Restraints shall be provided for drain pipes at changes in direction for pipe sizes greater than what size?

In plumbing systems, proper restraint of drain pipes is essential to maintain their integrity and avoid issues such as leaks or structural failure. According to the International Plumbing Code, drain pipes that are larger than a specific diameter require additional support, particularly at points where the direction of the pipe changes.

For pipes that exceed 4 inches in diameter, the code stipulates that appropriate restraints must be in place at these changes. The larger diameter increases the risk of movement due to the weight of the waste within the pipe, potential shifting caused by settling, or thermal expansion and contraction. By installing restraints on pipes larger than this size, you ensure they remain securely positioned, which is crucial for effective drainage and preventing blockages.

Pipes that are 2 inches or 3 inches in size do not require these additional restraints at changes in direction, as they are generally lighter and less prone to movement compared to larger pipes. The code establishes this specification to enhance the safety and reliability of plumbing systems.