Causes & repair solutions for cracked, sinking concrete floors
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
Two options for repairing sinking concrete slabs:
- Install a slab pier system that connects the slab to stable soil or bedrock. Once installed, the system makes it possible to re-level settled slab sections.
- Raise settled concrete using PolyRenewal™ expanding foam. Injecting this high-density foam beneath the slab will fill voids and consolidate weak soil while also raising settled slabs back to their original position. Learn more about concrete leveling and what makes PolyRenewal™ an effective concrete repair solution.
Before and After: PolyRenewal™ used to raise floor slab
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:
Drying/Shrinking Of Soils Under The Slab
Washout Of Soil Underneath The Slab
Poor Compaction Of Foundation Fill Soils
Installing The Slab Pier System
The 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:
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.
To give the slab pier something to “lift,” a slab bracket is positioned beneath the concrete slab.
The 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.
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, we have slab piers available that are designed using galvanized steel. This ensures the quality and long-lasting strength of your slab pier system.
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.
Once the concrete slab has been lifted, a void will be present underneath the removed 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.
At Complete Basement Systems, 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 you have a 25-year warranty on manufacturer’s defects, as well as a performance warranty from us.
Foundation Slab & Floor Crack Repair Experts
If you have a crack in a concrete slab or your foundation floor, Complete Basement Systems is here to help. Our foundation repair solutions can help restore and level your concrete surfaces. Contact us online to get a free estimate in Denver, Colorado Springs, Aurora, Fort Collins, Thornton, Arvada, Westminster, Littleton, Cheyenne, Lakewood and the surrounding areas.