Abstract: Structures for roofs, made of tiles of substantially planar and rectangular configuration or the like, including on one of their smaller edges at least one flange parallel to this edge which prevents displacement of the tiles with respect to the elongated supports on which the tiles rest directly by means of the flanges. A plurality of the supports are distributed one per each horizontal tile row and parallel therebetween, resting on a second plurality of more resistant elongated members. The elongated members are generally spaced from each other a distance larger than the space between the supports, horizontal and parallel as per inclined planes in the direction of the roof slope. Each elongated support has an "L" cross section from the edges of which longitudinal flanges project, forming angles of no less than 90.degree. with their respective legs.