^ THIS.
Do not pour a pad without. Whomever built the garage in the place I currently have did not and there is always moisture coming up through the floor. Every tub or matt stored on the floor will be damp underneath, in spring it pops up all over the place. I want to epoxy my floor but I won't bother as it is just going to cause other issues.
I've poured basement floors and pads before and always use it, it's not that hard and if it's causing your contractor issues maybe he doesn't really know what he's doing in the first place. My last garage build had heated floors so I use barrier and insulation. God I miss that garage.
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