I have replaced an old concrete floor using a builder as at my age I couldn't face all the physical work. The floor is about 13m square and was a thin layer of concrete over what looked like old lime mortar on top of rubble. This was dug out and the new floor has a DPM, about 4" of concrete, and a top screed of over 2".
The builder started to lay ceramic tiles, but it is clear that the screed is not level enough. There are high spots and a dip which is about 15mm deep. The screed also seems very crumbly, and you can scrape grooves in it with a finger nail.
I feel that the tiles should be taken up, and the floor re-leveled. Can anyone give me some quick advice before the builder arrives tomorrow morning?
Just how strong should a screed be? Should they be this crumbly?
If the floor is leveled with self-leveling compound will it (and the crumbly screed) be strong enough for the tiles?
The builder started to lay ceramic tiles, but it is clear that the screed is not level enough. There are high spots and a dip which is about 15mm deep. The screed also seems very crumbly, and you can scrape grooves in it with a finger nail.
I feel that the tiles should be taken up, and the floor re-leveled. Can anyone give me some quick advice before the builder arrives tomorrow morning?
Just how strong should a screed be? Should they be this crumbly?
If the floor is leveled with self-leveling compound will it (and the crumbly screed) be strong enough for the tiles?