how much gravel do i need for my driveway
The depth you will need for the gravel or aggregates will depend on what size you use and what it is used for. Generally you would lay a 10mm aggregate at 3-4cm (approx 1.5) deep, but on a drive you would go to 5cm (approx 2). A 20mm aggregate would need to be 4-5cm deep (approx 2) and a little deeper on drives.