Abstract: A mounting system for mounting panels to a structure such as a roof comprises a plurality of spaced parallel tracks at least one of which is in the form of a plurality of laterally aligned track segments. Each of the track segments includes a base portion for being mounted to the framework of the structure and the exposed portion for accommodating a fastener. A row of mounting panels is provided for each track. Bach of the mounting panels has a surface indentation such as a slot into which a fastener would be disposed with each fastener having a hook portion mounted over the exposed portion of the track segment.