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Started By
Message
Clay stabilization for slabs
Posted on 5/8/26 at 5:37 pm
Posted on 5/8/26 at 5:37 pm
Anyone heard or ever been involved with this? We're having some cracking at the barndo that's been bothering me and I've got an outfit that does the ground injections coming next week to test the site. I'm interested in how well it works.
4
Posted on 5/8/26 at 9:15 pm to Wraytex
In the San Antonio area it's referred to as "snake oil". It was used at Incarnate Word to stabilize their old chapel. Raba-Kistner Engineers are familiar with the process.
Posted on 5/8/26 at 9:32 pm to Wraytex
Central Mississippi has heavy clay. We usually just remediate it down about 3 feet and haul some good dirt in. Still have a lot of foundation problems.
You would think they could just engineer a slab to handle that in an cost-effective fashion.
You would think they could just engineer a slab to handle that in an cost-effective fashion.
Posted on 5/9/26 at 9:29 am to Spankum
is this still a problem if the soil is properly compacted?
Posted on 5/9/26 at 9:42 am to Jmcc64
quote:
is this still a problem if the soil is properly compacted?
Yes, clay soils expand and contract so much when exposed to moisture that it causes problems. In August, there will sometimes be 3” gap between the soil and my foundation,
Posted on 5/9/26 at 10:36 am to Spankum
We have heavy clay where my house is.Guy that built it had a bunch of pier holes drilled,stuck rebars down the holes and they were filled with cement when pouring the slab.
House is 26 y.o.,no cracks.
His fil had a business fixing cracked slabs,old man made a shite-ton of money.
There are other ways to deal with clay soils.One is to have a system to keep the clay damp with soaker hoses,something like that.
Some people do post tension slabs.
Guy that did my house felt pier holes was best.
House is 26 y.o.,no cracks.
His fil had a business fixing cracked slabs,old man made a shite-ton of money.
There are other ways to deal with clay soils.One is to have a system to keep the clay damp with soaker hoses,something like that.
Some people do post tension slabs.
Guy that did my house felt pier holes was best.
This post was edited on 5/9/26 at 10:43 am
Posted on 5/9/26 at 12:39 pm to LSUA 75
quote:
One is to have a system to keep the clay damp with soaker hoses,something like that
Interesting…I am surprised I hadn’t thought of that!
Posted on 5/11/26 at 8:37 am to Spankum
crawlspace not an option? after living on slabs in apts and a duplex for 15-20 yrs. no way I would've built on a slab.
Posted on 5/11/26 at 2:50 pm to Jmcc64
i don't see that as practical in my case, i'm meeting their quote/answers guy on thursday
Posted on 5/11/26 at 10:45 pm to Wraytex
Install a post tension slab. Will definitely help. You may get a few minor cracks but. Nothing major.
Posted on 5/12/26 at 2:11 pm to Wraytex
I don't see remediation working for a slab poured on fat clay. It will still shrink and swell depending on the amount of ground water.
If you're talking about cracking around the perimeter the foundation can be stabilized but if the clay shrinks under the slab it will start cracking because it is no longer supported.
If you're talking about cracking around the perimeter the foundation can be stabilized but if the clay shrinks under the slab it will start cracking because it is no longer supported.
Posted on 5/12/26 at 9:26 pm to junkfunky
Chemical injection will stop the movement.
Posted on 5/13/26 at 4:20 pm to Maniac979
quote:
Chemical injection will stop the movement.
How does that work? I'm not aware of any way to chemically change fat clay into lean clay. The clay itself is what is changing shape depending on ground moisture. Is there a way to keep it constantly in a state of full saturation after the fact?
Posted on 5/13/26 at 9:14 pm to junkfunky
I have no idea how it works but it has been used extensively in the San Antonio area for decades.
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