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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
CHAPTER 18-29 PLUMBING*
Article 1. Administration (18-29-101 et seq.)
Article 2. Definitions (18-29-201 et seq.)
Article 3. General Regulations (18-29-301 et seq.)
Article 4. Fixtures, Faucets and Fixture Fittings (18-29-401 et seq.)
Article 5. Water Heaters (18-29-501 et seq.)
Article 6. Water Supply and Distribution (18-29-601 et seq.)
Article 7. Sanitary Drainage (18-29-701 et seq.)
18-29-701 General.
18-29-701.1 Scope.
18-29-701.2 Sewer required.
18-29-701.3 Separate building sewer connection.
18-29-701.4 Sewage treatment.
18-29-701.5 Damage to drainage system or public sewer.
18-29-701.6 Tests.
18-29-701.7 Connections.
18-29-701.8 Notification of wrecking buildings and sealing or abandoning sewer facilities.
18-29-702 Materials.
18-29-702.1 Above-ground sanitary drainage and vent pipe.
18-29-702.2 Underground building drainage and vent pipe.
18-29-702.3 Building sewer pipe.
18-29-702.4 Fittings.
18-29-702.5 Chemical waste system.
18-29-702.5.1 Glass pipe.
18-29-702.5.1.1 Padding.
18-29-702.5.1.2 Thickness.
18-29-702.5.1.3 Buried pipe.
18-29-702.6 Safe pan material and construction.
18-29-702.6.1 Material.
18-29-702.6.2 Construction.
18-29-703 Building Sewer.
18-29-703.1 Building sewers, building drains or drainage systems installed near the water pipes and water supply system.
18-29-703.2 Drainage pipe in filled ground.
18-29-703.3 Sanitary and storm sewers.
18-29-703.3.1 Combined sewers.
18-29-703.4 Existing building sewers and drains.
18-29-703.4.1 Inspection of existing underground building sewers for drain and reuse.
18-29-704 Drainage Piping and Installation.
18-29-704.1 Slope of horizontal drainage piping.
18-29-704.2 Change in size.
18-29-704.3 Connections to offsets and bases of stacks.
18-29-704.4 Future fixtures.
18-29-704.5 Dead ends.
18-29-704.5.1 Freezing.
18-29-704.5.2 Deliberately omitted.
18-29-705 Joints.
18-29-705.1 General.
18-29-705.2 Deliberately omitted.
18-29-705.3 Deliberately omitted.
18-29-705.4 Brass.
18-29-705.4.1 Brazed joints.
18-29-705.4.2 Mechanical joints.
18-29-705.4.3 Threaded joints.
18-29-705.4.4 Welded joints.
18-29-705.5 Cast iron.
18-29-705.5.1 Caulked joints.
18-29-705.5.2 Compression gasket joints.
18-29-705.5.3 Mechanical joint coupling.
18-29-705.6 Concrete joints.
18-29-705.7 Copper pipe.
18-29-705.7.1 Brazed joints.
18-29-705.7.2 Mechanical joints.
18-29-705.7.3 Soldered joints.
18-29-705.7.4 Threaded joints.
18-29-705.7.5 Welded joints.
18-29-705.8 Copper tubing.
18-29-705.8.1 Brazed joints.
18-29-705.8.2 Mechanical joints.
18-29-705.8.3 Soldered joints.
18-29-705.9 Borosilicate glass joints.
18-29-705.9.1 Caulked joints.
18-29-705.10 Steel.
18-29-705.10.1 Threaded joints.
18-29-705.10.2 Mechanical joints.
18-29-705.11 Deliberately omitted.
18-29-705.12 PVC plastic.
18-29-705.12.1 Mechanical joints.
18-29-705.12.2 Solvent cementing.
18-29-705.12.3 Threaded joints.
18-29-705.13 Vitrified clay.
18-29-705.14 Joints between different materials.
18-29-705.14.1 Copper or copper-alloy tubing to cast-iron hub pipe.
18-29-705.14.2 Copper or copper-alloy tubing to galvanized steel pipe.
18-29-705.14.3 Cast-iron pipe to galvanized steel or brass pipe.
18-29-705.14.4 Plastic pipe or tubing to other piping material.
18-29-705.14.5 Deliberately omitted.
18-29-705.14.6 Borosilicate glass to other materials.
18-29-705.15 Drainage slip joints.
18-29-705.16 Caulking ferrules.
18-29-705.17 Deliberately omitted.
18-29-706 Connections Between Drainage Piping And Fixtures.
18-29-706.1 Connections and changes in direction.
18-29-706.2 Obstructions.
18-29-706.3 Installation of fittings.
18-29-707 Prohibited Joints and Connections.
18-29-707.1 Prohibited joints.
18-29-708 Cleanouts.
18-29-708.1 Scope.
18-29-708.2 Cleanout plugs.
18-29-708.3 Where required.
18-29-708.3.1 Horizontal drains within buildings.
18-29-708.3.2 Building sewers.
18-29-708.3.3 Changes of direction.
18-29-708.3.4 Base of stack.
18-29-708.3.5 Building drain and building sewer junction.
18-29-708.3.6 Manholes.
18-29-708.4 Concealed piping.
18-29-708.5 Opening direction.
18-29-708.6 Prohibited installation.
18-29-708.7 Minimum size.
18-29-708.8 Pipes 8 inches and larger.
18-29-708.9 Clearances.
18-29-708.10 Access.
18-29-709 Fixture Units.
18-29-709.1 Values for fixtures.
18-29-709.2 Fixtures not listed in Table 18-29-709.1.
18-29-709.3 Values for continuous flow.
18-29-709.4 Deliberately omitted.
18-29-709.5 Values for indirect waste receptor.
18-29-710 Drainage System Sizing.
18-29-710.1 Maximum fixture unit load.
18-29-710.1.1 Maximum fixture units.
18-29-710.1.2 Minimum size.
18-29-710.1.3 Horizontal stack offsets.
18-29-710.1.4 Vertical stack offsets.
18-29-710.2 Future fixtures.
18-29-710.3 Underground drainage piping.
18-29-711 Offsets in Drainage Piping in Buildings of Five Stories or More.
18-29-711.1 Horizontal branch connections above or below vertical stack offsets.
18-29-711.1.1 Omission of vents for vertical stack offsets.
18-29-711.2 Horizontal branch connections to horizontal stack offsets.
18-29-711.3 Horizontal stack offsets.
18-29-711.3.1 Omission of vents for horizontal stack offsets.
18-29-711.3.2 Suds pressure zones.
18-29-711.3.2.1 Height.
18-29-711.3.2.2 Upstream.
18-29-711.3.2.3 Downstream.
18-29-711.4 Offsets below lowest branch.
18-29-712 Sumps and Ejectors.
18-29-712.1 Building drains below sewer.
18-29-712.2 Check and gate valve required.
18-29-712.3 Sump design.
18-29-712.3.1 Sump pump.
18-29-712.3.2 Sump pit.
18-29-712.3.3 Discharge piping.
18-29-712.3.4 Maximum effluent level.
18-29-712.3.5 Ejector connection to the drainage system.
18-29-712.4 Sewage pumps and sewage ejectors.
18-29-712.4.1 Capacity.
18-29-712.4.2 Duplex equipment required.
18-29-713 Health Care Plumbing.
18-29-713.1 Scope.
18-29-713.2 Bedpan washers and clinical sinks.
18-29-713.3 Indirect waste.
18-29-713.4 Vacuum system station.
18-29-713.5 Bottle system.
18-29-713.6 Central disposal system equipment.
18-29-713.7 Central vacuum or disposal systems.
18-29-713.7.1 Piping.
18-29-713.7.2 Velocity.
18-29-713.8 Vent connections prohibited.
18-29-713.9 Local vents and stacks for bedpan washers.
18-29-713.9.1 Multiple installations.
18-29-713.9.2 Trap required.
18-29-713.9.3 Trap seal maintenance.
18-29-713.10 Sterilizer vents and stacks.
18-29-713.10.1 Drainage.
18-29-713.11 Sterilizer vent stack sizes.
18-29-713.11.1 Bedpan steamers.
18-29-713.11.2 Boiling-type sterilizers.
18-29-713.11.3 Pressure sterilizers.
18-29-713.11.4 Pressure instrument washer sterilizer sizes.
18-29-714 Deliberately omitted.
18-29-715 Backwater Valves.
18-29-715.1 Sewage backflow.
18-29-715.2 Fixture branches.
18-29-715.3 Material.
18-29-715.4 Seal.
18-29-715.5 Diameter.
18-29-715.6 Location.
18-29-716 Flood Control.
18-29-716.1 Flood control devices.
18-29-716.2 Flood control systems.
Article 8. Indirect/Special Waste (18-29-801 et seq.)
Article 9. Vents (18-29-901 et seq.)
Article 10. Traps, Separators and Interceptors (18-29-1001 et seq.)
Article 11. Storm Drainage (18-29-1101 et seq.)
Article 12. Swimming Pools (18-29-1200 et seq.)
Article 13. Referenced Standards
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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18-29-710.1.4  Vertical stack offsets.
   Vertical stack offsets shall be sized as required for straight stacks in accordance with Table 18-29-710B, except when required to be sized as a building drain in accordance with Section 18-29-711.1.
18-29-710.2  Future fixtures.
   When provision is made for the future installation of fixtures, those provided for shall be considered in determining the required sizes of drain pipes. Construction to provide for such future installation shall be terminated with an approved cap or plug.
18-29-710.3  Underground drainage piping.
   Any portion of the drainage system installed underground or below a basement or cellar shall not be less than 4 inches (100 mm) in diameter.
Table 18-29-710A
Building Drains and Sewers
Diameter of Pipe (inches)
Maximum Number of Drainage Fixture Units Connected to any Portion of the Building Drain or the Building Sewer, Including Branches of the Building Draina
Slope per Foot
1/6 inch
1/8 inch
1/4 inch
1/2 inch
Diameter of Pipe (inches)
Maximum Number of Drainage Fixture Units Connected to any Portion of the Building Drain or the Building Sewer, Including Branches of the Building Draina
Slope per Foot
1/6 inch
1/8 inch
1/4 inch
1/2 inch
1 1/4
1
1
1 1/2
3
3
2
21
26
2 1/2
24
31
3
36
42
50
4
180
216
250
5
390
480
575
6
700
840
1,000
8
1,400
1,600
1,920
2,300
10
2,500
2,900
3,500
4,200
12
2,900
4,600
5,600
6,700
15
7,000
8,300
10,000
12,000
 
For SI: 1 inch = 25.4 mm, 1 inch per foot = 0.0833 mm/m.
a The minimum size of any building drain serving a water closet shall be 3 inches.
Table 18-29-710B
Horizontal Fixture Branches and Stacks a
Diameter of Pipe (inches)
Any Horizontal Fixture Branch
Maximum Number of Fixture Units that may be Connected to:
One Stack of 3 Stories in Height or 3 Intervals
More than 3 Stories in Height
Total for Stack
Total at One Story or Branch Interval
Diameter of Pipe (inches)
Any Horizontal Fixture Branch
Maximum Number of Fixture Units that may be Connected to:
One Stack of 3 Stories in Height or 3 Intervals
More than 3 Stories in Height
Total for Stack
Total at One Story or Branch Interval
1 1/2
3
4
8
2
2
6
10
24
6
2 1/2
12
20
42
9
3
20
30
60
16
4
160
240
500
90
5
360
540
1,100
200
6
620
960
1,900
350
8
1,400
2,200
3,600
600
10
2,500
3,800
5,600
1,000
12
3,900
6,000
8,400
1,500
15
7,000
 
For SI: 1 inch = 25.4 mm.
a Does not include branches of house drain.
18-29-711  Offsets in Drainage Piping in Buildings of Five Stories or More.
18-29-711.1  Horizontal branch connections above or below vertical stack offsets.
   If a horizontal branch connects to the stack within 2 feet (610 mm) above or below a vertical stack offset, and the offset is located more than four branch intervals below the top of the stack, the offset shall be vented in accordance with Section 18-29-915.
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