Plastic pipe must be supported at intervals of:

Plastic pipe must be supported at intervals of no more than 4 feet to ensure proper alignment and to prevent sagging, which can lead to stress and potential damage to the pipe. This support specification is critical for maintaining the integrity of the plumbing system and ensuring the longevity of the piping materials. Adequate support minimizes movement and vibrations that can arise from flowing water or thermal expansion, which can cause leaking or failure over time. Recognizing this support requirement is essential for plumbers to ensure compliance with building codes and best practices in plumbing installations.