Terracotta clay roof tiles are attractive, impermeable and durable.Terracotta is a natural material, made from clay that is fired at a high temperature until it vitrifies or fuses. Vitrification creates a hard, waterproof surface that withstands rain, snow, cycles of freezing and thawing and wears well in coastal areas with salt air.They are fireproof, last up to 100 years or more and are almost maintenance-free. Because they are made from clay.It a useful commodity for indoor and outdoor use.