Floor Crack

Sinking & Settling Concrete Floor Slab Repair in Greater Louisville

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:

Is your concrete slab floor showing signs of sinking, sagging, or settling?  Or are your floors cracking or the walls separating from the floor above or the ceiling below?  Here are some signs to look out for:

Telltale Signs:

  • Interior wall cracks, commonly off the corners of interior doors.
  • Walls pulling away from adjacent walls
  • Floors dropping and separating from the walls, forming a gap between the floor and wall.
  • Cracks in the concrete floor
  • Interior walls separating from the ceiling, forming a gap between the wall and ceiling.

How to Fix It:

The installation of a slab pier system underneath your concrete slab floor may just be the solution!  These specially designed piers extend down to strong supporting soils to ensure long-term support.

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

We serve Lexington, Louisville, Covington, and many nearby areas in Kentucky.

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 Middlesboro home Large slab floor cracks in a Hebron home A floor slab separating from the wall in a Mount Washington home. A partition wall separating from the floor in a Shelbyville home.
a sinking floor leaving a large gap between the wall and floor in a Newport home The ceiling and wall separating as the wall sinks with the slab floor in a Fort Thomas home partition walls being pulled away from the foundation walls in a Erlanger home. wall cracks along a doorway in a Latonia home.

What Causes A Concrete Floor Slab To Settle?

Concrete floor settlement is often accompanied by other foundation problems in your home as well.  If this is the case, it could mean serious damage to your home.  When the soils underneath your home cannot support the weight of the concrete, this often causes floor slab settlement. 

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

If you would like a free foundation slab stabilization quote to address concrete slab floor settlement issues, call or e-mail us today!  We have fast, effective solutions for any problem.

Installing The Supportworks Slab Pier System

Supportworks Slab Pier System stabilizes the concrete floor slab in your home.  This system 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 Radcliff

Preparing for Installation

Your foundation repair experts will have already inspected your foundation and prepared a written proposal. 

After that, they will use that proposal to map out the locations where the slab piers will be installed.  A small hole is cored through your concrete slab floor at the beginning of each slab pier installation.  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

The Supportworks Slab Pier System uses a three-piece slab bracket that is assembled underneath your concrete floor to give the slab pier something to "lift".  This allows for a much smaller hole to be cored in your concrete slab. 

This larger bracket reaches across more area along your floor and creates a more even distribution of weight.


Driving foundation piers into the floor in Burlington.

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, 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 Independence.

Transfer Slab Weight To Soil

The load-bearing strata underneath your home holds the weight of the concrete slab.  The weight is transferred from the slab to the piers, and then to the strata.

The sinking movement of your floor will be permanently halted as the systems lifts your concrete slab floor upwards.  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 Frankfort home.

Inject Grout Fill

When a void is presented underneath the concrete slab, we carefully pump grout under the slab to fill in all empty spaces. 

If your floor had been sinking because of compacted soil or washout, a gap existed even before the installation and this will be filled completely with grout as well.


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

The Cleanup

Once the installation is complete, we at The Basement Doctor of Central Kentucky 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.

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 three "fixes" that we at The Basement Doctor of Central Kentucky do NOT recommend:

Jackhammering a slab floor in a Nicholasville home.

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

Concrete Slab Replacement:

To completely replace a concrete slab is disruptive, time-consuming, and expensive.  All home furnishings, floor coverings, and interior walls within the building must be removed.  Once this is complete, a crew jackhammers the existing floor into small pieces and removes them by hand.

To replace the removed floor, a new one is poured.  It could take at least two weeks for the slab to cure sufficiently, so the homeowner should allow enough time for this.

This process uses up many resources and often does not even solve the real problem.  Without addressing the solid problems that originally lead to the cracks in your concrete floor, your new floor may "break" over time too!

Mudjacking a damaged foundation floor in a Florence home.

A grout mixture being injected underneath a concrete slab floor during a mudjacking repair in Richmond. The previous floor had sunk during settlement, detaching from the foundation walls.

Mudjacking:

Mudjacking is not a permanent solution.  It strives to fill the void under your floor to stabilize any damage by drilling a series of holes through your concrete floor and then pumping high-pressure grout beneath the slab.

This process may fill the current voids, but the soil below will continue to settle.  Additionally, it's likely that the grout alone will not be able to lift heavy partition walls that sit on top of the slab floor upwards to their original, level position.  Even if the mudjacking does lift the slab, the slab might not lift evenly.

Along with these conditions, the process of injecting this grout underneath the slab is quite messy.  In many cases, it will spew out of other holes and cracks within the slab.

Be cautious when choosing mudjacking- you may be calling your contractor all too soon to mudjack again... and again, and again, and again.

smoothing out the grout in a slab releveling project in Florence

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:

All floor coverings must be removed that were on the slab to begin this process.  After that, the floor is prepared so that the grout will be able to bond with the slab surface.

Once the floor is ready, a self-leveling grout is poured along the slab surface.  This grout will fill in the low portion of the floor to create a level surface.  This releveling must be allowed to cure for several days before the floor covering can be replaced. 

Even after the process is complete there are still cases in which the grout may not bond well to the concrete surface of the original floor slab.  If this is the case, it may lead to large chunks of the new floor breaking off over time.

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 KY?

At The Basement Doctor of Central Kentucky, we provide proven solutions for concrete slab floor leveling -- as well as other foundation repair solutions -- to homeowners throughout Kentucky. 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 Louisville, Lexington, Covington, and nearby areas such as Richmond, Ft Mitchell, Florence, Georgetown, Elizabethtown, Frankfort, Nicholasville.

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 Shepherdsville

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 Shepherdsville

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our service area

We serve the following areas

  • Adams
  • Argillite
  • Ashland
  • Beauty
  • Belcher
  • Belfry
  • Boons Camp
  • Canada
  • Catlettsburg
  • Debord
  • Denton
  • Elkhorn City
  • Fedscreek
  • Flatwoods
  • Forest Hills
  • Freeburn
  • Hardy
  • Huddy
  • Inez
  • Kimper
  • Lick Creek
  • Louisa
  • Lovely
  • Lowmansville
  • Majestic
  • Mc Andrews
  • Mc Carr
  • Mouthcard
  • Phelps
  • Phyllis
  • Pikeville
  • Pilgrim
  • Pinsonfork
  • Raccoon
  • Ransom
  • Regina
  • River
  • Rush
  • Russell
  • Shelbiana
  • Sidney
  • South Williamson
  • Steele
  • Stone
  • Stopover
  • Tomahawk
  • Ulysses
  • Varney
  • Warfield
  • Worthington
Our Locations:

The Basement Doctor of Central Kentucky
22 Reilly Rd
Frankfort, KY 40601
1-859-795-5068
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