Roof covering is an important part of any building, as it provides protection from the elements. There are a variety of materials that can be used for roof covering, including THATCH (6 letters), TILE (4 letters), TAR (3 letters), and epi (3 letters). THATCH is a traditional material made from dried vegetation such as straw, reeds, or grasses. TILE is a durable material made from clay or concrete, and is often used in Mediterranean-style buildings. TAR is a waterproof material made from coal, wood, or petroleum, and is often used on flat roofs. Epi is a synthetic material made from polymers, and is often used in modern buildings.