brazilian nightmare

[Spud]

BOTACT flexible , and PANABOND C 13 , were the 2 adhesives used , the floor was primed and dust free ..the back of the slate was not particularly dusty . What ye wont believe is that the slates corners have curled upwards slightly . The bed was trowled to 12mm and the tile pasted evenly.It seemes as if the slate has reacted to the adhesive and curled upwards . both adhesives have never let me down before and have stuck solid to the screed.

I have seen this happen with green marble and am under the impression it happens with stones with a high copper content, i think you may have to seal the backs of the stone before fitting or use a non cement based adhesive

 

[john c]

Thanks Galaxy ,makes sense,was considering priming tiles ,Still nervous ,underfloor heating .. very big but very thin 10mm .Iem not aware of any non cement based floor adhesives , i must enquire.

 

[Houston]

was it anhydrite screed

 

[Diamond Pool Finishers]

yes as above!!??

 

[faithhealer]

John C says its stuck to the screed