Accoya wood is made by Accsys at its plant in Arnhem, in the Netherlands. Accsys transforms fast-growing, certified sustainable wood into Accoya wood through its proprietary acetylation process. The result is high performing sustainable lumber with sustainability credentials that exceed those of man-made, intensely resource depleting and heavily carbon-polluting alternatives. This gives the world the choice to build sustainably, offering new opportunities in sustainable building materials.
Brilliance for generations to come
Your exterior wood siding needs to weather any storm, in style. We know that aesthetics, low maintenance and durability are crucial. What you may not know is that Accoya out-performs even the most durable tropical hardwood siding. By combining superior stability and durability with the beauty of natural wood, you can achieve the look and the performance you want from your timber siding.
A unique acetylation process
Through a revolutionary scientific process called acetylation, Accoya modifies wood to give it properties above and beyond the very best hardwoods – and in many cases, aluminum and PVC.
Acetylation is the reaction of wood with acetic anhydride (concentrated acetic acid) at high temperature to precisely increase the level of moisture resistant acetyl groups. Wood cellulose contains a small number of naturally occurring acetyl groups which are hydrophobic (repel water). There are an insufficient number of acetyls in natural wood to provide durable, stable performance. Accoya Acetylated Wood therefore contains the same constituents as natural wood, just at enhanced levels. This delivers high performance through increasing dimensional stability and enhanced biological durability.
Accoya color gray and charred wood siding
Stylish gray wood siding can enhance any home but being outdoors, your siding needs to withstand the elements and stay looking as fresh as the day it was installed. There’s a lot of choice when it comes to choosing wood siding. Accoya Color Grey is an ultra-high performance siding product that combines the beauty and benefits of 100% real wood, but without the drawbacks. Colored through completely from surface to core, the gorgeous color gray delivers a premium look and siding that lasts.
Due to Accoya’s outstanding stability, the Japanese burnt wood siding process also works well. Shou Sugi Ban siding boards don’t twist, distort or warp when subjected to charring, making it ideal for ease of installation on a building site. Durability is not only enhanced when using Accoya but the charring prolongs any finish making it long lasting even with the additional stability of Accoya once in situ. An additional feature of Accoya, a solid wood, is that the grain is emphasized much more than any other timber due to how well the process chars Accoya. The process makes it an attractive timber for exterior siding and even internal feature walls.
Product benefits
Warranty: Accoya wood has an industry-leading warranty, giving you peace of mind and complete confidence for your beautiful Accoya siding.
Ideal for coating: Stay true to your vision with a range of finishes, including Shou Sugi Ban and custom board sizes and fixings. Left untreated, your exterior wood siding will weather naturally. But if you’d prefer to coat it, Accoya siding makes the ultimate surface.
Highly Stable: Resistant to rotting, Accoya siding is likely to stay free of any visible distortion over its lifetime. A cost-effective choice for lasting performance.
Non-toxic: Now you can meet the most demanding of planning requirements. Accoya wood siding is 100% non-toxic and contains no biocides or harmful chemicals. Each siding panel is made from FSC® certified timber that’s fully sustainable.
Tested stability
Leading timber research institute, BM Trada, tested Accoya stability against other widely used siding materials by cyclic exposure of coated boards to wet and ambient conditions. BM Trada found that Accoya has exceptional stability and using Accoya siding boards externally could increase from standard 150mm wide profiles to 200mm. This highlights the design flexibility and superior performance of Accoya compared to western red cedar, larch and thermally modified pine.
BM Trada was also commissioned for a series of exposure trials starting in February 2007 in Buckinghamshire, England. The trials used the same translucent black coating for maximum radiant heat build and tested resistance to natural weathering and splitting of Accoya siding board’s compared to pine and Siberian larch. After 3.5 years, Accoya was found to outperform in a number of ways. Pine siding showed severe levels of fissuring, resin exudation, end fissuring, paint peeling over fissures, shelling, surface checking and board distortion; whilst Siberian larch had extensive surface checking and burst resin pockets.
Accoya had a flat surface with no grain raising, virtually no shelling, cracking, checking or fissuring. External dirt was easily cleaned off revealing a sound clean surface with no coating issues. Proving Accoya has superior coating performance compared to many competing materials.
A trusted source
Since its launch in 2007, Accoya has been selected by hundreds of manufacturers as their wood of choice and used on some of the most architecturally significant projects in the world. But perhaps its most exciting application is in everyday homes, where it brings new possibilities for windows, doors, decking and siding.
Project References
Located on the edge of the Sydney Harbor, the curved plan form of the Barangaroo House creates a free-flowing space around the building. The striking facade is made of steam-bent charred timber, which is curved in three dimensions. Creating a strong visual identity for the building, the charred timber cladding conceals a ring of edible plants as well as cantilevered terrace and dining spaces that project outwards. 45 millimeters of Dowelled Accoya and 45 millimeters of Half Dowelled Accoya were laminated into a series of predetermined radii with Shou Sugi Ban (medium char) finish applied to create the striking charcoal appearance. To further enhance the project, a layer of ‘Anthractite’ a WOCA coating from Denmark was applied to compliment the overall design aesthetic. The Accoya wood cladding was then screw fixed to specially made aluminum anodized brackets to ensure dowels were evenly spaced across the structure.
Designed for concerts and international level sporting events, this new venue combines two key ambitions: to create an attractive and highly flexible multi-purpose arena that can attract spectators locally as well as internationally, while ensuring that the building’s presence will be a catalyzer for growth for the entire district as well as Copenhagen. With a podium that offers different public areas for social meetings and daily activities with a warm timber facade of Accoya cladding, spectators can look out and the curious can look in. The arena is designed to catalyze urban life, thereby adding value and fitting into the surrounding neighborhood.
Accoya was specified for the construction of a giant replica of Noah’s Ark in Williamstown, Kentucky in the United States, the country's largest free-standing timber structure. The wood was selected for its eco-friendly properties and high levels of stability and durability.
