The answer to 'what is drip edge' is Drip edge is a thin metal flashing that is installed along the edges of a roof. It is designed to direct water runoff away from the roof's edge and prevent water damage to the fascia board and exterior walls. Drip edge is an important component of a properly installed roof system and is required by most building codes.
Drip edge is typically made of aluminum, galvanized steel, or copper and is available in a variety of colors to match the roof and exterior of the home. It is installed by nailing or screwing it to the roof's edge, creating a small overhang that guides water away from the building. This helps prevent water from seeping under the roof's edge and causing damage to the fascia, soffits, and exterior walls.