(A) It shall be unlawful to construct any billboard on the roof of any building or structure of any but incombustible materials. All such roof signs or billboards must be so constructed that there is at least a four-foot space between the billboard or signboard and the edge of the roof at all sides and ends. It shall be unlawful to construct any roof signs or billboard on the roof of any building which is unable to stand the additional weight and wind pressure imposed by such construction. All roof signs and billboards which are constructed on buildings which are not constructed entirely of fireproof materials shall be so constructed and braced that the supports of such signs or billboards shall bear directly on the masonry walls of such buildings, or upon the steel girders which are supported by the masonry walls.
(B) The metal supports and parts of every roof sigh shall be thoroughly and properly painted at least once each two years, unless they are galvanized or otherwise adequately protected against rust and corrosion.
('70 Code, § 11.8.9) Penalty, see § 153.99