Roof drainage subassembly

The utility model discloses a roof drainage subassembly, its for flexible and can the shaping in the roof that has the profile on the surface for prevent water or air moisture through the smooth ceiling of entering house of roof open -top, the subassembly includes film, bond line, bonding sealant release liner and the inferior lantern ring of the roof drill way guard shield of truncated cone shape, main lantern ring part, coating paper tinsel, and the roof export guard shield of truncated cone shape has the central cavity opening of can the cavity opening bottom being located being connected on the top, main lantern ring parts can be connected to the roof export guard shield of truncated cone shape and use and export the guard shield top on the roof of truncated cone shape and have central cavity opening as characteristics, the film of coating paper tinsel covers the top surface, and the bond line just covers the bond line at the bonding sealant release liner of basal surface at the middle part to there is ca