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Pea gravel consists of many small, rounded stones that, unsurprisingly, kind of resemble peas. They range in size from 1/8 to 3/8 of an inch. Higher-end products might be a little more uniform and have fewer jagged rocks in the mix.

A good driveway should have a solid base layer and a smooth surface layer of gravel. A base layer of larger gravel, around 1 to 2 inches, keeps the foundation stable and helps with drainage. For the top layer, smaller gravel, about 1/4 to 1/2 inches, compacts well and creates an even surface that’s easier to drive on. Using both ensures the driveway stays durable, drains properly, and doesn’t shift over time.

When laying gravel, it's often a good idea to apply a base layer, such as sand or crushed concrete. You may also want to layer a weed-blocking membrane on top of the base layer to prevent weeds and grass from sprouting up in your gravel driveway. Without the appropriate base layer, the gravel you lay may sink into the soil.

How much 4 yards of dirt will cover depends on how deep you want the soil to be. In general, a yard of dirt will cover 324 square feet for a 1-inch depth or 100 square feet for a 3-inch depth. Therefore, you can expect 4 yards to cover between 400 and 1,296 square feet if you keep your soil depth between 1 and 3 inches.