What Depth Should Garden Gravel Be?

As a rule of thumb, you are going to need at least twice the depth of the chipping of gravel size. So, for 20mm chippings you are going to need at least 40mm depth to stop the base material showing through after time. Generally we would recommend going slightly deeper than this to ensure good coverage, but don’t go deeper than needed especially on small shingles / gravel such as 10mm which will be like walking on Brighton beach if used deeper than 40mm.