(a) Wind pressure. All signs shall be designed and constructed to withstand wind pressures of not less than that required for buildings and other structures as set forth in the Building Code of the city.
(b) Earthquakes. Signs adequately designed to withstand wind pressures specified in subsection (a) hereof are considered capable of withstanding earthquake shock, except in areas subject to high-intensity shocks, where all signs shall be designed in accordance with local requirements to resist earthquake shock. Wind loads and earthquake loads need not be combined to determine the maximum horizontal loads acting upon a sign. Only the larger of the two loads need be used for design.
(c) Approved materials for trim. Non-structural trim may be made of metal, wood or approved combustible plastics, or any combination thereof. Facings, letters and decorations of all types of signs may be made of metal or approved combustible plastics. Facings, letters and decorations of signs other than electric signs may be made of wood.
(Ord. 4778, approved 11-16-1976)