What components are required for head flashings on chimneys less than 30 inches wide?

For chimneys that are less than 30 inches wide, both base flashing and counter-flashing are essential components. The base flashing is installed directly around the base of the chimney and serves to direct water away from the chimney structure to prevent water from entering the roof system. It ensures that water is channeled properly to the roof drainage system.

Counter-flashing, on the other hand, is installed above the base flashing and is integral in providing additional protection against water penetration. It is typically set into the masonry of the chimney and overlaps the base flashing, which helps prevent water from seeping behind the base flashing.

The combination of both components is crucial for effective water management and to maintain the integrity of the roof and chimney junction, minimizing risks of leaks and water damage. Without both flashings, the risk of water infiltration increases, which can lead to significant damage over time.