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ACOFFMAN <br /> N G I N EER S <br /> NOTE: New shear walls are not required on existing walls because the demand on the <br /> existing lateral-load resisting structural elements has not increased by more than 10% per <br /> IEBC Section 806.3 as long as the work area of the alteration does not exceed 50% of the <br /> floor area of the building. <br /> LATERAL DESIGN <br />