Which pipe material requires the most horizontal support when installed?

PVC (Polyvinyl Chloride) pipe is known for being lightweight and versatile, making it a popular choice in various plumbing applications. However, when it comes to the installation of PVC, it requires more horizontal support compared to some other pipe materials. This is mainly due to the fact that PVC can be more susceptible to bending and sagging when spans between supports are too long. If not properly supported, long stretches of PVC can lead to structural issues, including potential leaks or breakage over time.

Proper installation typically requires horizontal supports at regular intervals to ensure the integrity of the system. The recommended support spacing can be influenced by factors like the diameter of the pipe and local building codes, but in general, the need for frequent horizontal support is one of the key considerations in working with PVC. This characteristic contrasts with materials like cast iron, which is heavier and often does not require as frequent support due to its rigidity, as well as ABS and CPVC, which can have varying support requirements based on their properties.