We have an old detached garage of a simpler design, measuring 20 sqm, with a cracked concrete floor that has sunk over the years (it has been stable for many years now). I would like to level it somehow.

The floor slants quite a bit, at the garage door I can raise it by a maximum of 4 cm while I need 15 cm of concrete where it is at its lowest.

Is it possible to lay out a thinner reinforcement mesh and order a concrete truck to pump in concrete or will it just crack? Is 4 cm too thin? What do you think about SKB concrete?
 
Don't know, but maybe you can drill down iron into the old slab, then lay either mesh or just iron welded into the drilled holes.

Maybe chip up cracks in a V shape and dowel in there as well.

4cm is probably on the small side.
 
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