Shou Sugi Ban is an ancient Japanese exterior siding technique that preserves wood by charring it. Traditionally, Sugi, or Japanese Cyprus, was used. Nowadays, designers and architects have used other species of wood like Douglas Fir, Cyprus, and Oak. The process involves charring the wood, cooling it, cleaning it, and finishing it with a natural oil. Although time consuming, the final product is not only gorgeous, with its rich, silvery finish; the charred wood also resists rot, insects, and fire and can last up to 80 years.