Foundation Repair in MO & IL, including St. Louis, Springfield & St. Charles.
Foundation Repair

Sinking/Settling Concrete Floor Slabs

diagram of a repaired concrete slab floor

Concrete slab piers being used underneath a floor to help stabilize the floor permanently.

Notice how the piers can extend deep below the floor, extending until they reach competent supporting soils.

The Problem:

Your concrete slab floor is showing signs of sinking, sagging, or settling. Your floor may be cracking, or the walls may be separating from the floor below or ceiling above.

Telltale Signs:

How to Fix It:

Install a slab pier system underneath your concrete slab floor. These piers can extend down to strong supporting soils, ensuring long-term support.

We can fix your cracked slab floors once and for all! Call us for a free floor slab repair quote today!

We serve Springfield, St. Charles, St. Louis, and many nearby areas in Illinois & Missouri.

Signs Of Slab Settlement

When a floor slab settles, the damage can manifest itself in many ways. Along with cracks in the concrete, the floors can separate from the walls as they sink downwards. Alternatively, the interior wall may be pulled down with the floor, instead separating from the ceiling. Walls can also pull away from other walls, and interior wall cracks can form -- commonly off the corners of interior doors.

(Click each photo to enlarge.)

Slab floor cracks showing in a O'Fallon, IL home Large slab floor cracks in a Paducah home A floor slab separating from the wall in a Edwardsville home. A partition wall separating from the floor in a Collinsville home.
a sinking floor leaving a large gap between the wall and floor in a Alton home The ceiling and wall separating as the wall sinks with the slab floor in a Arnold home partition walls being pulled away from the foundation walls in a Cape Girardeau home. wall cracks along a doorway in a Urbana home.

What Causes A Concrete Floor Slab To Settle?

When a concrete floor settles, it can mean serious damage to your home. The causes of floor slab settlement are almost always due to the soils underneath being unable to support the weight of the concrete. They often accompany other foundation problems in your home.

The three most common causes of settling concrete floor slabs are as follows:

(Click for more information.)

Dry, cracking clay soils Drying/Shrinking Of Soils Under The Slab soil erosion Washout Of Soil Underneath The Slab A backhoe excavating a foundation Poor Compaction Of Foundation Fill Soils

Fortunately, there are fast, effective ways to address concrete slab floor settlement issues. if you would like a free foundation slab stabilization quote for your problem, call or e-mail us today!

Installing The Foundation Supportworks Slab Pier System

Foundation Supportworks Slab Pier System stabilizes the concrete floor slab in your home. It provides the best opportunity to relevel the floor and lift non-load bearing partition walls that may have settled along with the slab. To install our system, our contractor will take these six steps:

Coring the concrete of a concrete slab floor in Granite City

Preparing for Installation

Before the installation day, a representative from our company will have already inspected your foundation issue. At that time, a foundation repair proposal was put in writing.

Your foundation repair experts will use that proposal to map out the locations where the slab piers will be installed.

At the beginning of each slab pier installation, a small hole is cored through your concrete slab floor. This hole will create an access point for the slab piers that are about to be installed.


A three piece foundation slab bracket assembled underneath a concrete slab floor.

Position Slab Bracket

To give the slab pier something to "lift", a slab bracket is positioned beneath the concrete slab.

The Foundation Supportworks Slab Pier System uses a three-piece slab bracket that is assembled underneath your concrete floor, allowing for a much smaller hole to be cored in your concrete slab. Additionally, this larger bracket reaches across more area along your floor, creating a more even distribution of weight.


Driving foundation piers into the floor in Danville.

Install Steel Tubes

Steel tubes are hydraulically driven down through the bracket to the competent soils beneath.

These steel tubes are the real strength of the foundation pier system -- and are responsible for transferring the home weight to strong supporting soils.

To prevent corrosion, Foundation Supportworks has slab piers available that are designed using galvanized steel. This ensures the quality and long-lasting strength of your slab pier system.


Using steel slab piers to transfer the weight of the concrete slab to the soil beneath in O'Fallon.

Transfer Slab Weight To Soil

The weight of the concrete slab is transferred through the piers to the load-bearing strata underneath your home.

As the system lifts your concrete slab floor upwards, the sinking movement of your floor will be permanently halted.

Often, it will also be possible to lift the concrete slab back to a level position.


A foundation slab pier after installation and grout injection has been completed in a Chesterfield home.

Inject Grout Fill

Once the concrete slab has been lifted, a void will be present underneath the floor.

Additionally, if your floor had been sinking because of compacted soil or washout, a gap existed even before the installation.

To address this, we carefully pump grout under the slab to fill in all empty spaces.


Repairing the cored holes in the concrete slab floor with fresh concrete and cleaning up the St Peters home.

The Cleanup

At Woods Basement Systems, Inc., we take pride in leaving your home looking clean and neat. Once the installation is completed, we repair all cored holes with concrete, making your final installation virtually invisible.

Any debris generated during the installation is cleaned up and removed by us. And once we're done, you can rest easy, knowing that that you have a 25-year warranty on manufacturer's defects, as well as a performance warranty from us.

What NOT To Do

As with most home repairs, some work all of the time, some work some of the time, and some don't work at all. Here are two "fixes" that we at Woods Basement Systems, Inc. do NOT recommend:

Jackhammering a slab floor in a Champaign home.

A concrete slab being jackhammered and removed during a floor replacement in Charleston. A typical replacement can take several weeks to complete.

Concrete Slab Replacement:

To perform a job like this, all home furnishings, floor coverings, and interior walls must be removed. Then a crew jackhammers the existing floor into small pieces and removes them by hand.

Once this is complete, a new floor is poured and the homeowner must allow two weeks for the grout to cure sufficiently.

The interior partition may be rebuilt, floor coverings may be reinstalled, and home furnishings may be returned.

While this situation is disruptive and expensive, the real problem here is that the issue that caused the problem in the first place has not been addressed. Without addressing the soil problems that lead to the floor cracks, your new floor may "break" over time too!

smoothing out the grout in a slab releveling project in Belleville

A contractor smoothing out a surface of releveling grout during a concrete slab repair. The previous concrete floor had shown cracks during settlement.

Releveling Grout On Top Of The Slab:

To begin this process, all floor coverings that were placed on the slab must be removed. The floor is then prepared so that grout will be able to bond with the slab surface.

A self-leveling grout is poured along the slab surface, where it begins to fill in the low portion of the floor and create a level surface. After the grout is allowed to cure for several days, the floor coverings can be replaced.

However, if the floor wasn't prepared properly, the grout may not bond well to the surface of the slab, leading to chunks of it breaking off. Additionally, the grout will add weight to the slab, potentially making the situation worse by causing further settlement. And, just like with the last two options, the real problem of soil settlement is not addressed!

Looking For Foundation Slab Repair Contractors In MO & IL?

At Woods Basement Systems, Inc., we provide proven solutions for concrete slab floor leveling -- as well as other foundation repair solutions -- to homeowners throughout Illinois & Missouri. We provide each of our customers with a free, no obligation slab repair quote, in writing, before any work is done. To schedule your appointment, call or e-mail us today!

Our service area includes St. Louis, Springfield, St. Charles, and nearby areas such as Decatur, O'Fallon, St Peters, Champaign, Florissant, Chesterfield, Belleville.

Drying & Shrinking of the Soil Under the Slab

HVAC (Heating, Venting, and Air Conditioning) systems may be installed beneath the floor slab. Over time, the ductwork can leak air, which can dry out the soil.

As the soil dries and shrinks, gaps form under the floor slab, creating voids. Because the soil no longer supports the floor slab, the floor begins to crack and sink into the voids.

street creep symptoms in a driveway in Charleston

Washout of Soil Under the Slab

This is usually caused by plumbing leaks. If the plumbing leak is severe and there is a path for the water to flow through, it can wash soil out from under the slab.

With a void underneath the floor, there's nothing supporting the concrete slab anymore. In time, it begins to crack and sink downwards.

garage walls cracking due to street creep

Poor Compaction of Fill Soil

During construction of a new home, layers of soil are commonly moved around or spread out to get to the desired grade level. When the home is built, footings may be deepened to extend below weak fill soils and avoid a foundation settlement issue.

The slab, however, remains on the fill soils. If the fill was poorly compacted, the fill soil compresses and settles, and a void is formed under the slab. In time, the slab cracks, breaks, and settles into the void.

foundation wall cracks due to street creep in Charleston

Looking for a price? Get a no cost, no obligation free estimate.

Serving MO & IL including the Greater St. Louis area
Our Illinois & Missouri Service Area
Cities in Alexander County, IL
Cairo
Mc Clure
Miller City
Olive Branch
Tamms
Thebes

Cities in Bond County, IL
Greenville
Mulberry Grove
Pierron
Pocahontas
Smithboro
Sorento

Cities in Calhoun County, IL
Batchtown
Brussels
Golden Eagle
Hamburg
Hardin
Kampsville
Michael
Mozier

Cities in Cass County, IL
Arenzville
Ashland
Beardstown
Bluff Springs
Chandlerville
Virginia

Cities in Champaign County, IL
Bondville
Broadlands
Champaign
Dewey
Fisher
Foosland
Gifford
Homer
Ivesdale
Longview
Ludlow
Mahomet
Ogden
Penfield
Pesotum
Philo
Rantoul
Royal
Sadorus
Saint Joseph
Savoy
Seymour
Sidney
Thomasboro
Tolono
Urbana

Cities in Christian County, IL
Assumption
Bulpitt
Edinburg
Kincaid
Morrisonville
Mount Auburn
Moweaqua
Owaneco
Palmer
Pana
Rosamond
Stonington
Taylorville
Tovey

Cities in Clark County, IL
Casey
Dennison
Marshall
Martinsville
West Union
Westfield

Cities in Clay County, IL
Clay City
Flora
Ingraham
Louisville
Sailor Springs
Xenia

Cities in Clinton County, IL
Albers
Aviston
Bartelso
Beckemeyer
Breese
Carlyle
Germantown
Hoffman
Huey
Keyesport
New Baden
New Memphis
Trenton
Clinton County

Cities in Coles County, IL
Ashmore
Charleston
Humboldt
Lerna
Mattoon
Oakland
Trilla

Cities in Crawford County, IL
Annapolis
Flat Rock
Hutsonville
Oblong
Palestine
Robinson
Stoy
West York

Cities in Cumberland County, IL
Greenup
Janesville
Jewett
Neoga
Toledo

Cities in Dewitt County, IL
Clinton
Dewitt
Farmer City
Kenney
Wapella
Waynesville
Weldon

Cities in Douglas County, IL
Arcola
Arthur
Atwood
Camargo
Hindsboro
Murdock
Newman
Tuscola
Villa Grove

Cities in Edgar County, IL
Brocton
Chrisman
Hume
Kansas
Metcalf
Paris
Redmon
Vermilion

Cities in Edwards County, IL
Albion
Bone Gap
Browns
Ellery
West Salem

Cities in Effingham County, IL
Altamont
Beecher City
Dieterich
Edgewood
Effingham
Mason
Montrose
Shumway
Teutopolis
Watson

Cities in Fayette County, IL
Bingham
Brownstown
Farina
Hagarstown
Ramsey
Saint Elmo
Saint Peter
Shobonier
Vandalia

Cities in Franklin County, IL
Benton
Buckner
Christopher
Coello
Ewing
Frankfort Heights
Logan
Mulkeytown
Orient
Royalton
Sesser
Thompsonville
Valier
West Frankfort
Whittington
Zeigler

Cities in Gallatin County, IL
Equality
Junction
New Haven
Omaha
Ridgway
Shawneetown

Cities in Greene County, IL
Carrollton
Eldred
Greenfield
Hillview
Kane
Patterson
Rockbridge
Roodhouse
White Hall
Wrights

Cities in Hamilton County, IL
Broughton
Dahlgren
Dale
Macedonia
Mc Leansboro

Cities in Hardin County, IL
Cave In Rock
Elizabethtown
Karbers Ridge
Rosiclare

Cities in Jackson County, IL
Ava
Campbell Hill
Carbondale
De Soto
Dowell
Elkville
Gorham
Grand Tower
Jacob
Makanda
Murphysboro
Oraville
Pomona
Vergennes

Cities in Jasper County, IL
Hidalgo
Newton
Sainte Marie
West Liberty
Wheeler
Willow Hill
Yale

Cities in Jefferson County, IL
Belle Rive
Bluford
Bonnie
Dix
Ina
Mount Vernon
Nason
Opdyke
Scheller
Texico
Waltonville
Woodlawn

Cities in Jersey County, IL
Dow
Elsah
Fidelity
Fieldon
Grafton
Jerseyville
Medora

Cities in Johnson County, IL
Belknap
Boles
Buncombe
Cypress
Goreville
Grantsburg
New Burnside
Ozark
Simpson
Vienna

Cities in Lawrence County, IL
Bridgeport
Lawrenceville
Saint Francisville
Sumner

Cities in Logan County, IL
Atlanta
Beason
Chestnut
Cornland
Elkhart
Emden
Hartsburg
Lake Fork
Latham
Lawndale
Lincoln
Middletown
Mount Pulaski
New Holland

Cities in Macon County, IL
Argenta
Blue Mound
Boody
Decatur
Elwin
Forsyth
Harristown
Macon
Maroa
Mt Zion
Niantic
Oreana
Warrensburg

Cities in Macoupin County, IL
Benld
Brighton
Bunker Hill
Carlinville
Chesterfield
Eagarville
Gillespie
Girard
Hettick
Modesto
Mount Olive
Nilwood
Palmyra
Piasa
Sawyerville
Scottville
Shipman
Staunton
Virden
Wilsonville

Cities in Madison County, IL
Alhambra
Alton
Bethalto
Collinsville
Cottage Hills
Dorsey
East Alton
Edwardsville
Glen Carbon
Godfrey
Granite City
Hamel
Hartford
Highland
Livingston
Madison
Marine
Maryville
Moro
New Douglas
Roxana
Saint Jacob
South Roxana
Troy
Venice
Wood River
Worden

Cities in Marion County, IL
Alma
Centralia
Iuka
Kell
Kinmundy
Odin
Patoka
Salem
Sandoval
Vernon
Walnut Hill

Cities in Massac County, IL
Brookport
Joppa
Metropolis

Cities in Menard County, IL
Athens
Greenview
Oakford
Petersburg
Tallula

Cities in Monroe County, IL
Columbia
Fults
Hecker
Maeystown
Renault
Valmeyer
Waterloo

Cities in Montgomery County, IL
Butler
Coffeen
Donnellson
Farmersville
Fillmore
Harvel
Hillsboro
Irving
Litchfield
Nokomis
Ohlman
Panama
Raymond
Taylor Springs
Waggoner
Walshville
Witt

Cities in Morgan County, IL
Alexander
Chapin
Concord
Franklin
Jacksonville
Literberry
Meredosia
Murrayville
Waverly
Woodson

Cities in Moultrie County, IL
Bethany
Dalton City
Gays
Lovington
Sullivan

Cities in Perry County, IL
Cutler
Du Quoin
Pinckneyville
Tamaroa
Willisville

Cities in Piatt County, IL
Bement
Cerro Gordo
Cisco
De Land
Hammond
La Place
Mansfield
Milmine
Monticello
White Heath

Cities in Pike County, IL
Barry
Baylis
Chambersburg
Griggsville

Cities in Pope County, IL
Eddyville
Golconda
Herod

Cities in Pulaski County, IL
Grand Chain
Karnak
Mound City
Mounds
Olmsted
Perks
Pulaski
Ullin
Villa Ridge

Cities in Randolph County, IL
Baldwin
Chester
Coulterville
Ellis Grove
Evansville
Menard
Modoc
Percy
Prairie Du Rocher
Red Bud
Rockwood
Sparta
Steeleville
Tilden
Walsh

Cities in Richland County, IL
Calhoun
Claremont
Dundas
Noble
Olney
Parkersburg

Cities in Saint Clair County, IL
Belleville
Caseyville
Dupo
East Carondelet
East Saint Louis
Fairview Heights
Freeburg
Lebanon
Lenzburg
Lovejoy
Marissa
Mascoutah
Millstadt
National Stock Yards
New Athens
O Fallon
Saint Libory
Scott Air Force Base
Smithton
Summerfield

Cities in Saline County, IL
Carrier Mills
Eldorado
Galatia
Harrisburg
Muddy
Raleigh
Stonefort

Cities in Sangamon County, IL
Auburn
Buffalo
Cantrall
Chatham
Dawson
Divernon
Glenarm
Illiopolis
Loami
Lowder
Mechanicsburg
New Berlin
Pawnee
Pleasant Plains
Riverton
Rochester
Sherman
Springfield
Thayer
Williamsville

Cities in Scott County, IL
Alsey
Bluffs
Manchester
Winchester

Cities in Shelby County, IL
Cowden
Findlay
Herrick
Lakewood
Mode
Oconee
Shelbyville
Sigel
Stewardson
Strasburg
Tower Hill
Windsor

Cities in Stark County, IL
Bradford
Castleton
La Fayette
Speer

Cities in Union County, IL
Alto Pass
Anna
Cobden
Dongola
Jonesboro
Millcreek
Wolf Lake

Cities in Vermilion County, IL
Allerton
Alvin
Armstrong
Bismarck
Catlin
Collison
Danville
Fairmount
Fithian
Georgetown
Henning
Hoopeston
Indianola
Muncie
Oakwood
Potomac
Rankin
Ridge Farm
Rossville
Sidell
Tilton
Westville

Cities in Wabash County, IL
Allendale
Bellmont
Keensburg
Lancaster
Mount Carmel

Cities in Washington County, IL
Addieville
Ashley
Du Bois
Hoyleton
Irvington
Nashville
Oakdale
Okawville
Radom
Richview

Cities in Wayne County, IL
Barnhill
Cisne
Fairfield
Geff
Golden Gate
Johnsonville
Keenes
Mount Erie
Rinard
Sims
Wayne City

Cities in White County, IL
Burnt Prairie
Carmi
Crossville
Emma
Enfield
Grayville
Maunie
Mill Shoals
Norris City
Springerton

Cities in Williamson County, IL
Cambria
Carterville
Colp
Creal Springs
Energy
Freeman Spur
Herrin
Hurst
Johnston City
Marion
Pittsburg

Cities in Bollinger County, MO
Gipsy
Glenallen
Leopold
Marble Hill
Patton
Sedgewickville
Sturdivant
Zalma

Cities in Butler County, MO
Broseley
Fagus
Fisk
Harviell
Neelyville
Poplar Bluff
Qulin
Rombauer

Cities in Cape Girardeau County, MO
Altenburg
Burfordville
Cape Girardeau
Daisy
Delta
Friedheim
Jackson
Millersville
Oak Ridge
Old Appleton
Whitewater

Cities in Crawford County, MO
Bourbon
Cook Sta
Cuba
Leasburg
Steelville
Wesco

Cities in Dunklin County, MO
Arbyrd
Campbell
Cardwell
Clarkton
Gibson
Holcomb
Hornersville
Kennett
Malden
Rives
Senath
Whiteoak

Cities in Franklin County, MO
Catawissa
Grubville
Lonedell
Luebbering
Pacific
Robertsville
Saint Clair
Sullivan

Cities in Iron County, MO
Annapolis
Arcadia
Belleview
Bixby
Des Arc
Ironton
Middle Brook
Viburnum
Vulcan

Cities in Jefferson County, MO
Arnold
Barnhart
Cedar Hill
Crystal City
De Soto
Dittmer
Festus
Fletcher
Herculaneum
High Ridge
Hillsboro
House Springs
Imperial
Pevely

Cities in Lincoln County, MO
Elsberry
Foley
Hawk Point
Moscow Mills
Old Monroe
Olney
Silex
Troy
Truxton
Winfield

Cities in Madison County, MO
Fredericktown
Marquand

Cities in Mississippi County, MO
Bertrand
Charleston
East Prairie

Cities in New Madrid County, MO
Morehouse

Cities in Pemiscot County, MO
Bragg City
Braggadocio
Caruthersville
Cooter

Cities in Perry County, MO
Frohna
Perryville
Uniontown

Cities in Phelps County, MO
Beulah
Duke
Edgar Springs
Jerome

Cities in Pike County, MO
Annada
Ashburn
Bowling Green
Clarksville
Eolia
Frankford
Louisiana

Cities in Saint Charles County, MO
Augusta
Defiance
Foristell
Lake Saint Louis
O Fallon
Portage Des Sioux
Saint Charles
Saint Peters
Wentzville
West Alton

Cities in Saint Francois County, MO
Bismarck
Blackwell
Bonne Terre
Doe Run
Farmington
French Village
Leadwood
Park Hills
Valles Mines

Cities in Saint Louis County, MO
Ballwin
Bridgeton
Chesterfield
Earth City
Eureka
Fenton
Florissant
Glencoe
Grover
Hazelwood
Maryland Heights
Saint Ann
Saint Louis
Valley Park
Affton
Allenton
Berkeley
Black Jack
Brentwood
Clayton
Crestwood
Creve Coeur
Des Peres
Ellisville
Ferguson
Frontenac
Jennings
Kinloch
Kirkwood
Ladue
Manchester
Maplewood
Normandy
North County
Oakville
Olivette
Overland
Richmond Heights
Rock Hill
Saint John
Sappington
Shrewsbury
Sunset Hills
Town And Country
University City
Warson Woods
Webster Groves
West County
Wildwood
Winchester
Woodson Terrace

Cities in Saint Louis City County, MO
Saint Louis

Cities in Sainte Genevieve County, MO
Bloomsdale
Saint Mary
Sainte Genevieve

Cities in Scott County, MO
Benton
Chaffee
Oran
Scott City
Sikeston

Cities in Stoddard County, MO
Advance
Bell City
Bloomfield
Puxico

Cities in Warren County, MO
Marthasville
Warrenton
Wright City

Cities in Washington County, MO
Belgrade
Cadet
Caledonia
Irondale
Mineral Point
Potosi
Richwoods

Cities in Wayne County, MO
Clubb
Greenville
Lodi
Lowndes
Mc Gee
Mill Spring
Patterson
Piedmont
Shook
Silva
Wappapello
Williamsville

Please call us at: 1-618-708-4055
GET STARTED! Schedule your FREE Inspections & Estimate.
CALL: 1-888-387-2025
Request a Quote!
Woods Pod Cast