Wooden stairs with waterproof processed wood Anti-wear processed wood (thermo wood) used in wooden stairs is a product that by performing processes including heat treatment (steam heating) causes the elimination of bacteria in the wood and also the bond. The components of the wood are better, in the next stage, with a gentle heat with a temperature of 119 degrees, the moisture in the wood is taken and then this temperature is increased to 180 to 215 degrees until the moisture in the wood reaches zero. In the thermowood process, all celluloses (sugar chains) are broken down due to the use of high heat, so the final product is completely natural and free of chemicals. Also, due to the release of food from the wood, the tendency of wood-eating insects to this type of wood is greatly reduced. The price of a prefabricated wooden staircase depends on the number of stair treads.