Mold Removal & Remediation in Brockville
Riverside humidity along the St. Lawrence and older housing stock in the historic core both feed mold in Brockville — we find where moisture is actually getting in before we start remediation.
Brockville grows mold in very particular places: the under-ventilated attics of its thousands of post-war bungalows, the finished basements of the historic core along the St. Lawrence and the older east-end streets, and the duplexed rentals where two households' worth of showers and cooking push humidity into spaces never built for it. Knowing where to look matters — and removing the mold without fixing the moisture just books a rematch.
Our Mold Removal Services
Professional mold removal services for homeowners across Brockville.
Mold Inspection
Moisture readings and a borescope inspection, accounting for Brockville's proximity to the river and the older foundation types downtown.
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Mold Remediation
Sealed containment and HEPA filtration for safe removal, whether it's a historic-core property or an east-end rental.
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Air Quality Testing
Pre- and post-remediation air testing so you have real numbers before anyone moves back in.
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Moisture Control
Grading, ventilation and humidity fixes tailored to riverside conditions, so the mold doesn't just come back with the next thaw.
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Where Mold Grows in Brockville Homes
Post-war bungalow attics. Drive any street in the older suburbs between downtown Brockville and Waterloo and you're looking at 1950s–60s bungalows built with a few gable vents, thin insulation, and no thought to air sealing. All winter, warm humid air from the house leaks up through pot lights, attic hatches and top plates, hits the cold sheathing, and condenses. In a hard January cold snap it builds as frost; when a thaw comes, it melts — homeowners call us about "roof leaks" in -15°C weather that are actually attic rain. By the time the black staining on the sheathing is visible, the pattern has usually been repeating for years. Attic remediation here means cleaning or treating the sheathing, but just as importantly air-sealing the ceiling plane and correcting ventilation so the cycle stops.
Finished basements in the historic core along the St. Lawrence and the older east-end streets. Brockville’s 1960s–80s neighbourhoods are full of basements finished decades ago — carpet on concrete, vapour barriers in the wrong place, wood strapping tight to foundation walls. Concrete wicks ground moisture year-round, and summer humidity condenses on cool below-grade walls behind the finishes. The mold grows hidden on the back of drywall and under carpet, and often announces itself only as a musty smell or allergy symptoms that ease when you leave the house. We inspect with moisture meters and borescopes before cutting, so demolition is surgical rather than wholesale.
Duplexed homes and student rentals. Brockville's rental market has converted many single-family basements into apartments, and rental demand keeps them full. Extra occupants mean extra showers, cooking and drying laundry — often in basement suites with one small bathroom fan and windows that stay shut. The results are predictable: condensation mold on cold corners, closets and window frames. For landlords we pair remediation with practical ventilation fixes and humidity guidance, because a re-occurrence complaint six months later helps nobody.
Our approach: inspect, test, remediate, verify. We start by finding the moisture source and mapping the growth — visual inspection, moisture readings, and air or surface sampling when it adds real information (we'll tell you when it doesn't). Remediation follows containment protocols: sealed work areas under negative pressure, HEPA filtration, removal of unsalvageable materials, and HEPA vacuuming and damp-wiping of everything that stays. Then we verify the result and hand you a clear record — useful for landlords, real-estate transactions, and your own peace of mind.
Serving Brockville & Surrounding Areas
- Brockville
- Gananoque
- Prescott
- Athens
- Mallorytown
According to Statistics Canada's Households and the Environment Survey, 13% of Canadian households have reported mould or mildew in their home (source). Health Canada considers indoor mould growth a significant health hazard and recommends keeping indoor humidity between 30–50% — see also CMHC's guidance on mould in housing.
How We Work
Most Brockville mold calls fall into three groups: century homes near downtown and the river with stone foundations, post-war houses with under-ventilated attics, and finished basements that smell musty every summer. We inspect for the moisture source first and give you a written scope and price before any work begins.
Inspection, testing, removal — in that order. Moisture readings and a visual inspection tell us where the problem is. Air or surface sampling is added when it will change the plan. Removal is done under containment and negative air, colonized materials are bagged out, surfaces are HEPA-cleaned, and the moisture cause is corrected.
St. Lawrence humidity is part of the picture. Long humid summers along the river push moisture into cool basements and onto cold foundation walls behind finishes. Dehumidification and keeping finishes off damp stone are often as important as the cleanup itself.
Frequently Asked Questions
What happens during a mold inspection in Brockville?
We walk the house with moisture meters, check the usual trouble spots for its age and type (attic sheathing, basement walls behind finishes, window frames, bathrooms), use a borescope behind walls where needed, and identify the moisture source. You get a written summary and, if work is needed, a scope and price. Sampling is added only when it adds information.
How much does mold testing cost in Brockville?
Testing is included in the $300–$600 inspection when sampling is needed. Air samples compare indoor spore counts against an outdoor baseline; surface or tape samples identify what is growing on a specific stain. If growth is visible and the cause is obvious, testing often is not necessary.
Do you do air quality testing in Brockville?
Yes. Air quality testing is most useful when there is a musty smell but nothing visible, after a leak or flood, before buying an older home, or as clearance after remediation to confirm the house is back to normal.
How much does mold removal cost in Brockville?
Small contained areas under 10 sq ft are $500–$1,500, typical basement remediation $1,500–$6,000, and attic remediation with air sealing and ventilation $2,000–$8,000. A century-home basement with condensation mold and a fan upgrade can be roughly $700–$1,200. Full ranges are in the Brockville mold removal cost guide.
Why do older Brockville homes get mold in the basement?
Many of Brockville's 19th-century homes sit on limestone or rubble foundations with no exterior waterproofing. Ground moisture moves through the stone year-round, and summer humidity off the river condenses on the cool walls. When those walls are framed and drywalled tight, the moisture is trapped behind the finish and mold grows out of sight.
I have vermiculite in the attic. Is that a mold problem?
It is a separate issue — and an important one. Vermiculite insulation can contain asbestos, so leave it undisturbed and have it sampled by an accredited lab. If it is positive, removal is regulated asbestos abatement under Ontario Regulation 278/05, done by a licensed abatement contractor before any mold work in that attic.
Can I clean the mold myself?
A small patch — under about 1 square metre on a hard surface — can usually be cleaned with soapy water and dried. Bleach does not reach growth inside drywall or wood. Larger areas, anything inside walls or the attic, or mold that keeps returning should be contained and removed professionally.
Will the mold come back after it is removed?
Not if the moisture is fixed. The source is part of every scope — dehumidification, a bathroom fan, air sealing the attic, grading or a plumbing repair — and the job closes with moisture readings and optional clearance testing.
Do you cover Prescott, Gananoque and the surrounding area?
Yes — Brockville plus Prescott, Gananoque, Athens and Mallorytown. Waterfront cottages and seasonal homes closed up for winter are a common source of spring mold calls.