At what intervals must horizontal 1 1/2 inch and larger screwed and mechanical joint pipe be supported?

The proper support interval for horizontal 1 1/2 inch and larger screwed and mechanical joint pipe is 12 feet. This standard is grounded in plumbing codes and best practices that ensure the stability and safety of pipe installations.

When pipes are spaced appropriately, it helps to prevent sagging, which can lead to stress at joints and potential leaks. Additionally, supporting pipes at the correct intervals minimizes the risk of damage from vibrations and external forces.

While other intervals, like 6, 8, and 10 feet, may be suitable for different pipe types or sizes, they do not apply to 1 1/2 inch and larger pipes under normal operating conditions. The specification of 12 feet ensures both structural integrity and compliance with plumbing standards. This knowledge is critical for plumbers to maintain the quality and safety of plumbing systems.