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?
It's fine. It was a similar situation with our stairs. Flexible adhesives can be applied up to 30mm depending on the type. That should be enough.