Wonderful additions to the discussion! Indeed, many inspectors do lean way too much on very limited instruction (e.g. one day classes) that get them in trouble. It is very difficult to help HIs realize that this is not like measuring 4.0 piC/L.

Even more difficult is articulating what a "normal fungal ecology" may mean. What we teach is that visual observations, testing, sampling, diagnostic imagery, etc. are all points of data, but none are conclusive independently. The IAQ concerns when mold is involved does demand some interpretation that simply is not taught in a few hours.

One of my recent favorites is that a "bad" indoor spore count must be at least 10:1 over the outdoor....simply not true. When in fact, lower spore counts present may be of concern.

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S. Todd Stevens
www.buildingspecs.com