Does a vapour barrier need to be installed with standard insulation screed?
For the installation of standard insulation screed in the StaenisGrid, you may use a foil. Afterwards, it can be covered with OSB or Durelis tongue and groove boards.
For the installation of standard insulation screed as a leveling layer (without StaenisGrid), always install without foil.
You can improve the adhesion of the standard insulation screed by moistening the concrete substrate with water the evening before.