Shed/Workshop slab touching colorbond or no?

Hello all,



I am installing a new 5*6m shed and getting the slab poured on wednesday. the shed is already built and the slab is the last step. I have heard a few differing opinonis and I was wondering if we should pour up against the colorbond or leave a a gap between the wall and concrete or put some barrier in (plastic stripping or something similar) before the pour.



Any thoughts??





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