Repairing a settled concrete slab

https://i.imgur.com/V5Z2WqG.jpg

https://i.imgur.com/dMScJrD.jpg

https://i.imgur.com/1vvY616.jpg

https://i.imgur.com/ftZ0pWX.jpg

https://i.imgur.com/jB2AAeu.jpg

Three dead groundhogs later, a section of our 22 year old patio slab settled and I was perplexed as to what to do. I found this firm that injects limestone slurry under pressure to lift sunken slabs and 1 hour later, magic. I’m waiting on the epoxy filler to blend in some sand and sandstone pea gravel and then I’ll seal the slab…very impressed and pleased.

As the owner of a lot of concrete now, that is pretty trick. Always good to know what is possible.

Who knew?

I saw the thread title and thought you are effed.

But no.

That's impressive. My sister worked for, then owned for a short time, a company in Oregon called Earth Anchors. They used helical piers to pin, hold and even raise footings and foundations. But I did not know about raising a patio/slab by injecting something under it. That's a neat trick. Hope it lasts.

Quote:

---

Originally Posted by bking

That's impressive. My sister worked for, then owned for a short time, a company in Oregon called Earth Anchors. They used helical piers to pin, hold and even raise footings and foundations. But I did not know about raising a patio/slab by injecting something under it. That's a neat trick. Hope it lasts.

---

Bruce..checked out the firm and process…been around 25 years and the tradespeople that did the work were quite knowledgeable and have both been with the firm for almost 15 years. We used a similar process on a project near the Oregon coast to lift interior building slabs with similar success about 10 years ago…no issues. I just need it to last another 25 years. FWIW, there is a $500 minimum and I spent $685.

Thanks for the tip. I need this. I've considered a D.I.Y. using foam than remembered I'm a over-educated know it all who should know better ;) I'll let the professionals handle it.

I had a bad experience with the foam process. I'd rather not relive the details, other than the foam makes a lot of heat during the process.

Mudjacking is the way to go for sure.

Apparently this is a problem in parts of Colorado and this method is used all the time. My brother who lives in the Denver area in a 1980s era (well constructed house) says that all the driveways in the area often settle at different rates so all concrete slabs/sections need work every once in a while so they do not fully crumble and fall apart. It has something to do with the underlying soil.