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How to lay tiles on rubble on a terrace?

 This will be a terrace facing a corner (southwest terrace) of about 90 square meters. The description of the house (construction work) includes a gravel backfill that ends about 20 cm below the finished terrace height, which gives me an opportunity to install crushed stone or something similar. I would like to lay 90 x 90 tiles 2 cm thick.

Is this possible on gravel and do I need so-called spacers or hub bearings?

• floor
• terrace
• tile on gravel