Solutions for Pyrite Problems

Élimination de pyrite

Complete removal of contaminated backfill and replacement with healthy materials to protect your concrete slab.

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