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Aggregate Depth Laying Guide
On each decorative aggregates, slate chippings and some pebbles product pages, there is a recommendation in the tabs section as to how deep you should lay the aggregate. A visual example of the currently selected product is displayed. The larger the aggregate the deeper it should be laid. This page allows you to visualise all the recommended depths for gravel, slate chippings and pebbles, to help you with your purchasing decision. You don't want to lay the aggregate too thinly because it will look patchy and expose any weed membrane fabric you might have laid. The Volume Calculator will help you estimate how much gravel you will need.
Gravel Depth Laying Guide
The 6mm gravel is usually used in alpine gardens and rockeries, and can be laid at between 20-30mm. The 10mm and 14mm is normally used for decorative purposes and on paths and is best laid at between 30-40mm. The 20mm is normally used on driveways and also for decorative landscaping projects. It is best laid at between 40-50mm. You should also treat 16mm gravel the same as the 10mm and 14mm decorative aggregates when it comes to the laying depth. You can see 4 different grading sizes of gravel that alternate between what we estimate the minimum and maximum depth should be.
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6mm Gravel at Depths of 20mm and 30mm
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10mm Gravel at Depths of 30mm and 40mm
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14mm Gravel at Depths of 30mm and 40mm
Note: Also applies to 16mm aggregates.
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20mm Gravel at Depths of 40mm and 50mm
Slate Chippings Depth Laying Guide
The 20mm and 40mm slate chippings aggregate are ideal for paths and driveways. Slate is also used as a mulch to suppress weeds and hold moisture in the soil. You can see the 2 grading sizes of slate chippings that alternate between what we estimate the minimum and maximum depth should be.
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20mm Slate Chippings at Depths of 30mm and 40mm
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40mm Slate Chippings at Depths of 40mm and 50mm
Pebbles Depth Laying Guide
Pebbles at between 20mm and 40mm need to be laid at 50mm, 60mm or even more to get a decent coverage. They are usually used in decorative landscaping projects and not for areas that would be walked on. The larger sizes of pebbles above 50mm and the cobbles would be used in water features or ponds and probably don't need to be laid to cover the base area.
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20-30mm Pebbles at Depths of 50mm and 60mm
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20-40mm Pebbles at Depths of 50mm and 60mm
