Tling over old tile adhesive

[rich hand]

I have removed tiles from ply and obviously old adhesive is left behind on the ply. How much prep does this surface need before re tiling? Will the new tiles adhere properly if old adhesive is left behind?

 

[Ian]

Is it a wall or floor? And how thick is the ply?

 

[The D]

why have the tiles been removed ??

 

[rich hand]

the grout cracked. I'm getting the feeling that old adhesive can be tiled over.

 

[The D]

Why did the grout crack ????

 

[Andy Allen]

why don't you just remove the ply, and replace it with something more suitable..?

 

[Qwerty]

why don't you just remove the ply, and replace it with something more suitable..?

My thoughts precisely. The ply is likely to be your problem!

 

[Mr Tiler]

this should be in d.i.y lol

 

[rich hand]

the ply can not be removed. The wrong adhesive was used originally. The job simply means applying the correct adhesive. Although I am a flooring professional, I am not a tiler so wondering how important it is to remove remains of old adhesive. I know what the theory may say but I am wanting practical experience on this matter.

 

[The D]

What adhesive was used