Roof. The type, shape, pitch, texture and color of a roof should be considered as an integral part of the design of a building and should be architecturally compatible with the style, materials, colors and details of such building, The minimum permitted roof pitch should be 8/12 and all gables on a building should be of the same pitch. A flat roof may be permitted on a building of a minimum of two stories in height, provided that all visibly exposed walls should have an articulated cornice that projects out horizontally from the vertical building wall plane. Mansard roofs are permitted. Architectural embellishments that add visual interest to roofs, such as dormers, belvederes, masonry chimneys, cupolas, clock towers and such similar elements are encouraged, provided these elements are architecturally compatible with the style, materials, colors and details of the building.