Abstract: A panel made of sheet metal, synthetic resin, or the like and adapted to be mounted shingle-fashion with a plurality of other such panels to an upright wall is of generally rectangular shape with upper and lower end edges and lateral side edges. Between these edges the panel has when mounted a horizontal bend subdividing it into an upper half and a lower half. In the upper half the panel has an upper central substantially planar region which is surrounded by an upper downwardly U-shaped non-planar attachment portion by means of which the entire panel is secured to the upright wall. The lower half has a lower central substantially planar region which is contiguous at the bend with the upper planar region and generally coplanar therewith in a relaxed unmounted condition of the panel.