If your roof has chimneys, dormers, and walls, then you will see flashing on your estimate. Flashing prevents water from seeping behind and under shingles, causing water damage to the structure.
Flashing is usually thin sheets of aluminum or galvanized steel. Many professional roofers will fashion their own from sheet metal. Flashing is installed over joints in the roof & wall construction. Possible areas are valleys, chimneys, dormers, windows, pipes, skylights, porches, decks and edges.
New flashing often installed with a new roof. If flashing deteriorates or comes loose is can cause severe damage to your home. It is important to make sure it is installed properly to avoid unnecessary damage.