For CPVC horizontal runs, support shall be provided at ______ foot intervals for pipe 1 inch or less in diameter.

For CPVC (Chlorinated Polyvinyl Chloride) horizontal runs, supporting the pipe at three-foot intervals is crucial to ensure safety and structural integrity. This specific requirement helps to prevent sagging and excessive bending of the pipe under its weight, especially when it's carrying liquids.

When pipes are not adequately supported, they can experience stress that may lead to cracks, leaks, or even failure over time. The three-foot interval for 1-inch or smaller diameter pipes is a standard that balances adequate support with practical considerations of installation and maintenance.

Choosing this specific interval also aligns with best practices seen in various plumbing codes and standards, which focus on maintaining the longevity of the piping system and preventing potential issues that could arise from insufficient support. Understanding the supporting requirements helps plumbers maintain compliance with regulations and ensures the reliability of the plumbing system they install.