Commercial mold inspection, documented room by room

Commercial mold inspections, explained

What usually prompts a commercial inspection

• Occupant complaints. Odors, stuffy rooms or a cluster of people in one area who say the air bothers them.
• A water event. A roof leak, a burst pipe, a sprinkler discharge or a backed-up drain, especially one that sat over a weekend.
• Visible growth. Stained ceiling tiles, mold on window frames or supply diffusers, or growth found during a renovation.
• Transactions. Due diligence before buying, leasing or refinancing a property.
• Disputes. A tenant claim, an insurance claim or litigation that needs an independent record.

Building a sampling plan

In a house, sampling a few rooms and the outdoors is often enough. In a commercial building, results are only useful if the samples are chosen to answer a specific question. We build the plan around three kinds of locations. Complaint areas are the rooms or suites where the problem was reported. Comparison areas are similar spaces in the same building with no complaints, ideally on a different air handler. Outdoor controls are taken near the building and, where it matters, near the outdoor air intakes.

Organizing samples by air handler zone is what makes the results readable. If the complaint area and its comparison area are on the same unit and both read high, the source may be in the system or somewhere it draws from. If only the complaint area reads high, the source is more likely local: a wet wall, a leaking window or a plenum above the ceiling.

The HVAC system in commercial buildings

Commercial air systems move large volumes of air and often run long hours. Cooling coils and drain pans stay wet through the cooling season, and a pan that doesn’t drain can grow mold right where the air is conditioned. Some duct systems use internal fibrous lining, which can hold dust and moisture and is hard to clean once contaminated. Outdoor air intakes placed near dumpsters, landscaping or standing water can pull in more than fresh air. We inspect what’s accessible and note what isn’t, so the owner knows where the limits of the inspection are.

Documentation that holds up

Commercial reports get read by people who weren’t there: property owners, tenants, insurance adjusters, lenders and sometimes attorneys. That changes how the work is recorded. Every sample location is marked on a floor plan, every moisture reading is logged with a photo, every sample travels with chain-of-custody paperwork, and the original lab reports are attached rather than summarized. Conclusions are tied to the evidence behind them. Attorneys bring us into legal cases involving mold and mycotoxins, and our expert witness page describes that work.

Communicating with occupants

How findings are shared with tenants, staff or families is the owner’s decision, but it helps to plan it before results arrive. Clear, factual updates tend to work better than silence. We can prepare a plain-language summary of the findings and the plan for the owner to share, and we keep our own communication about a building limited to what the owner authorizes.

When the inspection points to cleanup, the report becomes the basis for a remediation scope. See commercial mold remediation for how that work is contained and phased in occupied buildings, and commercial mold remediation in the Midwest for projects near our Avon, Indiana office.