For a Patio, or sidewalk around the home, a 4" to 6" (10 to 15cm) depth is usually sufficient. This should be a sharp concrete sand, stone dust or limestone screeing.
For driveways a 6" to 10" (15 to 26cm) gravel base should be well compacted in layers of approximately 8" (20 cm) with a vibrating type compactor. This should consist of a good Grade 'A1 road gravel with particles upto 3/4" (2 cm).This should then be covered with 1" to 2" (2.5 cm to 5 cm) of sharp sand, stone dust or limestone screenings and screeded level but not compacted Remember there is no definite rule of depth. |