How Much Gravel for an 8x12 Greenhouse Floor?
An 8 by 12 foot greenhouse covers 96 square feet. At 3 inches of gravel, plan on 0.89 cubic yards, or about 1.2 tons, which answers how much gravel for an 8x12 greenhouse floor.
Volume and tonnage calculator →The math
- Area: 96.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 96.0 × 0.250 ÷ 27 = 0.89 yd³.
- Tons: × about 1.4 tons per yard = 1.2 tons.
The gravel calculator does this for any size.
Related: How Much Crushed Stone for an 8x12 Greenhouse Floor?
Gravel needed by depth
| Depth | Cubic yards | Tons of gravel | Tons +10% |
|---|---|---|---|
| 2 in | 0.59 | 0.8 | 0.9 |
| 3 in | 0.89 | 1.2 | 1.4 |
| 4 in | 1.19 | 1.7 | 1.8 |
| 6 in | 1.78 | 2.5 | 2.7 |
Building the greenhouse base
A stone floor drains spilled water, holds some heat and is easy to rake clean. Many growers use about 3 inches of pea gravel or washed stone over fabric, with paver or concrete stepping paths if they roll carts.
Related: How Much #57 Stone for an 8x12 Greenhouse Floor?
Prep
Remove sod and roots, level the area and slope it slightly for drainage. Install edging so the stone stays inside the footprint.
Getting it delivered
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. The scale ticket is the real weight; tons per yard here is a planning figure.
Planning the cost
Quarries and landscape suppliers set their own prices, and they change by region and season. Get the price per ton, the delivery fee and the minimum order. If two products will both work, compare cost per square foot at your depth rather than cost per ton.
Common mistakes
The most frequent problem is ordering for the finished depth without allowing for compaction, which can shrink a loose layer by 10 to 20 percent. Another is skipping fabric on soft soil and watching the stone vanish into the mud over the first wet season. Spreading everything in one thick layer instead of compacted lifts also leaves a soft, rutted surface.
Questions people ask
How many tons of gravel for an 8x12 greenhouse floor?
About 1.2 tons at 3 inches deep.
How many yards of gravel for an 8x12 greenhouse floor?
About 0.89 cubic yards.
How many tons of gravel are in a cubic yard?
Roughly 1.4 tons for planning, but suppliers vary with stone size and moisture.
Do I need to compact it?
Yes for anything that carries weight. Compact in lifts of a few inches with a plate compactor.
Related guides
- Gravel for a Greenhouse 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 #57 Stone for an 8x10 Greenhouse Floor?
- How Much Pea Gravel for an 8x12 Greenhouse Floor?
As an Amazon Associate, AsphaltTons.com earns from qualifying purchases. Product links below are sponsored.