Thermo-Treated Timber Decking

Greener Thermo-Treated Timber Decking for Eco-Friendly Homes

Are you concerned about the environmental impact of your home improvement projects? Many homeowners today are seeking sustainable and eco-friendly alternatives to traditional decking materials, which often involve chemical treatments and non-renewable resources. However, our thermo-treated timber is not only long-lasting, it’s environmentally responsible.

Find Sustainable Thermo-Treated Timber Decking


About Our Thermo-Treated Range of Timber Decks

Our thermo-treated timber decking stands out for its innovative treatment process, where timber is heated to high temperatures without the use of any chemicals. This process enhances the wood’s durability and stability whilst giving it a rich, dark finish and outstanding grain detail. The boards also come pre-grooved for use with PaCS® Clip-Strips, ensuring a flawless and durable deck with minimal installation time and no visible screws.

Hand-Picked Hardwoods

Our thermo-treated decking boards are available in a range of hardwood types. The high-quality Scots pine, boasts a beautiful golden-brown colour and distinct knots, offering unbeatable durability and stability. The thermo-treated ash decking, harvested from well-managed forests in North America, is known for its deep, rich colour and class 1 durability, comparable to hardwoods like Ipe and Teak.

All the timber used to make our decking boards has been sourced from sustainably managed forests in Finland, Russia, and North America. These forests are carefully regulated to maintain ecological balance and promote biodiversity. By choosing FSC-certified Thermory decking, you are supporting responsible forestry practices that help conserve natural habitats and reduce the carbon footprint associated with timber production.

Pine Decking D45J - 118 x 26 mm

Chemical-Free Treatment

Thermo-treated timber decking undergoes a unique thermal-treatment process, where timber is heated to temperatures up to 215°C without the use of any chemicals. This intense heat treatment modifies the wood at a molecular level, enhancing its stability and durability. 

The process removes resin and reduces moisture content, resulting in timber that is resistant to decay, insect attack, and warping. This chemical-free approach makes the decking safer for your family and pets and free from harmful substances often found in traditional decking materials.

Thermory® Benchmark Thermo Ash C7J 72mm x 20mm

Take a Closer Look at the Thermory Range

Ash Decking D34 - 130 x 26 mm


Ash D34 timber decking boards are renowned for their exceptional durability and striking appearance, featuring rebated edges for use with TENI Clips, allowing for a seamless, screw-free surface that is both visually appealing and easy to maintain. Perfect for roof terraces due to its lighter weight compared to other hardwoods, Thermory Ash D34 is a top choice for homeowners seeking a durable, beautiful, and environmentally friendly decking solution.

Ash Decking D45J 118 x 21 mm


Like the D34, these boards are cut from sustainably harvested ash and subjected to the same rigorous thermo-treatment process. The result is a decking material with class 1 durability credentials, comparable to premium hardwoods such as Ipe and Teak. The D45J profile is pre-grooved for use with PaCS® Clip-Strips, ensuring quick and easy installation with no visible screws. With its rich, dark finish and exceptional grain detail, Thermory Ash D45J adds a touch of elegance to any outdoor space, making it an excellent choice for discerning homeowners.

THERMORY® Pine D45J 118 x 26mm

Pine D45J timber decking boards redefine expectations for softwood decking. Cut from high-quality Scots pine and thermo-treated to achieve maximum stability and durability, these boards feature a beautiful golden-brown colour and distinct knots. Ideal for those who prefer the natural beauty of pine with the enhanced performance of thermo-treated timber, Thermory Pine D45J offers an eco-friendly and aesthetically pleasing decking option.


“Great product at a reasonable price, more importantly, it’s made in the UK!”

Yellow Balau smooth/reeded 90 x 19mm

More Reasons to Choose Round Wood Timber Decking

With over three decades of experience, Round Wood of Mayfield has established itself as a leader in high-quality timber products. 

Our commitment to excellence is evident in every product we offer, from our meticulously crafted oak-framed buildings to our innovative decking solutions. We combine traditional craftsmanship with modern techniques to make sure you receive the finest timber decking boards, providing both beauty and durability to your outdoor space.

Millboard Decking Enhanced Grain Antique Oak

Sustainable Design You Can Trust

Beyond sourcing timber from FSC-certified forests and relying on an entirely chemical-free process, we implement a range of eco-friendly practices to minimise our environmental impact. For example, we have invested in technology to reduce timber waste to zero, with all offcuts and sawdust being repurposed into wood fuel or utilised in our bio-mass unit to power our kilns and heating systems.

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Thermo-Treated Timber – Choose the Greener Alternative

Choosing us means investing in premium quality products and supporting a company dedicated to sustainable practices and responsible forestry. Our continuous commitment to the environment and quality craftsmanship ensures that you receive products that align with your values and contribute to a greener future.

Contact us today for a free quote and let our experienced team help you create a stunning, long-lasting timber deck that you can enjoy for years to come.