What is the minimum requirement for crushed stone under drainage tiles?

The minimum requirement for crushed stone under drainage tiles is typically 2 inches. This depth is essential to ensure proper drainage and to provide adequate support and stability for the tiles. A 2-inch layer of crushed stone allows water to flow freely around and beneath the tiles, facilitating effective drainage and minimizing the risk of clogs caused by soil infiltration or sediment buildup. Additionally, this thickness helps in creating a solid base that can withstand the pressure from the surrounding soil and any structures above, ensuring the long-term functionality of the drainage system.

While some may think other depths are suitable, they may lack the balance needed between drainage efficiency and structural integrity. Too little crushed stone may not offer sufficient drainage, while excessive amounts may become impractical or unnecessary for typical residential applications.