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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 it comes to which stone is better, crushed or natural gravel, it all depends on the project. Crushed stone is a great base and filler material for projects like retention walls, concrete slabs, driveways, pipes, and drains. Gravel is a common choice for visually attractive landscaping projects like walkways, above-ground drainage systems, patios, and garden borders.

The cost of 200 square feet of pea gravel depends on how deep your installation will be. The pea gravel material alone costs between $15 and $75 per cubic yard. You'll need just under two yards to cover 200 square feet to a depth of three inches, for a total cost of between $30 and $150.

While you can put gravel directly on dirt, it won’t be very stable. It also won’t block out any weeds. Most experts recommend layering weed barrier and a layer of packed sand or other foundation material to prevent the gravel from sinking into the earth and being overtaken by weeds.