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What is Thermally Modified Timber

The first documented instance of thermally modified timber was in 1915 when a kiln expert heated air-dried wood in superheated steam at 150°C.
The modified timber was found to absorb less water than untreated timber.
Since then, thermal modification has remained a staple in the timber production process, providing a range of cladding benefits.

Understanding the Thermal Modification Process

Enhancements and Environmental Benefits

Enhanced Durability

Thermally modified timber is less susceptible to decay caused by fungi and insects. It is also more resistant to the effects of moisture and weathering, extending the lifespan of the wood when used in exterior applications.

Dimensional Stability

The treatment process reduces the timber’s likelihood of warping, twisting or swelling due to changes in humidity and temperature.

Improved Aesthetics

The thermal modification process darkens the wood, giving it a rich, uniform color similar to that of tropical hardwoods. It can easily add visual appeal to both interior and exterior applications.

Environmental Benefits

Thermal modification is a chemical-free process. This makes thermally modified timber a more environmentally friendly option.

Versatile Applications

Due to its stability and aesthetic appeal, thermally modified timber is suitable for flooring, wall paneling, and furniture. Its enhanced durability makes it perfect for decking, cladding, and outdoor furniture.

Performance Characteristics

Reduced Hygroscopicity

The thermal modification process decreases the timber’s ability to absorb moisture (hygroscopicity), making it ideal for applications where stability is crucial.

Increased Insulation Properties

Thermally modified wood is more efficient at regulating temperature than untreated wood, as it has better thermal insulation.

Aesthetic Appeal

The treatment also  darkens and enhances the natural grain patterns of the wood, making it more visually appealing.

The Best Thermally Modified Timbers

Thermally Modified Hemlock

 

Thermally Modified Hemlock undergoes a natural, non-toxic process that removes organic compounds from the wood cells so it doesn’t absorb water, expand, contract or provide food for insects and fungi. It is extremely stable and weather resistant. 

Naturally light and uniform in colour, Thermally Modified Hemlock will accept any stain colours, making it adaptable for both interior and exterior applications. Because the thermal modification process reduces cupping and warping, this product is a dream to install and lays straight and flat. 

Thermally Modified Hemlock

Accoya

More than just good looks, Accoya is one of the world’s most favoured softwood species, renowned for its natural beauty and durability. Our range of innovative profiles offers unbeatable style, simple installation and incredible functionality. 

Accoya’s open cellular structure helps absorb and dissipate sound energy, making it effective in confining noise. In external applications, adding a metal resilient rail can improve its sound deflection capabilities. Thicker cladding profiles are also recommended.

Accoya

Article By   Joel Leitch

| 18 June 2024

Joel Leitch

Project Consultant

Joel is an integral team member of NSW projects division with over a decade as a consultant to architects and builders. With extensive experience as a head of projects, Joel Leitch combines deep knowledge of natural timber, aluminium, and concrete to provide innovative and inspiring design solutions.