What is the mixing ratio of screed?

If you make screed to use with the StaenisGrid DIY system, you use a mixing ratio of 5 parts coarse river sand (grain 0/4-0/7) to 1 part cement. After mixing, add water until you get an earth-moist mixture.

Climate-neutral floor structure
FIT - Flanders - State of the Art Agentschap Innoveren & Ondernemen Vlaanderen Circulair  content= Made In Belgium EIT Climate-KIC Netwerk Ondernemen PMV