Abstract: A rectangular roof element is provided in the form of a sheet-like material which is bent back towards an upper surface thereof at an upper edge to provide a first hook and which is bent back towards an opposite lower surface at an opposite lower edge to provide a second hook. One side edge includes a gutter and an opposite side edge includes a stepped portion. The hooks, gutter and stepped portion are configured such that a plurality of similar roof elements may be joined together by mating first and second hooks of respective adjacent roof elements, and also mating gutters and stepped portions of respective adjacent roof elements.