Anhydrite screed with UFH - Help please

[DHTiling]

I would have used Keraquick rather than Mapeker

Why..?

 

[Ajax123]

easier to spell????

serio0usly though I am not certain that the choice of adhesive is much at issue here. I think it is thermal shock that has popped the tiles. 2 days is too soon IMO

 

[TrumpersUnited]

Why..?

I've just done a 88 sq metre job on a heated gyvlon screed with a 60 x 60 porcelain floor tile and Mapei recommended Keraquick because it is more flexible than Mapeker. I'd rather go with what the manufacturer recommends for peace of mind.

 

[jay]

hi any pictures might help and did you allow for movement joint around the perimeter of tiles:welcome:

 

[DHTiling]

I've just done a 88 sq metre job on a heated gyvlon screed with a 60 x 60 porcelain floor tile and Mapei recommended Keraquick because it is more flexible than Mapeker. I'd rather go with what the manufacturer recommends for peace of mind.

Mapeker is suitable for timber overlay of 15mm and above.. So is flexible enough to cope with that UFH but i agree that keraquick is more flexible and nothing wrong with overkill.

Just wondered why..

 

[nybor62]

Hi,

I am after some advice on my recent project of self build house.

I have recently tiled my kitchen floor which was a anhydrite screed with wet type UFH fitted. The floor has been down for over 12 months or more now and fully dried out.

I have used the following for my floor after seeking advice and using Mapei technical.

10mm Porcelain tiles
Mapei Primer G to prime the floor firstly
Mapei Mapeker adhesive using 10mm half moon trowel applied to the floor only and not to tile back. All tiles were twisted when appling to ensure good bond. This was mixed with water and not Mapei latex plus.
Mapei Grout

The floor has been down for a couple of weeks now and UFH system on.
I have noticed the odd couple of very small cracks in the grout and after tapping tiles near these cracks I can hear that part of the tile is not bonded either to the floor or the adhesive.

I had hoped I had covered all bases with this and the floor looks great. However I fear that the problem could get worse and any advise would be helpful.

i would have mixed adhesive with latex plus + what did you mix grout with . was it water or did you use mapei fugolastic two mix the grout . the heating should be left off for a few weeks , and turn it up gradually

 

[Ajax123]

Why not simply use Gypsum based adhesive..........

 

[DHTiling]

Why not simply use Gypsum based adhesive..........

Even that would not cope with thermal shock..

This member has gone quiet..???

 

[Ajax123]

Even that would not cope with thermal shock..

This member has gone quiet..???

No I agree Dave. it would not. It would save me loads and loads of hassle though....

 

[DHTiling]

No I agree Dave. it would not. It would save me loads and loads of hassle though....

Keeps you busy..LOL..

 

[Ajax123]

Keeps you busy..LOL..

pays the bills I spose...

 

[doug boardley]

are gypsum based adhesives readily available at your local stockists?

 

[Sean Page]

pays the bills I spose...

.... and keeps us from getting bored :lol::lol:

 

[Ajax123]

are gypsum based adhesives readily available at your local stockists?

Not often unfortuntely Doug.

Creative Impressions tend to deal direct rather than through distributors.

Mapei, PCI, Forbo all have them in Europe but not over here......There are even gypsum based tile adhesives in Cyprus and Isreal but hardly any over here......:mad2:

Maybe if there was more demand from the tiling fraternity towards the likes of Mapei and BAL etc etc this would change. Mapei have said tome they have one but don't get asked for it so don't bring it into the country.

As long as we keep using cement on anhydrite we will keep having issues with chemical delamination IMO (even if in this case I don't think it is the culprit)

 

[Richard Edwards]

Hi - Interesting Ajax - I've read a lot of your posts and helpful advise ref PvA, Anhydrite Screeds etc and found them informative.

So - lets say - I've got an anhydrite screeded floor to over-lay with Porcelain tiles or natural stone with UFH next week. [Which I have not by the way] Where do I get Gypsum based flexible floor adhesive from please?

Thank you in advance

Richard