How Much Road Base for a 8x20 Shed Base?
How much road base for a 8x20 shed base: at 4 inches deep you need about 1.98 cubic yards, which is roughly 3.0 tons at 1.5 tons per yard. The shed base covers 160 square feet, so every inch of depth adds about 0.49 yards.
Volume and tonnage calculator →The math for a 8x20 shed base
- Area: 8 × 20 = 160 sq ft.
- Depth in feet: 4 ÷ 12 = 0.333 ft.
- Cubic feet: 160 × 0.333 = 53.3 cu ft.
- Cubic yards: ÷ 27 = 1.98 yd³.
- Tons: × 1.5 = 3.0 tons.
The volume and tonnage calculator does this for any size.
Road base needed by depth
| Depth | Cubic yards | Tons (approx.) | Tons +10% |
|---|---|---|---|
| 4 in | 1.98 | 3.0 | 3.3 |
| 6 in | 2.96 | 4.4 | 4.9 |
| 8 in | 3.95 | 5.9 | 6.5 |
About road base
Road base (also called base rock, ABC, or Class 2 base in different states) is a graded mix of stone and fines made to compact into a load-bearing layer. Weight per yard is a planning number; the scale ticket at the yard is the real one.
Preparing the shed base
Level the footprint, extend the stone a foot or so beyond the shed walls for drip and drainage, and compact in lifts. A timber or block border holds the pad shape. For a shed floor frame, the depths in the table above are a reasonable starting range.
Ordering tips
- Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
- Delivery size. 3.3 tons fits in a single typical dump truck load; small loads may carry a delivery fee. See how many tons of gravel in a dump truck.
- Bulk vs bags. At this size bulk delivery is usually the practical choice.
- Where it drops. Have the truck dump as close to the shed base as firm ground allows.
When to choose road base
Best suited to:
- Base under asphalt and concrete
- Gravel roads and drives
- Equipment and shed pads
Less suited to:
- Drainage layers
- Decorative surfaces
- Surfaces that will stay uncompacted
Quick reference numbers
- Per inch over 100 sq ft: about 0.46 tons of road base (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.6 tons.
- Another size for comparison: a 12x24 area at 3 inches takes about 4.0 tons.
- Weight used here: about 1.5 tons per cubic yard.
Common estimating mistakes
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Questions people ask
How many tons of road base for a 8x20 shed base?
About 3.0 tons at 4 inches deep, or 3.3 tons with 10 percent extra.
How many cubic yards is a 8x20 shed base at 4 inches?
About 1.98 cubic yards.
How much does a cubic yard of road base weigh?
Usually around 1.4 to 1.65 compacted tons, depending on stone size, fines and moisture.
How deep should road base be for a shed base?
The table above shows 4 to 8 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.
How many square feet is 8x20?
160 square feet.
Related guides
- Crushed Stone vs Gravel: Differences and Best Uses
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much Road Base for a 8x14 Shed Base?
- How Much Road Base for a 8x16 Shed Base?
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