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About #57 Gravel Stone (P2). #57 Stone is an aggregate that is processed from natural durable materials. The size of #57 Stone spands from very small to 1 inch. #57 Stone is commonly used in mix concrete, mix asphalt and as bases for retaining walls and driveways.#57 Stone can also be applied in irrigation and on gravel roads.57 Stone is an aggregate that is processed from natural durable materials. The size of #57 Stone spands from very small to 1 inch. #57 Stone is commonly used in mix concrete, mix asphalt and as bases for retaining walls and driveways.
Gravel is a good choice for driveways. A gravel drive should have a first layer of baseball-sized stones at least 4 inches deep. According to Tim Carter of AskTheBuilder.com, each layer thereafter should be 4 inches thick and in gradually smaller stone. Compact each layer with a tamping machine, and cover with the final layer of crushed gravel for a depth of about 12 inches.