Kebony and Accoya are both innovative, sustainable real wood decking options that provide excellent durability and environmental benefits, but they differ in their materials and treatment processes.

How is Kebony and Accoya made?

Kebony is produced from softwood species like pine or spruce, which are treated through a special, exclusive process involving heat, pressure, and natural resins. This treatment chemically and physically changes the wood, making it more durable and resistant to decay, similar to hardwoods. The process combines thermal modification (heating the wood to alter its structure) and bio-based impregnation (introducing environmentally friendly resins into the wood), resulting in a product that looks and performs like hardwood. Essentially, Kebony’s manufacturing method improves the strength, longevity, and appearance of the softwood, making it suitable for outdoor use such as decking.

Accoya’s manufacturing process involves a precise chemical treatment called acetylation. In this process, FSC-certified softwood, usually radiata pine, is first prepared and dried to an optimal moisture content. The wood then undergoes a high-temperature treatment in a sealed chamber where acetic anhydride vapor is introduced. This chemical reacts with the wood’s cellular structure, replacing the hydroxyl groups in the wood with acetyl groups. This chemical modification reduces the wood’s ability to absorb water, making it highly resistant to swelling, shrinking, rot, and insect attack. After acetylation, the wood is thoroughly dried and undergoes quality checks before being cut, finished, and shipped as durable, stable decking material or for other outdoor applications. The entire process is designed to produce a long-lasting, environmentally friendly, and low-maintenance wood product.

Both options are environmentally friendly, with Kebony using sustainable softwoods treated in an eco-conscious manner, while Accoya employs non-toxic, FSC-certified timber with a focus on long-term sustainability. In terms of aesthetics, Kebony tends to develop a rich, warm color over time, whereas Accoya has a lighter initial appearance that can be stained or finished as desired. Though both are premium choices, Accoya generally commands a higher price point due to its exceptional stability and performance, especially in challenging outdoor environments. Ultimately, selecting between the two depends on specific project needs, aesthetic preferences, and budget considerations.

Lifespan of Accoya and Kebony decking:

Accoya decking typically has a lifespan of 50 years or more when properly installed and maintained, especially in challenging outdoor environments. Its acetylation process provides exceptional resistance to rot, insects, and moisture, making it suitable for long-term use.

Kebony decking generally lasts around 20 to 30 years under normal outdoor conditions with appropriate maintenance. Its bio-based modification ensures high durability and resistance to decay, though it may require periodic sealing or finishing to maximize longevity.

Both options are considered sustainable and long-lasting choices, with Accoya often boasting a longer life expectancy due to its superior dimensional stability and rot resistance.

Less likely to Warp and Twist than treated lumber:
Accoya and Kebony outperform traditional treated lumber in resisting warping and twisting. Accoya, with its high dimensional stability resulting from the acetylation process, significantly reduces movement caused by moisture changes, making it one of the most stable woods available for outdoor use. Kebony also offers excellent resistance to warping and twisting, thanks to its bio-based modification, which enhances dimensional stability. In comparison, treated lumber, such as pressure-treated pine, is more prone to warping, twisting, and movement over time due to less advanced modification and lower stability, especially when exposed to varying weather conditions. Overall, both Accoya and Kebony provide a much more stable decking option, helping maintain a smooth, even surface for extended periods, which treated lumber often struggles to achieve without frequent maintenance.

Finishing of Accoya and Kebony:

When comparing decking finishes, Accoya generally offers a superior finish due to its higher dimensional stability and consistent surface, which makes it easier to apply staining, oils, or sealants evenly. Its chemical treatment provides a smooth, stable surface that resists warping, twisting, and movement, helping finishes adhere better and last longer. Kebony also accepts finishes well, but because it can deepen in color and develop surface variations over time, it may require more maintenance to keep a uniform appearance. Overall, Accoya tends to provide a more consistent and durable finish, especially in demanding outdoor conditions.

How do these 2 deckings compare?

  • Material: Kebony from softwood; Accoya from radiata pine.
  • Treatment: Kebony uses bio-based modification; Accoya uses acetylation.
  • Durability: Both are highly durable; Accoya offers superior dimensional stability.
  • Environmental impact: Both are eco-friendly; Kebony with sustainable softwood, Accoya with FSC-certified wood.
  • Aesthetics: Kebony develops a deep, rich color; Accoya is lighter and customizable.
  • Cost: Accoya tends to be more expensive.
  • Best use: Kebony for hardwood-like look and feel; Accoya for maximum stability in harsh conditions.