A fascia board diagram depicts the components that protect and enhance a roof’s edge. It includes the fascia board, which shields the roof edge from water infiltration; the drip edge, diverting water away from the roof deck; the soffit, allowing attic ventilation; the rake board, safeguarding vulnerable corners; and the fascia cap, protecting the fascia board and adding aesthetic appeal. These elements work together to ensure the roof’s integrity, preventing water damage and maintaining its functionality and appearance. Understanding their roles through a diagram helps maintain a healthy and attractive roof system.