Table of Contents
Limestone for Construction
Crushed limestone is one of the most versatile and widely used construction materials. It serves as an excellent base material for driveways, walkways, patios, and foundations due to its excellent compaction properties and drainage characteristics.
Limestone is formed from the remains of marine organisms and is composed primarily of calcium carbonate (CaCO3). When crushed, it compacts tightly and provides a stable, durable surface. Crushed limestone typically weighs between 2,500 and 2,800 pounds per cubic yard (1.25 to 1.4 tons).
Calculation Formula
Limestone Types & Uses
| Type | Size | Density (tons/yd³) | Best For |
|---|---|---|---|
| Crushed Limestone | 3/4" - 1" | 1.35 | Driveways, base layers |
| Dense Grade (DGA) | Dust - 1.5" | 1.40 | Road base, compacted surfaces |
| Limestone Screenings | Dust - 3/8" | 1.30 | Paver base, leveling |
| Limestone Chips | 3/8" - 3/4" | 1.25 | Decorative, drainage |
| Rip Rap Limestone | 6" - 24" | 1.35 | Erosion control, embankments |
Recommended Depths
| Application | Recommended Depth |
|---|---|
| Driveway (light traffic) | 4 - 6 inches |
| Driveway (heavy traffic) | 6 - 8 inches |
| Walking paths | 2 - 3 inches |
| Patio base | 4 - 6 inches |
| Foundation base | 4 - 8 inches |
| French drain fill | 12 - 18 inches |
Frequently Asked Questions
How many tons of limestone do I need for a driveway?
A typical driveway that is 50 feet long, 12 feet wide, and 4 inches deep requires approximately 200 cubic feet, or 7.4 cubic yards, which equals about 10 tons of crushed limestone. Always order 5-10% extra to account for spreading loss and compaction.
How much does a ton of limestone cover?
One ton of crushed limestone covers approximately 80 square feet at 3 inches deep, 60 square feet at 4 inches deep, or 40 square feet at 6 inches deep. Coverage varies slightly by limestone type and density.
Does limestone compact down?
Yes. Crushed limestone typically compacts down 20-30% from its loose volume. When ordering, consider that a 4-inch uncompacted layer will settle to approximately 3 inches after compaction. Plan accordingly by ordering the amount needed for the finished depth, as suppliers account for compaction in their weight estimates.