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separate headers whose area and spacing conform to <br /> the foregoing. <br /> Tension stresses due to seismic forces normal to <br /> the wall may be neglected if the walls do not <br /> exceed the height to thickness ratio in Table 2 of <br /> this Article and the in -plane shear stresses due <br /> to seismic loads as set forth in Table 3 of this <br /> Article, and the in -plane shear stresses due to <br /> seismic loads as set forth in Table 4 of this <br /> Article. If the wall height- thickness ratio <br /> exceeds the specified limits, the wall may be <br /> supported by vertical bracing members designed in <br /> accordance with Section 7 -5 -855. The deflection <br /> of such bracing member at design loads shall not <br /> exceed one -tenth of the wall thickness. <br /> All vertical bracing members shall be attached to <br /> the floor and roof construction for their design <br /> loads independently of required wall anchors. <br /> Horizontal spacing of vertical bracing members <br /> shall not exceed one -half the unsupported height <br /> of the wall nor ten feet. The wall height may be <br /> measured vertically to bracing elements other than <br /> a floor or roof. Spacing of the bracing elements <br /> and wall anchors shall not exceed six feet. <br /> Bracing elements shall be detailed to minimize the <br /> horizontal displacement of the wall by components <br /> of vertical displacements of the floor or roof. <br /> (2) Existing Roof, Floors, Walls, Footings, and Wood <br /> Framing. Existing materials including wood shear <br /> walls utilized in the described configuration may <br /> be used as part of the lateral load resisting <br /> system, provided that the stresses in these <br /> materials do not exceed the values shown in Table <br /> 4 of this Article. <br /> (c) Strengthening of Existing Materials. New materials <br /> including wood shear walls may be utilized to <br /> strengthen portions of the existing seismic resisting <br /> system in the described configurations provided that <br /> the stresses do not exceed the values shown in Table 5 <br /> of this Article. <br /> (d) Alternative Materials. Alternative materials, designs <br /> and methods of construction may be approved by the <br /> Building Official in accordance with the provisions of <br /> • the Uniform Building Code. <br /> 10 <br />