All free-standing sign structures or poles shall be selfsupporting structures erected on and permanently attached to concrete foundations. Foundations shall be designed to carry the weight and the wind load (Section 1385.09) of the sign, in soil in which it is placed. Such structures or poles shall be fabricated only from painted or galvanized steel, or such other materials as may be approved by the Administrator.
(1952 Code § 43-4-3)