Abstract: A panel construction for roofs and walls of buildings incorporates holding clips secured to supporting roof purlins with the aid of a template and positioning device which establishes the spacing of the clips. The panels, of sheet material, have hollow upstanding dovetailed latching or holding ribs extending longitudinally of medial areas thereof. Complemental partial latching rib portions are provided along the longitudinal edges of the panels which interlock in sealed engagement with the complemental partial rib portions of adjacent panels, to define complete dovetailed latching ribs at the joints of the adjoining panels. The latching ribs are shaped to conform to the retaining portions of the clips and during assembly are snapped into latched relation with the clips by pressure exerted, as by means of the foot of the installer, on the tops of the ribbed portions of the panels. Beneath the lapped portions of adjacent panels the purlins are bridged by lap supporting beam members which are keyed to the clips.

Abstract: A panel construction for roofs and walls of buildings incorporates holding clips secured to supporting roof purlins in overlying relation to locator strips which are installed preliminarily to establish the spacing of the clips. After the locating strips are positioned, the clips are temporarily located by interfitting portions of the strips and clips, whereafter permanent fasteners are extended through the clips and strips and into the supporting structural element. The clips are double bent sheet metal elements having integral latch-type retaining portions. The panels, of sheet material, have hollow upstanding dovetailed latching ribs extending longitudinally of medial areas thereof, and complemental partial latching rib portions along their longitudinal edges and which interlock in sealed engagement with the complemental partial rib portions of adjacent panels to define dovetailed latching ribs at the joints of the adjoining panels.