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3-inch clean limestone, also known as 3-inch washed limestone, large clean stone, coarse drainage stone, or oversized crushed limestone, is a durable angular aggregate used for heavy-duty drainage, stabilization, and structural support. It typically consists of washed limestone pieces around 2 to 3 inches in size, although exact gradation may vary by quarry and regional specification.
Because the material contains little to no stone dust or fines, it creates large open spaces that allow water to move through quickly and efficiently. Its rough, fractured edges help the stone interlock and remain stable under heavy loads, flowing water, and changing ground conditions.
3-inch clean limestone is commonly selected for projects that require greater drainage capacity and more substantial support than smaller clean stone. It performs well beneath roads, around large pipes and culverts, behind retaining structures, and across soft or erosion-prone areas where long-term stability and washout resistance are important.
Common Applications of 3-Inch Clean Limestone
- Stormwater management and high-flow drainage systems
- Culvert bedding and outlet protection
- Pipe bedding and large utility installations
- Retaining wall and foundation backfill
- Slope stabilization and erosion-control projects
- Construction entrances and heavy-equipment access areas
- Equipment pads and staging areas
- Base layer over soft or unstable ground
