stump under a slab

Rocks_and_Trees

Rocks_and_Trees

Location
AZ
Does anyone know of any issues of grinding a stump and then laying a cement slab over it? I had a customer ask me about this today. He was wondering if the settling of the ground stump could compromise the slab. I didn't really have an answer for him, but told him I'd try to find out. I thought maybe just cutting the stump below grade, but it's kind of a monster mesquite. Any one else have any experience?
 
I don't have experience with this, but I do have plenty of speculation.
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I would think it would be best to back fill the hole with sand. The sand would probably need tamped down with a machine. This would allow the sand to fill in as much airspace as possible. Level the sand. Then pour the concrete slab.

If the hole was only backfilled with wood chips, then good night! There would be a void under the slab when the chips decompose. And I take it, you probably thought of that already.
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Your avatar looks like Rich H's, Rocks and Trees!



I would think that if the stump was ground, you would be best to excavate all of the woody material and backfill with packed dirt or sand (good idea, Jamin!)


Left to it's own devices, a hole filled with stump grindings will soon "disappear", leaving only a hole.


SZ
 
definitely excavate the stump then compact the fill. Unless the concrete is reinforced to support the loading that would occur it'll be a weak area for sure.
 
Thanks for the replies. I figured removing the stump grindings would be a good idea. Back filling the hole with dirt is the least expensive and obvious answer I suppose.
 
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