Maintenance and recommendations

Maintenance and recommendations

The sun’s ultra violet rays affect all wood, including heat treated wood. In order to preserve the golden brown colour the wood should be protected by waterproofing or by treating it with pigmented oil.

If one chooses not to treat the wood against the sun’s rays the colour will slowly change to a beautiful silver grey tone.

One can treat the wood oneself or have a professional do it. Treating the wood in one of these ways will also make it more resistant to dirt and mildew. Mildew can grow on any surface that is damp and contains nutrients which is why it is recommended that the wood be treated against mildew if it used in damp environments.

Industrial treatment

If one wants the Thermowood to be professionally treated before delivery we use Teknos Aqua 1703 in order to preserve the golden brown tone. If the silver grey tone is preferred the Thermowood can be treated with Sioo waterproofing.

Treating the wood at home

If one prefers to treat the Thermowood oneself any pigmented oil can be used. One can also purchase the eco-labelled Sioo waterproofing (dual components) and apply it with a brush or a sprayer.


If needed, Thermowood can be cleaned with a gentle cleaning product such as liquid soap. If the wood is very dirty one can use a pressure washer, but this should be done with caution. It is highly unusual that the wood turns blotchy, however should this happen it can be sanded in order for it to regain its original appearance.