What is the maximum distance allowed from the end of a 1" copper line to the last hanger?

The maximum distance allowed from the end of a 1-inch copper line to the last hanger is established to ensure proper support and prevent sagging or stress on the piping system. A distance of 18 inches is commonly specified in plumbing and piping standards as it provides adequate support without compromising the structural integrity of the piping. It helps to reduce the risk of damage to the line, maintain alignment, and ensure that it performs effectively within the system.

The standards for hangers and supports are usually outlined in relevant plumbing codes, which emphasize the importance of maintaining adequate spacing based on the size and type of piping. For a 1-inch copper line, this 18-inch requirement strikes a balance between allowing for some flexibility of the pipe and ensuring it is securely supported, thus preventing potential issues like bending or thermal expansion complications.