Terrace ceramic tiles in gravel - Any experience?

But you can't hear any other opinion, can you? I spoke with a master tiler at Raab Karcher, he said gluing would be the last option, gravel wouldn't be a problem at all,

well, I have the experience right here at my door. I have already lifted and re-laid them once. And that's why I put the slab on supports and no longer used joint sand.

In the past, the slabs were always laid in gravel, I don't know why everyone wants to glue them now.

Because the slabs used to be 5cm or more. 2cm is a modern thing. In the past, they were concrete slabs (which are still quite common today and also usually NOT glued at all).

Ok I can tell you quite precisely how it is with the 2cm ceramic slabs on the gravel:

We explicitly wanted 2cm ceramic slabs selected by us to be laid as a terrace because of the appearance.

- Buyer says in gravel no problem.
- Gardeners all say: never on gravel – only on concrete.
- Gardener we trust told him to offer us the slab on concrete – he says he does it on gravel because due to the size and weight 60×120 gravel is unproblematic. Only smaller slabs are bad.

- Now they are lying there, on the gravel, and after three months of little use the first ones already wobble when walking over them, not bad but still not nice....
GD