What does wood fascia cover in a roofing structure?

Wood fascia is an essential component in roofing structures, specifically serving to cover the ends of roof rafters. This typically includes the horizontal board that runs along the edge of the roof, providing both a finished appearance and a practical function.

By covering the exposed ends of the rafters, fascia protects them from the elements, helping to prevent moisture intrusion and decay, which can be detrimental to the integrity of the roof. Additionally, fascia often serves as a mounting point for gutters, ensuring proper drainage of rainwater away from the building's façade and foundation, which is vital for long-term structural stability.

The other responses refer to different aspects of roofing construction. The underside of roof overhangs pertains more to the soffit, which is installed beneath the roof's eaves, while the vertical edges of the roof relate to the sides of a building and aren't specifically what fascia addresses. The overall surface of the roof refers to the roofing material applied across the top, which does not involve the fascia board directly. Thus, the choice identifying fascia as covering the ends of roof rafters correctly encapsulates its function in roofing structures.