A word of explanation:
After being heated the structure of the wood's cells has been altered in such a way that they can no longer serve as a breeding ground for bacteria and insects and consequently cannot be destroyed by them.
This change to the wood is achieved by a change in temperature alone, without the use of chemicals.
Most native types of wood naturally belong to durability class 3 and lower.
So they are unsuitable for use outdoors without first being treated.
As a result of thermal modification, a European type of wood such as fir moves up into durability class 1.
That means unlimited use for exterior applications, even when in direct contact with the ground.
Garden fences and terraces will now last much longer than used to be possible.
And all this without the use of any chemicals.
Following construction of our outbuildings a fine mould may appear on the surface. This is a harmless surface mould that, in principle, can occur on any type of wood (particularly in dark, damp places without any ventilation).
Over time the wood will turn grey and the moulds will disappear because this type of mould lives on simple sugars and, after a while, this source of nourishment is exhausted.
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