(a) When additional stories are added to an existing building, an apron shall be provided at the level of the lowest additional story and maintained during the period when materials are being placed or handled on the street front.
(b) Aprons shall be constructed of not less than two layers of two-inch planking or of other approved materials of equal strength and shall be designed to support a superimposed load of not less than 250 pounds per square foot. Aprons shall extend not less than six stories from the building wall. Aprons shall slope downward toward the building wall or shall be provided with a substantial curb not less than 12 inches high at the outer edge.
(c) For a building exceeding four stories or 50 feet in height and intended to be demolished, one apron shall be constructed for each four stories above adjoining sidewalk grade with the lowest apron located in the third story.
(Added Coun. J. 12-4-02, p. 99026, § 7.1)