MoldAct's three markets present three different moisture problems. Baltimore's brick rowhouses — most built between 1870 and 1940 on unreinforced foundations with no waterproofing membrane — see basement seepage as a near-universal condition, and the region's humid subtropical summers keep relative humidity above 70% for months at a time. In Newark and Jersey City, the same story plays out in century-old three- and four-family houses with original plumbing and unreinforced masonry. In Miami, the driver flips from ageing infrastructure to sheer climate: 70-90% relative humidity year-round means any building envelope failure or HVAC malfunction produces mold within 48-72 hours, in Art Deco-era buildings whose hollow-core block and plaster-over-lath construction hold moisture differently than modern drywall.
Because mold only grows where a water source, organic material, and warmth all converge, an inspection has to trace the moisture, not just photograph the visible growth. A licensed assessor uses moisture meters and thermal imaging to find wet material behind finishes, then collects air samples — always paired with a simultaneous outdoor sample, since an indoor spore count means nothing without that comparison point.
Surface sampling is used specifically when Stachybotrys chartarum ('black mold') is suspected, because it under-reports in air sampling — the spores are heavy and sticky, and often don't aerosolise until the material is disturbed.
The inspection concludes with a written protocol: affected areas, condition level, containment requirements, materials to remove, and clearance criteria. A remediation crew that shows up without that document — or offers to write its own — is the industry's most common red flag.
Signs you need mold inspection
- Visible discolouration or fuzzy growth on walls, ceilings, or around window frames
- A persistent musty odor, especially in a basement, crawl space, or HVAC closet
- A known past water event — a leak, flood, or slow plumbing failure — even if it was 'dried out' at the time
- Water staining, efflorescence, or bubbling paint on interior surfaces
- Allergy-type symptoms that improve when away from the property
Why Washington properties see this
In Baltimore rowhouses, inspectors look first at the basement and foundation wall line — unreinforced brick built before 1940 with no waterproofing membrane is the region's most common moisture entry point.
In Newark and Jersey City, original plumbing and unreinforced masonry foundations in century-old multi-family houses mean an inspection routinely covers both the basement and any recent plumbing history, not just the visible complaint.
In Miami — Miami Beach, Brickell, Doral — the climate itself is the variable: 70-90% humidity year-round means mold can establish within 48-72 hours of any envelope or HVAC failure, so inspections in these markets weight HVAC closets and window/balcony seals heavily.