A gloved hand holding a steel injection port in a drilled hole in a concrete walkway beside a canal

Void Filling Experts in Fort Lauderdale Florida: Concrete Void Fill and Soil Stabilization Under Slab

Affordable Void Filling and concrete void fill in Fort Lauderdale, FL and Broward County

Empty space under a slab is a problem that grows, and Fort Lauderdale Concrete Repair & Leveling fills it across Fort Lauderdale, FL and Broward County. We do void filling under concrete, soil stabilization beneath slabs and seawall void filling for homeowners, condo boards and property managers. Foam goes in through narrow holes, expands into each pocket and locks the loose soil in place. A level slab keeps its footing, and a slab that already dropped rises with the foam.

Why homeowners choose us:

Free written estimates for every leveling job
Small injection holes patched and cleaned up after every lift
Water-resistant foam that does not wash out
Warrantied work every lift backed by a written warranty
Licensed and insured certificate on request

15+ years of lifting slabs in South Florida and 900+ slabs raised back the work. A void cannot be seen from above, so the estimator taps the slab and probes the edge before giving a price. Your price comes in writing at no charge, and a written warranty covers the job. Plan on 2 to 6 hours for most voids.

(954) 738-4852 Get a Free Quote

Get a FREE Concrete Leveling Quote

What Void Filling Involves in Fort Lauderdale, FL

Void filling treats the actual cause of a sunken slab, which is missing soil underneath it. Your written estimate can break the work into any of the services below, each with its own price, so you decide how much of the job to approve before the crew arrives:

Concrete void fill sends polyurethane foam into the empty pockets beneath a slab, so the concrete stops flexing over open air.
Soil stabilization under slab binds loose sand with expanding foam until the ground can bear weight once more.
Edge washout filling closes the gap along a driveway, patio or deck border so you can fill void under slab edges before they spread, since rainwater gets in at the perimeter first.
Seawall void filling fills the hollow opening behind a cap when backfill escapes through joints in the wall.
Lift and fill together raises a slab that already sank while the foam occupies the space it left.
Hole patching plugs every injection point with sanded concrete, leaving a finished surface.

When You Need Void Filling in Fort Lauderdale

A void usually gives itself away as a sound or a gap well before any slab drops. Fill the space while the concrete still sits level and the bill stays small, so a hollow thump underfoot is reason enough to phone.

Signs You Have a Void Under Your Concrete

A drumming noise underfoot means the slab rests partly on air, and a heavy load could crack it.
A crack of daylight along the slab edge shows where soil has washed away, and each storm removes more.
Sand left on the pavement after rain came from under the concrete, so the cavity is still enlarging.
A slab that rocks when stepped on lost support at one spot, and cracks now carry the strain.
A dip behind a seawall cap signals escaped backfill, with the neighboring yard next in line to sink.

Why Void Filling Is Harder in Fort Lauderdale

Voids open fastest where fine sand meets moving water, and Fort Lauderdale has both. These local conditions explain why a cavity grows here faster than it would in drier ground.

Fine sand that follows the water

Federal soil surveys of Fort Lauderdale name Basinger, Boca, Hallandale, Immokalee and Dade fine sand, and loose sand fill compacts badly. Grains drift wherever water travels through them. A leaking joint turns into a channel, and after a few seasons the channel is a cavity beneath the slab. The slab then flexes above the cavity, and the new cracks admit even more water. Because the city rests on this material nearly everywhere, the pattern repeats from one street to the next.

Groundwater at the surface

In the wettest months the water table touches 0 inches in Basinger and Boca fine sand and sits roughly 3 inches under the ground in Hallandale fine sand. Every rise and fall drags sand from under the slab. Limestone lies roughly 12 inches below Hallandale fine sand and about 30 inches below Boca fine sand. Only a shallow sand layer sits above the rock, so even a small loss leaves a deep gap. Sizing that gap is the first step of soil stabilization under a slab.

Seawall concrete repair and washed-out backfill

The Fort Lauderdale-Hollywood station records about 56 inches of rain across a typical year, and nearly 70% falls between mid-May and mid-October. Water soaking the yard behind a seawall flows toward the wall and escapes through joints and weep holes, carrying fill along. For this problem, seawall repair means filling the hollow behind the cap before the lawn drops or the cap splits. Because the hollow cannot be seen from the water side, the estimator probes the ground along the cap line.

How Much Does Void Filling Cost in Fort Lauderdale, FL?

Foam goes in through the same holes as a lift, so the void is priced along with the slab above it. Void size and the surface overhead decide where your number lands.

Job	Typical price	Key variables
Driveway void and lift, foam	$750 to $5,670	number of slabs, depth of settling
Pool deck void and lift, foam	$750 to $5,940	larger voids, size, access around the pool
Patio void and lift, foam	$750 to $4,725	size, depth of the void, access
Sidewalk void and lift, foam	$750 to $3,240	length of the run, number of slabs
Stone slurry grout, most residential jobs	$750 to $1,500	void depth, access to the slab

Expect foam to land 20 to 50 percent above mudjacking or stone slurry grout, yet it shrugs off water and stays where it is placed. Crews can fill the cavities beneath a driveway and a pool deck on one trip, which saves a second mobilization, and a neighboring sidewalk can join the visit.

Our Void Filling Process in Fort Lauderdale, FL

Finding a void and filling it takes four stages, each spelled out in the estimate. A single slab is a morning’s work, whereas a long seawall run or a large pool deck may fill the whole day.

1. Free Estimate and Sounding

Phone in with the sound or the gap you spotted and we pick a time. The estimator taps along the slab to locate hollow spots, then probes the edge to learn how deep the cavity runs. A free written estimate follows, listing each void on a separate line, and nothing is altered unless you approve it first. You see the full scope on paper before anyone drills.

2. Mapping the Voids

Next the crew flags injection points about five feet apart over each hollow area, adding extra marks along the edges where washout starts. On a seawall job the flags run along the cap behind the wall. Furniture and planters get moved first, before any drilling begins. A slab already broken into small pieces gets a verdict on site, either fill and lift or replace.

3. Foam Into the Pockets

The crew bores narrow holes and seats a port in each. Liquid polyurethane foam then enters under pressure and swells through the pockets inside each cavity while gauges report when the soil has firmed up. If the slab has sunk as well, a slow second pass raises it toward its old height. The foam hardens within the hour, so the ground is stable before the crew leaves.

4. Patching and Final Sounding

Sanded concrete fills every hole, then the crew taps the slab a second time to confirm the hollow sound has disappeared. Foot traffic is fine after 15 to 30 minutes, and heavy loads should stay off for about two days. The area is swept clean before the crew drives away. The written warranty arrives with your final price, so the paperwork stays in your hands and the terms are plain.

Void Filling FAQs: Fort Lauderdale, FL

How much does void filling under concrete cost in Fort Lauderdale?

Foam work runs from $750 to $6,075 because a void is priced together with the slab over it. Where your job falls in that spread depends on void size and the surface above. The free written estimate itemizes every void before work begins.

What creates a void under a slab?

Water pulls sand out from under the concrete through joints, cracks and edges. The ground in Fort Lauderdale is fine sand, and groundwater rises to the surface in wet months, which makes cavities form fast.

Can you fill a void without lifting the slab?

Yes, a slab that still sits level can be stabilized with foam alone, no lift required. Acting at that stage costs the least because the concrete has not cracked yet.

Is seawall void filling the same as seawall repair?

Filling the hollow behind the wall is one part of seawall repair, not the whole of it. A wall that failed outright or leans needs another repair, and the site visit shows which situation you have.

How long does the work take?

Plan on 2 to 6 hours for most voids. A long seawall run or a large deck can take a full day or more.

Will the voids return?

Foam repels water and will not wash out, so it keeps the soil where it was placed. Should a covered slab settle again, the written warranty applies.

Is the work covered by a warranty?

A written warranty comes with every job, and its terms appear in your estimate before work starts. Ask the office to walk you through it when you call.

Fort Lauderdale Concrete Repair & Leveling serves Fort Lauderdale and Broward County.

Get a Free Void Filling Quote in Fort Lauderdale, FL

(954) 738-4852 Get a Free Quote