Fascia and rake trim are among a structure’s first lines of defense against the elements. The fascia — or the board that runs along the length of the entire roof — serves many different functions. It connects to the roof rafters, closes off the attic, and serves as the mount for gutters. From an aesthetic standpoint, it’s the part that helps your roof appear finished. More than that, however, the fascia is a critical part of your roof’s ventilation system — it helps to keep the moisture out and seals the roof from the elements.