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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.

Artificial turf usually requires some sort of base. If you’re installing the grass over soil, you’ll want to add a weed barrier (weeds can damage your fake grass) and an artificial grass sub-base . Typically, this is a mixture of gravel and sand, like crushed miscellaneous base (CMB) or decomposed granite. If you're placing turf over concrete, you can skip the sub base and use a padded underlayment.

Determining how many boulders you’ll need for your landscaping project depends on the area you need to cover and how big each boulder is. First, you’ll need to determine how big of an area you want covered, then divide that by the base surface area of the boulders. A landscape professional can help you determine how many boulders will be right for your project.

No one likes running out of materials during a project, so calculating the right amount of gravel needed for your driveway is an absolute must. Multiply your driveway’s length by width by the depth of the gravel (in feet). For gravel depth, convert to a decimal (i.e., 4 inches is 0.33 feet). This will give you the cubic feet of material that you need. 

If you’re looking for cubic yards, divide that above number by 27.