How Much Pea Gravel for a 12x12 Greenhouse Floor?
How much pea gravel for a 12x12 greenhouse floor: about 1.9 tons at 3 inches deep. The area is 144 square feet, which is 1.33 cubic yards at that depth.
Volume and tonnage calculator →The math
- Area: 144.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 144.0 × 0.250 ÷ 27 = 1.33 yd³.
- Tons: × about 1.4 tons per yard = 1.9 tons.
The gravel calculator does this for any size.
Related: How Much Gravel for a 12x12 Greenhouse Floor?
Pea gravel needed by depth
| Depth | Cubic yards | Tons of pea gravel | Tons +10% |
|---|---|---|---|
| 2 in | 0.89 | 1.2 | 1.4 |
| 3 in | 1.33 | 1.9 | 2.1 |
| 4 in | 1.78 | 2.5 | 2.7 |
| 6 in | 2.67 | 3.7 | 4.1 |
Greenhouse tips
Greenhouse floors need to drain. A few inches of washed stone over landscape fabric keeps roots and weeds down and dries quickly after watering. Avoid stone with a lot of fines, which can turn muddy.
Related: How Much Crushed Stone for a 12x12 Greenhouse Floor?
Before the stone goes in
Remove sod and roots, level the area and slope it slightly for drainage. Install edging so the stone stays inside the footprint.
Ordering and delivery
Small dump trucks commonly carry around 5 to 10 tons and tri-axles more, but loads vary by truck and state, so ask the yard what fits in one trip. Pea gravel is small and rounded, comfortable underfoot, and needs edging because it rolls. Ask your supplier for their own tons-per-yard number, since stone source and moisture change it.
Tools for the job
A flat shovel, a steel rake, a wheelbarrow and a rented plate compactor cover most residential pads. A landscape rake or the back of a rake levels the top layer, and a long straightedge or a level string shows high and low spots before the final pass.
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 pea gravel for a 12x12 greenhouse floor?
About 1.9 tons at 3 inches deep.
How many yards of pea gravel for a 12x12 greenhouse floor?
About 1.33 cubic yards.
How many tons of pea 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 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 Crushed Stone for a 10x16 Greenhouse Floor?
- How Much #57 Stone for a 10x16 Greenhouse Floor?
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