A flashing is a barrier, usually aluminum, copper, galvanized steel or an asphalt based membrane, or roll roofing that seals the joint(s) when a roof plane is interrupted (skylights, vent pipes, chimney, side wall, etc.) or altered (valleys, gables, etc.). The flashing is designed to divert water away from the joint to prevent interior water penetration.
Considerations
Most roof leaks are not the result of worn roofing materials; rather most are caused by missing or defective flashing. There are many types and styles of flashing available depending on the roof style. They all have one thing in common – the requirement for constant monitoring and periodic maintenance. If installed improperly, or as a result of normal aging, flashing will eventually dry out, separate, tear, or otherwise fail and no longer provide a watertight seal.
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