What is pyrite and how is it detected in Fabreville?

Pyrite is a mineral (iron sulphide) found in the crushed stone backfill placed beneath basement concrete slabs. When pyrite oxidizes on contact with moisture, it swells and lifts the slab, causing cracks and deformation. In Fabreville, some 1990s homes are affected. We look for visual signs: slab heaving, star-pattern cracks, white or yellow deposits. A CTQ laboratory test can confirm the diagnosis.

Building Inspector Fabreville, Laval | Pyrite & Drainage

Housing Profile

Fabreville: from farmland
to suburbia.

Fabreville's main development occurred between the 1980s and 2000s, transforming former agricultural fields into family residential neighbourhoods. The housing stock includes two-storey homes, renovated bungalows, cottages and more recent townhouse developments. Proximity to Highways 13 and 440 makes it popular with families, but the conversion of farmland to residential use creates particular inspection challenges.

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1980s-2000s Homes

Cottages and two-storey homes with finished basements, attached or built-in garages, and mature landscaping. Mechanical systems from this period — furnaces, water heaters, air conditioners — are approaching end of life. Vinyl or brick cladding sometimes conceals underlying deficiencies.

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New Construction

Recent developments in Fabreville include detached homes, semi-detached units and townhouses. Though new, these buildings can have construction deficiencies, grading problems, and items covered by the GCR warranty that are important to identify before coverage expires.

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Pyrite Concerns

Some 1990s homes in Fabreville were built with pyrite-containing crushed stone backfill beneath the basement slab. Oxidation of this mineral causes the backfill to swell and the slab to heave — a costly problem that requires early detection.

Soil & Foundations

Former farmland beneath
Fabreville.

Fabreville was developed on agricultural land overlying the typical Laval substrate: limestone covered by Champlain Sea marine clay. The reworking of soil during residential construction, combined with the clay's nature, creates particular drainage conditions that affect foundations and basements throughout the district.

✓ Reworked soil on clay — The transformation of farmland into residential lots involved significant backfilling. Reworked soil can compact unevenly over the Champlain Sea clay, causing differential settlement of foundations.

✓ Problematic grading — Lot grading in 1990s-2000s developments is not always adequate. Surface water can be directed toward foundations rather than toward storm sewers, causing recurring infiltration.

✓ Pyrite in backfill — The crushed stone backfill placed beneath basement slabs in 1990s construction can contain pyrite. Its oxidation causes swelling that cracks and heaves the basement concrete slab.

✓ Perched water table on clay — The underlying clay retains water and creates seasonal perched water tables. This water accumulation exerts hydrostatic pressure on foundation walls and beneath slabs, especially in spring and after heavy rain.

Common Findings

What we find
in Fabreville.

Fabreville properties, whether established or new, present inspection issues specific to this district's development history.

✓ Slab heaving from pyrite — Star-pattern cracks in the basement slab, undulating floors, white or yellow deposits on concrete, basement doors that stick — possible signs of pyritic swelling beneath the slab.

✓ Grading problems — Ground sloping toward the house, water pooling near foundations, soil erosion around the building, downspouts discharging too close to walls — common grading issues in 1990s-2000s developments.

✓ New-construction deficiencies — Shrinkage cracks in new foundations, rushed interior finishing concealing defects, inadequate bathroom ventilation, missing caulking around windows — frequent findings in recently delivered homes.

✓ End-of-life mechanical systems (1980s-90s) — Gas furnaces over 25 years old, original water heaters, 1990s central air conditioners, and aging heat pumps are at or past their useful service life.

✓ Basement water infiltration — The combination of low-permeability clay soil, sometimes inadequate grading, and aging French drains makes Fabreville basements vulnerable to water infiltration, particularly in spring.

✓ Deteriorating exterior cladding — 1990s vinyl siding shows fading and brittleness. Brick veneer can present mortar joint cracking and flashing problems around windows and doors.

Neighborhoods Served

Fabreville,
in detail.

We inspect properties throughout Fabreville, including:

Fabreville West

Established 1980s neighbourhoods, spacious family homes

Fabreville East

1990s-2000s developments, cottages and townhouses

Dagenais District

Commercial and residential corridor, new builds on the periphery

Les Bois District

Quiet area, wooded lots, proximity to green spaces

Our Services

Inspections available in
Fabreville.

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Pre-Purchase Inspection

FAQ

Questions about
Fabreville.

What is pyrite and how is it detected?+

Pyrite is an iron sulphide found in crushed stone backfill beneath basement slabs. When it oxidizes, it swells and heaves the slab. We look for visual signs: heaving, star-pattern cracks, white deposits. A CTQ laboratory test can confirm the diagnosis and determine the swelling potential index.

Are new homes in Fabreville free of problems?+

No. Recent construction can have deficiencies: grading problems, shrinkage cracks, rushed finishing, inadequate ventilation. An inspection before the GCR warranty expires (1 year, 3 years or 5 years depending on coverage) is strongly recommended.

Why is drainage a concern in Fabreville?+

Fabreville was developed on former farmland where the soil was reworked. Lot grading can be inadequate, directing water toward foundations. The underlying clay retains water and creates hydrostatic pressure on foundations, especially in spring.

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