Building sewers shall be run in practical alignment
and at a uniform slope of not less than 1⁄4 inch per foot
(20.8 mm/m) toward the point of disposal.
Exception: Where approved by the Authority Having Jurisdiction and where it is impractical, due to the depth of the street sewer or to the structural features or to the arrangement of a building or structure, to obtain a slope of 1⁄4 inch per foot (20.8 mm/m), such pipe or piping 4 inches (100 mm) through 6 inches (150 mm) shall be permitted to have a slope of not less than 1⁄8 inch per foot (10.4 mm/m) and such piping 8 inches (200 mm) and larger shall be permitted to have a slope of not less than 1⁄16 inch per foot (5.2 mm/m).
Exception: Where approved by the Authority Having Jurisdiction and where it is impractical, due to the depth of the street sewer or to the structural features or to the arrangement of a building or structure, to obtain a slope of 1⁄4 inch per foot (20.8 mm/m), such pipe or piping 4 inches (100 mm) through 6 inches (150 mm) shall be permitted to have a slope of not less than 1⁄8 inch per foot (10.4 mm/m) and such piping 8 inches (200 mm) and larger shall be permitted to have a slope of not less than 1⁄16 inch per foot (5.2 mm/m).
Building sewer piping shall be laid on a
firm bed throughout its entire length, and such piping laid
in made or filled-in ground shall be laid on a bed of
approved materials and shall be properly supported as
required by the Authority Having Jurisdiction.
No building sewer or
other drainage piping or part thereof, which is constructed
of materials other than those approved for use under or
within a building, shall be installed under or within 2 feet
(610 mm) of a building or structure, or part thereof, nor less
than 1 foot (305 mm) below the surface of the ground. The
provisions of this subsection include structures such as
porches and steps, whether covered or uncovered; breezeways;
roofed porte cocheres; roofed patios; carports;
covered walks; covered driveways; and similar structures or
appurtenances.