Abstract: An improved roofing tile with side flanges, one overlying and one underlying, providing an interlock between adjacent tiles. The flanges have two ridges and two grooves each. The inner ridge of the underlying flange is higher than the outer ridge thereof, and the outer groove of the overlying flange is deeper than the inner groove thereof. Optionally a cutout is provided on the overlying flange permitting a tile to be held with a hurricane clip on the underlying flange. Optionally a cavity is provided on the bottom face toward the lower edge to prevent a tile coming in contact with nails driven through tiles in a lower course.

Abstract: A flat shingle style concrete roofing tile adapted to be laid over an underlayment in a series of courses on a roof and secured to the roof by mechanical fasteners and a sealant is provided. The tile has thickened edges along the front, back and sides molded to the underside of the tile, the front edge and the front portion of the side edges forming a step of reduced thickness relative to the adjacent part of the side edge which is adapted to resist a tile in an upper course from sliding down an inclined roof when engaged with the course immediately below it. The rear portion of the side edges and the back edge being shaped so as to provide an extended bearing surface along the back edge and the rear portion of the side edges of the tile when the tiles are lapped in successive courses. Complementary flanges extending from each side of the tile each form a ridge and a groove, the groove of each tile being adapted to receive and lock the ridge of an adjacent tile.