Which type of sewer pipes may run underneath driveways and sidewalks?

The correct choice regarding the type of sewer pipes that may run underneath driveways and sidewalks is sleeved or Schedule 80 pipes. These pipes are designed to withstand higher pressure and mechanical stress, which is essential when they are buried under heavy structures like driveways and sidewalks. They are often utilized where greater durability and resistance to impacts are required, making them suitable for these applications.

Schedule 80 pipes have thicker walls compared to Schedule 40 pipes, providing enhanced strength and protection from external forces that could potentially cause damage. This added durability is necessary when the pipes are located beneath solid surfaces that may face heavy traffic or other pressures.

In contrast, Schedule 40 pipes, though widely used for various drainage applications, may not provide the same level of strength and impact resistance as Schedule 80 pipes. Copper pipes, while used in some plumbing applications, do not function adequately as sewer pipes and are not typically installed underground in this context. PVC pipes are versatile and commonly used in drainage systems, but they may not possess the same structural integrity as Schedule 80, especially in environments where they will face significant pressure. Thus, sleeved or Schedule 80 pipes are the preferred choice for installations beneath driveways and sidewalks due to their superior durability.