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Yeah thats right no expansion joints needed on a slab that size. The steel mess will stop it from cracking. Cheers Chippo

Gday Pat82 100mm slab should be plenty thick just make sure you use steel mesh to prevent the slab from cracking. The mesh should sit in the middle of the slab, so 50mm from the top and bottom, You can do this using mesh chairs( little plastic chairs you sit the steel mesh on to keep it 50mm...