Newbie looking for advice on tiles lifting!

[Dumbo]

I wouldn't put it over joint.

Yes . Expansion joint should continue from the screed up through the tiles uninterupted

 

[Andy Rhodes]

In the extension on the UFH & cement screed, I would have laid anti-fracture mat to were it meets the original floor, dependent on how wide that room was I may have put an expansion joint through the middle of the room if it 3m2 or more , but defo left 10 mm round the walls just to give me piece of mind in case of any movement. as for between the original floor & the extension was I would have used some kind of movement joint either mastic or a trim type,but again from looking a the pictures you supplied I don't think in would have made any difference

 

[Benc]

Tiles are all lifted and the floor is being sanded this week! Going to use a acrylic primer! Can anyone tell me the proper procedure for laying this primer please?

 

[Benc]

 

[Benc]

Floor ready for sanding! Part of the floor is very uneven and a self leveling compound has to be used to bring it up to the correct level! Also laying an anti fracture Matt plus an expansion joint between the two floors

 

[Flintstone]

That floor looks to have suffered some cracking, it needs an antifracture mat.
If a screed is pumped - it needs sanding, simple as that, I've never seen one that doesn't need sanding.
The reason for the failures are-
PVA
Fixing method
Not sanded.
The tiler needs a reality check, don't let him fob you off !
I'd be calling the screed company too and demanding an answer and a resolution as to why there pumped in self leveling screed is not level !

 

[Benc]

He won’t be fobbing anyone off this time!!

 

[Flintstone]

Are you letting him have another attempt ?