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� <br /> Incombustible material is any material which will not igni�e <br /> at, or below, a temperature of 1, 200 degrees Fahrenheit and will <br /> not continue to burn or glow at that temperature . <br /> Section 4.9 Members supporting unbraced signs shall be so <br /> proportioned that the bearings loads imposed on the soil in either <br /> direction, horizontal or vertical, shall not exceed the safe values . <br /> Braced groundsigns shall be anchored to resist the specified wind <br /> or seismic load acting in any direction. Anchors and supports <br /> shall be designed for safe bearing loads on the soil and for an <br /> effective resistance to pull-out amounting to a force 25 per cent <br /> greater than the required resistance to overturning. <br /> Signs supported by frames or posts rigidly attached to the <br /> base but not anchored into the ground shall be so proportioned <br /> that the weight and size of the base will be adequate to resist <br /> the wind pressure specif ied in Section 4.2. <br /> Signs attached to masonry, concrete, or steel shall be <br /> safely and securely fastened thereto by means of inetal anchors, <br /> bolts, or approved expansion screws of sufficient size and <br /> anchorage to safely support the loads applied. <br /> No wooden blocks or plugs or anchors with wood used in con- <br /> nection with screws or nails shall be considered proper anchorage, <br /> except in the case of signs attached to wood framing . <br /> No anchor or suppori: of any sign shall be connected to, or <br /> supported by, a parapet wall, unless such wall is designed in <br /> accordance with the provisions for lateral bracing, Chapter 23, <br /> Appendix, of the Uniform Building Code £or parapet walls. <br /> Section 4.10 Cables, chains, wires ox other flexible or <br /> loosely<connected members shall not be considered as providing <br /> lateral bracing��`�or as furnishing any support to any sign unless <br /> -17- <br />