Final answer:
The correct answer is option 3) 8 feet.Horizontally installed two-inch copper drain pipes should be supported at maximum intervals of 8 feet according to common plumbing codes.
Step-by-step explanation:
The intervals at which a two-inch copper drain pipe that is installed horizontally should be supported are determined by plumbing codes. Plumbing codes vary based on location, but a commonly accepted interval for copper pipes of this size is typically eight feet. That means supports should be installed at maximum intervals of eight feet to properly secure the drain pipe and prevent sagging or damage over time. Remember that understanding and adhering to local building codes is crucial in any construction or plumbing project, as these regulations are set in place to ensure safety, functionality, and durability of building practices.
According to plumbing codes and standards, two-inch copper drain pipes installed horizontally should be supported at intervals not exceeding 8 feet. This is to prevent sagging and ensure the proper functioning of the drainage system. Proper support also helps to maintain the structural integrity of the pipes over time.
Supporting the pipes at shorter intervals, such as 4 or 6 feet, may not be necessary and can lead to unnecessary costs and labor. On the other hand, longer intervals, such as 10 feet, may result in sagging and potential issues with drainage.