A large, flat, clay interlocking tile, the Double HP 20 has a thin, tapered leading edge. The slate colour tile can be specified as an economical natural alternative to man-made and other slates. This product whilst being large format has the appearance of a small module interlocking slate or tile coupled with low pitch suitability. It is a single large interlocking tile with the appearance of two small format tiles. This produces a roof that satisfies the need for a smaller module tile and low pitch suitability yet is economical to lay.