How often should plumbing supports be placed on horizontal pipes under 1" diameter?

Plumbing supports for horizontal pipes that are under 1 inch in diameter should be installed every 6 feet according to Massachusetts plumbing code requirements. This practice ensures that the pipes are adequately supported to maintain their position and to prevent sagging or potential damage that can result from inadequate support. Proper support also helps to minimize stress on connections and fittings, which can lead to leaks if not properly secured. Regular spacing at this interval ensures that the integrity of the plumbing system is maintained and supports the overall functioning of the piping network.

The other options suggest longer spacing, which may compromise the stability and performance of smaller diameter pipes. Each segment of piping should have adequate support to prevent movement due to thermal expansion, weight from accumulated water, and other factors that could affect pipe alignment over time. Thus, the 6-foot interval is not just a recommendation but a best practice in plumbing installations to ensure long-term reliability and safety.