durable
Wood species are divided into five classes according to their durability. ThermoWood D (212°C/414°F temperature treatment) is found in the natural durability class 2 together with e.g. Red Cedar, Meranti and Oak. ThermoWood S (190°C/374°F temperature treatment) in the moderate durability class 3 e.g. Siberian Larch heartwood, Douglas Fir heartwood and Mahogany. The Thermal modification of wood significantly improves its resistance to rot and fungal decay. The process ensures that all the material is treated and not just the surfaces. ThermoWood is not resistant to termites but is resistant to long horn beetles.

Thermal properties
The tests have shown that the thermal conductivity of ThermoWood is considerably  lower compared to untreated wood, thus giving improved insulation performance.