All sidewalks hereafter shall be built of stone flagging or cement or so-called artificial stone. If the owner uses natural stone flagging it shall be constructed as follows: no stone shall be less than three inches thick and shall contain not less than six square feet. It shall be laid upon a foundation of not less than six inches of sand thoroughly rammed and rolled down. The stone shall be evenly dressed on the sides and edges, the joints laid close and the surface even and uniform. If the owners use cement or so-called artificial stone the following specifications shall be strictly followed: excavate to a depth of not less than nine inches below the grade of the proposed walk, then fill in to a depth of five inches below the grade line with bank sand, which shall be thoroughly wetted down and, while wet, thoroughly rammed or tamped down. In place of the latter, coal cinders or coal ashes or screen gravel may be used for the upper course for a depth of two inches, which shall be wet down and rammed or tamped in the same way. On this shall be laid four inches of grout made from mixed fine and coarse gravel from which the same has been screened, in the proportion of six parts gravel and one of cement, which shall be thoroughly mixed, brought to the proper consistency, uniformly spread and then thoroughly rammed and tamped down. But one kind of cement shall be used in the walk and one of the following kinds only shall be used: Imported English Portland Germania or Dycherhoff cement, American Alpha Sandusky, Wyandotte, Bronson, Wolverine. Provided, however, that other kinds may from time to time be used when so ordered by the City Council. Fill in on top of the grout to the grade line with a mortar made of two parts of clean, sharp screen sand and one part of one of the above named kinds of cement thoroughly mixed, brought to proper consistency, and uniformly spread and brought to the grade line; this mortar shall be floated and made uniformly level, after which dry cement shall be dusted over the top, using as little as may be needed to break the gloss of the same and prevent slipping by walking thereon. After being allowed to stand not less than 20 minutes, or until it "putties", float down and cut the blocks. The whole surface shall then be roughened by first pressing down and then quickly removing a steel float. For a distance of one inch on each side of the outline of the blocks the surface may be troweled down smooth and the earth upon each side of the walk shall be raised even with the surface of the walk.
('77 Code, § 17.202) (Ord. 19, eff. 7-15-05)