Basement Backfill Best Practices: Ensuring Proper Soil Selection and Compaction

After completing basement construction, prompt backfilling around the perimeter is crucial. Before commencing backfill, eliminate any accumulated water, loose soil, and construction debris. When employing soil-based backfill materials, prioritize the use of 30% gray soil, optimally-moistened bare soil, or sand soil. It is mandatory to conduct a test fill to verify suitability before proceeding. Strictly avoid substituting construction debris, silt (clay) soil, or cultivated soil for approved materials. Backfill should be evenly distributed, employing a symmetrical approach. Implement layered backfilling with each layer not exceeding 250mm in thickness. After compaction, the backfill soil should achieve a compaction coefficient of ≥0.94. During construction, prioritize avoiding damage to the waterproof layer.