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Not true. Mold spores are everywhere, just waiting for a bit of dampness.

A lot of mold scare is sheer hype, however. I lived in extreme mold in my parents' lower level for years. It was under...

You shouldn't have to lift a finger nor spend a dime. The upstairs owner should pay for all of it, or be sued.
https://www.grainger.com/content/qt-types-of-moisture-meters-346. Maybe Home Depot...