How Much Gravel for a 40x80 Pole Barn?
How much gravel for a 40x80 pole barn: about 83.0 tons for a 6-inch pad covering the 3,200 square foot footprint. Many builders extend the pad a foot or two past the walls, which adds material.
Volume and tonnage calculator →The math
- Area: 3,200.0 sq ft.
- Depth in feet: 6 ÷ 12 = 0.500 ft.
- Cubic yards: 3,200.0 × 0.500 ÷ 27 = 59.26 yd³.
- Tons: × about 1.4 tons per yard = 83.0 tons.
The gravel calculator does this for any size.
Related: How Much Crushed Stone for a 40x80 Pole Barn?
Gravel needed by depth
| Depth | Cubic yards | Tons of gravel | Tons +10% |
|---|---|---|---|
| 4 in | 39.51 | 55.3 | 60.8 |
| 6 in | 59.26 | 83.0 | 91.3 |
| 8 in | 79.01 | 110.6 | 121.7 |
| 12 in | 118.52 | 165.9 | 182.5 |
How deep the barn pad should be
A 4-inch layer works for storage and light use on firm soil. For equipment, vehicles or a future concrete floor, 6 to 8 inches of compacted stone is common, and soft ground may need more plus fabric underneath.
Related: How Much #57 Stone for a 40x80 Pole Barn?
Extending the pad past the walls
Many owners run the stone 1 foot beyond each wall: 42x82 feet, 3,444 sq ft, about 89.3 tons at 6 inches. It keeps mud away from the doors and protects the post bases.
Layering the base
Remove sod and organic soil first. Compact the subgrade, then place and compact the stone in thin lifts. If the barn floor will be stone permanently, finish with a material that has fines so it packs firm.
Ordering and delivery
Most quarries and landscape yards deliver by the ton; ask whether there is a minimum and a delivery fee, and where the driver can dump without damaging your lawn. Gravel is a broad label, so confirm whether the yard means crushed or rounded stone and whether it carries fines. Round up by about 10 percent for compaction and uneven ground.
Questions people ask
How many tons of gravel for a 40x80 pole barn?
About 83.0 tons at 6 inches deep.
How many yards of gravel for a 40x80 pad?
About 59.26 cubic yards at 6 inches.
How deep should a pole barn gravel pad be?
About 4 inches for light use and 6 to 8 inches for vehicles or a future slab.
How many tons of gravel are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Should I put landscape fabric under the stone?
On soft or clay soil, a woven geotextile keeps stone from sinking into the dirt and makes the layer last longer.
Related guides
- Gravel for a Pole Barn Floor: Best Stone, Depth and Tons
- How Much Does a Ton of Gravel Cover? Depth Chart
- Tons to Cubic Yards for Gravel: Conversion Chart
- Crushed Stone vs Gravel: Differences and Best Uses
- Geotextile Fabric for Driveways: Woven vs Nonwoven and How Much You Need
- Compacting a Driveway Gravel Base in Lifts
- How Much Gravel for a 40x60 Pole Barn?
- How Much Gravel for a 40x64 Pole Barn?
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