Abstract: A double curved tile with a larger capacity of pluvial and eolian seal comprising a body having a central curved portion provided with first and second lateral parts each of a different shape, the first and second parts form a semi-curved upper surface one provided with an overlaying ledge and the other an underlying ledge to fit under the overlying ledge the, first and second lateral parts forming a continuous curved portion, and the first and second lateral parts being juxtaposed to each other to form an enclosed space for the flow of water and to prevent seepage or leakage of water from the space.

Abstract: A tile (1) provided with lateral longitudinal fixed joinable lower elements (13) on an underlying surface (8) and upper (14), and at a front end of the tile, an antisliding detent (15) is present. A method and system for covering a roof using a tile (1) having a central curved portion whereby two or more tiers are formed by the tiles joined together by upper elements and lower elements, and adjacent tiers joined together with one tier overlying an adjacent tier and being locked together by the antisliding detent.

Abstract: A tile (1) provided with lateral longitudinal fixed joinable lower elements (13) on an underlying surface (8) and upper (14), and at a front end of the tile, an antisliding detent (15) is present. A method and system for covering a roof using a tile (1) having a central curved portion whereby two or more tiers are formed by the tiles joined together by upper elements and lower elements, and adjacent tiers joined together with one tier overlying an adjacent tier and being locked together by the antisliding detent.