Mould Remediation in Canada
Mould Is More Common Than You Think
Mould growth is one of the most frequently misunderstood property problems in Canada. It is not just a cosmetic issue. Untreated mould can cause significant structural damage, trigger respiratory illness, and dramatically reduce a property’s value. And because mould often grows in hidden areas, behind drywall, under flooring, inside HVAC systems, many homeowners do not realize they have a problem until it has already spread.
WINMAR®‘s certified mould remediation teams have addressed mould problems in thousands of Canadian homes and commercial buildings. We follow established industry standards and document our work thoroughly so your insurance claim and any future property transactions are supported.
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What Causes Mould to Grow?
Mould requires three things to grow: moisture, a food source (which includes wood, drywall, insulation, and many building materials), and warmth. This makes the post-water-damage period particularly high-risk, which is why our water damage restoration process is specifically designed to eliminate moisture before mould takes hold.
Common causes of mould growth in Canadian homes and buildings include:
- Unaddressed water damage from flooding, pipe leaks, or appliance failures
- Roof leaks, especially where insulation absorbs and holds moisture
- Condensation from poor ventilation, particularly in bathrooms, kitchens, and crawl spaces
- High indoor humidity, common in older homes and in regions with humid summers
- Basement moisture intrusion through foundation walls or floor cracks
- Improperly dried building materials following any water event
Mould vs. Toxic Mould: Understanding the Difference
‘Toxic mould’ is a term that gets used frequently but is often misunderstood. All moulds can potentially cause health effects, especially in individuals with allergies, asthma, or compromised immune systems. However, some species, such as Stachybotrys chartarum (commonly called black mould), are associated with greater health concerns.
The important point for homeowners: you should not attempt to determine the species of mould present in your home. The correct response to any significant mould growth is professional assessment and remediation, not surface cleaning. Surface products can temporarily reduce visible mould but do not address the mould colony within porous materials or the underlying moisture source.
A Note on Mould Treatment
Surface sprays and household cleaners treat what you can see but do not address mould roots embedded in drywall, wood, and insulation. Disturbing mould colonies without proper containment can spread spores to unaffected areas of your home. For any significant mould growth, or any mould following a water damage event, professional remediation is the appropriate response.
The WINMAR® Mould Remediation Process
WINMAR® crews offer prompt and professional service to help our customers get back to pre-loss life with the least amount of interruption and associated costs as possible:
- Initial Assessment & Moisture Mapping: Before any work begins, we identify all mould-affected areas and, critically, the moisture source feeding the growth. Without finding and addressing the source, mould will return.
- Containment: We establish physical containment barriers and create negative air pressure in the work area to prevent spore migration to unaffected parts of the building.
- Air Filtration: HEPA-filtered air scrubbers run continuously throughout the remediation process, capturing airborne mould spores.
- Mould Remediation: Affected non-salvageable materials (drywall, insulation, flooring) are carefully removed and disposed of in sealed bags. Salvageable structural materials are HEPA-vacuumed and treated.
- Cleaning & Antimicrobial Treatment: All surfaces in the remediation area are cleaned and treated with appropriate antimicrobial agents.
- Moisture Source Repair: We work with the appropriate trades to address the underlying moisture issue, whether that means coordinating plumbing repairs, improved ventilation, or waterproofing.
- Post-Remediation Verification: We conduct clearance testing to confirm that mould levels have returned to acceptable thresholds before containment is removed.
- Rebuild & Restoration: WINMAR® handles the complete rebuild of any removed materials, returning your property to pre-loss condition.
Health Effects of Mould Exposure
Health effects from mould exposure vary based on the species present, the extent of growth, the duration of exposure, and the individual’s sensitivity. Commonly reported effects include:
- Respiratory symptoms such as coughing, wheezing, and shortness of breath
- Nasal and sinus congestion
- Eye, skin, and throat irritation
- Headaches and fatigue
- Worsening of asthma and allergy symptoms
Individuals who are very young, elderly, pregnant, or immunocompromised face greater risk from mould exposure. If anyone in your household is experiencing unexplained health symptoms alongside musty odours or visible mould, we encourage you to seek medical advice from your healthcare professional and arrange for a professional property assessment.
Does Insurance Cover Mould Remediation?
Mould remediation coverage depends on your specific policy and the cause of the mould. Mould that results from a covered water damage event is generally covered under standard homeowner’s policies. Mould resulting from long-term neglect or poor maintenance may not be covered.
WINMAR® documents mould remediation projects thoroughly, with before-and-after photos, moisture readings, and detailed scopes of work, all of which support insurance claims and adjuster reviews.
Mould Prevention: What You Can Do
While professional remediation is the correct response to an active mould problem, there are practical steps Canadian homeowners can take to reduce the risk of mould developing:
- Control indoor humidity by maintaining relative humidity between 30% and 50% year-round using dehumidifiers if needed
- Ventilate kitchens and bathrooms with exhaust fans vented to the exterior
- Address any water leaks or moisture intrusion immediately
- Inspect your roof, eavestroughs, and foundation annually for signs of water intrusion
- Ensure your crawl space is properly vapour-barriered and ventilated
- After any water damage event, engage professional drying services; do not assume materials are dry
Frequently Asked Questions: Water Damage Restoration
The most obvious sign is visible mould growth, which can appear in shades of black, green, grey, or white. A persistent musty odour is another strong indicator, particularly in basements, closets, and behind walls. Unexplained health symptoms affecting household members can also signal hidden mould.
Do not disturb the mould or attempt to clean it yourself, as this can spread spores to unaffected areas of your home. Contact a professional remediation team for assessment. The sooner mould is professionally assessed and treated, the better the outcome for both your property and your household.
Professional remediation that correctly identifies and addresses the moisture source should produce lasting results. If the moisture problem is not fully resolved, mould can return, which is why WINMAR® always addresses the root cause, not just the visible mould.
Many of our locations hold IICRC (Institute of Inspection, Cleaning and Restoration Certification) and other relevant industry certifications. Certification may vary by franchise location. For additional information or clarification regarding certifications at your local WINMAR®, please contact WINMAR® Corporate Marketing.
Ready to Book a Mould Assessment?
Contact WINMAR® at winmar.ca/contact-us. Our national network means a local team is always nearby, ready to help you get back to pre-loss life.
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