Category Landscape Rock
Picking out landscaping rock is fun, but many landscape designers falter when it comes to doing the math. You may already know you’ll need several layers of river rock to create the look you want, yet you might be unsure of how high the decorative rock should be piled. The quantity of landscaping rocks you need will depend on the project, and you can use this information to help you get started with planning for how many inches of height you’ll need to include in your plans.

Measure the Area

You’ll first need to take a horizontal measurement of the area to determine how many inches of decorative rock you need for your project. This measurement is as simple as multiplying the length times the width of the area you want to cover. If the area has curves or hard-to-measure places, it may be helpful to add a few extra inches to your measurements.

Start with the General Rule for Height

For general landscaping projects, the rule of thumb is around two inches of depth for decorative rocks. This works well for mulching, since the river rocks will be deep enough to generate warmth without trapping too much moisture at the ground surface level. Larger decorative rocks might be placed in a single layer to achieve this general height. You may also need to increase the depth of the decorative rocks if you’re working on a special project.

Add More Inches for Areas with Heavy Use

Landscaping rocks, such as grey or snow white pebbles, are beautiful in driveways and walking paths. However, you may need to add some extra inches to your measurements to accommodate the possibility of more movement among the decorative rocks. For a driveway, you’ll want to achieve a depth of around four inches. You can use the size of the decorative rocks you choose to calculate how many layers you’ll need to reach this depth.

Assess the Height of Any Dividers

Landscaping walls and dividers help you create a visual distinction between areas such as walking paths and natural grass. Dividers can also keep decorative rocks in their place, but they won’t be of much use if the river rocks flow over them. You’ll also want to avoid having the decorative rocks piled so low that the dividers stick up too far from the ground and create a tripping hazard. As you think about depth, measure the height of any dividers you have in the landscaping design so you can purchase enough decorative rocks to meet the top rim.

Consider the Location & Size of the Decorative Rock

Smaller beach pebbles are often the go-to choice for walking paths, but they can slide around more than heavier decorative rocks. If your landscaping rocks are going to be on a slope or area where they may fall down, you’ll want to plan for the amount of height to keep the ground from showing. You’ll also want to carefully calculate how many inches you use for the depth to make maintenance easier. Planning for around two to three inches of smaller beach pebbles on slopes makes it possible to easily move them back into place while avoiding a major pileup elsewhere on the lawn.

No matter what type of landscaping project you’re planning, you can enhance its character and beauty with decorative rocks in a variety of sizes and colors, from pure gold pebbles to polished black river rock. For expert advice on designing your landscape with decorative rocks, reach out to the experts at RS&P Rocks Stones & Pebbles, a premier landscape rock and supply superstore. We specialize in drought-tolerant landscaping materials, including a variety of Mexican beach pebble and river rock. To learn how we can help you create the landscape of your dreams, call us today at (866) 380-0580.

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