Filling foundation stone joint - Which material is recommended?

Hello everyone,

I have laid the following paving stones as base stones (see attachments). Now I wanted to inquire what would be best to use to fill the joints?

Thanks for the suggestions

Regards
Jörg

Dan Sand No Grow. Fill joints, lightly water, wait. Becomes hard as stone.

Hello,

I have looked at the product. But I wonder how it is supposed to hold in the joints? The stones are 10 cm high and the sand would fall out again before it hardens.

Did I misunderstand something or is there something else/better for this application?

Why should they trickle out? Are they supposed to stand next to each other like grenadiers, without being embedded in a pavement? It looks like that here.

Partly/partly in some places there will of course still be plaster, but not immediately. At those spots the lawn then connects, it is basically intended as a single line for sealing the base.

Then she arranged it with screed concrete.