The outer covering of all exterior walls shall be moisture-resistant, of sufficient stiffness and properly anchored to remain in place during high winds and be reasonably permanent, and for the purpose of reducing the fire-hazard be restricted to the following materials: wood-siding, exterior grade plywood, brick, cement block, cinder block, cement shingles, asphalt shingles, and brick siding, including other materials as may from time to time be approved by the Code Administrator as reasonably resistant to fire; provided, however, that no such materials shall include either tar paper or building paper.
(1990 Code, § 8.14)