Can I Pave Over Mud For My Patio, As A Foundation For A Shed Or To Park My Car On?
People often wonder if they can miss out the fuss of digging up their garden/driveway, putting down substrate and jump straight to putting down paving slabs.
Well, it depends on how good you want the job to be.
If you’re going to put something on the paving, such as a shed or a parked car, it’s not a great idea to put the paving slabs on mud because they’ll subside giving an uneven base for a shed (which will warp) or the car which will be parked on uneven ground and could crack the paving when the ground freezes. If you’re only paving for decorative purposes, and only want to walk on the stones, the importance of a substrate is less. However, you still don’t want a large area, like a patio, to start shifting around and become uneven, which it will quickly do if laid onto mud.
So, the answer is, in all cases except laying individual, well-spaced paving slabs, it’s a good idea to lay a strong foundation for the paving to prevent them subsiding and ruining the job they were used for… to create a flat surface.