Is this spot bonding and if not will it be an issue? - Tile Advice

[Willc23]

Hello,

I'm a member of the public and would really appreciate your opinion on a tiling job that is being done right now.

My landscaper is tiling my patio with large ceramic tiles 75x75cm. I got home and noticed that the tiles sound very hollow when knocked. On looking at CCTV I noticed that he hasn't put adhesive under the whole tile, but only around the edge and then a H shape in the middle. Is this acceptable and will it cause issues? The hollow sound already doesn't sound good. Should I ask him to relay with more adhesive is that even possible?

Thanks for any replies on advance.

 

[Willc23]

Some photos of how he is putting down the adhesive.

 

[Ajax123]

It'll cause issues. Not spot fixing as such but still wrong

 

[Willc23]

Thanks for the reply. What type of issue could it cause?

 

[Ajax123]

Excessive flex, cracking, popping, vulnerabilty to puncture due to point loading, dampness etc etc.

 

[Dav3yboi]

Need to get at least 98% coverage of the tile with adhesive and also back butter the tile unless using a pourable adhesive

I would definitely pull him up on this