Vancouver’s wet season keeps indoor humidity high for months at a time, and that’s exactly what mold needs to establish itself out of sight. Here are the five spots we find it most often — and why a single air sample from the living room misses most of them.
1. Behind bathroom walls
Poorly vented bathrooms trap moisture in the wall cavity behind tile and drywall. You won’t see it until it bleeds through the paint, but the spores are already in the air you breathe.
2. Crawlspaces and subfloors
A vented crawlspace under a Vancouver home pulls in damp outdoor air. When that meets cooler subfloor surfaces, condensation feeds mold on joists and insulation.
3. Around window frames
Single-pane and older windows sweat in winter. That daily condensation soaks into the frame and sill, a slow, reliable mold source in bedrooms.
4. Inside the HVAC system
Ductwork and the air handler stay dark and occasionally damp — an ideal reservoir that then distributes spores to every room on each cycle.
5. Laundry and utility rooms
Warm, humid, and often under-ventilated. A dryer that isn’t vented fully outdoors dumps moisture straight into the room.
Why room-by-room testing matters
A one-sample test tells you about one room. Because mold sources are localized, we screen every room against an outdoor baseline, so you find out which spaces are actually elevated — and by how much — in a single visit.