New screed down - trying to figure tiling out approach!

[Italy]

mapei eco primer grip,
not appropriate, it is used to lay other tiles on top of the tiles.
you need a mapei primer like primer g or similar

 

[Pauly tiler]

Hi, If it was a flow screed the laitance should have and or will still have to be mechanically removed. To my knowledge there is no such thing as laitance free flow screeds, just reduced laitance. I would then use a suitable primer for flow screeds, (Gyvlon – Truflow – High Flow – Cem Flo, are just a few) they are variations on a theme really. You need to prime them well as they all react badly to water/damp. As you are rightly using a stress membrane I would use a quality adhesive like Ardex AF200 plus to install the matting to the primed screed. After that you can pretty much treat it as a standard heated screed floor to be tiled, don't skimp on adhesive, C2 S1 grade at a minimum.
Please please please cycle the floor up and down with the UFH to stabilise it and remove any remaining moisture before you install the membrane, as I say, these floors react badly with moisture especially when its trapped below the stress membrane.
You can find details of the cycle procedure online.
I hope it helps.
Pauly

 

[hmtiling]

Hi, If it was a flow screed the laitance should have and or will still have to be mechanically removed. To my knowledge there is no such thing as laitance free flow screeds, just reduced laitance. I would then use a suitable primer for flow screeds, (Gyvlon – Truflow – High Flow – Cem Flo, are just a few) they are variations on a theme really. You need to prime them well as they all react badly to water/damp. As you are rightly using a stress membrane I would use a quality adhesive like Ardex AF200 plus to install the matting to the primed screed. After that you can pretty much treat it as a standard heated screed floor to be tiled, don't skimp on adhesive, C2 S1 grade at a minimum.
Please please please cycle the floor up and down with the UFH to stabilise it and remove any remaining moisture before you install the membrane, as I say, these floors react badly with moisture especially when its trapped below the stress membrane.
You can find details of the cycle procedure online.
I hope it helps.
Pauly

If using ditra or durabase s1 would be the maximum not minimum

 

[Pauly tiler]

Noted HMT, it was the C2 I was referring to, should have left the S1 out of the line.

Cheers

 

[LM]

Cheers Lee Mac. When you say 'honour the joint' can you tell me what you mean by this? I think I have a clue but just want to check! Thanks.

The joint between the two areas of floor must be continued upwards right through the membrane and tiles. Ideally but not critically you will able to set the tiles out so as a full tile falls on this joint and then instead of grouting this joint fill it instead with a colour matched Silicon from the same brand as your grout.

 

[GrayD]

Have you paid them .

Not the whole balance, just 75%.

 

[Ajax123]

Its cement based screed. Still needs sanding and moisture testing. UFH needs to be commissioned and run and screed needs priming etc etc

 

[Ajax123]

Its cement based screed. Still needs sanding and moisture testing. UFH needs to be commissioned and run and screed needs priming etc etc

 

[widler]

It looks like cement based to me as well, colour looks wrong for analshite .
One word though , flexbone 🙂

 

[hmtiling]

I've seen my first 2 anhydrite screeds ober the last 2 weeks. They are awful! Loads of laitence and all over the place for level. They're completely different to the alpha hemi ones which I normally get. The anhydrite are a cheaper island company. Get what you pay for as always