All signs shall be constructed of galvanized iron, copper, brass, glass or other non-corrosive, incombustible material. All signs, if placed at a right or other angle to the wall or roof of any building, shall be attached by non-corrosive metal bolts, anchors, cables or other metal attachments which shall ensure permanent and safe construction, and shall be maintained free from rust or other defects. Every means or device used for attaching any sign shall extend through the wall or roof of the building, and shall be securely anchored by wall plates and nuts to be inside of the walls or to bearings on the under side of two or more roof or ceiling joists, in accordance with instructions given by the City Manager. Small signs containing less than ten feet of area may be attached flat to a building by the use of lag bolts or other means to the satisfaction of the City Manager.
(2009 Code, § 98.19) Penalty, see § 155.999