Screed to chipboard sub floor

[Muff Tiler]

Hi guys,

Been to look at a job where 2 floors (Chipboard & concrete screed meet) a couple of the tiles that are laid at the moment have come loose so there must be movement in the chipboard extention, was thinking over boarding the whole floor with cement board making sure to over lap where the 2 floor meet. Do you guys think this would be substantial? Welcome to any suggestions..
Thanks in advance

 

[Andy Allen]

I would prep the chipboard so it is suitable to tile on.
Then install a movement joint where the 2 floors meet...

 

[Dumbo]

Over board the chipboard latex the screed to match height and then as @Andy Allen movement joint on join

 

[Muff Tiler]

Thanks for the reply chaps! I'll do that!