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roof the influence of roof on architectural <br />character is likewise manyfold, but <br />again shape and materials are primary. <br />the most common forms in the district <br />are gables, combinations of gables, <br />hips, and sheds to varying degrees of <br />slope. the most common roofing <br />material used in the better residential <br />structures is the shingle whether it <br />is of asphalt, tile, slate or wood found in <br />a variety of sizes. roofing material <br />for flat roofs of commercial structures <br />"has little influence on character. <br />frequent substitution of roll roofing <br />for shingles is not in keeping with the <br />original texture of sloped roofs. <br />in addition to form and material, . <br />roofs may have secondary design <br />elements which augment the character. <br />dormers in the. attic space modify <br />the basic shape, and the treatment at the <br />various edges and intersections present <br />a variety of solutions. the extent of <br />the overhang, how the eave and rake <br />line are treated, how the ridge lines <br />are sealed are all practical. problems <br />that are frequently elaborated for <br />artistic emphasis . , , the resulting. <br />design whether fanciful or plain is <br />a contributor to the architectural ' <br />character of the structure <br />openings the windows and entranceways present <br />sEill another opportunity for the design <br />