For both bonded and unbonded levelling screeds, the contractor should determine and use appropriate constituent material proportions and methods of working in order to fulfil the necessary requirements of 6.7 for in situ crushing resistance. A screed with nominal constituent material proportions by weight of cement to sand of 1:4 with a lower limit 1:3 and an upper limit of 1:4.5 would normally be expected to meet the criteria for in situ crushing resistance. Similarly, a screed of compressive strength class C20 or C25 would normally be expected to meet the criteria for in situ crushing resistance.

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