Abstract: A weather block for tile roofs. Tile roofs having a plurality of individual tiles configured adjacently to form rows of undulating tiles, with a first row of overlapping tiles, and where each one of the tiles in the first row of overlapping tiles have an upper end and an upper surface, are provided, adjacent thereto with a weather block of unique design. The weather block has an elongate spacer portion adapted to be located longitudinally straddling said upper end of the first row of tiles. The spacer extends laterally between an upper edge portion and a lower edge portion. A backing portion is provided extending downwardly from the upper edge portion of the spacer portion. A weather stop portion is provided extending downwardly from the lower edge portion of the spacer portion. The weather stop portion has a lower edge portion sized and shaped for close fitting engagement with the upper surface of the first row of tiles, to provide high resistance to wind blown water.