How to handle natural stone slabs for a terrace?

How big is the terrace? 14k is quite significant despite the travertine.

We made the pool ourselves, it just needed to be framed.

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WOW, he only wants to replace 2 - 3 tiles, for the rest...that just happens, we should have laid it in concrete. And he believes that the quartz sand is useless now anyway because I grouted the tiles. However, I am of the opinion that the tiles were laid so close together that the quartz sand doesn’t fall through at all.

What do you do now when the service provider partially blocks?

Despite everything… very beautiful stone..

Our garden and landscaping contractor said that the fine gravel wedges into the joints, reduces rocking, and only then provides stability to the surface.
And sweep nicely afterwards, about 3-5 times, at 4-week intervals

We just had our slabs laid tightly without joints. We are still very satisfied with that after years.