Experience shows that most foundation problems on fill soils arise from common mistakes that can be easily avoided with the right approach. Common mistakes developers make • Forgoing engineering surveys to save money is the most common and costly mistake. Without soil data, it's impossible to accurately calculate pile length and their bearing capacity. • Using short piles that don't reach dense soil is the second most common mistake. Developers choose standard 2.5-3 meter piles without considering the thickness of the backfill. As a result, the piles rest on soft soil and settle. • Installing piles immediately after backfilling, without allowing time for settling, causes the fresh backfill to compact under the piles, causing them to settle. The minimum curing period for backfill is 3-6 months with good compaction. • ...