Acetylated timber with exceptional durability and dimensional stability for demanding architectural applications across Europe. The Accoya® material carries its manufacturer's warranty of up to 50 years above ground. We use this material as a high-performance base for creating Shou Sugi Ban.
Accoya wood undergoes a proprietary acetylation process that permanently modifies the wood's cellular structure, resulting in exceptional performance characteristics unmatched by traditional timber.
Achieves Class 1 durability rating (equivalent to teak) with natural resistance to rot, decay, fungi and insect attack. Guaranteed for 50 years above ground.
75% more stable than untreated wood, with significantly reduced swelling and shrinking in changing humidity conditions. Minimal movement in service.
The Accoya® material is Cradle to Cradle Certified® Gold, and no biocides are used in acetylation. Life-cycle data is in the manufacturer's EPD.
Accoya wood is the material of choice for architects and builders seeking premium performance in challenging environments across diverse European climates.
Detailed technical information for architects, engineers, and specifiers to ensure optimal project outcomes with Accoya wood.
Explore inspiring applications of Accoya wood in visionary architectural projects across Europe and beyond.
Contemporary office building featuring Accoya vertical cladding with integrated ventilation system in Amsterdam
Luxury residential terrace in Switzerland with Accoya decking system, featuring hidden fasteners and custom finishes
Historic building restoration in Vienna featuring custom-designed Accoya windows with authentic period details
Common questions about Accoya wood technology, applications, and specifications for architectural projects.
Accoya® is made by acetylation, which modifies the wood's cell walls throughout the board, not just at the surface. According to its manufacturer, the result is Durability Class 1 timber (comparable to teak) that swells and shrinks up to 75% less than untreated wood, with a warranty of up to 50 years above ground. No biocides are used in the process.
Yes, Accoya has a 25-year warranty for ground contact applications and is ideal for decking posts, fencing, and landscaping features. For full ground burial, we recommend consulting with our technical team for specific project requirements.
Accoya accepts all standard wood finishes exceptionally well. For exterior applications, we recommend high-quality opaque or semi-transparent coatings. For interior use, oils, varnishes, and stains all perform excellently. The wood's stability means finishes last longer without cracking or peeling.
The Accoya® material is Cradle to Cradle Certified® Gold, and its manufacturer Accsys publishes an Environmental Product Declaration (EPD) with life-cycle data. We can send you the current certificate and EPD with your quote.
Accoya can be left uncoated to weather naturally to a beautiful silver-grey. However, if you wish to maintain its original appearance or choose a specific color, it takes coatings exceptionally well. Because it doesn't shrink or swell, paint and stains last 2–3 times longer on Accoya than on traditional timbers.
Yes. Accoya is comparable to a soft hardwood in terms of workability. It can be machined, planed, and sanded using standard woodworking tools. Due to its superior stability, it remains flat and easy to handle throughout the manufacturing and installation process.
Request technical specifications, material samples, or schedule a consultation with our Accoya specialists. We serve architects, builders, and designers across Europe.
Quick sample requests for specific applications: