Cemfloor for self levelling foundation slab

[BotusBuild]

We have about 130m2 of foundation slab that 1) needs to levelled and 2) needs to be raised by an average of 55mm.

The foundation slab already contains the UFH pipes so there would be no intermediate insulation layer - the screed can be poured directly on the slab as far as I am concerned.

I have read that Cemfloor can be used in this manner and the min thickness is 25mm for such a bonded application.

 

All the installers I have contacted want a membrane installed first and I have pushed back quoting from a document they sent me as part of their quotation packs. Their also asking for an edging strip to be installed as well, but this screed will sit up against the EPS of Nudura ICF, which surely itself will absorb any "movement".

 

Awaiting their response, but I would love to hear if anyone else has applied Cemfloor just as a levelling screed with no membrane between it and the foundation slab. 

[nod]

You can’t put it down directly onto a slab It will pull in to quickly And edging strip is needed for expansion and will take about 30 minutes to install 

[Mr Punter]

I have seen it marketed as a bonded screed, so I can't see an issue.  They may want the subfloor cleaned and primed.