Horizontal-roofing and mounting method thereof

A roof wherein two combination solar battery and roof panels adjacent to each other in a direction perpendicular to a direction of flow of the roof are mounted on a joint drip plate, a keep plate and a joint cover are placed on the joint drip plate and the roof panels, said joint drip plate and keep plate are provided with an opening portion, and the two adjacent combination solar battery and roof panels are electrically connected with each other below said joint drip plate.

A roof in which an upper-end engaging portion of a downstream roof panel is seam-jointed with a lower-end engaging portion of an upstream roof panel, wherein at least said lower-end engaging portion has flexural rigidity enough to disengage said seam joint, wherein said roof panels are combination solar battery and roof panels in which a solar battery element is fixed on a backing by a resin, each combination solar battery and roof panel having a junction box for drawing power out of the solar battery element and a wire member on a back surface thereof, and wherein a longitudinal direction of a collector electrode on the solar battery element is parallel to a longitudinal direction of the lower-end engaging portion.