I need to lay a concrete slab so that the 12ft trampoline in the garden is level. HOwever this is my first attempt at anything like this.
At the moment it is just sitting on soil butI can see this sinking in the wet weather so want to lay a concrete base for this but am unsure if concrete can just be poured on top of soil and how deep it would need to be.
Also if it would need to be a certian type of mix.
Any advise would be greatly appreciated.