Frequently Asked Questions

Yes, “black mold” (Stachybotrys chartarum) can produce mycotoxins that may cause respiratory issues, allergies, and other health problems—especially in children, seniors, and people with weakened immune systems.

Most home insurance policies cover sudden water damage (e.g. burst pipes or appliance leaks), but not gradual damage or flooding caused by poor maintenance. We work directly with your insurance provider and assist with claims documentation.

Small areas (<10 sq ft) can often be handled with proper DIY precautions. Larger infestations, hidden mold, or black mold should always be handled by certified professionals

Air quality tests start at $350–$550; surface/swab tests $150–$300 each. A full home inspection with lab analysis typically ranges $500–$1,200 depending on house size.

Most residential jobs are completed in 1–5 days. Larger or hidden infestations behind walls may take 1–2 weeks.

It depends on the cause. Sudden water damage (e.g., burst pipe) is usually covered; gradual leaks or lack of maintenance are typically not.

Yes, MoldAssist provides emergency and same-day inspections in most major Canadian cities when available.

Not if the moisture source is fully fixed. We provide a warranty (usually 1–5 years) and free follow-up air tests in most cases.

No. Many black molds are harmless. Only lab testing can confirm if it’s toxic Stachybotrys or another species.

Yes—mold thrives in cold, damp areas like basements, attics, and crawl spaces with poor ventilation.

Within 24–48 hours. Mold can double in size every 24–48 hours under the right conditions.

Yes, post-remediation clearance testing (air and/or surface samples) is included with every full remediation job.

Yes—all MoldAssist technicians are IICRC, NORMI, or MICRO-certified and follow Canadian Construction Association guidelines.

Yes, we offer full duct cleaning and disinfection using NADCA standards.

Ozone kills surface mold but does not remove it and can be harmful to breathe. We do not recommend or use ozone generators.

Yes—pets can develop respiratory issues, skin irritation, and other symptoms from mold exposure.

Average costs in the GTA (2025 pricing):

• Small attic (<800 sq ft, surface mold only): $2,800–$4,800
• Medium (800–1,500 sq ft + insulation replacement): $4,800–$8,700
• Large or structural damage: $9,000–$18,000+ Exact price depends on attic size, contamination level, and required ventilation upgrades

Most Toronto-area attic jobs are completed in 2–5 days. Simple surface cleaning can be 1–2 days; full insulation removal + ventilation upgrades usually takes 4–5 days.

• Ensure proper roof and soffit ventilation (minimum 1:300 vent ratio)
• Keep bathroom exhaust fans vented to the outside, not the attic
• Maintain consistent attic temperature with adequate insulation (R-60 in Toronto)
• Fix roof leaks immediately
• Schedule a yearly attic inspection after heavy winters

1. Free inspection & moisture assessment
2. Containment with plastic sheeting & negative air machines
3. HEPA vacuuming and wire-brushing of rafters
4. Removal of heavily contaminated insulation/wood (if needed)
5. Application of antimicrobial treatment
6. Improve ventilation (add vents, ridge vent, soffit upgrades)
7. New insulation (often blown-in R-60 for Toronto code)
8. Final air clearance testing & warranty issuance

Control humidity below 50%, fix leaks immediately, use exhaust fans, ensure proper ventilation, and schedule annual inspections in high-risk areas.

Attic work is dangerous (steep roofs, confined spaces), mold spores spread easily if disturbed incorrectly, and simply cleaning visible mold doesn’t fix the root cause. Certified pros safely contain the area, remove contaminated materials, and correct ventilation/moisture issues so it doesn’t return.

Call us toll-free at 1-888-665-3443 or fill out the contact form on moldassist.ca.