Hello everyone

I am after some helpful information on how i can build an external small room.

I have a house built in 1956 and it has an external door for access into a room, i would like to turn this into a walk in robe for my daughter. Outside it has a concrete slab/deck and a concrete verandah, my questions are, what do i need to place under my frame to stop water coming in if the rain comes in sideways?
Is blue board ok to use?

Any help would be much appreciated.


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