Accsys is a chemical company focused on the production of Accoya® lumber through the acetylation process. Accoya® wood has been produced by Accsys continuously since 2007. Volume has grown each year it has been sold through a select group of distributors and selected partners in North America, and the world over. The acetylation of lumber was developed by the USDA Forest Products Lab, Madison WI during the 50’s to 90’s. Despite the performance potential, it proved very difficult to scale up; until Accsys developed Accoya®.


Imagine a solid wood that is sourced from fast-growing responsibly managed forests, has zero toxicity and provides dimensional stability and durability that exceeds even the best tropical hardwoods.

Imagine a wood that can replace increasingly scarce tropical hardwoods, treated woods and less sustainable materials in new and existing outdoor applications. Imagine a wood that will act as a better carbon sink during its extended life span and can be safely recycled at the end. Such a wood exists. It is Accoya®: the world’s leading high technology wood.

Spanning eight decades of research, Accoya® wood combines past and present scientific wood acetylation study with a proprietary production process to deliver reliable commercial-scale results.

In producing Accoya® wood, the chemical structure of the wood is modified from the surface to the core, providing a class leading durable and exceptionally stable product. Accoya® wood is fast becoming the material of choice for exterior applications and can be used for virtually anything, from windows to doors, decking to siding and siding, and even for applications which were once only feasible with non-sustainable materials.


Accoya® wood is suitable for siding and façades and is the ideal choice where aesthetics and less frequent maintenance are critical. The dimensional stability and durability of Accoya® wood confirms a decreased overall life cycle cost. The dimensional stability also provides for more design flexibility on board width, thickness, joints and coating colours including black. The durability provides for an exceptional service life.



In specifying decking, natural beauty, strength and all-weather performance are important. A lasting wood with outstanding performance characteristics and dimensional stability is desirable otherwise the wood and splinter or buckle and become a tripping hazard. It is also crucial that the wood is non-toxic and therefore safe for people and pets. Accoya® wood meets these requirements and complies with US Building code (see ICC ESR 2825).


Accoya® wood is naturally insulating and is more durable and dimensionally stable than other woods. This means windows do not swell when closed, doors continually open freely and shutters maintain their authentic beauty. Accoya® wood may be opaque, translucent or transparent coated, and its lower maintenance requirements increase its cost effectiveness.


Accoya® wood is perfect for tables, chairs, tree houses, play sets, planters and landscaping timbers because it is non-toxic and able to withstand the rigors of different weather conditions and lasts at least 25 years in ground contact.


Accoya® wood has been tested over prolonged periods in all types of weathering conditions – above ground, below ground and even in water for 20 years – and has been proven to withstand the toughest of external environments. The exceptional durability and dimensional stability mean that Accoya® wood requires significantly less maintenance, because paints and stains stay where they belong: on the wood. In fact, test results between Accoya® wood and unmodified wood constantly prove that film forming coatings last longer on Accoya® wood. Comprehensive use guides, certification documents, test reports and project examples can be found at


Taylors Joinery accoya Certificate