plastering coverage rates

house

Registered User
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55
Hi all,

Can anyone give an approx coverage rate of a 25kg bag of cement for plastering works in m2 for typical overall thickness of 20, (scud 3mm + scratch 9mm + finish 8mm) and approx tonnes of sand required per m2 for the same build up?
Thanks
 
A ton of sand does 40m2 approx. Amount of cement determined by the strength of mix.