Accoya is a modified solid wood which performs even better than tropical hardwoods such as sapele or mahogany. It is plantation-grown in sustainably harvested woodlands. Once harvested, the timber goes through a modification process called acetylation. The wood reacts with acetic acid, changing its structure permanently. This is an environmentally friendly process – vinegar, after all, is just dilute acetic acid! After the reaction has taken place, moisture can no longer get in or out of the wood, meaning that it has become incredibly stable and durable – perfect for doors and doorframes.
We never use softwoods such as European Redwood, because this is unstable and would have to be treated with a toxic biocide to make it appropriately durable. We much prefer to pick high-quality timbers with excellent natural properties in terms of strength and durability.