Every house drain or private sewer which passes under a house or building or within three feet of the cellar wall of any house or building shall be cast-iron pipe.
A cast-iron running trap, in no case less than four inches with two cleanout hubs, shall be placed in the house drain either inside or outside the foundation on the sewer side of all connections, except a Y-fitting, to receive the discharge of an automatic sewage ejector, oil separator or boiler blowoff where they are used. If placed below the cellar floor or in a driveway, the trap shall be made accessible, in a suitable masonry manhole with iron cover.
A fresh-air inlet pipe shall be connected with the house drain just inside the house trap, with a separate fitting in the drain, and extended to the outer air, terminating with a return bend with open end one foot above the surface of the ground, or through foundation wall with quarter bend looking down in a location approved by the Building Inspector and shown on plans.
For a four-inch house drain, the fresh-air inlet shall be four inches.
For five-inch and six-inch house drains, the fresh-air inlet shall be not less than four inches.
For seven-inch and eight-inch house drains, the fresh-air inlet shall be not less than six inches.
For ten-inch and twelve-inch house drains, the fresh-air inlet shall be not less than eight inches.
Every building shall be kept provided with proper metallic gutters and rain leaders for conducting water from all roofs in such manner as shall protect the walls and foundation from injury. In no case shall the water from any rain leader be allowed to flow upon the adjoining property.
Outside leaders may be made of sheet metal.
Where there are more than two water closets on a line, all underground piping shall be a minimum of four-inch standard cast iron to the first water closet, then stepped down to three-inch standard cast iron below ground or three-inch PVC if above ground to the other water closets.
Where there are two or less water closets on a line, all underground piping to both shall be a minimum of three-inch cast iron.