The building sewer shall be tar-coated extra-heavy
cast-iron soil pipe, asbestos cement sewer pipe or PVC heavy-wall
pipe (ASTM D3034, SDR-35-40). Any part of the building sewer that
is located within 10 feet of a water service pipe shall be constructed
of cast-iron soil pipe. Cast iron, or a sleeve, may be required by
the Enforcement Officer where the building sewer is located under
a driveway or where it is otherwise subject to unusual loadings.
All cast-iron soil pipe used for sewer laterals,
sewer risers or other purposes shall be extra-heavy grade (ASTM-A-74)
with double tar coating. Gaskets for cast-iron soil pipe shall be
made of preformed, properly vulcanized virgin rubber compound containing
no scrap or reclaim. Requirements for quality and performance characteristics
of positive-seal compression-type molded gaskets shall conform to
ASTM C564-68 and shall be for soil pipe manufactured to Commercial
Standard CS188-59. Installation of premolded gaskets shall follow
the requirements of the pipe manufacturers.
There shall be a cleanout located just inside
the building wall where the sewer pipe comes in, and also a cleanout
for every bend greater than 1/16 (22 1/2º) or lateral over 100
feet in length.
Whenever possible, the building sewer shall
be brought into the building at an elevation of at least one foot
above the basement floor. No building sewer shall be laid parallel
to and within three feet of any bearing wall, which might be weakened
from it. The sewer depth shall be sufficient to afford protection
from frost. The sewer shall be laid at uniform grade and in straight
alignment as far as possible, with changes in direction to be made
with properly curved pipe and fittings. No 90º angles will be
accepted horizontally; two 45º angles are to be used instead.
In all buildings in which any building drain
is too low to permit gravity flow to the public sewer, sewage or industrial
wastes carried by such drain shall be lifted by approved mechanical
means and discharged to the building sewer.