How Many Tons Is an 8-Inch Gravel Base?

Eight inches of gravel under 1,000 square feet is about 24.7 cubic yards and about 35 tons at 1.4 tons per cubic yard. Place it in more than one lift so the bottom compacts. Eight inches is a planning depth, not a code minimum. The quarry ticket is the real weight.

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Double the four-inch stone, plus rounding

Eight inches is two-thirds of a foot. On 1,000 square feet, multiply 1,000 by 8 divided by 12, then divide by 27. That is about 667 cubic feet divided by 27, or about 24.7 cubic yards. At about 1.4 tons per cubic yard, 24.7 times 1.4 is about 34.6, stated as about 35 tons. A four-inch base on the same area is about 17 tons, and eight inches is about twice that, with rounding. A six-inch base is about 26 tons, and the extra two inches toward eight are the rest of the gap. Use the direct volume rather than stacking rounded tons if you need a closer check. This is a planning estimate. The quarry ticket is the real weight of the stone, which may not be exactly 1.4 tons per yard.

The bottom lift is the point

Place eight inches in more than one lift so the bottom actually compacts. A walk-behind plate packs a thin lift, on the order of a few inches of loose stone, not a 10-inch loose pile that you hope will densify because you made extra passes. A roller may take a thicker lift than a plate, and you still should not dump the whole eight inches loose and drive away. If the lower stone stays loose, the asphalt above it, however carefully weighed at 145 pounds per cubic foot, will settle. Check thickness at the finished grade, not at the top of a fluffy pile. Split the order in your notes if two different stones are used, such as a coarse bottom and a tighter cap, and add those tons only after each layer has its own thickness.

Do not promote eight inches into a law

Do not call eight inches a code minimum. It is a heavier planning section for a driveway base conversation. Soil and loads still decide what gets built. About 35 tons per 1,000 square feet becomes about 17.5 tons on 500 square feet and about 70 tons on 2,000, because the area scales and the depth stays. Extra width beyond the asphalt is extra area and extra tons. Measure it. If the quarry gives a unit weight other than 1.4, multiply the 24.7 cubic yards by that number and retire the 35. Keep the hot-mix order separate. When the stone is down and compacted, the tickets you hold are the weight that arrived, and the grade you measured is the thickness you built.

A practical sequence

Treat eight inches as 8 divided by 12 feet of finished thickness.
For 1,000 square feet, plan about 24.7 cubic yards, or about 35 tons.
Place the stone in more than one lift so the bottom compacts.
Do not call eight inches a code minimum, and confirm weight on the quarry ticket.

The mistake to skip

Dumping eight inches of loose stone in one pile and compacting only the top.

Questions people ask

How many tons is an 8-inch base per 1,000 square feet?

About 35 tons. The volume is about 24.7 cubic yards, and 24.7 times about 1.4 is about 35. That is a planning estimate at a finished thickness. The quarry ticket is the real weight. Place the stone in lifts so the lower part actually compacts.

Is eight inches required under a driveway?

No. It is a planning depth for a heavier base conversation, not a code minimum. The soil and the vehicles decide the section. This math only turns the depth you chose into cubic yards and planning tons at about 1.4 tons per cubic yard. The quarry ticket is the real weight.

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