1339.17 PROJECTING SIGNS.
(a) Location. Within any B-2 or CB Business District projecting signs shall be placed at least eight feet above the public right-of-way over which it is erected and shall not project to a point less than two feet from the curbline of any street or alley. In every B-1 Business District projecting signs shall be at least nine feet above the public right-of-way over which it is erected and shall not project to a point less than 2' from the curbline of any street or alley.
(b) Construction.
(1) All projecting signs shall be constructed of metal or other equally noncombustible material. Approved plastics may be approved for use.
(2) Every projecting sign shall be securely attached to the building, wall or structure by iron or metal anchors, bolts, supporting chains, stranded cables or steel rods. Projecting signs shall be adequately supported by guy wires of the size stock specified below to resist dead loads and wind loads:
Nominal Size of Guy Wire Stock to be Used | Approx. Breaking Load of Standard Strength Stranded Cable | Lift Load Per Lift Guy | Allowance Sign Area Per Wind Guy | Threaded Stock Allowable of Equl Strength of Tension (inch) | Minimum Thickness of Rolled Stock Used |
1/8 | 540 | 90 | 6 | 1/8 | |
3/16 | 1150 | 190 | 12 | 5/16 | 3/16 |
7/32 | 1550 | 260 | 17 | 3/8 | |
1/4 | 1900 | 320 | 22 | 3/8 | 1/4 |
5/16 | 1200 | 530 | 35 | 7/16 | |
3/8 | 4250 | 710 | 48 | 5/8 | |
7/16 | 5700 | 950 | 63 | 5/8 | 5/16 |
(3) Holes for threaded stock used in anchorage should be at least six inches to eight inches apart. Anchorage should be completely through wall material and secured on inner side of walls, or expansion shields may be used of equal strength and firmly secured. Welded anchorage to a building girder or floor beam is preferred where possible, for the larger signs. Special care should be taken to install firm anchorages.
The above load table is recommended for various sizes of guy wire and for hardware of equivalent strength. Where the sign contractor stocks a certain size of wire, multiple guys may be used for heavier sign or for signs of larger allowable areas.
(4) Minimum size steel in all double face projecting signs shall be 1-1/2 by 1-1/2 by 1/8 inch angle. All double face projecting signs shall have an angle iron frame completely around the edge of the sign. The heavier angles are for the main horizontal supports, and the smaller angles are for the vertical members and for bracing. Should a projecting sign involve more than one section, each section will be considered separately.
(5) Approval for the use of metal supports other than steel must be obtained from the Bureau of Building, Inspections, Licenses and Permits. A stress analysis showing the adequacy of the materials must be submitted to the Bureau. (Ord. 94-185. Passed 9-6-94. )