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Prior Chicago Building Code
BUILDING CODE AND RELATED EXCERPTS OF THE MUNICIPAL CODE OF CHICAGO
DIVISION 1 - ADMINISTRATION
DIVISION 2 - DEFINITIONS
DIVISION 3 - USE AND OCCUPANCY CLASSIFICATIONS
DIVISION 4 - SPECIAL DETAILED REQUIREMENTS BASED ON USE AND OCCUPANCY
DIVISION 5 - GENERAL BUILDING HEIGHTS AND AREAS
DIVISION 6 - TYPES OF CONSTRUCTION
DIVISION 7 - FIRE-RESISTANCE-RATED CONSTRUCTION
DIVISION 8 - INTERIOR FINISHES (NA)
DIVISION 9 - FIRE PROTECTION SYSTEMS
DIVISION 10 - MEANS OF EGRESS
DIVISION 11 - ACCESSIBILITY
DIVISION 12 - INTERIOR ENVIRONMENT
DIVISION 13 - ENERGY EFFICIENCY AND ENVIRONMENTAL PROTECTION
DIVISION 14 - EXTERIOR WALLS (NA)
DIVISION 15 - ROOF ASSEMBLIES AND ROOFTOP STRUCTURES (NA)
DIVISION 16 - STRUCTURAL DESIGN
DIVISION 17 - STRUCTURAL TESTS AND SPECIAL INSPECTIONS
DIVISION 18 - SOILS AND FOUNDATIONS
DIVISION 19 - CONCRETE
DIVISION 20 - ALUMINUM (NA)
DIVISION 21 - MASONRY
DIVISION 22 - STEEL
DIVISION 23 - WOOD
DIVISION 24 - GLASS AND GLAZING (NA)
DIVISION 25 - GYPSUM BOARD AND PLASTER (NA)
DIVISION 26 - PLASTIC (NA)
DIVISION 27 - ELECTRICAL
DIVISION 28 - MECHANICAL SYSTEMS
DIVISION 29 - PLUMBING SYSTEMS
DIVISION 30 - ELEVATORS AND CONVEYING SYSTEMS
DIVISION 31 - SPECIAL CONSTRUCTION (NA)
DIVISION 32 - ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
DIVISION 33 - SAFEGUARDS DURING CONSTRUCTION
DIVISION 34 - EXISTING STRUCTURES
DIVISION 35 - REFERENCED STANDARDS

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ARTICLE II.  SAFETY REQUIREMENTS (13-124-310 et seq.)
13-124-310  Guards – Required.
   Guards to prevent persons from falling shall be provided as required in Sections 13-124-320 and 13-124-330, inclusive.
(Prior code § 75-1)
13-124-320  Guards – Required – Where.
   Guards shall be required at every point of danger including the following:
   (a)   At all edges of every floor, balcony, mezzanine or other space used or intended for human occupancy which is at a height of more than two feet above the floor, ground or pavement directly below, except that loading platforms and similar uses need not be equipped with guards;
   (b)   At all windows or doorways having a sill two feet or less above the floor of a room or space, unless such window or doorway opens directly upon the ground, pavement or guarded space, the level of which is less than two feet below the sill of such opening or unless the construction of the window serves the same purpose;
   (c)   At all sides of every open areaway exceeding three feet in depth except the side providing access to a stairway.
(Prior code § 75-1.1; Amend Coun. J. 10-1-03, p. 9163, § 4.8)
13-124-330  Guards – Types.
   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)
13-124-335  Openings in guards.
   Open guards shall have balusters or ornamental patterns such that a four-inch-diameter sphere cannot pass through any opening up to a height of 34 inches. From a height of 34 inches to 42 inches above the adjacent walking surfaces, a sphere eight inches in diameter shall not pass.
   Exceptions:
      1.   The triangular openings formed by the riser, tread and bottom rail at the open side of a stairway shall be of a maximum size such that a sphere of six inches in diameter cannot pass through the opening.
      2.   At elevated walking surfaces for access to and use of electrical, mechanical or plumbing systems or equipment, guards shall have balusters or be of solid materials such that a sphere with a diameter of 21 inches cannot pass through any opening.
      3.   In Class G, H-1, H-2 and I occupancies and in Residential Restrained Care Facilities in Class B occupancies, balusters, horizontal intermediate rails or other construction shall not permit a sphere with a diameter of 21 inches to pass through any opening.
      4.   In assembly seating areas, guards at the end of aisles where they terminate at a fascia of boxes, balconies and galleries shall have balusters or ornamental patterns such that a four-inch-diameter sphere cannot pass through any opening up to a height of 26 inches above the adjacent walking surfaces. From a height of 26 inches to 42 inches above the adjacent walking surfaces, a sphere eight inches in diameter shall not pass.
(Added Coun. J. 10-1-03, p. 9163, § 4.10; Amend Coun. J. 4-19-17, p. 48139, § 1)
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