Shelter roof structure

A roof structure is composed of a plurality of prefabricated formed metal saddle elements which have four sides and which are bent along a diagonal between nonadjacent corners to define two triangular portions having corners opposite the bend line and lying in planes inclined to each other. The roof also includes half saddles similar to one triangular portion of a full saddle. The saddles and half saddles are connected to define plural pyramids having four sides and quadrilateral bases. A basal corner of a pyramid is connected to the basal corners of no more than three other pyramids. Depending upon the nature and location of supports for the roof, struts may be connected between some but not all of the pyramids adjacent their apices; in some instances, no struts are required.