The invention is a joint cover assembly and related method for covering a gap adjacent an edge of a panel that covers a sub-surface. The assembly includes a molding having a foot, a first arm, and a second arm. The foot is positioned along a longitudinal axis of the molding, wherein the first arm, and optionally the second arm, extend generally perpendicularly to the foot. A tab depends from at least one of the first and second arms. At least one of the tab and the foot engage a track in order to position the assembly over the gap. The method includes placing the foot in the gap, pressing the respective panel engaging surfaces into contact with respective panels, and configuring at least one of the tab and the foot to cooperate to retain the molding in the gap when the assembly is installed.