Sand for cement sand levelling screeds should conform to BS EN 13139.
The preferred grading would be a 0/4 sand with a fines category 1 within the range MP, and ideally have a grading between 20% to 66% passing the 0.5 sieve.
Where the screed is to be placed by pumping, a further restriction on the proportion passing a 0.250 mm sieve should be used.
Other sands may be used provided there is satisfactory data on the properties of similar levelling screeds made with them, e.g. bonded, unbonded or floating.
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