Heaved garage pad

[MostH8d]

I have been thinking about finishing my 30x40 garage floor lately and have read through countless threads about all the different methods. One of the problems I am dealing with though is a heaved pad at one of the expansion joints. The pad that is heaved almost feels like there isn't anything under it. If I bounce up and down on it i can see the pad move slightly. Is there anyway I can lower the pad so it is flush with the one next to it other than grinding it down?

It doesn't bother me that much now, but I'm worried that if I put on an epoxy finish or stain it that it will be even more noticeable.

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[Milton Shaw]

Sounds like you need to call someone that does mud jacking and get some grout under the slabs so that they be stable. No grinding should be done before that is accomplished as its going to thin the slab and with the slab floating it would probably break. You are going to have problems forever if they are not supported on that loose fill under them.

 

[ard]

Why did it heave?!?!

Until you fix that, I wouldn't put more money into the floor (or structure)....

 

[brownbagg]

that not a heave slab, you got a subsoil problem, looks like an expansion clay that got wet and started picking up the slab

 

[Northern Early]

judging from the light in the top right of the picture (guessing that is sunlight through an open door) (aka an exterior wall), id guess that the other side of that slab has dropped, cantilevering what is seen in the picture.

x2 on calling in someone that can lift and fill to correct the situation.

 

[ard]

...

id guess that the other side of that slab has dropped, cantilevering what is seen in the picture.
.

Which would explain why OP senses 'hollowness' under the raised part...

 

[MostH8d]

I don't think the other side by the wall/door has dropped. At least I don't see any signs that it has. Everything along that wall appears as it should as far as the pad goes

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[ard]

How long since installed?

Site prep prior to pour?

LOCATION?????

Exposure to water? In general area, water table, run off....

 

[RVDan]

How big is it? Can you lift it and level the soil under it?

 

[MostH8d]

Not sure how old it is. I bought this house a year ago. It was built in 98. I'm in southeast Michigan. My land is pretty flat. No noticeable water running off that I can see, but definitely no standing water either.

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[Jackfre]

I think I would install a dry well outside the building adjoining that area. Water or erosion or frost is about all I can think of other than the improperly compacted soil previously mentioned.

 

[kbs2244]

Call a mud jacking guy.
He will tell if he can fix it or not.

The ones I have worked with will not try something they are not sure of.
And most have seen all kinds of slab problems and can tell you what your problem is.