What is the correct method for backfilling around pipes?

The correct method for backfilling around pipes involves replacing the material in 6-inch lifts up to 12 inches. This technique is crucial because it ensures that the soil around the pipes is compacted evenly and gradually, reducing the likelihood of settling or shifting once the project is completed. When backfilling in layers or lifts, materials can be compacted more effectively, which provides better support for the pipes and minimizes the risk of damage due to soil movement or water flow.

Backfilling all at once can lead to uneven settling and potential pipe displacement, as the weight of the fill material can put excessive pressure on the pipes. Not backfilling at all is impractical and can lead to exposure of the pipes to elements, potential failure, or damage. Using loose gravel as fill can compromise the surrounding support and shifting may occur, which is not ideal in maintaining the integrity of the plumbing system. Therefore, the method of backfilling in controlled lifts is important for ensuring long-term stability and performance of buried pipes.