Pieces of metal, built into the joints of a wall, so as to lap over the edge of the gutters or to cover the edge of the roofing; also, similar pieces used to cover the valleys of roofs of slate, shingles, or the like. By extension, the metal covering of ridges and hips of roofs; also, in the United States, the protecting of angles and breaks in walls of frame houses with waterproof material, tarred paper, or the like. Cf. Filleting.
Connecting materials that seal the roof membrane at expansion joints, drains, gravel stops, and other places where the roof membrane is interrupted. Base Flashing forms the upturned edges of the watertight membrane at curbs and walls. Cap or counterflashing shields the exposed top edges of the base flashing.