End lap system for roof cladding sheets

A clip for holding together an upper roof cladding sheet and a lower roof cladding sheet in an end lap relationship on a roof with the upper cladding sheet overlapping the lower cladding sheet, and with the clip being formed (a) to fit over and lock onto a rib of the lower cladding sheet and (b) to retain the upper cladding sheet on the clip, with the clip including a top wall, a pair of legs that extend downwardly from opposite sides of the top wall and an opening in the top wall to allow a fastener to be inserted through the opening to secure the clip and the lower cladding sheet together or to secure the clip and the lower cladding sheet to a support structure or to each other, with the top wall including a formation for contacting an upper section of the rib of the lower cladding sheet to space the top wall above the rib, with the formation being in the form of a pair of downwardly extending tabs at opposite ends of the top wall and with the legs including re-entrant portions that are formed to extend into inwardly formed channels defined by re-entrant portions of the rib of the lower cladding sheet, and with the leg re-entrant portions and the top wall formation being formed to contact the rib and cooperate together to lock the clip onto the rib when the clip is fitted over the rib.