Black mold harmless cosmetic mold from building materials when constructed?

I found what appears to be black mold isolated to the bottom of a couple of floor joist. In that same area/corner of the house there seemed to be a lot of efflorescence. The efflorescence was widespread. Would that be a coincidence or could it be something worth having a mold inspector take a look at? Didn’t find any water in the crawl space at all after heavy rain last night.

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Both conditions require moisture, or high humidity, coupled with poor ventilation.

Now explain what “black mold” is supposed to mean…

Dom.

he said he’s not a mold inspector, Dom.

Steve, if you’re not qualified to test/inspect mold, don’t try. Call it for inspection by a mold inspector.

Steve, Be careful with your wording. Black mold refers to a rare very dangerous species, not the color. Calling our black mold in an inspection report could get you in trouble. You can call it mold or bio-growth, but black mold sounds like you’ve identified the species, and you have not, because a lab didn’t look at it.

I’ve always referred to it as organic growth and recommended the client to get a mold inspection for health and safety reasons.