(A) Monolithic concrete walls having less than .02 of 1% of reinforcing steel shall be considered as plain concrete and the thickness of single bearing walls of plain concrete shall be in accordance with the recommendations in the report of the American Standard Building Code Requirements for Masonry, 1952 edition.
(B) Subject to the requirements in other parts of this chapter, reinforced concrete bearing walls shall have a thickness of not less than six inches for the top story with the thickness of succeeding lower stories including basement, increasing at the rate of one inch for each two stories.
(C) In such walls the amount of reinforcement shall be at least .02 of 1% in each direction, horizontal and vertical, the steel being equally distributed on each face of the wall within a maximum bar spacing of 24 inches.
(D) The combined thickness of the separate parts of double or triple monolithic walls shall be not less than that required for single walls, and no single section of a double or triple wall shall be less than four inches thick. The sections shall be tied together with 3/8 inch round or square galvanized or tar-coated rods, with two-inch hooks at each end, the rods to be spaced not more than 18 inches horizontally and vertically.
(E) Exterior panel walls supported at each story of skeleton construction buildings shall not be less than five inches thick of reinforced concrete.
('72 Code, § 151.031) Penalty, see § 10.99