lifting tiles - Why?

[trevean]

Morning,
Can someone tell by looking at these images why the tiles have loosened. Laid on floorboards with 12mm Hardie screwed down on a bed of cement based adhesive. I'm confident floor itself is sound. Tiles are 300 x 500mm ceramic wall/floor and laid using slow set adhesive. It seemed to take ages for adhesive to go off - well over 24 hrs. Remaining tiles seem ok no hollow sound. But I think they would be easy to lift.

 

[Andy Allen]

What adhesive did you use ??

 

[trevean]

I'm reluctant to name yet but I do wonder about the adhesive but equally want to know if I have not laid these correctly.

 

[trevean]

slow set flexible.

 

[Martyn Leeds]

Adhesive skinned-over, and not back-buttered
?

 

[Andy Allen]

Adhesive mixed incorrectly, not enough water, no back buttering, adhesive not flexible enough, to much bounce on the floor due to incorrect prep...

Fact is tiling onto a wooden substrate is a minefield, unless you get everything spot on chances are it will fail.

Unless you give us the full information we can't say for sure what your issues are but I suspect there could be more that one. !

 

[Flintstone]

Adhesive not wet enough and or left to skin over.

 

[One Day]

No back-skimming to fill those waffles either.
Possible dusty backsides on the tiles?

I'd guess - too stiff a mix, possibly skinned over before no real effort to achieve a solid bed. Those tiles should be back skimmed and given a twist/push/pull.

 

[Chalker]

Cheap,adhesive with very little polymer.

 

[Ajax123]

Readybrek used instead of adhesive?