Drainage connections shall not be made
into a drainage piping system within 8 feet (2438 mm) of a
vertical to horizontal change of direction of a stack
containing suds-producing fixtures. Bathtubs, laundries,
washing machine standpipes, kitchen sinks, and dishwashers
shall be considered suds-producing fixtures. Where
parallel vent stacks are required, they shall connect to the
drainage stack at a point 8 feet (2438 mm) above the lowest
point of the drainage stack.
Exceptions:
Exceptions:
- Single-family residences
- Stacks receiving the discharge from less than three stories of plumbing fixtures