For most purposes, about 2 inches of material will be adequate. If you’re using materials that are themselves larger than 2 inches, then the depth will probably be the size of the rocks, that is, you’ll just want one layer of 3-8 inch rocks.
Cut a 4-inch-wide, 4-inch-deep trench between the rocks and the grass, using a half-moon edging tool or a spade. Leave the trench bare and recut the edging line as needed to provide space between the rocks and the grass, preventing the grass from spilling over into the rocks.
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Frequently Asked Questions
How deep should rock landscaping be?
The suggested depth of coverage varies according to the size of the individual stones. If the stone size is 1/2-inch or less, the suggested depth is 2-inches. Stones that are 3/4-inch to 1-inch should have a depth of about 3-inches. Stones that are 1-inch or larger should have a depth of 4-inches.
How deep should rocks be to prevent weeds?
Like organic mulch, a 2-3” layer of stone is required to prevent weeds. Stone eventually works its way into landscape soil and is very difficult to remove when a landscape remodel is in order. Dust and dirt also settle between rocks that ultimately allow weed seeds to germinate.
What is a good depth for gravel?
Commonly, the recommended gravel depth for driveway construction, is around 150mm-200mm. This consists of the membrane sheet on the subsoil, a layer of sub-base made from MOT type 1 aggregate compacted to between 100mm and 150mm, and then the top layer of gravel.
What's the minimum depth to lay a stone?
The bigger the stone, the deeper the minimum depth. If you have big stones (don't go there) there will be big gaps between them when you lay them 1 stone deep . That means that you'll need at least a second layer of stones to cover the gaps.