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Old 01-25-2014, 01:56 PM   #1
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diy slab stabilization.


Apologize if this is a dumb question. I have a 16 foot by 12 foot slab that the clay fill has shrunk away from. It's a bit cracked and uneven and I want to fill the areas below that are unsupported. I don't need to raise the slab at all, just fill the void which is generally about 1 inch over the slab area. (I can see it from the edge). Is it feasible to drill holes and just pour in some kind of grout to fill this void? I realize it would take quite a few holes. Is there a better material to use for this? It's going to need to be thin to pour obviously.

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Old 01-25-2014, 02:43 PM   #2
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diy slab stabilization.


Ayuh,.... I doubt yer plan would work all that well,...

Look into "Mud-jacking",....

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Old 01-25-2014, 04:28 PM   #3
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diy slab stabilization.


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Originally Posted by Bondo View Post
Ayuh,.... I doubt yer plan would work all that well,...

Look into "Mud-jacking",....
Yeah, after thinking about it a little more your right. Not going to work.
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Old 01-25-2014, 04:36 PM   #4
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diy slab stabilization.


May be time to bust that whole slab up and redo it.
Clay is a very poor material to use under any slab or footing.
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Old 01-25-2014, 07:30 PM   #5
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diy slab stabilization.


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Originally Posted by joecaption View Post
May be time to bust that whole slab up and redo it.
Clay is a very poor material to use under any slab or footing.
Looking up underneath the slab from an accessible crawl space I have to agree. Looks like the whole slab is just floating there. House was built in 1925 and this was originally an open portico for carriages. Don't know if the slab was original to the house but it's plenty old and very hard.
Because it was originally an out door slab it slops away from the house as well as north to south. It has walls on it now so the new slab will have to be similarly slopped. The parameter seems to be unbroken and uncracked for at least 16 inches out from the 3 exterior walls. So I was thinking to cut out the interior portion of the slab leaving the 16 inches. Does that make sense?

Last edited by Mike in Arkansas; 01-25-2014 at 07:36 PM.
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Old 01-25-2014, 10:28 PM   #6
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diy slab stabilization.


Ayuh,.... Or search out a Mud-jacker that'll travel to yer locale,...

They can drill a few holes, pump it fulla mud, at a few thousand psi, 'n call it a day,...

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