In addition to the provisions of Section 106 of the Structural Specialty Code and similar provisions of other specialty codes, the building official may approve a material or a method of construction not specifically prescribed by this chapter; provided, that he finds that the proposed design is satisfactory and that the material, method or work offered is for the purpose intended at least the equivalent of that specifically prescribed by this chapter in quality, effectiveness, fire resistance, durability, safety and energy conservation, and that the director of the Department of Commerce has not issued a report disapproving the material or method for the purpose. The building official may refer the proposed design to the city board of appeals, and a person affected by a ruling of the building official may appeal such ruling to the board of appeals within 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 director of the Department of Commerce prior to submitting an application to the city for a permit or after withdrawing a previously submitted application. (Ord. 221 § 5, 1977).