Concrete/ Cement slab patio - settled toward house?

Question

My concrete slab patio has started to settle.  I think it is about 10 years old, is about 8x12 feet rectangle, and (remarkable) has not cracked.   It does have a sawn 'joint' in the middle.

BUT, it has settled toward the house, allowing the rain water to drain between the corner of the slab and an inside corner of the house.  (The house forms two edges of the patio.)

I know that I can have it jackhammered out, re-leveled and re-poured, but would rather know more about concrete lifting.

1) Do they have to drill holes thru the concrete slab?
2) Does the jacking process crack the slab?
3) Because the low spot is in a corner, how dangerous is this to the house itself?

Educated responses, please.  I appreciate the feedback from people who do this for a living, have priced it (and either did or rejected it), or other people who have worked with concrete.

Anonymous · Accepted Answer

An area to check is the junction between the slab and the house. It can be jacked up but....if the slab has setteled AND shifted toward the house then the house maay jam the slab when you go to jack it. That could cause it to crack. Yes they drill holes into the slab and pump a slurry of concrete under to move  the slab.
Eric

mdlbldrmatt135 · Answer

Yes.. typically requires drilling several holes thru the slab.
the slab COULD crack at that saw kerf "joint" 

the only potential would be water getting into the basement... which you'd probably see by now.  If there was an Issue the jacking would probably come out on the exposed ends, unless there's something making the house foundation weak.

I'd call a Concrete jacking company for an Estimate....  It might wind up cheaper to replace it.

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Concrete/ Cement slab patio - settled toward house?

2 Answers