(A) The house sanitary connection shall be six-inch vitrified clay, PVC or concrete pipe, except within five feet of the outside of a building it shall be of four-inch or six-inch cast iron pipe.
(B) All underground pipes when within four feet or less of the surface of the ground under a driveway shall be of cast iron pipe, PVC or of vitrified clay pipe having an envelope of concrete of a mix of 1:2:4 or better and at least three inches in thickness.
(C) (1) Where a connection or drain is laid at a distance less than five feet from the exterior wall of a building, or in ground where it will be subjected to vibration or to settlement, cast iron pipe shall be used.
(2) Where the ground is of sufficient solidity for a proper foundation or where special supports or secure foundation are provided, vitrified clay, PVC or concrete pipe or cast iron pipe may be used.
(Prior Code, § 51.042)