#4 Stone (1 1/2″, Drainage, Leach Rock)

#4 Stone, 1 1/2” Size - Drainage, Leach Rock

#4 stone in a 1 1/2” size range is a coarse aggregate commonly used for drainage and leach field applications. Produced by crushing and screening natural rock, this material features angular edges that help it lock together while still allowing water to flow freely through the voids. The larger 1 1/2” size is specifically chosen for its superior drainage capabilities, making it ideal for situations where rapid water movement is essential.

This stone is frequently used in residential and commercial projects such as French drains, septic system leach fields, foundation drainage, and erosion control. Its size and angularity prevent compaction, ensuring that water does not become trapped and that systems remain functional over time. While #4 stone is excellent for drainage, it is not suitable for surfaces requiring compaction or a smooth finish, such as driveways or walkways. Its primary advantage is its reliability in managing water flow, making it a preferred choice for critical drainage and filtration applications.