Heat treated Redwood pine.
No Chemicals are used to make the timber resistant to rot.
Surface treatment is not essential.
30 year UK service life
It has been known for centuries that burning the surface of wood in open fire will make it more durable in exterior use.
Even the Vikings used this method in outdoor structures such as fences.
Thermowood is manufactured using a method developed by VTT in finland. The timber is heated to a temperature of at least 180 degrees Celsius while it is protected with steam. Besides providing protection, the steam also affects the chemical changes taking place in the timber. As a result of the treatment, environmentally friendly Thermowood is created. Its colour darkens, it is more stable than normal timber in conditions of changing humidity, and its thermal insulation properties are improved. If carried out at a sufficiently high temperature, treatment also makes the wood resistant to decay. On the other hand, this has a decrease in the bending strength.