Before pouring the slab we put down 2 inch ridged insolation below the slab and on the outside of the footings, we also lined the forms with 1 inch ridged insolation to stop thermal bridging through the slab and up into the house.
This indention into the slab is in the master bathroom enabling us to put in a flush walk in shower.
Just minutes before torrential down pour and then large amounts of snow the slabs control joints are cut and then the slab is covered with insulated concrete blankets to help with proper curing. 
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