WoodBlocX walls are built with many individual pieces of timber (rather like bricks), that are pinned together using plastic dowels. Each piece of timber – selected to use only the strongest parts of the tree and never the heart – is then pressure treated twice, and because they are pre-drilled, the treatment penetrates almost 100% of the wood. A WoodBlocX wall can be expected to last for at least 15 years, probably more.