Hi folks.

I have some existing ceramic tiles on my tiny bathroom floor, and I wish to tile over them with new tiles. I realise the usual advice is to pull them up and start afresh, but I want to lay over the existing so the height of the new tiles will be perfectly level with the adjoining hallway, which has had a wooden floor laid down. The floor underneath the existing tiles is concrete.
New tiles are 450 x 450 and I have brought a flexible powdered adhesive.


A few questions:

1) How should I prep the existing tiles. Do I need some kind of sealant or will just a wash-down suffice ?

2) There were no tiles installed where an old shower tray was, so I need to use some kind of levelling compound to raise the floor in this area - its approx 10mm.

Can anyone recommend the best product for this situation? (Hopefully something that dries quick as I would like to tile the floor as soon as poss)

Thanks Guys!

So long as old tiles are nice and secure then simply wash down with sugar soap to degrease. I also score the tiles for added key.

The other guys will recommend a suitable SLC to raise the area of the shower but you could use a cement board.

Agree with Macten. If you have any spare old tiles, then lay these in the shower area and tile over these.

Otherwise, cement board or a levelling compound.

Alternately, you could rip the lot up and then lay cement board (10mm) over the whole area.

All good advice above, if you decide to tile over score surface as said. Maybe a slurry bond to help key