Made from clay, clay tiles are a roofing material that has been used in Japan since ancient times.
Tiles that are baked with a glaze applied are called ceramic tiles, while tiles that are baked without a glaze and smoked in the final stage to form a carbon film on the surface and give them a silvery finish are called "smoked tiles."
Like tiles used on exterior walls, the base material of clay tiles is ceramic, so they do not deteriorate or fade due to ultraviolet rays and do not need to be repainted.
Clay tiles have the longest lifespan of all roofing materials, at over 100 years.