I recently tore out a couple of built-in wardrobes in the hall of our house built in '62 to put in sliding doors and interior. Didn't really think they had laid marble under the wardrobes but also couldn't believe they left a big hole down to the slab.
It seems they first cast a slab and then built up the floor on top with cement or leveling compound. Now I want to lay similar marble as the rest of the floor into the niche and wonder how I should arrange the substrate.
My thesis is to use leveling compound or fill with cement up to 13 mm below the current level since the marble tiles are 10 mm thick and I assume the adhesive is 3 mm. Is there anything else I need to do - prime the substrate or such? Or is there a better method?
I haven't worked much with leveling compound, but I assume I should apply it in several layers if I'm going up to 10 cm, as is the plan in this case? No problem since it will probably take some time to get the tiles delivered.
Self-leveling compound is expensive, so cast with concrete and only use self-leveling compound on the top if you don't think you can make the concrete level on the small surface.
10 cm? In that case, I would have laid a layer or two of bricks or other cheap stone material and then floated on top. It can ideally flow in and between.
Old thread, noticed that I didn't reply. In the end, I did as @Thomas_Blekinge suggested; filled up with paving stones and levelling compound around it. Figured that floor wouldn't be loaded anyway. Let it dry for a couple of weeks.
It turned out well in the end, even and smooth surface, and it hasn't settled yet...
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