Where are slip joints permitted to be installed?

Slip joints are specifically designed to allow for easy disassembly and access for maintenance without cutting or damaging the installed pipes. Permitting slip joints only on the trap inlet and outlet and within the trap seal aligns with plumbing code requirements aimed at preventing leaks and maintaining the integrity of the drainage system.

The trap inlet and outlet are critical points in the plumbing system, where wastewater exits fixtures and enters the drainage piping. At these points, slip joints facilitate connection and disconnection for servicing the trap, which can often become clogged and require cleaning or replacement. Keeping slip joints limited to these locations helps maintain system effectiveness while adhering to safety and operational standards.

While vertical piping, junctions of two pipes, and plumbing fixture areas may seem plausible candidates for slip joint installations, they could compromise the system's operation. Uncontrolled movement in other areas can lead to leaks, pressure loss, or other integrity issues, which plumbing codes aim to avoid. Hence, restricting slip joint use to specific points is a strategic decision to ensure both functionality and reliability in plumbing installations.