The drawing contents include: common roof structure node CAD drawing collection, insulated roof, coiled material roof building structure, internal drainage concealed pipe, parapet flashing and coping plate, parapet and flashing, flat roof drainage component combination, flat roof overhang, flat roof overhang (eaves) without insulation layer, flat roof overhang (eaves) cast-in-place cornice, flat roof overhang (eaves) prefabricated cornice, Iron sheet chimney - ventilation pipe out of the house