Flashing on a roof looks like thin metal pieces or strips installed at critical areas to direct water away from joints and penetrations, and its appearance varies by location and material. Around chimneys, flashing appears as L-shaped metal pieces called step flashing that interweave with shingles along the sides, and a top piece of counter flashing that is bent and inserted into the chimney mortar joints, often visible as a metal cap. In roof valleys where two roof planes meet, flashing appears as a long, continuous metal sheet running down the valley, either exposed as an open valley with visible metal, or concealed under shingles as a closed valley with only a small metal edge visible. Around vent pipes, flashing looks like a round metal base with a rubber boot that seals around the pipe, resembling a collar. Along sidewalls where the roof meets a vertical wall, step flashing appears as small rectangular metal pieces layered with shingles in a stair-step pattern. At eaves, drip edge flashing appears as an L-shaped metal strip along the roof edge under shingles, usually white, brown, or matching trim color. Flashing is typically galvanized steel silver, aluminum silver, or copper with its distinctive reddish-brown patina that turns green over time. Proper flashing is neatly integrated, not just caulked, and forms a watertight barrier.
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