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Void Under Garage Slab

 
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Old 11-25-2017, 11:16 AM   #1
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Void Under Garage Slab


Son has 3 stall garage with floor drain in middle. Sounds to me area around drain is hollow around drain area. No cracks, settlement.

He's thinking of coring a 4" hole, filing with flowable fill.

Would it be better for him to get someone in there to pump it in there?
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Old 11-25-2017, 12:51 PM   #2
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Re: Void Under Garage Slab


How much of a void? If it's only a cubic foot or 2, getting a truck and pump there probably isn't gonna work.

I know some guys will set the floor drain in gravel. I've always wrapped mine in foam and set it in the 'crete. Don't know if that's the right way to do it.


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Old 11-25-2017, 12:54 PM   #3
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Re: Void Under Garage Slab


Drag a logging chain or a tow chain across the floor and you will know how far the void extends.

Former company I worked for had a hand grout pump and we would set a wedge anchor in the slab, but with a hole drilled in the wedge. Connect the hand grout pump and fillerup. Sika 212 works fine. mortor over the anchor hole or not. Your call.
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Old 11-25-2017, 01:03 PM   #4
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Re: Void Under Garage Slab


Quote:
Originally Posted by jlhaslip View Post
Drag a logging chain or a tow chain across the floor and you will know how far the void extends.
Never heard of that. Does that work pretty well?



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Old 11-25-2017, 04:23 PM   #5
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Re: Void Under Garage Slab


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Originally Posted by Seven-Delta-FortyOne View Post
Never heard of that. Does that work pretty well?



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Works great. The change in the sound of the chain rattling is a dead give away for the void.
Used it to find voids and separations on Bridge decks with high density overlays.
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Old 11-25-2017, 11:15 PM   #6
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Re: Void Under Garage Slab


Quote:
Originally Posted by jlhaslip View Post
Works great. The change in the sound of the chain rattling is a dead give away for the void.
Used it to find voids and separations on Bridge decks with high density overlays.
seems like a good idea. i've always just used a hammer and tapped on the floor.
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Old 11-26-2017, 10:59 AM   #7
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Re: Void Under Garage Slab


It could be that the slab is reinforced with grade beams and that it is essentially self supporting and the settlement of the soil is no big deal.

Around here most home builders opt for a grade beam slab in the garage so they don't have to be concerned with finding appropriate fill material, compacting the soil in lifts and paying a "dirt burner" to stand there and watch.

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