Pyrite
Demolition of finishes and the slab, then removal of the affected backfill before corrective work.
What is pyrite
Found in some backfill under basement slabs, pyrite can swell when exposed to air and moisture. The result: cracked or heaved slabs, distorted partitions, sticking doors. The fix generally means removing the backfill and replacing it with a compliant material.
- Cracked or heaved basement slabs
- Backfill under slabs
- Basement finishes and partitions
- Homes and buildings from the 1970s to the 2000s
Our role
- 01
Clean demolition of basement finishes (flooring, partitions, drywall).
- 02
Concrete slab demolition and removal of the affected backfill.
- 03
Protection of occupied areas and dust control.
- 04
Coordination with the engineer and contractor in charge of the repair.
How we work
- 01Site visit and samplingWe assess the site and identify hazardous materials.
- 02Quote within 24 hA precise scope, a clear price, a realistic schedule.
- 03Containment and workSealed area, negative pressure and code-compliant procedures.
- 04Air test and handoverHEPA cleaning, final check, space ready for what comes next.
Frequently asked questions
How is pyrite confirmed?
Through an assessment of the backfill by a laboratory or engineer. We step in once the diagnosis is made.
Do you do all the corrective work?
We handle demolition and backfill removal. Rebuilding is done by the chosen contractor, and we coordinate the schedule with them.
What are the signs of a pyrite problem?
Star-shaped cracks in the basement or garage slab, a slab that is heaving, whitish powder along the cracks, partitions that warp or doors that stick.
Can we stay in the house during the work?
The basement is not accessible during the work, which is noisy and dusty. Depending on the house, it is often possible to stay on the upper floors.
What do you do with the removed backfill?
It is hauled away and disposed of at an authorized site. Debris management is included in our quote.
Other contaminants
