Concrete leveling
Void Filling Under Slabs in Rockford, IL
A void is the stage before a sunken slab. The concrete is still where it should be but there is nothing underneath holding it there, and it is only a matter of load and time.
Cause
Why This One Settles
This is the only service on the site that is bought before there is a visible problem, which makes it the one most people have never heard of.
- Water moving under a slab carries fine soil particles with it and deposits them somewhere else, leaving an air gap behind.
- A broken or leaking buried line washes soil out continuously rather than seasonally.
- Poorly compacted utility trenches settle away from the slab above them without the slab immediately following.
- Around here, a slab can bridge a surprisingly large void for a long time before anything shows on the surface.
The underlying reason any of it moves here is the frost line. Rockford requires footings at 42 inches because the ground freezes that deep, and flatwork is poured well above it. Full explanation on why concrete sinks in Rockford.
The work
How This Job Runs
- Step 1
Find the void. A hollow sound under a tapped slab is the usual first sign, and the extent is rarely what it looks like.
- Step 2
Inject to fill without lifting, which takes a lighter hand than a lift does.
- Step 3
Confirm the fill by sound and by resistance rather than by volume used.
- Step 4
Address the water source, because a void that was washed out once will wash out again.
When lifting is the wrong call
Where This Does Not Work
If the void was caused by a leaking sewer or water line, filling it first traps the leak under a sealed slab. The line gets fixed first. Any crew willing to skip that step is selling you the same job twice.
Cost
What It Runs
Void filling is priced on material used rather than area lifted, so a small void found early is one of the cheapest calls on this list.
Full per-square-foot breakdown and the comparison against replacement is on the pricing page, and the method choice is covered on mudjacking versus foam.
By town
Void Filling Near You
What the concrete is like varies more across this metro than people expect.
Need void filling in the Rockford area?
Send a photo of the slab and roughly how far it has dropped. You get a fixed quote back.