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I am trying to level our utility room floor. It is partially tiled the
rest being concrete. The largest variation in depth is approx 15mm. What
should I use to level this prior to tiling? Self-levelling compound says
no more than 3mm. Whatever is suggested can I use it over the tiles as
well as concrete to so using existing tiles to fill in some of the
depth?

TIA

Martin


You could use the tile adhesive itself to level the floor by the amount you say. If
you're tiling on to the concrete section the adhesive itself is the ideal choice.