Heat Treatment

WDE - Maspell S.r.l

Heat-treated wood, often referred to as Thermowood, is an eco-friendly, completely chemical-free alternative to pressure-treated wood. The heat treatment offers many benefits, such as making the wood more resistant to rot and fungi, increasing stability, reducing cracking, and providing better insulation.

This is how it works. The wood is heated to 214 degrees Celsius. The treatment is concluded before the wood carbonizes. The heat treatment alters the wood's chemical structure, thereby changing its properties. This process enhances several of these properties, such as stability, resistance to rot and fungi, and improved insulation values.

The result is wood that is golden brown throughout. If exposed to direct sunlight without any surface treatment, it gradually turns beautifully silver-gray. The finished product is ideal for outdoor applications such as wall panels, decks, doors, windows, fences, and outdoor furniture. With its golden-brown hue, it also suits indoor furniture, flooring, and wood paneling

What is heat-treated wood?

It has long been known that burnt wood has increased stability and is more resistant to rot and fungi. The Vikings already used to burn the wood they used for posts and when building ships to make it last longer. Unfortunately, it became dry and brittle from the burning process. A technique has now been developed to solve these problems.

Today's heat-treated wood offers many advantages, such as resistance to rot and fungi, increased stability, and being completely free of chemicals and heavy metals, to name just a few. The heat treatment can be applied to many types of wood.


The color

The color of the wood changes with temperature and exposure time. The higher the exposure temperature, the darker the wood becomes. The wood's color is uniform throughout the surface, both inside and outside.
Mass loss is the best indicator and guarantee of treatment intensity and is closely linked to thermal degradation.
The variation in equilibrium moisture content correlates with the exposure temperature.

The Color

The color of the wood changes with temperature and exposure time. The higher the exposure temperature, the darker the wood becomes. The color of the wood is uniform across the entire surface, both inside and out

Mass loss is the best indicator and guarantee of treatment intensity and is closely related to thermal degradation.

The variation in equilibrium moisture content correlates with the exposure temperature. 

Heat-treated wood can be used for, among other things:

  • Saunas
  • Hot Tubs
  • Beautiful, sustainable facades
  • Terraces
  • Stairs