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Can granite tiles be laid directly on a concrete floor without levelling compound?

I would like to equip my conditioned basement (about 20 m²) with granite tiles (30.5 x 30.5 x 1).

The floor slab = concrete floor is relatively level. Max. unevenness 5 mm.

Can I glue the tiles directly onto the concrete with an elastic adhesive? Or do I have to necessarily work with a leveling compound. I'm intimidated by the cost of levelling compounds if it's not absolutely necessary.

What do the experts say?

• tiles