/\ /\ . Shou-sugi-ban is the ancient Japanese art of burning Sugi, or Japanese Cypress, for exterior siding. This textured charcoal finish is accomplished by burning for 7 minutes, extinguishing in cold water, scrubbing with wire brushes, drying, then rubbing with natural oils to coat and preserve the finish. This technique is said to protect the siding from weather, pests and rot for 80 years. And looks fabulous!