Plastic pipe, when installed horizontally, must be supported at intervals not exceeding what distance?

When plastic pipe is installed horizontally, it is essential to provide adequate support to prevent sagging and damage over time. The correct distance for supporting plastic pipes is 4 feet. This standard ensures that the pipe maintains its integrity and functionality while allowing for expansion and contraction due to temperature changes.

Spacing supports too far apart could lead to unnecessary strain on the pipe, potentially resulting in cracking or failure. Therefore, adhering to the 4-foot support interval is crucial in maintaining the proper performance and longevity of plastic piping in plumbing installations.