Vertical copper pipe 1 1/4 inch and smaller shall be supported at what intervals?

In plumbing, especially when dealing with vertical copper pipes, proper support is crucial to ensure the pipe's stability and prevent sagging or movement that could lead to damage or leaks. For vertical pipes that are 1 1/4 inch and smaller, the regulations dictate that these should be supported at a maximum interval of every 10 feet.

This requirement is based on best practices to maintain structural integrity and facilitate maintenance. Supporting the pipes at this interval helps manage the weight of the liquid within, as well as the weight of the pipe itself.

The other options suggest either more frequent or less frequent support. While supporting at every floor level might seem like a thorough approach, it is not always necessary given the specified interval. Supporting every 5 feet would provide overly frequent support that is not required by code, while intervals of every 15 feet or even further could compromise the pipe's stability. Therefore, the regulation of supporting 1 1/4 inch and smaller vertical copper pipes every 10 feet strikes a balance between adequate support and practicality in installation.