because the new slab over one thats still settling and will be
thin... will crack, and once that occurs you will have to remove both
slabs...

in any case pouring a slab over a slab thats cracked will only lead to
more work, and expense of demoing 2 slabs and hauling them away
take a photo of the old cracked slab, the new slab will soon have
cracks in the same places

The existing slab is 10 years old, reinforced with rebar, and has NO
cracks.

That said, I may just tear it out anyway just to be on the safe side.

Thanks,

Anthony Watson
www.mountainsoftware.com
www.watsondiy.com