Moisture is the controllable factor
Spores and organic material are present in almost every building. Moisture is the variable that determines whether growth occurs.
Where growth begins
Paper facing on drywall, untreated wood, insulation and stored cardboard support growth quickly once they stay damp.
- Below-grade areas with limited ventilation
- Wall cavities behind vapour barrier
- Under-floor and crawl space assemblies
Why removal alone is not enough
If the moisture source and humidity conditions remain unchanged, growth returns after remediation. Correcting conditions is part of the work, not an afterthought.