Why is sand considered a good foundation material?

Sand is considered a good foundation material primarily because it possesses high drainage capabilities and can effectively distribute loads, contributing to overall stability. The granular nature of sand allows water to flow through it easily, preventing the accumulation of excess moisture that could lead to settlement or instability in the foundation. When foundation materials retain water, they can lead to heaving or loss of strength, making sandy soil preferable for construction projects.

In addition, sand typically has fairly good structural strength when properly compacted, which enhances its load-bearing capacity without causing excessive settlement over time. This combination of good drainage and strength makes sand a reliable choice for creating stable foundations, especially in areas where water management is critical.