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 being three inches is significant for ensuring proper drainage and structural integrity. Loose rock can create uneven surfaces and voids, which may lead to settling or shifting over time. Keeping the depth to a maximum of three inches helps promote a stable foundation for piping systems, minimizing the risk of damage due to movement or displacement.

In addition, adherence to this depth limit helps in preventing potential clogging or obstruction in the plumbing system. If the depth were greater, there could be a higher likelihood of rock shifting during installation or settling afterwards, which could affect the performance and longevity of the plumbing infrastructure. Ensuring that the maximum depth is limited to three inches balances the need for adequate support while mitigating those risks effectively.