Screeding over solid concrete and block and beam

[Tommyt01]

Hi,
Currently half way through an extension and looking to put Ufh throughout the back of the house.
The extension is having to have a block and beam floor, due to clay and possible heave.
The existing part of the house has a solid concrete floor, which is going to be removed, and redone with same insulation as the block and beam floor.
Am I able to mesh across both substrates and screed both as one, with Ufh heating pipes tied to the mesh? Or is there a risk of possible movement between the two?

 

[phatboy]

Mesh may be unnecessary, we didnt do it. But fit the UFH pipe inside 25mm tube 150mm each side of the transition so it can move

 

[noseall]

Mesh may be unnecessary, we didnt do it. But fit the UFH pipe inside 25mm tube 150mm each side of the transition so it can move

That sounds like a right ball ache.