How often must plastic pipe installed horizontally be supported?

The correct answer is grounded in the standards and practices associated with the installation of plastic piping. When installing horizontal plastic piping, it is essential to support the pipe to prevent sagging and ensure the integrity of the system. Supporting the pipe at intervals of every 4 feet is a common requirement as it provides sufficient support to the pipe while also accommodating thermal expansion and contraction that can occur with plastic materials.

This support interval helps to maintain the alignment and structural stability of the plumbing system, which is crucial for preventing leaks and ensuring long-term performance. The 4-foot interval aligns with many plumbing codes and manufacturer guidelines, reflecting industry standards for the proper handling of plastic materials in plumbing installations. Regular support at these intervals is vital for maintaining the system’s effectiveness and durability.