2B Limestone (¾"–1") — Sold By The Ton
2B limestone is a clean, crushed stone product made from natural limestone rock. The material typically ranges from about ¾ inch to 1 inch in size and contains very little to no stone dust or fines. Because the smaller particles have been removed during processing, the result is a clean, free-draining aggregate that remains loose rather than compacting tightly.
You may also hear this material referred to as 2B stone, clean ¾" limestone, washed limestone, or in some regions #57 limestone. Regardless of the name, the material is valued for its durability, drainage ability, and consistent size.
What It Looks Like
- Light gray to light tan limestone
- Angular crushed stone (not rounded like pea gravel)
- Stones typically ¾" to 1" in size
- Minimal fines or dust
Because the fines are removed, the stones do not bind together like compactable materials such as 2A limestone. Instead, they allow water to move through the gaps between the stones, which makes them ideal for drainage and surface applications.
Why People Choose 2B Limestone
- Excellent drainage due to its clean gradation
- Durable and weather resistant
- Angular stone provides some interlock for stability
- Low dust and cleaner surface appearance
- Versatile for construction, landscaping, and drainage projects
Since the stones remain somewhat loose, 2B limestone works best in applications where water movement and permeability are important.
Common Uses For 2B Limestone
Driveway Top Layer
2B limestone is commonly used as a top dressing for gravel driveways and parking areas. The angular stones help reduce shifting compared to rounded gravel while still allowing rainwater to drain through.
Drainage Systems
Because it contains very little dust or fines, this material is ideal for:
- French drains
- Foundation drainage systems
- Septic system backfill
- Utility trench bedding
The open spaces between stones allow water to move freely through the aggregate, helping prevent pooling and moisture buildup.
Landscaping and ground cover
2B limestone is often used as:
- Decorative ground cover
- Erosion control stone
- Landscape bed fill
- Base material under stepping stones
Its clean look and consistent size make it suitable for projects where both appearance and function matter.
Base under concrete or patios
In some projects, 2B limestone is installed beneath:
- Concrete slabs
- Patios and walkways
- Retaining walls
The stone creates a stable but permeable layer that helps manage moisture beneath structures.
When another material may work better
Because 2B limestone contains little to no fines, it does not compact tightly. For projects requiring a dense, solid base, materials such as 2A limestone or crusher run are often better choices.
Examples include:
- Heavy building foundations
- Areas requiring a tightly packed surface
- Smooth finished surfaces where loose stone is undesirable
Installation Tips
For best results when using 2B limestone:
- Install over properly graded and compacted soil
- Use a border or edging if installing in landscaping areas
- Spread evenly to maintain a consistent depth
- Consider adding a compactable base layer underneath for heavier traffic areas
Because the material remains loose, it may shift slightly under repeated traffic, but its angular shape helps maintain reasonable stability.
Technical Overview
| Property | Typical Value |
|---|---|
| Particle Size | ¾" – 1" |
| Fines Content | Minimal (<5%) |
| Gradation | Clean, uniformly sized crushed stone |
| Bulk Density | ~1.4 – 1.6 tons per cubic yard |
| Specific Gravity | ~2.6 – 2.8 |
| Absorption | Typically <2% |
| Color | Gray to light tan |
How It Compares To Other Aggregates
| Aggregate | Key Difference |
|---|---|
| 2A Limestone | Contains fines and compacts tightly; drains less than 2B |
| Pea Gravel | Rounded stones; more prone to shifting than crushed limestone |
| #57 Stone | Similar size but may vary slightly depending on regional standards |
| Crushed Concrete | Recycled material; properties may vary compared to natural limestone |
| Stone Dust / Sand |
Much finer material designed for tight compaction |
Summary
2B limestone (¾"–1") is a clean, durable aggregate commonly used for driveways, drainage systems, landscaping, and construction support layers. Its washed gradation and angular stone provide excellent drainage and moderate stability, making it a dependable choice for projects where water movement is important. However, because it contains little to no fines, it is not intended for applications that require tight compaction or a smooth finished surface.
