Abstract: A frame supporting the dome of a skylight is formed with conduits along the outer peripheral edges of the flange at the base of the dome, receptive of water runoff from the dome. The conduits are formed with openings for conducting the water to the outside of the curb on which the frame is mounted. When, due to heavy precipitation, or for other reason, some of the runoff water passes under the lower surface of the flange of the dome, it passes over the inner lip of frame members on which the flange rests and into a second conduit below the first which conducts this portion of the runoff also to the outside of the curb and away from the opening within the curb over which the skylight is positioned.