Pedimented dormers are similar to gabled dormers, but they incorporate details rooted in classical architecture. In ancient Greece and Rome, buildings often had a row of columns across the front. They supported a horizontal beam that held up a triangular wall, known as the pediment, that was under the roof peak. On pedimented dormers, molding emphasizes a similar triangular shape. Vertical molding on either side of the windows stands in for columns.