A perfected roof tile, characterized essentially by a trapezoidal flat portion, and a convex-conical portion, with an upper closing rib to form a closing drainage channel to form a drainage channel and with another superior nerve means than with the the above described upper nerve forms its corresponding channel, this nerve forming another channel that serves as a socket for the tile to be joined, and having another superior nerve lower than the previous one to form a socket channel. 2.a perfected tile, according to the preceding claim, characterized essentially by comprising drain channel and fitting channel, to accommodate the rib of the lower face of the tile to be assembled, with assembly teeth that rest on the tongue of the tile to be joined, and with a right lateral closing edge. 3. Finished tile, according to previous claims, essentially characterized by the left outer lateral means, which with the left lateral means mediates a drainage channel and a socket for the tile to be joined, and this last lateral nerve another less deep channel with the nerve lower lateral left, the nerve is fitted in the channel of the lower face of the tile to be joined and forms a shallower channel than the previous one, this somewhat flattened nerve rests on the edge of the tile to be joined by its face lower, with its lacing channels to serve as a drain and more internal drainage channel and outlet channel for drainage to the flat part of the channel tile, and a flat tongue to receive support from the assembly teeth. 4. Advanced tile, according to previous claims, essentially characterized in that the lower face of the tile with concave-conical portion and trapezoidal conical portion, has chamfer at the lower left edge, with wide reinforcement rib and ends in its convex part in its cone smaller, and with step and reinforcement nerve. 5. Tile perfected, according to claim 4, because it has a clamping lug, to the effect of the need for the tile when placed on a bar, and to avoid sliding by tilt of the cover, with support and leveling lugs and their corresponding teeth in the upper face that they rest on the tongue of said face, in order to avoid tile uprisings and to include lateral left lateral nerve that rests on the nerve of the upper face of the tile to be joined. 6. Improved tile, according to claims 4 and 5, characterized essentially because the face 4 and 5, essentially characterized by the face and with the fitting channel for the tile to be joined, receiving in its bosom the edge-rib of the upper tile join, and in turn form the left inner lateral nerve with canal with elk external left lateral nerve, to constitute the referred nerve the reinforcement of the left lateral edge of the tile, with reinforcement nerves of the concave and superior portion of the bºveday and another nerve of similar reinforcement to travel the entire concave part to stop the entry of air, and because in addition the lower and more anterior rib of the tile that runs through the entire flat and concave part is housed in the channel of the upper face, forming the tile to be assembled by the other nerves. 7. Tile perfected, according to previous claims, essentially characterized in that the section of the trailing edge of said tile shows a chamfered rib and trailing edge of tile, with teton-tether teeth and teeth for the assembly of the tile to be assembled. 8. Perfected roof tile, according to previous claims, essentially characterized in that in the section of the front edge of the tile has a tongue to avoid being lifted by fitting with the other tile to be joined and with a front edge of engagement with the tile also to be joined together. 9. Finished tile. (Machine-translation by Google Translate, not legally binding)