Our favorite material is Accoya, a durable, sustainably sourced softwood. We find it matches or exceeds the durability of the very best tropical hardwoods.
The Accoya wood production process takes sustainably-sourced, fast growing softwood and, in a non toxic process, creates a durable and stable wood.
The technology behind Accoya is based on acetylation, a process that has been studied around the world for more than 75 years. This method of improving wood has been proven to deliver such superior performance that it has long been used as the “gold standard” against which other methods are measured.
Acetylation effectively changes hydroxyls within the wood into acetyl groups. This is done by reacting the wood with acetic anhydride, which comes from acetic acid. When the hydroxyl group is transformed to an acetyl group, the ability of the wood to absorb water is greatly reduced, rendering the wood more dimensionally stable and, because it is no longer digestible, extremely durable.
This process is forced throughout the body of the wood, so when Accoya® wood is cut or jointed there are no exposed non-acetylated surfaces in any dimension. This completely negates the need to apply additional chemical preservatives on-site, as is necessary with unmodified or envelope-treated woods.