Quote:
Originally Posted by blkgsr
you always over excavate...but it's normally only by about 5-6" to put down a layer of 3/4" rock (and poly) prior to pouring the slab
but as you say, if it was over excavated by a decent amount then back filled and not packed it theoretically could have settle but generally the slab would have settled a little with it (slab on grades are generally not reinforced or just have wire mesh) and you'd see a lot of cracks
but anything is possible
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This is what most likely happened. Instead of spending so much time compacting the backfill they'll just fill it in and it will settle over time.
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