Abstract: A sheet metal panel for a standing seam roof, a standing seam roof formed of the panels, and a method of installing the roof. Each panel is generally in the form of a shallow channel, having a web and first and second flanges extending up from the web at opposite sides of the web. The first flange has a downwardly opening channel section at its upper margin on the outside, with a sealing strip in this channel section. The second flange has a sealing lip section at its upper margin on the inside. In the roof, the panels are mounted alongside one another on the panel supporting means (e.g., purlins) of the roof, with the first and second flanges of adjacent panels alongside one another and with the lip section on the second flange of one of two adjacent panels sealingly engaging the sealing means in the channel section on the first flange of the other of two adjacent panels.