EN 350
Biological Durability
Per EN 350, Thermo-D holds a biological durability class and delivers long-lasting performance in exterior applications.
Thermowood · Thermal modification · ITWA licensed
What is Thermowood?
No. 01What is Thermowood?
A natural process that gives wood a new lifetime — using only heat and steam.
Thermowood is wood modified at 190–212°C in an oxygen-free environment with steam. The process patented by Finland's VTT Technical Research Centre permanently changes the wood's cell structure: hemicellulose breaks down, hydroxyl groups are removed, lignin caramelizes. The result: 50–90% less moisture movement, 25–30 year outdoor service life, deep caramel color — without a single chemical.
Two classes serve different needs: Thermo-S (190°C) for indoor stability, Thermo-D (212°C) for outdoor durability.
No. 02The Process
Three phases.
Zero chemicals.
ThermoWood® is a registered process by the International ThermoWood Association (ITWA), licensed and audited. Every batch produced at Novawood follows VTT-Finland specifications, with parameters logged from each kiln cycle.
ITWA LicensedVTT Finland Patent
PHASE 01
High-temperature drying
The kiln is rapidly heated up to 100°C. The temperature is then gradually raised to 130°C. During this process the wood is dried and its moisture content reduced to zero.
PHASE 02
Heat treatment
Inside the wood, the temperature is raised with steam to 180°C (Thermo S) and 212°C (Thermo D). Once the target temperature is reached, it is held for 2–3 hours.
PHASE 03
Cooling and moisturizing
In the final stage, a water-spray system lowers the wood temperature to 80°C – 90°C and continues until the wood's moisture reaches 4–6%.
No. 03Applications
From facade to sauna.
No. 04Standards & Certifications
Tested. Audited. Certified.
Every Novawood product is produced and tested according to European standards. Certificate copies are available on request.
EN 335
Use Class 3
Thermo-D is suitable for applications that are not in ground contact and are exposed to outdoor weather conditions.
ThermoWood® Standard
Thermal Modification Process
Produced with a controlled heat-and-steam process; durability and stability are increased without chemical preservatives.
ITWA
ThermoWood® Licensed Production
ThermoWood® production is carried out by ITWA member licensed manufacturers in line with quality standards.
FSC® / PEFC™
Responsible Forest Sources
The wood raw material is sourced from sustainable and traceable forest resources.
Thermo-D & Thermo-S
Product Classification
Classified as Thermo-S and Thermo-D; Thermo-D is developed specifically for exterior applications.
→ Certificate PDFs available on request. Contact our technical team for project-specific documentation.
No. 05Why Novawood Thermowood?
Natural Wood That Defies Time
01
Sustainability
Sourced from sustainable forests with a low carbon footprint; 100% recyclable.
02
Dimensional Stability
A low moisture balance keeps swelling and shrinkage to a minimum; the form holds for years.
03
Superior Quality
Produced to high quality standards; delivers reliable solutions in durability and performance.
04
21 Years of Experience
Turkey's first ThermoWood® producer since 2005.
05
80+ Countries
Regular export to 80+ countries — world-class quality, on-time delivery and professional export management.
06
45,000 m³ Annually
Annual production capacity sized for large architectural projects; with high quality and consistent output.