Roof tiles

An interlocking roof tile having an upper edge;

• a lower edge which is visible in use when the tile is laid in overlapping relationship with at least one tile of a next adjacent line of the tiles;
• an upper surface;
• a lower surface;
• a supporting understructure;
• two oppositely facing side edges;
• an underlock extending along one of the side edges and an overlock extending along the other of the side edges;
• the underlock having a lower end and an under surface which forms part of the lower surface of the tile, and a lower edge portion having an under surface which includes a part of the under surface of the underlock, and which overlaps, in use, at least one tile of the next adjacent line of the tiles;
• characterized in that the upper surface of the tile extends continuously from the lower edge to the upper edge, in that the upper and lower surfaces are cambered from the lower edge to the upper edge and are substantially flat when considered in cross-section taken along a line extending between the side edges, in that the lower edge portion including the underlock has a taper which extends in the direction of the lower edge of the tile at least as far as the lower end of the underlock so that, in use, the under surfaces of the lower edge portion and the underlock overlie the continuous upper surface of at least one tile of the next adjacent line of the tiles, whereby the lower end of the interlocking roof tile is of reduced thickness and thereby aesthetically acceptable and the interlocking roof tile can be laid in either a straight relationship or a staggered relationship with respect to the next adjacent line of the tiles, and in that the interlocking roof tile is capable of being supported by its understructure on decking of a decked roof.