The 2009 IPC code requires 1 1/4" and smaller copper tubing to be supported every ______ feet.

The 2009 IPC code requires 1 1/4" and smaller copper tubing to be supported every ______ feet.

• A. 4
• B. 8
• C. 12
• D. 6

Answer: (D)

The important idea is how often copper tubing must be supported to prevent sagging and movement. For copper tubing that is 1 1/4 inches in diameter or smaller, the plumbing code sets a maximum spacing of six feet between supports. This keeps the pipe from bending under its own weight, the weight of the water, or minor shifts in the building, and it helps protect joints from stress over time. So a run of this small copper tube should have a support at least every six feet, rather than more or less. The other options would either require supports more frequently than necessary or allow spacing that’s too wide for this size pipe, which is why six feet is the correct spacing.

The important idea is how often copper tubing must be supported to prevent sagging and movement. For copper tubing that is 1 1/4 inches in diameter or smaller, the plumbing code sets a maximum spacing of six feet between supports. This keeps the pipe from bending under its own weight, the weight of the water, or minor shifts in the building, and it helps protect joints from stress over time. So a run of this small copper tube should have a support at least every six feet, rather than more or less. The other options would either require supports more frequently than necessary or allow spacing that’s too wide for this size pipe, which is why six feet is the correct spacing.