1" clean limestone, also known as 1-inch washed limestone, clean crushed limestone, or drainage stone, is a durable, angular aggregate commonly used for drainage, structural support, and underground construction applications. It typically consists of washed limestone pieces around 1 inch in size, although exact gradation may vary by quarry and regional specification.
Because the stone contains little to no dust or fines, it creates open spaces that allow water to move freely through the aggregate. Its fractured edges help the pieces interlock and remain stable under load, providing a dependable combination of drainage, durability, and structural performance.
1" clean limestone is widely used where consistent water flow and long-term support are both important. Its size makes it suitable for placement around pipes, foundations, retaining walls, and septic systems, while its clean composition helps maintain drainage over time. DOT-approved material may also be available for roadway, municipal, and specification-driven construction projects.
Common Applications of 1" Clean Limestone
- French drains and drainage systems
- Septic and leach field installations
- Pipe bedding and utility trenches
- Retaining wall and foundation backfill
- Perimeter and subsurface drainage
- Stormwater and trench applications
- Structural support beneath slabs
- Municipal and commercial construction projects










