(A) Approved expansion joint material as specified in § 5.24 of this chapter, one-half inch in thickness, shall be inserted wherever the walk abuts against an intersecting walk, building or driveway wherever the walk terminates at a street, alley or other pavement and shall be spaced at a maximum of 100 feet, measured along the center line.
(B) The expansion joint material shall be as wide as the sidewalk is thick and shall be set in the proper location prior to pouring the concrete. It shall be set perpendicular to the surface of the walk and in a straight line at right angles to the longitudinal edge of the walk with the upper edge of the expansion joint material flush with the surface of the walk when finished.