How should vertical sanitary piping be supported?

The correct approach for supporting vertical sanitary piping is to install it at maximum intervals specified by code. This method ensures that the pipes are securely held in place while allowing for movement due to thermal expansion and contraction, which can occur in plumbing systems. Proper support intervals are defined in plumbing codes to maintain the integrity of the system, prevent sagging, and reduce the risk of stress on the joints and connections. By adhering to these code specifications, plumbers ensure a safe, efficient, and compliant installation, which contributes to the overall reliability of the plumbing system.

Other methods, such as supporting at every joint or only at the base, could lead to unnecessary rigidity or increased stress on the connections, potentially resulting in leaks or failure. Moreover, random support based on accessibility does not align with professional standards and can compromise the system's performance and safety. Following code specifications provides a clear and standardized approach to supporting vertical sanitary piping effectively.