Flashings are used wherever something intersects the roof. These are the most important areas of your roof. Various materials can be used to protect these areas: sheet metal (copper, galvanized steel, aluminum), Lead, ice and water shield, membranes, and sealants can be integrated at siding, chimneys, walls, gutter lines, skylights, pipes, and vents. If the existing flashing is in good shape they can sometimes be re-used. However, since flashing can be the most critical roof component we recommend new flashings if there is any concern about the existing.