Sand sharp sand would be the preferred material as this seems to be more stable. quantities are dependant upon existing ground works and levels. cement for our example 1 bag (25kg) of cement should be sufficient.. How to build a shed base advice on laying timber, plastic, paved and concrete bases a firm, level base should be the starting point for any shed or garden building.. To be honest, for a shed base, i wouldn't go to all that trouble. usually just the cheapest pavers (around
