Rhode Island Journeyman Plumber Practice Exam

What type of earth should backfilling consist of?

1. Loose earth with rocks

2. Loose earth free from rocks and frozen chunks

3. Compact earth with concrete fragments

4. Liquid earth solution

The correct answer is: Loose earth free from rocks and frozen chunks

Backfilling is a crucial step in construction and plumbing, particularly when trenches or excavations are involved. The ideal material for backfilling should be loose earth that is free from rocks and frozen chunks. This is important to ensure that the soil can properly settle and compact over time, which helps to prevent future settling that can lead to cracks or destabilization in foundations or utility installations. Loose earth allows for better drainage and reduces the likelihood of voids or pockets forming once the backfill settles. If the soil contains rocks, it may not compact well and can create weak points in the backfill. Similarly, frozen chunks can thaw and lead to uneven settling, which can be detrimental over time. When selecting backfill material, it's essential to prioritize a uniform consistency that promotes stability and support for structures above. Thus, using loose earth that is free of obstructions ensures that the backfilled area can perform effectively as intended.