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In calculating wind pressure on curved surfaces <br /> such as cylindrical or spherical signs or sign structures, this <br /> ' pressure shall be assumed to act on six-tenths of the projected <br /> area. In all open frame signs or sign structures the area used <br /> in computing wind pressure shall be one and one-half times the <br /> net area of the framing members exposed to the wind. <br /> 2. Seismic Loads . In areas of high-intensity <br /> shock, all signs shall be designed in accordance with local <br /> requirements to resist earthquake shock. Wind loads and seismic <br /> loads need not be combined in the design of signs and sign <br /> structures . Only that loading producing the larger stresses need <br /> be used. <br /> 3. Alowable Stresses . The design of wood, concrete <br /> or steel members shall conform to the requirements of the latest <br /> edition of the Uniform Building Code, adopted by the City of <br /> Everett, nor shall loads, both vertical and horizontal, exerted <br /> on the soil produce stresses exceeding those therein specified. <br /> The working stresses of wire rope and its fastenings <br /> shall not exceed 25 per cent of the ultimate strength of the rope <br /> or fasteners . <br /> Working stresses for wind or seismic loads combined <br /> with dead-loads may be increased as specified in the Uniform <br /> Building Code. <br /> B. Material Requirements - Materials of construction <br /> for signs and sign structures shall be of the quality and grade <br /> as specified for buildings in the latest Edition of the Uniform <br /> y Building Code. <br /> 1. Restrictions on Combustible Materials. All <br /> signs and sign structures erected in Fire 'Zone No . 1 shall have <br /> .; structural members of incombustible materials. <br /> Ground signs may be constructed of any material <br /> meeting the requirements of this Code, except as provided above. <br /> Combination signs, roof signs, wall signs, pro- <br /> jecting signs, and signs on marquees shall be constructed of <br /> incombustible materials, except as provided in the following <br /> Subsection. No combustible materials other than approved plastics; <br /> shall be used in the construction of electric signs . <br /> 2 . Nonstructural Trim. Nonstructural trim may be <br /> of wood, metal, approved plastics, or any combination thereof. <br /> 3. Fastenings . Signs attached to masonry, concrete <br /> or steel shall be safely and securely fastened thereto by means <br /> of metal anchors, bolts, or approved expansion screws of <br /> sufficient size and anchorage to support safely the loads applied. <br /> 4+. Limitations on approved plastics. In Fire Zone <br /> No. 1, plastic sign face must have a fire-proof' separating <br /> retainer every 250 square feet . <br /> C. Horizontal and Vertical Clearances - No sign shall <br /> be located closer than eight (8 j feet' to any electrical or <br /> telephone conductor without written approval of both the <br /> -5- <br />