Recycled Concrete Aggregate for a 30x40 Parking Pad

How much recycled concrete aggregate for a 30x40 parking pad is a quick volume problem. 1,200 square feet at 4 inches comes to 14.81 cubic yards. Recycled concrete aggregate usually weighs about 1.2 to 1.4 tons per cubic yard, so plan on roughly 19.3 tons.

Volume and tonnage calculator →

The math for a 30x40 parking pad

Area: 30 × 40 = 1,200 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 1,200 × 0.333 = 400.0 cu ft.
Cubic yards: ÷ 27 = 14.81 yd³.
Tons: × 1.3 = 19.3 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	11.11	14.4	15.9
4 in	14.81	19.3	21.2
6 in	22.22	28.9	31.8

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. This parking pad sees parked vehicles, so match the depth to that load rather than to the minimum.

Ordering tips

Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
Delivery size. 21.2 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 10x20 area at 4 inches takes about 3.2 tons.
Weight used here: about 1.3 tons per cubic yard.

Mistakes that throw off the order

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.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.

Questions people ask

How many tons of recycled concrete aggregate for a 30x40 parking pad?

About 19.3 tons at 4 inches deep, or 21.2 tons with 10 percent extra.

How many cubic yards is a 30x40 parking pad at 4 inches?

About 14.81 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 30x40?

1,200 square feet.

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