Roof components are materials used to cover the exterior of a roof. Shingles, which are made of asphalt, wood, or composite materials, are one of the most common roof components. They are typically rectangular in shape and overlap each other to form a waterproof barrier. Tiles, which are made of clay, concrete, or metal, are another type of roof component. They are usually flat and interlock with each other to provide a strong and durable roof covering.