Abstract: A system for cladding roofs and facades of buildings includes elongated tracks. Each track has opposed lengthwise edges curved inwardly over opposed portions of the track. Each of a plurality of elongated panels has opposed lengthwise edges curved inwardly over opposed portions of the panel. Each panel is adapted to be interlocked between two spaced, parallel tracks. The system also includes fin components. Each fin component has two lengthwise edge portions defining a base of the fin component. A fin depends from the base of the fin component, which is adapted to be interlocked within a track with the fin extending away from the track with lengthwise edges of two proximate panels interlocked between the base of the fin component and the lengthwise edges of the track. Similar systems are provided for corners, overhangs, and jambs as may be encountered in a building.