Accoya is modified timber in which a process called acetylation results in a product with greater stability and durability. The result is a softwood product that is well suited for external applications, such as joinery. You can find suppliers of Accoya in regions all over the globe. Whilst reducing the environmental impact and improving performance, this wood is guaranteed for 50 years above ground and 25 years in ground or freshwater. Accoya treated wood has been tested thoroughly to ensure optimal performance.