Sec. 8. Floor Drains. - Floor or other drains will only be permitted when it can be shown to the satisfaction of the department of building that their use is absolutely necessary, and arrangements made to maintain a permanent water seal, and be provided with check or back-water valves.

Sec. 9. Weight and Thickness of Cast-iron Pipe. - All cast-iron pipes must be uncoated excepting all laid under ground, which shall be thoroughly tarred, sound, cylindrical and smooth, free from cracks, sand holes and other defects, and of uniform thickness and of grade known to commerce as extra heavy. Cast-iron pipe including the hub shall weigh not less than the following weights per linear foot:

2-inch pipe...............51⁄2 pounds per foot.
3-inch pipe...............91⁄2 pounds per foot.
4-inch pipe...............13 pounds per foot.
5-inch pipe...............17 pounds per foot.
6-inch pipe...............20 pounds per foot.
7-inch pipe...............27 pounds per foot.
8-inch pipe...............331⁄2 pounds per foot.
10-inch pipe...............45 pounds per foot.
12-inch pipe...............54 pounds per foot.

All cast-iron pipe must be tested to 50 pounds and marked with the maker's name.

All joints in cast-iron pipe must be made with picked oakum and molten lead and caulked gas-tight. Twelve ounces of soft pig lead must be used at each joint for each inch in the diameter of the pipe.

Sec. 10. Wrought-iron and Steel Pipe. - All wrought-iron and steel pipe shall be galvanized. Fittings used for drainage must be galvanized and of recess type known as drainage fittings. All fittings used for venting shall be galvanized and of the style known as steam pattern. No plain black pipe or fittings will be permitted.

Sec. 11. Sub-soil Drains. - Sub-soil drains must be discharged into a sump or receiving tank, the contents of which must be lifted and discharged into the drainage system above the cellar floor by some approved method. Where directly sewer-connected, they must be cut off from the rest of the building and plumbing system by a brass flap valve on the inlet to the catch basin and the trap on the drain from the catch basin must be water-supplied.

Sec. 12. Yard and Area Drains. - All yard, area and court drains when sewer-connected must have connection not less than 4 inches in diameter. They should be controlled by one trap - the leader trap if possible. All yards, areas and courts must be drained. Tenement houses and lodging houses must have yards, areas and courts drained into sewer.

Sec. 13. Use of Old Drains and Sewers. - Old house drains and sewers may be used in connection with new buildings or new plumbing, only when they are found, on examination by the department of building, to conform in all respects to the requirements governing new sewers and drains. All extensions to old house drains must be of extra heavy cast-iron pipe.

Sec. 14. Leader Pipes. - All building shall be provided with proper metallic leaders for conducting water from the roofs in such manner as shall protect the walls and foundations of such buildings from injury. In no case shall the water from such leaders be allowed to flow upon the sidewalk but the same shall be conducted by a pipe or pipes to the sewer. If there is no sewer in the street upon which such building fronts, then the water from said leader shall be conducted, by proper pipes below the surface of the sidewalk, to the street gutter.

Inside leaders shall be constructed of cast iron, wrought iron or steel, with roof connections made gas-and water-tight by means of heavy copper drawn tubing slipped into the pipe. The tubing must slip at least 7 inches into the pipe. Outside leaders may be of sheet metal, but they must connect with the house drain by means of cast-iron pipe extending vertically 5 feet above grade level, where the building is located along public driveways or sidewalks. Where the building is located off building line, and not liable to be damaged the connection shall be made with iron pipe extending 1 foot above the grade level.

All leaders must be trapped with running traps of cast iron, so placed as to prevent freezing.

Rain leaders must not be used as soil, waste or vent pipes, nor shall such pipes be used as rain leaders.

Sec. 15. - Exhaust from Steam Pipes, Etc. - No steam discharge or exhaust, blow-off or drip pipe shall connect with the sewer or the house drain, leader, soil pipe, waste or vent pipe. Such pipes shall discharge into a tank or condenser, from which suitable outlet to the sewer shall be made. Such condenser shall be supplied with water, to help condensation and help protect the sewer, and shall also be supplied with relief vent to carry off dry steam.

Sec. 16. Diameter of Soil Pipe. - The smallest diameter of soil pipe permitted to be used shall be 4 inches. The size of soil pipes must not be less than those set forth in the following tables.

Maximum number of fixtures connected to:

Size of pipeWaste and soil combinedSoil pipe alone
water closets
water closets

If the building is six (6) and less than twelve (12) stories in height, the diameter shall not be less than 5 inches. If more than twelve (12) it shall be 6 inches, in diameter. A building six (6) or more stories in height, with fixtures located below the sixth floor, soil pipe 4 inches in diameter will be allowed to extend through the roof provided the number of fixtures does not exceed the number given in the table. All soil pipes must extend at least 2 feet above the highest window, and must not be reduced in size. Traps will not be permitted on main, vertical, soil or waste-pipe lines. Each house must have a separate line of soil and vent pipes. No soil or waste line shall be constructed on the outside of a building.

Fixtures with:

  • 1–11⁄4-inch traps count as one fixture.
  • 1–11⁄2"traps count as one fixture.
  • 1–2"traps count as two fixtures.
  • 1–21⁄2"traps count as three fixtures.
  • 1–3"traps (water closets) count as four fixtures.
  • 1–4"traps count as five fixtures.

Sec. 17. Change in Direction. - All sewer, soil, and waste pipes must be as direct as possible. Changes in direction must be made with "Y"- or half "Y"-branches or one-eighth bends. Offsets in soil or waste pipes will not be permitted when they can be avoided, nor, in any case unless suitable provision is made to prevent the accumulation of rust or other obstruction. Offsets must be made with fourth degree bends or similar fittings. The use of T "Y"s (sanitary Ts) will be permitted on upright lines only.