In all signs, the allowable stresses, materials and details of design shall render all signs safe to persons, property and the movement of traffic along all streets and public thoroughfares. All signs shall be designed, constructed and installed in conformity with this chapter and applicable statutes of the state. All signs shall be supported by signs structures which are made of wood, concrete, steel or other structural material designed and constructed to resist wind pressure and dead and lateral loads in accordance with the following specifications:
(a) For steel sign structures, American Standard Building Code requirements for structural steel, as approved by the American National Standards Institute, Inc., shall apply. Secondary members in contact with or directly supporting the facing may, in all types of signs, be formed of light gauge steel, provided such members are designed in accordance with the Light Gauge Steel Design Manual of the American Iron and Steel Institute.
(b) For wood, National Design Specifications for Stress Grade Lumber and Its Fastenings, recommended by the National Forest Products Association, shall apply.
(c) The working stress of chains, wires, ropes and steel guy rods and their fastenings shall not exceed one-fourth of their ultimate strength.
(d) For other materials, recognized engineering standards will be accepted.
(Ord. 76-36, passed 6-22-1976)