Masswood manufactures Accoya® decking to precise project requirements, supporting architects, builders and designers across Australia. Accoya is modified timber created through an acetylation process that dramatically improves dimensional stability and resistance to rot and decay. Combined with Masswood’s unique splayed profile and technical guidance, the result is timber decking that is correctly specified and built to perform reliably in Australia’s often harsh outdoor environments.
Accoya decking is a high‑performance timber that is engineered specifically for demanding outdoor environments. Through an advanced modification process, the wood is permanently altered at the cellular level. This dramatically improves its stability, durability, and moisture resistance, ensuring it performs consistently in Australia’s notoriously harsh conditions while maintaining the beauty and tactile appeal of real wood.
Accoya is produced using a patented acetylation process that modifies the timber at a molecular level. Unlike conventional timber, the altered cell structure resists water uptake. The result is modified wood that performs very differently from traditional decking materials.
Accoya boards move far less during wet and dry cycles, resist rot and decay, and maintain their shape and integrity over time. For decking applications, this means the boards will stay flatter, resist splitting and warping, and remain comfortable and smooth underfoot.
Outdoor environments place constant stress on decking timber through exposure to sunlight, moisture, temperature changes, and heavy foot traffic. Accoya decking is engineered to remain stable and durable across these demanding conditions, making it suitable for a wide range of architectural and landscape applications.
Create outdoor spaces that remain beautiful and comfortable. Enjoy the natural warmth of timber without the movement, cracking, or warping common in everyday residential environments.
Accoya performs exceptionally well in wet areas. Its stability and moisture resistance maintain smooth, safe, and comfortable surfaces underfoot.
Sun‑exposed terraces demand materials that can withstand heat, wind, and wet weather. Accoya’s stability maintains consistent board alignment and clean architectural lines.
Accoya delivers durability and visual quality for high-traffic public spaces, cafés, and hotels where performance and aesthetics both matter.
Exceptional resistance to moisture and decay makes Accoya highly suitable for boardwalks and waterfront structures exposed to harsh environments.
Selecting Accoya is only the starting point. Long‑term performance depends on how the timber is profiled, detailed, and installed. Masswood bridges the gap between material performance and buildable construction.
We work closely with project teams to ensure your decking is machined accurately, specified correctly, and delivered ready for efficient installation. As an approved Accoya Manufacturer, we provide both the material and the technical support required to help projects perform as intended.
Accoya decking provides the natural texture and grain of real timber while allowing flexibility in how the final surface is expressed. Designers can choose to allow the timber to weather naturally or apply finishes that enhance colour and protect the surface.
Left unfinished, Accoya gradually weathers to a refined silver‑grey patina over time, favoured in architectural projects where timber is allowed to develop natural character. It can be finished your desired protective coating.
Accoya Grey provides a contemporary architectural tone from day one. The colour is infused throughout the timber, ensuring visual consistency even after cutting or long‑term wear.
For a controlled colour outcome, we use WOCA exterior oil systems. These finishes enhance the grain and provide additional protection against weathering and UV exposure.
Masswood supplies boards with precise tolerances and consistent profiles so that decks install efficiently and maintain clean architectural lines.
Typical profile configuration:
Masswood can also machine Accoya decking to custom dimensions or profiles, as required, allowing architects and builders to match the project’s design intent while maintaining correct installation performance.
| Size | Finish |
| 70mm x 19mm | Smooth or Textured |
| 140mm x 19mm | Smooth or Textured |
| Standard | 2400mm – 4800mm |
| Finger Jointed | 4800mm – 7200mm + |
When selecting decking materials, architects and builders often compare natural hardwood, composite decking and modified timber. Accoya offers a balance of natural timber aesthetics with significantly improved stability and durability.
Hardwood moves significantly with changes in moisture, leading to warping and inconsistent gaps. Accoya’s modification process reduces moisture uptake and maintains stability through seasonal weather cycles.
Composite decking is stable but lacks the natural texture and authenticity of real timber. Accoya retains the warmth of wood while matching the performance of engineered alternatives.
For projects that require both architectural quality and dependable long‑term performance, Accoya decking provides a compelling alternative to conventional decking materials.
Masswood is proud to be an approved manufacturer of Glulam made of Accoya wood, and we are certified by Accsys to manufacture with Accoya wood and provide Accoya solutions.
After decades of research and development, a revolutionary scientific process called acetylation gives Accoya radiata pine unmatched advantages and benefits that exceed hardwoods and other materials such as PVC and aluminium.
The Masswood team go above and beyond to deliver exceptional Accoya solutions. We choose to use Accoya because it sets the new standard for wood performance in every way.
Correct installation is essential to ensure the long‑term performance of Accoya decking. While the material offers exceptional stability, good deck design still requires correct detailing, ventilation and fixing systems. Masswood provides installation guidance and technical documentation for project teams. Detailed resources are available in the Accoya decking installation guide, helping ensure decks are constructed correctly and perform reliably over time.
Accoya was one of the first building products to achieve a Gold Cradle to Cradle Certification. Cradle to Cradle Certified® is the global standard that leading brands use to verify that their products are safe, resource-efficient, and responsibly made. Masswood holds independent PEFC Chain of Custody certification.
Key sustainability attributes include:
Together, Accoya and Masswood support building projects that prioritise longevity, responsible materials, and architectural quality.
Explore the broader range, including Accoya cladding and Accoya battens.
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Accoya timber undergoes an acetylation process that modifies the wood at a molecular level. This significantly reduces moisture absorption, resulting in far greater dimensional stability, durability, and resistance to decay than conventional timber decking.
Accoya is engineered to move far less than traditional decking timbers. Its reduced moisture uptake helps boards remain stable through wet and dry cycles, minimising warping, swelling, and shrinkage.
Yes. When installed using appropriate stainless steel fixings and correct detailing, Accoya performs exceptionally well in coastal and high‑moisture environments.
No, Accoya can be left to weather naturally to a silver-grey patina. However, it can be finished with oils or coatings (like WOCA) if a specific colour outcome is desired.
Accoya timber offers exceptional durability and is designed for long‑term exterior use, making it suitable for the most demanding residential and commercial environments.
Consider your deck’s environment, including its exposure to sun, moisture, and pests. Is your deck by the coast? In a forested area? Exposed to snow in the winter? Choose a material that can handle the specific conditions it will face.
Over time, durability becomes essential. Opt for materials that resist fading, rot, insects, warping, and cracking to ensure your deck remains in great shape for years.
High upkeep can be a deal-breaker for many. If you’d rather spend time enjoying your deck than maintaining it, look for materials that are low maintenance, so you can avoid tasks like cleaning, sealing, and staining every season.
In case you need to replace a plank down the road, consider how easy it will be to find matching materials. Accessibility of replacement boards can save you future headaches.
If your deck gets direct sun, you’ll want to make sure the material doesn’t overheat. For bare feet comfort, pick a material that stays cool in the sun.
Appearance matters. Select a material that fits the style you want, whether it’s the color, grain, or texture, as well as the size and pattern of the boards.
While ease of installation may seem relevant only if you’re doing it yourself, professional installation costs can also vary depending on the material chosen, potentially impacting your overall budget.
More and more, people are choosing eco-friendly options. If sustainability is important to you, look for materials that are responsibly sourced and have a lower environmental impact.
Keep in mind that the total cost includes more than just the initial material price. Factor in installation and ongoing maintenance costs, such as resealing or staining, which can add up over time.
It may seem like a minor detail, but a good warranty can be invaluable if problems arise. Be sure to check what’s covered before making your final choice.
At Masswood, we’re passionate about using and delivering products that offer contemporary, state-of-the-art, and sustainable design solutions. Contact us to discover timber’s true potential.
