Thermally Modified Timber, various species (19mm, 21mm, 25mm, 32mm)
Thermally modified timber (TMT) undergoes controlled high-temperature treatment (190-230 degC for Thermo-D class) in the absence of oxygen, using only heat and steam to fundamentally alter the wood's cellular structure. The process degrades hemicellulose — the cell wall component most responsible for moisture absorption — reducing equilibrium moisture content to 4-6% and delivering significantly improved dimensional stability and Class 1-2 durability (EN 350). No chemicals are used. Available species include Radiata Pine (Abodo Vulcan), Nordic Pine/Spruce (Lunawood, Thermory), and American White Ash (Burnt Ash). The process reduces mechanical strength by 10-30% and increases brittleness, but the trade-off delivers enhanced decay resistance, improved insulation (thermal conductivity reduced 20-25%), and a consistent dark brown colour across all boards.
- External cladding and facade systems
- Window and door components
- Decking and outdoor structures
- Interior millwork and paneling
- Bathroom and wet area applications
- Garden and landscape architecture
- Screening and privacy battens
- Commercial and residential millwork
Modern thermal modification of timber was developed in Finland in the 1990s by VTT Technical Research Centre, leading to the commercial ThermoWood process. The technique was patented and production began at scale in the early 2000s. The International ThermoWood Association (ITWA) was established to standardise the process and quality requirements. The technology expanded across Europe (Thermory in Estonia, Lunawood in Finland, Stora Enso) before reaching Australasia. Abodo Wood (New Zealand) adapted thermal modification for Radiata Pine, creating the Vulcan product range specifically for the Australian and New Zealand markets. The process has roots in traditional charring and smoking techniques used for centuries, but the controlled industrial process delivers far more consistent and predictable results. Australian adoption has accelerated since 2015 with multiple distributors establishing supply chains.
DISCLAIMER: This specification document is generated from the CLAD Materials Atlas Database. Information is for general guidance only and does not constitute professional engineering advice. Values are typical and may vary by batch, manufacturer, and production run. Verify suitability for specific project applications independently.