Recycled Concrete Aggregate for a 20x40 Parking Pad

A 20 by 40 foot parking pad is 800 square feet. How much recycled concrete aggregate for a 20x40 parking pad depends on depth: at 4 inches it is about 9.88 cubic yards or 12.8 tons. Suppliers usually sell by the ton, so the tonnage is the number to give them.

Volume and tonnage calculator →

The math for a 20x40 parking pad

Area: 20 × 40 = 800 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 800 × 0.333 = 266.7 cu ft.
Cubic yards: ÷ 27 = 9.88 yd³.
Tons: × 1.3 = 12.8 tons.

The volume and tonnage calculator does this for any size.

Recycled concrete aggregate needed by depth

Depth	Cubic yards	Tons (approx.)	Tons +10%
3 in	7.41	9.6	10.6
4 in	9.88	12.8	14.1
6 in	14.81	19.3	21.2

About recycled concrete aggregate

Ask whether the recycled concrete has been screened for rebar and debris. Fresh-crushed concrete can also be alkaline, so keep it away from sensitive plantings and streams. If the yard sells by the cubic yard instead of the ton, use the cubic-yard column directly.

Preparing the parking pad

Dig out organic soil, compact the subgrade and set an edge so the stone does not migrate onto the lawn. A pad that holds parked weight for long periods benefits from a dense base under the surface stone. For parked vehicles, 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. 14.1 tons may take more than one 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 parking pad as firm ground allows.

Where recycled concrete aggregate fits

Works well for:

Driveway and pad bases
Temporary construction entrances
Fill under slabs when compacted in lifts

Think twice for:

Near ponds, streams or sensitive plants, since fresh crush can raise pH
Decorative top layers
Drainage layers, unless the product is clean and screened

Quick reference numbers

Per inch over 100 sq ft: about 0.40 tons of recycled concrete aggregate (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.0 tons.
Another size for comparison: a 12x24 area at 3 inches takes about 3.5 tons.
Weight used here: about 1.3 tons per cubic yard.

Mistakes that throw off the order

Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.

Questions people ask

How many tons of recycled concrete aggregate for a 20x40 parking pad?

About 12.8 tons at 4 inches deep, or 14.1 tons with 10 percent extra.

How many cubic yards is a 20x40 parking pad at 4 inches?

About 9.88 cubic yards.

How much does a cubic yard of recycled concrete aggregate weigh?

Usually around 1.2 to 1.4 tons, depending on stone size, fines and moisture.

How deep should recycled concrete aggregate be for a parking pad?

The table above shows 3 to 6 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.

How many square feet is 20x40?

800 square feet.

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