New zincalum/colorbond shed on existing concretted area

Hi guys

I have a large concreted area.. and was thinking of putting a shed up somewhere (not sure yet) it will be under the 10sqm mark (or even a 4.5x2.25 shed is 10.1sqm i think but shhhhhh) .. anyway .. i know i can bolt it straight down to the concrete but i hear a lot of talk about "rebates" when putting down slabs .. so what do i need to do ontop of my existing concreted area to put the shed down? or what are some good suggestions to stop water perhaps seeping under in the shed when it rains for example? should i raise it up somehow? cut a trench around it?

Thanks!


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