What sort of base would i put on an outside cupboard??

i need to build a cupboard for outside that will be exposed to the elements that will house a washing machine and dryer. it will be on top of a row of bessa blocks to raise it up to prevent it getting flooded. what sort of base to this cupboard would i put on top of the bessa blocks?? needs to be something that wont be affected by water and strong enough to take a washing machine with 4 feet. the base of the cupboard will measure 1470mm x 650mm.


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