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All joints shall be gas-tight and water-tight, and no paint, varnish, or putty shall be permitted on the joint until after the joint has been tested and approved.
All threaded joints shall be American National Taper Pipe Thread, conforming to the standards listed in Section P-305. All burrs shall be removed. Pipe ends shall be reamed or filed out to the size of the bore, and all chips shall be removed. Pipe joint cement or paint shall be permitted on external threads only.
Cast iron-bell-and-spigot soil pipe shall be firmly packed with oakum or hemp and filled with molten lead not less than 1-inch deep which shall be run in one pouring and caulked tight when cold.
For acid-resisting cast iron pipe, joints similar to Section P-403.1 shall be made using white oakum in lieu of brown oakum or hemp.
Minimum dimensions for inside caulking connections shall be in accordance with Table P-403.

Size (Inches) Inside Diameter (Inches) Depth of Connection (Inches)
2 3 2-1/4
3 4-1/8 2-1/2
4 5-1/8 2-3/4
5 6-3/16 3
6 7-1/4 3
8 9-3/8 3-1/4
10 11-1/2 3-1/4
Gasket type joints in accordance with Section P-305 shall be permitted to join cast iron pipe outside of the building more than 10 feet beyond the building wall.
For the repair of existing drainage systems above ground, neoprene gaskets—with continuous stainless steel reinforcing bands—are permissible when joining approved piping.
Soldered joints for tubing and pipe shall be made with approved fittings. Surfaces to be soldered shall be cleaned bright. Joints shall be properly fluxed and soldered with approved materials listed in Chapter 3.
Flared joints for soft-copper water tubing shall be made with fittings meeting approved standards. The tubing shall be expanded with a proper flaring tool.
Pre-cast bituminous joints for clay or concrete sewer pipe shall be able to withstand a temperature of 160° F without softening so as to destroy the effectiveness of the joint, and shall not be soluble in any of the wastes carried by the drainage system. Pre-cast bituminous joint material shall:
  1. Bond firmly to the surface to which it is applied;
  2. Be accurately cast within the hub and on the spigot;
  3. Bond securely in the assembled joint; and
  4. Completely and evenly fill the annular space between the hub and spigot.
Mortar joints for clay sewer pipe or concrete sewer pipe shall be made by packing a closely twisted jute or oakum gasket of suitable size to pass around the pipe and lap at the top, into the annular space between the pipes. The remaining space shall be filled with firmly compacted mortar composed of one part portland cement and three parts mortar sand. The material for the mortar shall be mixed dry; only sufficient water shall be added to make the mixture workable. Lime putty or hydrated lime conforming to Type S of ASTM C207, equal to not more than 25% of the volume of portland cement, shall be permitted in the mortar.
O-ring and gasket-type joints in accordance with Section P-305 shall be permitted outside the building more than 10 feet from the building wall. This type of joint is permitted for joining cast iron pipe to clay pipe, and cast iron pipe to concrete sewer pipe.
Brazed joints shall be made in conformance to the standards listed in Section P-305.
In drainage piping, slip joints other than expansion joints shall be permitted in the waste pipe between the trap seal and the fixture.
Ground joint brass connections which allow adjustment of tubing but provide a rigid joint when made up shall not be considered slip joints.
Union and compression fittings shall be permitted in trap seals on the inlet side of the trap and to connect the fixture trap to the fixture drain line. These fittings shall be installed either at the wall line or floor line inside the room where the fixture is located.
Expansion joints of an approved type shall be permitted where necessary.
The joints between drainage pipes and water closets, trap standard service sinks, pedestal urinals, or other floor outlet connected fixtures with trap standards shall be made to the drainage piping by means of brass or iron flanges, caulked, soldered, threaded or by use of a gasket in accordance with Section P-305. The connection shall be bolted to the earthenware by means of a brass bolt between the base of the fixture and the connection. The floor flange shall be set on an approved, firm base. When supported on wood floor construction, flanges shall be securely fastened to the floor construction. Floor flanges shall not be less than 1/4-inch thick when of cast iron or galvanized malleable iron, and not less than 1/8-inch thick when of brass or hard lead used for repair only. The joints between roof drains and floor drains shall be connected to the drain lines in accordance with this Chapter or by using a gasket in accordance with Section P-305.
The types of joints prohibited above ground inside of a building are:
  1. No-hub coupling on copper to copper pipe;
  2. No-hub coupling on ABS or PVC.
No-hub pipe connections shall be prohibited below ground.
The types of joints permitted above ground inside of a building are:
  1. Cast iron hub stack to plastic with plastic to soil adapter;
  2. Cast iron hub stack to copper with adapter, lead and oakum joint;
  3. Cast iron hub stack to steel pipe, lead and oakum joint;
  4. Cast iron no-hub stack to plastic or copper with no-hub coupling;
  5. PVC connected to ABS with male and female adapters.
  6. No-hub coupling shall be permitted for ABS connected to PVC.
For repair of underground storm, sanitary or combined main drain lines, a double hub cast iron fitting shall be permitted with the approval of the Department. Such joints shall be properly caulked and supported.
In replacing a broken house trap, an approved mechanical type fitting shall be permitted on one side of the trap.
Under severe conditions, two fittings shall be permitted, with approval of the Department. The use of two fittings shall require concrete encasement on the street side.