Thermowood is a thermal modification procedure that preserves wood in its most natural and flawless state for a life-long journey.

The first heat treated wood was produced in the 1930s by German scientists Stamm and Hansen and in the 1940s by American scientist White. Research was continued in the 1950s by Bavendam, Runkel and Buro. In the early 90s VTT (Technical Research Center of Finland) further refined the research into heat treatment, and developed Thermowood method.

“Thermowood method” involves heating wood material to temperatures of up to 180⁰C and preserving it with steam. Besides the preservation, Thermowood process also causes certain chemical changes in wood.

The color of the Thermowood changes due to caramelization of glucose inside the wood, while its stability, decay resistance and insulation increase. Bending and swelling characteristics of the material are also greatly decreased.

Thermowood method, brand and logo can only by the used by members of the International Thermowood Association.

Thermowood Heat Treatment can be divided into three phases:

Phase 1: Drying; Temperature of wood is rapidly raised to 100°C.

Following this rapid heating, temperature is increased steadily to 130°C, the wood is dried, and its moisture content is reduced to zero.

Phase 2: Heat Treatment; Temperature is increased to 180°C (for Thermo S) or to 212°C (for Thermo D) using steam.

After the target level is reached, temperature remains constant for 2 to 3 hours.

Phase 3: Cooling and Conditioning; In the final stage, temperature is reduced to 80-90°C by water spray.

This process continues until the moisture content reaches 4 to 6%.



The products treated with the Thermowood method are;

·     100% natural. The wood is free from resin and chemicals. No chemicals are used during the production process.
·     Ecological. Thermowood products contain no environmental or health hazards. They are produced from renewable forests, are environmentally friendly, sanitary, recyclable and durable.
·     Durable. Thanks to its low water absorption, Thermowood maintains its durability in all weather conditions. It is longer lasting than regular wood. Low moisture content also prevents decay and fungi growth.
·     Stable. Thermowood’s bending and twisting characteristics are reduced by %90, compared to ordinary wood.
·     Uniform. Heat treatment turns the wood into an uniform color. Compared to regular wood, Thermowood also keeps its varnish and paint better.
·     Insulating. Thermowood provides 25% more heat and sound insulation compared to regular wood.
·     Safe. Thermowood is 30% more fire resistant than regular wood.
·     Insect-proof. Thermowood is completely protected from insects due to its low moisture content.



Heat treatment increases the stability and durability of wood.

Wood is composed of 50% cellulose, 23% hemicellulose, 20% lignin, and 7% other organic compounds, called extractives. Heat treatment removes resin, other extractives and their attached OH (Hydroxil) groups from the wood.

This process reduces water absorption of wood, consequently increasing decay resistance while decreasing swelling and shrinking. Another factor that contributes to the high durability of wood is the crystallization of cellulose. The change in hemicellulose increases the durability. Hemicellulose is separated into furfural and carboxylic acid. Caramelization of lignin, caused by heat, results in a darker color.

Thermowood Technical Data Sheet    ………. Download as Pdf. 
Thermowood Handbook    ………. Download as Pdf. 


Thermal Modification



Trees and wooden products have been with us since the dawn of mankind. From the moment we began making tools, wood is a natural and close friend for us.

Wood always stands out in our living spaces as a living material. From our tools to our houses, our gardens to cladding materials, wood has always been around us throughout our historical development.

Compared to most other materials, wood is much warmer and natural. We love wood, because, like us, it is alive. When cared of, it lives for a long time, and when you touch it, it tells you its stories.

We believe that wood has a memory. A living, growing memory that ages as people do. Wouldn’t you want your home to be memorable?

You have many options to build your living space, and your choice will reveal the character of your life style. This choice will become a feeling you shape into your life.

Wood is Nature. Thermowood is durability. Novawood is quality.

Why Wood?

Because wood is;

·      Natural
·      Environmentally friendly
·      Recyclable
·      Preserveable
·      Sanitary
·      Sustainable
·      Used for as long as mankind existed

Why Thermowood?

Novawood products are made of 100% natural wood heat treated to exceed regular wood in all qualities.

Thanks to its durability and stability, it is the best alternative for outdoor use.

Their unique colors, shape and texture set novathermowood products apart.

There are many reasons to use novathermowood products:

·      Made of %100 natural wood
·      Features the same characteristics as wood
·      Free from the problems affecting regular wood in time
·      Durable
·      Contains no chemicals
·      Feature maximized dimensional stability
·      Healthy
·      Adds value to life
·      Long lasting

novathermowood products are designed to let you live the life you feel.

Technical Documentation Sheets
Thermowood Technical Specifications
Thermowood processing in Technical Specifications … Download
Thermowood Handbook
You can find all detailed information about Thermowood in Thermowood Handbook PDF prepared by International Thermowood Association. … Download
Deck Solutions - Clips System
Novathermowood Decking is made of 100% natural, solid wood with unique characteristics. … Download
Cladding Solutions
Novathermowood Cladding is made of 100% natural, solid wood with unique characteristics. … Download
In contrast to many construction materials. Wood can be easily maintained, another of its defining characteristics. Even years after installation, wooden cladding and decking can regain their former beauty, without added investment. … Download