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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.

It can be tedious and time-consuming to install your own mulch and determine the ideal amount. A professional can help you ensure the right thickness and save you a lot of time and headaches.

The depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.

Each bag of mulch includes 2 cubic feet of mulch. And since a cubic yard is about 27 cubic feet of materials, you'll need 14 bags of mulch to have enough to cover a cubic yard. The right amount of mulch for your yard, however, depends on the depth of the mulch, the type of mulch you choose, and your desired look.