Relaying used floor tiles

[jcp]

I have to relay ceramic tiles (330mmx330mm) in a hall to correct a slight fall (15-20mm) in floor level across the room. Don't ask why, just accept I have to do it! I have removed about 20 tiles, soaked them in a water bath for a few days, and then cleaned off about 4mm of tile cement from about 8 of them - but it is very tedious and time consuming. Given that I need to raise the remaining tiles up when I relay them, is there any reason why I cannot just leave the old cement on? Presumably new tile cement sticks to old tile cement. It would save me from either using a thick bed of new tile cement, or else laying a preliminary layer of floor levelling cement.

Has anyone got any ideas?

 

[chivers67]

Hi, I can't see much of an issue myself but i'm not pro tiler. I'd try to score some parts so it will bond better to the new adhesive. I'd use a multi tool with a grout removing blade with care or a small angle grinder outside.

 

[jcp]

Thanks - I’ll go for that!

My local Tile dealer wants me to clean them right back - but it takes ages.

I’ve had to do other things for a while, but will be back on the tiling soon.