My 24'x35' shop has a concrete slab floor. Theres a crack that runs all the way across at an angle. It was there when we bought the place almost 20 years ago, but I'm pretty sure it's gotten wider. Like you can drop a quarter in it on edge. What concerns me is that on one side of the crack the floor feels distinctly hollow. Boomy echo, excess vibration. But it's only in an area about six feet across, right in the center.
I'm guessing I've got a washout problem underneath, but I'm on flat ground and there are no obvious run offs to the edge. The ground is kind of soft in that whole area though.
What do you guys think? What's the repair procedure on something like that?
You probably could drill a hole and squirt grout into it. Have a local foundation repair guy come out and look at it.
CJ
HalfDork
8/27/19 4:07 p.m.
There are two types of concrete: Concrete that is cracked and concrete that is going to be cracked.
That's all I've got.
One other thought - If it isn't a washout, could it be a sinkhole?
Shadeux said:
Have a local foundation repair guy come out and look at it.
For me at least I know my "lane," for something like this, I'm calling a professional.
Mud Jacking is the process of forcing grout under pressure that will either fill any voids under the slab and/or lift it.
I had it done once to lift/level some walks, etc. around my house that settled over the years.
In fact I need to get it done again.
Are there known karst issues in your area?
In reply to jimbbski :
We had our driveway and walk raised. Worth it.
In high school a builder had us break up a driveway with sledges. Raise up a piece and hit and it breaks easily. Be careful if you have a void with a heavy object hitting it.
In reply to Scotty Con Queso :
I dont think so....because I have no idea what that is...
Okay, after a quick google, its possible. I'm right at the top edge of the karst region that covers FL and coastal ga - sc. Although I think waterlogged squishy clay is more likely.
