Waterproof structure on metal roofing skylight limit

The utility model relates to a waterproof structure on metal roofing skylight limit will solve and improve metal roofing skylight limit waterproof performance technical problem, belongs to the architectural engineering technology field. Its characterized in that: the horizontal limit of skylight apron flashing is fixed with skylight frame overlap joint, and the vertical edge lower extreme is inwards turned on one's side to roll up and is the hook -type, the vertical edge's of skylight flashing board upper end is rolled over to turning up and is the hook -type turn -up to fixed with skylight apron flashing vertical edge's the mutual clasp joint of lower extreme, the sideline and the metal roofing board pore free welded on horizontal limit connect fixedly. The flexible waterproof coiled material is taken advantage of a situation downward all standing and is arranged in between the inside skeleton of skylight apron flashing, skylight flashing board, metal roofing board and roof. The beneficial effects are that: when first waterproof layer was broken through from the welding seam to rivers, the waterproof problem on skylight limit had been solved effectively to the second way waterproof layer of the flexible waterproof coiled material constitution of the all standing of taking advantage of a situation, has eliminated the waterproof hidden danger on skylight limit, has improved roof bracing system's whole waterproof performance comprehensively.