Sinking & Settling Concrete Slab Foundation Repair in the Province of Quebec
Causes & repair solutions for cracked, sinking concrete floors
Concrete slab piers can extend deep below the floor to reach competent supporting soils and permanently stabilize the floor.
Do you have a concrete slab floor that is showing signs of sinking, sagging, or settling? Are the walls separating from the floor below or ceiling above?
If you have a problem like this in your home, you could have a sinking or settling concrete floor slab. This problem can lead to cracks in floors and walls, uneven surfaces, and a weakened foundation.
Luckily, the foundation repair experts at Systèmes Sous-sol Québec can help you solve this problem permanently! We provide complete foundation repair solutions in Quebec City, Montreal, Laval and nearby areas in Quebec. Call us today to get a free estimate.
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.
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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:
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Drying/Shrinking Of Soils Under The Slab
Washout Of Soil Underneath The Slab
Poor Compaction Of Foundation Fill Soils
Installing The Supportworks Slab Pier System
We use foundation piers to stabilize the concrete floor slab in your home. This method 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:
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.
Position Slab Bracket
To give the slab pier something to "lift," a slab bracket is positioned beneath the concrete slab.
The 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.
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, Systèmes Sous-sol Québec has slab piers available that are designed using galvanized steel. This ensures the quality and long-lasting strength of your slab pier system.
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.
Inject Grout Fill
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 Systèmes Sous-sol Québec, 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.
Looking For Foundation Slab Repair Contractors In QC?
At Systèmes Sous-sol Québec, we provide proven solutions for concrete slab floor leveling -- as well as other foundation repair solutions -- to homeowners throughout Quebec. 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!
We proudly offer all our foundation repair services in Laval, Quebec City, Montreal, Levis, Sherbrooke, Gatineau, Longueuil, Trois-Rivieres, Saint-Jean-sur-Richelieu, Terre-bonne and throughout the surrounding areas.
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.
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.
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.
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