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.
- Cracks in the concrete floor
- Floors dropping and separating from the walls forming a gap between the floor and wall
- Interior walls separating from the ceiling forming a gap between the wall and ceiling
- Walls pulling away from adjacent walls
- Interior wall cracks commonly off the corners of interior doors
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 Charleston, Columbia, Florence, Myrtle Beach, throughout South Carolina & over the state lines.
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.
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:
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.
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.
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.
Installing a Slab Pier System
Mount Valley stabilizes the concrete floor slab in your home. It provides the best opportunity to re-level 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:
1. 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.
2. Position Slab Bracket
To give the slab pier something to “lift,” a slab bracket is positioned beneath the concrete slab. Our 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.
3. Install Steel Piers
Steel piers are hydraulically driven down through the bracket to the competent soils beneath.
These steel piers are the real strength of the foundation pier system — and are responsible for transferring the home weight to strong supporting soils.
To prevent corrosion, Mount Valley has slab piers available that are designed using galvanized steel. This ensures the quality and long-lasting strength of your slab pier system.
4. 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.
5. Fill with Grout
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.
6. The Cleanup
At Mount Valley Foundation Services, 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
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!
A grout mixture being injected underneath a concrete slab floor during a mud-jacking repair in Spartanburg. The previous floor had sunk during settlement, detaching from the foundation walls.
Mudjacking attempts to fill the void under your floor to stabilize the damage. To do so, a series of holes are drilled throughout your concrete floor, and a high-pressure grout is pumped beneath the slab.
The process of injecting this grout underneath the slab is messy! In many cases, it will spew out of other holes and cracks within the slab.
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 position. If mudjacking does lift the slab, there’s no guarantee that the slab will lift evenly.
Most importantly, however, is that this solution is not a permanent one. Even with the current voids filled in, the soil below will continue to settle beneath the slab. All too soon, you’ll be calling your contractor to mudjack again… and again, and again, and again.
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!
Contact Us for Floor Crack Repair Solutions in Charleston, Columbia, Myrtle Beach & All of South Carolina
At Mount Valley Foundation Services, we provide proven solutions for concrete slab floor lifting — as well as other foundation repair solutions — to homeowners throughout South Carolina, North Carolina, and Georgia. 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 Augusta, Greenville, all of South Carolina, in nearby areas such as Spartanburg, Charleston, Anderson, Rock Hill, Florence, Sumter, Myrtle Beach.