Mounting system for roofs and the like

A mounting system comprising a plurality of rows of panels, each of said panels having a head portion and a heel portion and opposite side edges, at least some of said rows of panels being arranged in overlapping fashion whereby a heel portion of one panel is located vertically above a head portion of a vertically lower panel, a mounting structure for mounting said rows of panels to a roof structure, a spacer structure between said rows of panels to create an open area for an air layer to enhance air circulation between said vertically adjacent panels, said spacer structure being separate and distinct from said mounting structure, said spacer structure being free of direct securement to the underlying roof structure, said spacer structure comprising a base portion fitting between horizontally adjacent panels, at least a portion of said base portion terminating above a lower panel, a pair of wing portions extending from said base portion, and each of said wing portions being disposed against a lower one of said vertically adjacent panels on the upper surface of said lower adjacent panel and against the upper one of said vertically adjacent panels at the lower surface of said upper one of said vertically adjacent panels to create said open area between said vertically adjacent panels.