Roof panels are boards that can directly withstand roof loads. The roof panel is located on the roof of the house and is generally made of metals such as aluminum, magnesium, manganese, or alloys. After the roof panels are assembled on the sloping beams of the gable on the top floor of the house, the wing panels are overlapped and covered to prevent vertical seams from appearing in the multiple individual box shaped roof panels, forming a well integrated sloping roof.