Help please, tiles cracked/moving

[Bathfix Bob]

Builder went for speed and not quality by not back buttering, tut tut..anyone can spread addy and plonk tiles down but he needs to back butter and collapse ridges.
He will now pay dearly, an expensive lesson ...

 

[H573]

So on flooring, should you always back butter?

 

[Dumbo]

No , but tiles above a certain size should be and 600 x 600 should be
.

 

[J Sid]

I think it's good practice to back butter all tiles

 

[H573]

Cheers, much appreciated

 

[Andy Allen]

I think it's good practice to back butter all tiles

Even mosaics....? 🙂

 

[Steve doc]

There has to be more to it than just the tiles not being buttered I think as it looks like every tile has failed ,I haven't seen anything like this since porcelain first come out and some didn't use a flexible adhesive hence the non porous tiles not sticking to the adhesive . I would of thought a decent bal adhesive would of still gripped better than the picture shows.

 

[J Sid]

how much coverage can see ? 100% ? 75% 50% less?, no back butter, and skining over of trowled mix. Whatever suitable adhesive is used it will fail.

 

[Andy Allen]

Imo it's a combination of....

Sticking straight to ply...
Crap adhesive...
To much movement...( Especially with crap adhesive)..
No back buttering, with large format...

Either one or all of the above could of cause this problem....

I would now.....

Strengthen the floor to eliminate excessive movement...
Overboard with Hardie boards glued and screwed...
Tile using a decent flexible adhesive, like bal single part fastflex, or similar...
Back butter the tiles..
Grout with bal wide joint grout with gt1 admixture....or similar...

 

[Steve doc]

how much coverage can see ? 100% ? 75% 50% less?, no back butter, and skining over of trowled mix. Whatever suitable adhesive is used it will fail.

You can see the print of the tile in the adhesive obviously not complete coverage but I would of thought some of the tiles would of bonded it just looks to me as if the bond was broke possible walked on before completely set or adhesive skinned over .