problems with 600x600

[newmantiling]

hi there fellow tilers i tiled the ground floor of a house with 600x600 polished porcelin tiles.the screed was sand cement with underfloor heating the floor was primed and tiled with nanolight white with no expanshion joints the job was done 3years ago .now for the problem.the tiles are starting to debond and come loose.the adesive has bonded to the floor but not the tile.l have been a tiler for 17 years so i have not done anything silly please help

 

[DHTiling]

Hello and welcome..

Some more info please..

Was the screed commissioned to the UFH before tiling ... and what is the largest linear run of tiling in mtrs..?

 

[hillhead]

Welcome along, more info please and it sounds like movement in the screed.

 

[Stewart]

Was there enough expansion around the perimeter.......?


Created on iPhone.....

 

[newmantiling]

largest area 7mx4m but total area about100m ufh was up and going

 

[jay]

How many metres are in the floor all up

woops to slow

 

[newmantiling]

i was told it was air pockets in bedding then heating up and blowing tiles off tiles where ok when job was done

 

[Time's Ran Out]

Solid bed fixed or dot fixed?
Is Nanolight a flexible adhesive?

 

[DHTiling]

Air pockets?

It should be solid bed.

Anyway, IMO it will be thermal stress. But without seeing bedding method etc it is hard to tell.

 

[newmantiling]

solid bed but some had to be bedded up yes it is supposed to be flex

 

[jay]

Have the tiles peaked or bowed up off the floor

 

[DHTiling]

solid bed but some had to be bedded up yes it is supposed to be flex

Did you dab then to bed up for unevenness ?

 

[newmantiling]

tiles seem to have blown off the adesive because inprint of tile in adesive

 

[newmantiling]

yes to bed tile up

 

[DHTiling]

Did you back skim the tiles. ?

After 3 years though it will deffo be stress related and either the installation could not cope with Tbe lateral stress or the bedding method eventually gave with the lateral stress.

 

[jay]

So the tiles have lifted away from adh

 

[DHTiling]

yes to bed tile up

The thing is though , if you exceeded the recommend thickness and also had hollow spots, then you lose tensile strength.

 

[newmantiling]

nano is supposed to do 20 mm

 

[newmantiling]

the problem i have is l do not have problems with any other adesives

 

[DHTiling]

I thought it was 15mm.

What size joints did you use, ?

Was the tiling to skirting or under. ?

Still yet to say jf you skimmed the tile backs to fill in the profile.

 

[DHTiling]

the problem i have is l do not have problems with any other adesives

And just to add , we have heard of probs with that brand, might be worth a tech cal out.

 

[bobbynz]

largest area 7mx4m but total area about100m ufh was up and going

:welcome:Are the majority of lifting tiles in the 7 x 4 area? if so then Daves right too much stress and not enough room to expand. Skimmed on the back of the tiles could of helped prevent it. But that large area really needs to have an expansion joint. Did you grout the perimeters or silicone?

 

[newmantiling]

3 mm joint under skirting flit backed tiles

 

[newmantiling]

movement under skirting

 

[jay]

May i ask why no other expansion joint