International Residential Code (IRC) Plumbing Practice Test

The International Residential Code (IRC) specifies that the minimum pipe support spacing for horizontal copper tubing is 6 feet. This requirement is in place to ensure the structural integrity of the piping system, preventing sagging, bending, or other forms of stress that can lead to leaks or damages over time.

Proper support helps maintain alignment and prevents excessive movement due to thermal expansion and contraction, which is especially relevant for materials like copper that can expand and contract with changes in temperature. Adequate spacing also facilitates easier inspection and maintenance of the piping system.

While the other options provide different spacing distances, they do not meet the minimum safety and performance criteria established by the IRC for copper tubing. Thus, the choice of 6 feet is critical for ensuring effective support and longevity of the plumbing installation.