What is the maximum interval for supporting a 4-inch PVC drainage pipe installed horizontally?

In plumbing, proper support for pipes is crucial to prevent sagging and ensure that they function effectively without causing leaks or stress on the joints. For a 4-inch PVC drainage pipe that is installed horizontally, the maximum interval between supports is 10 feet. This distance is mandated by plumbing codes to ensure the structural integrity and functionality of the drainage system.

Supporting the pipe at this interval helps prevent issues associated with sagging, such as blockages or improper drainage. The 10-foot rule applies specifically to the size and material of the pipe, which in this case, is 4-inch PVC. It's important for plumbers to adhere to these guidelines for mechanical and operational efficiency, as well as to comply with local plumbing codes.