Solutions for Pyrite Problems
Pyrite Removal
Complete removal of contaminated backfill and replacement with healthy materials to protect your concrete slab.
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A question right now?438-795-8900info@fondationsgl.ca
Eliminate Pyrite
Pyrite is a mineral present in some backfills that, in contact with water and oxygen, decomposes and swells, causing your concrete slab to heave and crack. This problem, particularly widespread in certain regions of Quebec, can cause major structural damage if left untreated. Signs of pyrite include star-shaped cracks in the slab, floor bulging, doors that no longer close, and interior wall cracks. Excavation and replacement of contaminated backfill is the only permanent solution to eliminate this problem and protect your investment.
Why Choose Gagnon Leduc
Here are the telltale signs of a pyrite problem:
Pyrite Expertise
Deep experience in treating pyrite problems in the Montreal area.
Guaranteed Compliance
Work compliant with financial assistance program requirements.
Project Management
Complete coordination of testing, excavation, disposal, and reconstruction.
Certified Materials
Exclusive use of certified backfill free of pyrite.
Benefits of Pyrite Treatment
Our pyrite elimination solution offers you:
Permanent Elimination
Complete removal of contaminated backfill to stop the process
Structural Protection
Prevention of additional damage to your slab and foundation
New and Durable Slab
New concrete slab compliant with current standards
Our Treatment Process
Assessment and Testing
Backfill testing to confirm pyrite presence and assess extent
Compensation Application
Assistance in submitting financial aid program application if eligible
Slab Demolition
Demolition and removal of existing concrete slab
Backfill Excavation
Complete excavation and disposal of contaminated backfill
Healthy Backfilling
Backfilling with certified clean stone free of pyrite
New Slab
Pouring new concrete slab with vapor barrier membrane
Why Choose Us
Pyrite Expertise
Deep experience in treating pyrite problems in the Montreal area.
Guaranteed Compliance
Work compliant with financial assistance program requirements.
Project Management
Complete coordination of testing, excavation, disposal, and reconstruction.
Certified Materials
Exclusive use of certified backfill free of pyrite.
Frequently asked questions
How do I know if my house has pyrite?
The signs: star-shaped cracks in the basement slab, a floor that bulges, doors that don't close properly and cracks in interior walls. A test of the fill under the slab confirms pyrite.
Why does pyrite make the slab swell?
Pyrite is a mineral found in some fill. In contact with water and air, it breaks down and swells, which lifts and cracks the concrete slab.
Is a swelling slab always pyrite?
Not always. Unsuitable gravel or a faulty French drain can also cause it. The fill test settles it.
I already have a pyrite test: what now?
Email us the test report and photos before the visit; we prepare the quote from that report.
How is pyrite removed?
We demolish the slab, excavate and haul away all the contaminated fill, backfill with certified pyrite-free clean stone, then pour a new concrete slab with a vapour barrier.
How much does pyrite treatment cost?
The price depends on the job; we confirm it at the visit. The estimate visit is free, with no deposit: book it online in 30 seconds.
Treat Your Pyrite Problem Now
Request your quote
A question right now?438-795-8900info@fondationsgl.ca