How Much #57 Stone Under a 16x20 Deck?
A 16 by 20 foot deck covers 320 square feet. At 3 inches of #57 stone, plan on 2.96 cubic yards, or about 4.0 tons, which answers how much #57 stone under a 16x20 deck.
Volume and tonnage calculator →The math
- Area: 320.0 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 320.0 × 0.250 ÷ 27 = 2.96 yd³.
- Tons: × about 1.35 tons per yard = 4.0 tons.
The crushed stone calculator does this for any size.
Related: How Much Pea Gravel Under a 16x20 Deck?
#57 stone needed by depth
| Depth | Cubic yards | Tons of #57 stone | Tons +10% |
|---|---|---|---|
| 2 in | 1.98 | 2.7 | 2.9 |
| 3 in | 2.96 | 4.0 | 4.4 |
| 4 in | 3.95 | 5.3 | 5.9 |
| 6 in | 5.93 | 8.0 | 8.8 |
Deck tips
Under a deck, stone is a weed and moisture barrier rather than a structural layer. Slope the soil away from the house, lay fabric and spread 2 to 3 inches of washed stone that drains quickly.
Related: How Much #57 Stone Under a 12x20 Deck?
Before the stone goes in
Clear vegetation, rake the soil level and compact it. Lay fabric overlapped at the seams and set edging before spreading the stone.
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. #57 is a washed stone of roughly 1/2 to 1 inch with few fines; it drains fast but stays a little loose on its own. Ask your supplier for their own tons-per-yard number, since stone source and moisture change it.
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
People often forget that compaction reduces volume, so they come up short. Others order clean, round stone where a packable crushed stone with fines would have stayed put. Finally, dumping the whole load in one pile far from the work area adds hours of wheelbarrow trips.
Questions people ask
How many tons of #57 stone under a 16x20 deck?
About 4.0 tons at 3 inches deep.
How many yards of #57 stone under a 16x20 deck?
About 2.96 cubic yards.
How many tons of #57 stone are in a cubic yard?
Roughly 1.35 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 Under a Deck: Weeds, Drainage, and Depth
- 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 Under a 16x20 Deck?
- How Much Crushed Stone Under a 16x20 Deck?
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