In addition to the provisions of Section 106 of the Structural Specialty Code and similar provisions of other Specialty Codes, the building official of the city may approve a material or a method of construction not specifically prescribed by this chapter, provided he finds that the proposed design is satisfactory and that the material, method or work offered is for the purpose intended, and is at least the equivalent of that specifically prescribed by this chapter in quality, effectiveness, fire resistance, durability, safety, and energy conservation, and that the Manager of the Building Codes Agency has not issued a report disapproving the material or method for the purpose. The building official of the city may refer the proposed design to the Structural Code Advisory Board within thirty (30) days of the date of the ruling. The provisions of this section shall not be interpreted to preclude a person from requesting a ruling from the Manager of the Building Codes Agency prior to submitting an application to the city for a permit or after withdrawing a previously submitted application. (Ord. 5-1990 § 4, 1990.)