(450) 973-1640
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We provide each client with a complete solution that protects the foundation and the entire structure of the building.
Concrete slab replacement and pyrite remediation
For pyrite remediation and concrete slab replacement on the North Shore of Montreal and surrounding areas (including the cities of Blainville and Laval), trust the Fissure 640 team, with thousands of projects completed over the past 35 years.
At Fissure 640, we follow a structured and rigorous approach. Our goal is not simply to replace the visible concrete, but to eliminate the root cause of the problem to ensure long-term stability and safety.
We hold a Régie du bâtiment license (no. 5615-4115-01) and carry out all our work in compliance with municipal standards and building code requirements.
Why do concrete slabs crack or lift?
A concrete slab can deteriorate for several reasons. Soil movement, repeated freeze and thaw cycles, water infiltration and heavy loads all place constant pressure on the surface.
In a garage, these conditions are intensified by the weight of vehicles, temperature fluctuations and the use of de-icing salts during winter.
Another common cause of cracking or lifting must also be considered: the presence of pyrite in the soil. Pyrite is a mineral that reacts chemically when exposed to moisture and oxygen.
This reaction causes expansion beneath the slab, creating upward pressure. Over time, this pressure leads to cracking and lifting of the concrete slab.
In this situation, simple resurfacing or patching is not a durable solution. A full concrete slab replacement combined with pyrite remediation becomes essential.
This involves removing the contaminated backfill containing pyrite and rebuilding a solid base to ensure long-term stability and safety.
Fissure 640
Over 35 years
Pyrite
Complete analysis
Concrete slab
Long-term stability
Signs that pyrite is present under the slab
Signs of pyrite beneath a concrete slab may include visible cracks, lifting or settling in the concrete. These issues are often localized and worsen over time.
Floors that lift, doors that no longer close properly, moldings that do not stay in place and cracking walls are clear signs of soil movement.
A professional inspection and soil analysis are required to confirm the presence of pyrite. If test results are positive, corrective action should be taken to prevent significant structural damage.
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Complete concrete slab replacement process
The replacement process begins with the complete demolition of the damaged concrete slab. This step provides access to the foundation and allows for a proper inspection of the backfill to eliminate any hidden weaknesses.
When unstable or contaminated soil is identified through laboratory analysis, removing the reactive backfill is essential to stop future expansion and prevent the slab from lifting again.
The stone affected by pyrite is removed and replaced with clean, stable material.
After removing and replacing the reactive backfill, we rebuild the base using compacted granular material (crushed stone that meets construction standards), ensuring a solid and stable foundation for the new concrete slab.
This guarantees even load distribution and long-term stability.
A reinforcement system, consisting of steel rebar or wire mesh, is then installed to strengthen the new slab and reduce the risk of cracking.
Next, high-quality concrete designed to withstand climate conditions is poured and leveled. A professional finish ensures a strong, stable and durable surface.
Pyrite remediation: a critical step
Without complete pyrite remediation, damage will continue beneath the new slab, making the replacement ineffective.
By combining pyrite remediation with concrete slab replacement, the Fissure 640 team provides a complete solution that ensures long-term stability rather than a temporary fix.
Pricing and project evaluation
The cost of concrete slab replacement typically ranges between $28 and $30 per square foot.
When pyrite remediation is required, pricing depends on the extent of contamination, excavation depth and site accessibility.
Each property is evaluated individually to provide the most appropriate solution based on the actual conditions.
FISSURE 640
Contact us
For concrete slab replacement and pyrite remediation on the North Shore of Montreal and surrounding areas (including the cities of Blainville and Laval), call us at (450) 973-1640 for an estimate.
The Fissure 640 team offers professional, thorough solutions designed to ensure the long-term structural protection of your home or business.
Certified Company
Accreditations that reflect our commitment
We meet the quality and professionalism standards expected in the industry. These certifications reinforce the trust placed in Fissure 640.
These certifications reflect our commitment to quality, transparency and safety.
Services Offered
North Shore
Laval
Montreal