Ideally 4”- 6” of ¾ crush gravel put down in 2”-3” lifts and tamped will be sufficient for a normal patio. Using .5” -1” of screenings on top will allow you to lay the stone level or with a small slope away from your house. Click Here for a link to the DIY network explaining fully how to build your own patio.
A yard is 27 Cubic feet so depending on the thickness, coverage will vary. Using the Landscape Material Calculator you can accurately determine the amount of aggregates you will need.
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