What is Thermally Modified Timber

Thermally modified timber (TMT) is wood that has been treated with heat and steam to improve its durability, stability, and resistance to decay. The thermal modification process involves heating the timber to high temperatures (usually between 160°C and 230°C) in a controlled environment with little to no oxygen to prevent the wood from burning. This treatment changes the chemical and physical properties of the wood, resulting in several benefits.

Enhanced Durability

The thermal modification process alters the chemical composition of the wood, making it less susceptible to decay caused by fungi and insects. Thermally modified timber has better resistance 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 wood’s ability to absorb water, leading to greater dimensional stability. This means that thermally modified timber is less likely to warp, twist, or swell with changes in humidity and temperature.

The wood’s reduced hygroscopicity (ability to absorb moisture from the air) ensures that it remains more stable over time, making it ideal for applications where stability is crucial.

Improved Aesthetics

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

The treatment can also enhance the natural grain patterns of the wood, making it more visually appealing.

Environmental Benefits

Unlike some chemical treatments used to improve wood durability, thermal modification is a chemical-free process. This makes thermally modified timber a more environmentally friendly option.

Thermally modified timber can be sourced from sustainable forests, contributing to more sustainable building practices.

Versatile Applicaitons

Due to its stability and aesthetic appeal, thermally modified timber is suitable for flooring, wall paneling, and furniture.

Its enhanced durability and resistance to decay make it ideal for decking, cladding, and outdoor furniture.

The best thermally modified timbers?

Thermally Modified Hemlock

Thermally Modified Hemlock undergoes a natural, non-toxic process that heats the timber. This process removes organic compounds from the wood cells so it will not absorb water, expand, contract or provide food for insects and Fungi. Thermally Modified hemlock is extremely stable and weather resistant. Naturally light and uniform in colour, Thermally Modified Hemlock will accept any stain colours which makes it totally customisable for both interior and exterior use. Because the thermal modification process reduces cupping and warping, this product is a dream to install and lays straight and flat. Thermally Modified Hemlock is 100% plantation timber and PEFC Certified. https://www.modinex.com.au/species/hemlock-thermally-modified-guide/


More than just good looks. Accoya is one of the world’s most unique softwood species, renowned for its natural beauty and durability. Our range of innovative profiles offers unbeatable style, streamlined simplicity and incredible functionality. Cedar Sales offers a range of ceiling and wall designs that are engineer-approved to meet various acoustic ratings. Accoya’s open cellular structure helps to absorb and dissipate sound energy, making it effective in confining noise. In external applications, Accoya’s sound deflection capabilities can be improved by adding a metal resilient rail. The use of thicker cladding profiles is also recommended. https://www.modinex.com.au/species/accoya/