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Chapter 7 — SANITARY DRAINAGE

705.2 Cast-Iron Pipe and Joints. Joining methods for

California Plumbing Code (Title 24, Part 5) · 2019 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

cast-iron pipe and fittings shall be installed in accordance with the manufacturer’s installation instructions and shall comply with Section 705.2.1 or Section 705.2.2.

178 2019 CALIFORNIA PLUMBING CODE

SANITARY DRAINAGE

TABLE 703.2 MAXIMUM UNIT LOADING AND MAXIMUM LENGTH OF DRAINAGE AND VENT PIPING

SIZE OF PIPE (inches) 11⁄4 11⁄2 2 3 4 5 6 8 10 12
Maximum Units
Drainage Piping1
Vertical
Horizontal

 1
1		 22
1		 163
83		 484
354		 256
2165		 600
4285		 1380
7205		 3600
26405		 5600
46805		 8400
82005
Maximum Length
Drainage Piping
Vertical, (feet)
Horizontal (unlimited)

 45 65 85 212 300 390 510 750 – –


Vent Piping
Horizontal and Vertical6
Maximum Units
Maximum Lengths, (feet)
1
45
83
60		 24
120		 84
212		 256
300		 600
390		 1380
510		 3600
750		 – –

Notes: 1 Excluding trap arm. 2 Except for sinks, urinals, and dishwashers – exceeding 1 fixture unit. 3 Except for six-unit traps or water closets. 4 Only four water closets or six-unit traps allowed on a vertical pipe or stack, and not to exceed three water closets or six-unit traps on a horizontal branch or drain. 5 Based on 1⁄4 inch per foot (20.8 mm/m) slope. For 1⁄8 of an inch per foot (10.4 mm/m) slope, multiply horizontal fixture units by a factor of 0.8. 6 The diameter of an individual vent shall be not less than 11⁄4 inches (32 mm) nor less than one-half the diameter of the drain to which it is connected. Fixture unit load values for drainage and vent piping shall be computed from Table 702.1 and Table 702.2(2). Not to exceed one-third of the total permitted length of a vent shall be permitted to be installed in a horizontal position. Where vents are increased one pipe size for their entire length, the maximum length limitations specified in this table do not apply. This table is in accordance with the requirements of Section 901.3.

ge and vent piping shall be computed from Table 702.1 and Table 702.2(2). Not to exceed one-third of the total permitted length of a vent shall be permitted to be installed in a horizontal position. Where vents are increased one pipe size for their entire length, the maximum length limitations specified in this table do not apply. This table is in accordance with the requirements of Section 901.3.

705.2.1 Caulked Joints. Caulked joints shall be firmly packed with oakum or hemp and filled with molten lead to a depth of not less than 1 inch (25.4 mm) in one continuous pour. The lead shall be caulked thoroughly at the inside and outside edges of the joint. After caulking, the finished joint shall not exceed 1 ⁄8 of an inch (3.2 mm) below the rim of the hub. No paint, varnish, or other coatings shall be permitted on the joining material until after the joint has been tested and approved. 705.2.2 Mechanical Joints and Compression Joints. Mechanical joints for cast-iron pipe and fittings shall be of the elastomeric compression type or mechanical joint couplings. Compression type joints with an elastomeric gasket for cast-iron hub and spigot pipe shall comply with ASTM C564 and be tested in accordance with ASTM C1563. Hub and spigot shall be clean and free of dirt, mud, sand, and foreign materials. Cut pipe shall be free from sharp edges. Fold and insert gasket into the hub. Lubricate the joint following manufacturer’s instructions. Insert spigot into hub until the spigot end of the pipe bottom out in the hub. Use the same procedure for the installation of fittings.

A mechanical joint shielded coupling type for hubless cast-iron pipe and fittings shall have a metallic shield that complies with ASTM A1056, ASTM C1277, ASTM C1540, or CISPI 310. The elastomeric gasket shall comply with ASTM C564. Hubless cast-iron pipe and fittings shall be clean and free of dirt, mud, sand, and foreign materials. Cut pipe shall be free from sharp edges. Gasket shall be placed on the end of the pipe or fitting and the stainless steel shield and clamp assembly on the end of the other pipe or fitting. Pipe or fittings shall be seated

against the center stop inside the elastomeric sleeve. Slide the stainless steel shield and clamp assembly into a position centered over the gasket and tighten. Bands shall be tightened using an approved calibrated torque wrench specifically set by the manufacturer of the couplings.

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▸Contents — California Plumbing Code (Title 24, Part 5)
California Plumbing Code (Title 24, Part 5)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — PLUMBING FIXTURES AND FIXTURE FITTINGS
  5. Chapter 5 — WATER HEATERS
  6. Chapter 6 — WATER SUPPLY AND DISTRIBUTION
  7. ▸Chapter 7 — SANITARY DRAINAGE
    Overview
    1. 701.2 Drainage Piping. Materials for drainage piping shall
    2. 701.4 Continuous Wastes. Continuous wastes and fixture
    3. 701.5 Lead. (See Table 1701.1) Sheet lead shall comply with
    4. 701.6 Caulking Ferrules. Caulking ferrules shall be manufactur…
    5. 701.7 Soldering Bushings. Soldering bushings shall be
    6. 701.3 Drainage Fittings. Materials for drainage fittings
    7. 702.0 Fixture Unit Equivalents.702.1 Trap Size. The unit equiv…
    8. 702.2 Intermittent Flow. Drainage fixture units for intermitte…
    9. 702.3 Continuous Flow. For a continuous flow into a
    10. 703.2 Maximum Number of Fixture Units. Table 703.2
    11. 703.3 Sizing per Appendix C. For alternate method of
    12. 704.2 Single Vertical Drainage Pipe. Two fixtures set
    13. 704.3 Commercial Sinks. Pot sinks, scullery sinks, dishwashing…
    14. 705.1 ABS and ABS Co-Extruded Plastic Pipe andJoints. Joining …
    15. 705.2 Cast-Iron Pipe and Joints. Joining methods for
    16. 705.3 Copper or Copper Alloy Pipe (DWV) andJoints. Joining met…
    17. 705.4 Galvanized Steel Pipe and Joints. Joining methods for ga…
    18. 705.5 Polyethylene (PE) Sewer Pipe. Polyethylene (PE)
    19. 705.6 PVC and PVC Co-Extruded Plastic Pipe andJoining Methods.…
    20. 705.7 Stainless Steel Pipe and Joints. Joining methods for sta…
    21. 705.8 Vitrified Clay Pipe and Joints. Joining methods
    22. 705.9 Special Joints. Special joints shall comply with Section…
    23. 705.10 Joints Between Various Materials. Joints
    24. 706.2 Horizontal to Vertical. Horizontal drainage lines,
    25. 706.3 Horizontal to Horizontal. Horizontal drainage lines
    26. 706.4 Vertical to Horizontal. Vertical drainage lines connecti…
    27. 707.0 Cleanouts.707.1 Plug. Each cleanout fitting for cast-iro…
    28. 707.2 Approved. Each cleanout fitting and each cleanout
    29. 707.3 Watertight and Gastight. Cleanouts shall be
    30. 707.4 Location. Each horizontal drainage pipe shall be provide…
    31. 707.5 Cleaning. Each cleanout shall be installed so that it
    32. 707.6 Extension. Each cleanout extension shall be considered a…
    33. 707.7 Interceptor. Each cleanout for an interceptor shall be
    34. 707.8 Access. Each cleanout, unless installed under an
    35. 707.9 Clearance. Each cleanout in piping 2 inches (50 mm)
    36. 707.10 Fittings. Cleanout fittings shall be not less in size
    37. 707.11 Pressure Drainage Systems. Cleanouts shall be
    38. 707.12 Countersunk Cleanout Plugs. Countersunk
    39. 707.13 Hubless Blind Plugs. Where a hubless blind plug
    40. 707.14 Trap Arms. Cleanouts for trap arms shall be installed
    41. 708.0 Grade of Horizontal Drainage Piping.708.1 General. Horiz…
    42. 710.0 Drainage of Fixtures Located Below the Next
    43. 710.2 Sewage Discharge. Drainage piping serving fixtures that …
    44. 710.3 Sewage Ejector and Pumps. A sewage ejector or
    45. 710.4 Discharge Line. The discharge line from such ejector, pu…
    46. 710.5 Size of Building Drains and Sewers. Building
    47. 710.6 Backwater Valves. Backwater valves, gate valves,
    48. 710.7 Drainage and Venting Systems. The drainage and
    49. 710.8 Sump and Receiving Tank Construction. Sumps
    50. 710.9 Alarm. Such sumps and receiving tanks shall be automatic…
    51. 710.10 Sump and Receiving Tank Covers and Vents.
    52. 710.11 Air Tanks. Air tanks shall be so proportioned as to be
    53. 710.12 Grinder Pump Ejector. Grinder pumps shall be
    54. 710.13 Macerating Toilet Systems and PumpedWaste Systems. Fixt…
    55. 712.2 Water Test. The water test shall be applied to the
    56. 712.3 Air Test. The air test shall be made by attaching an
    57. 713.2 Private Sewage Disposal System. Where no public sewer in…
    58. 713.3 Public Sewer. Within the limits prescribed by Section 71…
    59. 713.4 Public Sewer Availability. The public sewer shall be
    60. 711.0 Suds Relief.711.1 General. Drainage connections shall no…
    61. 713.5 Permit. No permit shall be issued for the installation,
    62. 713.6 Lot. On every lot or premises hereafter connected to
    63. 713.7 Installation. In cities, counties, or both where the
    64. 714.2 Prohibited Water Discharge. No rain, surface, or
    65. 714.3 Prohibited Sewer Connection. No cesspool, septic tank, s…
    66. 714.4 Commercial Food Waste Disposer. The Authority Having Jur…
    67. 714.5 Tanks. An approved type, watertight sewage or wastewater…
    68. 715.2 Joining Methods and Materials. Joining methods
    69. 715.3 Existing Sewers. Replacement of existing building
    70. 717.2 [AGR] Meat and Poultry Processing Plants. The
    71. 718.2 Support. Building sewer piping shall be laid on a firm
    72. 718.3 Protection from Damage. No building sewer or
    73. 719.2 No Additional Cleanouts. Where a building sewer
    74. 719.3 Building Sewer Cleanouts. Required building
    75. 719.4 Cleaning. Each cleanout shall be installed so that it
    76. 719.5 Access. Cleanouts installed under concrete or asphalt
    77. 719.6 Manholes. Approved manholes shall be permitted to
    78. 720.0 Sewer and Water Pipes.720.1 General. Building sewers or …
    79. 721.0 Location.721.1 Building Sewer. Except as provided in Sec…
    80. 721.2 Abutting Lot. Nothing contained in this code shall be
    81. 724.2 Toilet soil lines shall be separated from house drainage
    82. 726.2 Toilet soil lines shall be separated from house drainage
    83. 727.0 [OSHPD 1] Emergency Sanitary Drainage.727.1 For new acut…
    84. 722.2 Cesspools, Septic Tanks, and Seepage Pits. A
    85. 722.3 Filling. The top cover or arch over the cesspool, septic…
    86. 722.4 Ownership. No person owning or controlling a
    87. 722.5 Disposal Facilities. Where disposal facilities are
  8. Chapter 8 — INDIRECT WASTES
  9. Chapter 9 — VENTS
  10. Chapter 10 — TRAPS AND INTERCEPTORS
  11. Chapter 11 — STORM DRAINAGE
  12. Chapter 12 — FUEL GAS PIPING
  13. Chapter 13 — HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICA…
  14. Chapter 14 — FIRESTOP PROTECTION
  15. Chapter 15 — ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS
  16. Chapter 16 — NONPOTABLE RAINWATER CATCHMENT SYSTEMS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RECOMMENDED RULES FOR SIZING THE WATER SUPPLY SYS…
  19. Appendix B — EXPLANATORY NOTES ON COMBINATION WASTE AND VENT S…
  20. Appendix C — ALTERNATE PLUMBING SYSTEMS
  21. Appendix D — SIZING STORM WATER DRAINAGE SYSTEMS
  22. Appendix E — MANUFACTURED/MOBILE HOME PARKS AND RECREATIONAL V…
  23. Appendix F — FIREFIGHTER BREATHING AIR REPLENISHMENT SYSTEMS
  24. Appendix G — SIZING OF VENTING SYSTEMS
  25. Appendix H — PRIVATE SEWAGE DISPOSAL SYSTEMS
  26. Appendix I — INSTALLATION STANDARD FOR PEX TUBING SYSTEMS FOR …
  27. Appendix J — COMBINATION OF INDOOR AND OUTDOOR COMBUSTION AND …
  28. Appendix K — POTABLE RAINWATER CATCHMENT SYSTEMS
  29. Appendix L — SUSTAINABLE PRACTICES
  30. Appendix M — PEAK WATER DEMAND CALCULATOR

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