Failed Adhesive?

[DTHulse]

Hi all, first post is a real problem. Concrete floor primed OK, self levelling compound used, heating wires laid and covered with more of same self levelling compound, left to dry for 4 days and then quartz tiles laid with flexible adhesive / cement. Used top quality products all suitable for undefloor heating and yet the tiles are lifting with all the cement stuck to the tile and almost none to levelling compound below it. Room was dry and no dust and followed instructions so anyone any ideas as to what has gone wrong? Did I miss something? Anyone know anyone who can do technical investigations to find out what happened?

 

[Del W]

Welcome to TF. Was the UFH on while tiling was done.

 

[DHTiling]

Hi and welcome..

Which quartz tiles are they.?

Also are they suitable for use with UFH.?

 

[Andy Allen]

dont think your supposed to use quartz tiles with ufh...

 

[mattle40]

What brand was the levelling compound? And is this still sound and solid?

 

[Andy Allen]

allso what primer did you use?

 

[kilty55]

adhesive type also please?

 

[John Benton]

Not sure if these tiles are compatible with UFH, never fitted them with it. I would imagine that the heat may have some effect on the resin content (up to 95% in some). You will probably have to speak to tile supplier IMO.

 

[DTHulse]

Welcome to TF. Was the UFH on while tiling was done.

Hi, no the UFH was not one and not used for over a week after the tiles had been laid

 

[Time's Ran Out]

The answer may be in the other 2 replies!

 

[DTHulse]

Hi, I know tnat some are not though but have manufacturers guarantee they are OK with UFH. Can't see a problem with the tiles as the adhesive is stuck solid to them but not to the levelling compound below. It seems like a failed between the levelling compound (which is all intact) and the adhesive. And ideas why the two layers would part company so completely?

 

[DTHulse]

Hi, adhesive was Ultra SB Rapid Set Flexible.

 

[DTHulse]

Hi, primer? No, didn't use any primer on the levelling compound that covered the electrical trace / heating wires. Should I have done?

 

[DHTiling]

Using the UFH to early could have shocked the adhesive breaking the bond.

Maybe some pics , so we can see what you do. ?

 

[Rookery]

Gulfstone state that the adhesive used to fix their stone should be 2 part latex based though I dont know if your use of water in the mix caused this problem. Maybe the slc covering was dusty when you fixed the tiles, maybe the ufh was switched on too soon and too high initially.