What is the maximum depth of loose rock allowed beneath trenches for plumbing installations?

The maximum depth of loose rock allowed beneath trenches for plumbing installations is 3 inches. This specification is essential for ensuring the stability and safety of the plumbing systems being installed. Loose rock can create an uneven base that may lead to settling or shifting over time, potentially damaging the pipes or other components of the plumbing system.

By limiting the loose rock depth to 3 inches, the regulation aims to maintain a solid and stable support for the pipes, which is crucial for long-term functionality and reliability. A maximum limit also facilitates proper backfilling practices, ensuring that any voids or gaps created by loose materials do not compromise the integrity of the trench.