Patio & Paving
You will need to excavate a Minimum of 150mm This is the minimum make up
You will need to build a frame for in the excavated area to stop the sides from caving in.
The ground underneath needs to be weed free and it is recommended you prepare the ground ( soil) by making it as flat as possible.
Use a rake to level out any imperfections and place the frame in the excavated area checking it is level.
It is recommended you allow for a minimum of 100mm of hardcore for the base (type1)
On top of the Hardcore it is recommended a minimum50mm of bedding sand (Sharp Sand) to lay your paving slabs/bricks on.