Intersections of your roof, corners where one part of the roof joins with another, are a problem area for roof leaks. Installing roof flashing will prevent water from collecting in one place and penetrating the fine seams where the wood joins together. Roofing work that includes flashing, which is standard with all P.J. Fitzpatrick, Inc.’s roof installations, involves placing a plate of galvanized metal over these potential leak spots, preventing water penetration.