Mold Investigation Case Study

Investigation Background

A property manager in Coral Springs contacted Home Enviro after a tenant reported persistent respiratory symptoms and a musty odor in a second-floor condominium unit. The unit had been occupied for approximately 14 months. The tenant reported that symptoms improved substantially on days spent outside the unit and worsened each evening upon returning home.

The property manager had conducted a visual walkthrough and found no visible mold. The HVAC filter had been recently replaced. There were no active plumbing leaks visible in any bathroom or kitchen. Based on these findings, the property manager was uncertain whether a mold problem actually existed.

Phase One: Visual Inspection and Moisture Mapping

The licensed inspector began with a systematic visual inspection of the entire unit, paying particular attention to areas around plumbing fixtures, the HVAC system, exterior walls, windows, and the bathroom ceilings. While no surface mold was immediately visible, thermal imaging of the master bedroom's exterior wall revealed a distinct cold anomaly along the lower two feet of the east-facing wall, consistent with moisture intrusion from the exterior.

Moisture meter readings confirmed elevated moisture levels in that wall assembly. A secondary reading on the wall shared with the master bathroom also showed slightly elevated readings, suggesting moisture may have been migrating from one wet zone to another.

Phase Two: Air Quality Sampling

Spore trap samples were collected from the master bedroom, living area, and kitchen, with an outdoor control sample collected from the balcony. Laboratory analysis revealed significantly elevated Penicillium/Aspergillus spore counts in the master bedroom compared to the outdoor control. These counts were consistent with active mold growth within the wall cavity rather than simply elevated outdoor spores being tracked inside.

Findings and Report

The inspection report concluded that concealed mold growth was present inside the east-facing exterior wall of the master bedroom, most likely the result of a slow moisture intrusion at the window frame or a breach in the exterior stucco system. The findings were consistent with the tenant's reported symptoms and timing.

The report was provided to the property manager, the building association, and the tenant. It was used to scope a targeted mold remediation project and the exterior moisture source was repaired by a waterproofing contractor before remediation began.

Key Takeaways

This case illustrates why visible inspection alone is insufficient to rule out mold in a property. Thermal imaging and moisture mapping are essential tools that reveal what human eyes cannot. Air quality sampling provides objective data that supports or contradicts the presence of active mold growth in concealed spaces. Home Enviro is an inspection only firm serving South Florida. Florida mold assessor license MRSA675. Call (954) 994-8847.