How thick should I lay pea gravel?
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If it's sandy or loose in consistency, you should add a layer of tamped-down packed stone above the soil. Here are your depth guidelines: Dig to an overall depth of about 2.5 inches if the soil will serve as the base. Dig to an overall depth of 4 to 4.5 inches if you're going to use tamped-down packed stone as a base.