CSLB C-36 Plumbing ContractorRough-in PlumbingMedium
A plumbing contractor is preparing to backfill a trench containing a newly installed 2-inch copper water service pipe under a private driveway. What is the minimum depth of cover required for this pipe?
- A12 inches
- B24 inches
- C18 inches
- D30 inches
Show answer & explanationAnswer & explanation
Correct answer: B. 24 inches
According to the California Plumbing Code (CPC), water service pipes installed under a private driveway must have a minimum depth of cover of 24 inches (2 feet) to protect them from damage due to vehicle traffic and frost.
Why the other options are wrong
- A. This depth is typically for water service pipes not under driveways or public ways, and in non-frost prone areas.
- C. This depth is not a standard minimum for water service pipes under driveways.
- D. This depth is often required for water mains under public streets, not typically for private driveways.
Underground Water Service Cover (Driveway)
Minimum earth cover required for water service pipes installed beneath driveways to protect them from damage.
- Protects against vehicle loads.
- Protects against freezing temperatures.
- Code-mandated for safety and longevity.
Memory trick: Bury your pipes deep, especially where cars creep.