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#78 limestone, also known as #78 stone, small washed limestone, clean limestone chips, or fine drainage stone, is a clean, angular crushed aggregate commonly used for concrete, drainage, landscaping, and light-duty surface applications. It generally consists of small, consistently sized limestone pieces around 3/8 inch, although the exact gradation and top size may vary by quarry and regional specification.
Because #78 limestone typically contains little to no stone dust or fines, it leaves small open spaces between the particles that allow water to pass through. Its fractured, angular shape helps the stone settle together and resist movement more effectively than smooth, rounded gravel while maintaining a neat, uniform appearance.
#78 limestone is popular for projects that require a smaller aggregate than #57 limestone without using screenings or dense-grade base material. Its compact size makes it easy to spread around pipes, landscape features, concrete forms, and narrow work areas. It also creates a smoother walking and finished surface than larger crushed stone, making it suitable for visible residential and commercial applications.
Common Applications of #78 Limestone
- Concrete and asphalt aggregate blends
- Pipe bedding and narrow utility trenches
- Drainage around foundations and landscape features
- Walkways, garden paths, and pedestrian areas
- Decorative landscape beds and hardscape accents
- Driveway and parking-area top dressing
- Drainage beneath patios and outdoor surfaces
- Small grading and surface-finishing projects
