This Post explains about the floor screed as per standards
BS 8204 & EN 13813 (DIN 18560):
These standards will not guide you how the
screed shall be in terms of properties…. You need to decide what shall be the
parameters depending on your requirement.
How the screeds are classified, the parameters of the
screeds, how to test the screed materials. How to test the installed screed,
there rectifications.
For tiling works, refer AS 3958.1 - surface tolerance.