(a) Definition. A roof sign means any sign erected, constructed and maintained wholly upon or over the roof of any building with the principal support on the roof structure.
(b) Construction. Every roof sign, including the upright supports and braces thereof, shall be constructed entirely of incombustible materials; provided, that combustible structural trim may be used thereon.
(c) Location.
(1) Height and area limitations. No roof sign shall have a surface or facing exceeding 300 square feet, nor have its highest point extended more than twenty feet above the roof level.
(2) Set-back from roof edge. No roof sign shall be erected or maintained with the face thereof nearer than five feet to the outside wall toward which the sign faces.
(3) Space between sign and roof. All roof signs shall have a space at least five feet in height between the base of the sign and the roof level, and have at least five feet clearance between the vertical supports thereof.
(4) Prohibited obstructions. No roof sign shall be placed on the roof of any building or structure in such manner as to prevent free passage from one part of such roof to any other part thereof or interfere with openings in such roof, and such sign shall comply with Section 1741.10.
(d) Erection.
(1) Bracing, anchorage and supports. Every roof sign shall be thoroughly secured to the building by iron or other metal anchors, bolts, supports, rods or braces. When erected upon buildings which are not constructed entirely of fireproof material, the bearing plates of such sign shall bear directly upon masonry walls and intermediate steel columns in the building. No roof sign shall be supported or anchored to the wooden framework of a building.
(2) Wind pressure and dead load requirements. All roof signs shall conform to the requirements of Section 1741.08.
(Passed 9-16-57.)