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#4 limestone, also known as #4 stone, large crushed limestone, coarse limestone aggregate, or clean drainage stone, is a durable, angular rock commonly used for structural support, drainage, and site stabilization. It typically consists of limestone pieces approximately 1 to 2 inches in size, although exact gradation may vary by quarry and regional specification.
Its coarse size creates open spaces that allow water to move freely through the material, while the fractured edges help the stones interlock and resist shifting under traffic, runoff, and changing ground conditions. This combination provides dependable drainage without sacrificing load-bearing strength.
#4 limestone is popular for projects that require a larger, more stable aggregate than #57 stone while remaining easier to place than oversized stabilization rock. It performs well as a deep base, drainage layer, or reinforcement material in residential, commercial, agricultural, and construction applications.
Common Applications of #4 Limestone
- Driveway and road base reinforcement
- Culvert and drainage ditch stabilization
- Slope reinforcement and erosion control
- Construction entrances and equipment access areas
- Foundation and retaining wall backfill
- Drainage zones and stormwater systems
- Stabilization over soft or muddy ground
- Base layer beneath smaller crushed aggregate
