Gravel Calculator Easily Calculate How Much Gravel You Need
12 11 2022 · You would usually lay a 10mm aggregate at a depth of 30 40mm but on a driveway this would need to be at least 50mm A 20mm aggregate would need to be at least 40 50mm deep and at least 50 60mm on driveways A larger aggregate will settle and bond together better than smaller ones The depth you will need to select for your gravel or slate