Concrete tiles are made of varying proportions of Portland cement, sand and water which is mixed and extruded on molds under high pressure. The exposed surface of a tile may be finished with cement-related material colored with synthetic additives. The roof tiles are cured to reach the required strength. They generally have lugs on their undersides for anchoring to batten strips. There are additional waterlocks or interlocking ribs on the longitudinal edges that impede movement and prevent water infiltration.
As with clay tile, concrete tiles are available in a wide variety of profiles, styles, finishes and colors. Color may be added to the surface or dispersed throughout a tile. Special texture may be added in surface treatment. Each type of tile roof system may include ridge, hip, hip intersection, gable end and finial accessory tiles of various shapes.