Guards may be formed by walls, balustrades, grills or railings not less than three feet, six inches in height, by area gratings or by other approved devices.
Exception: For single-family and two-family dwellings, and within individual dwelling units in other Class A-2 occupancies which are primarily permanent in nature, guards whose top rail also serves as a handrail shall have a height of not less than 34 inches and not more than 38 inches, measured vertically from the leading edge of the stair tread nosing.
(Prior code § 75-1.2; Amend Coun. J. 10-1-03, p. 9163, § 4.9)