Tile ontop of tile?

[Tile kid]

So, I have been asked to tile a pub floor roughly 40m2, the guy wants me to go over the existing tiles so it doesn't create more work, I have advised him that they should be took up as there is a lot of flex and bounce in the floor as it is, but he wants to take the risk.

Is there anything I can do to make the floor less likley to fail slc, uncoupling mat etc?

 

[J Sid]

Is there any sign of the tiles failing now with the bounce and flex, loose tiles cracks?

 

[Tile kid]

Is there any sign of the tiles failing now with the bounce and flex, loose tiles cracks?

No all the tiles seem to be stuck down well

 

[hmtiling]

Blanke permat will help massively with the deflection (bounce). It is not a cheap product though