Agent

What’s with this funky bathroom soot?

If black mold, take action immediately

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DEAR BARRY: Our laundry is located on the second floor, directly adjacent to the bathroom. Whenever I run the dryer, the bathroom becomes very humid if the door is shut. I've also noticed something like black soot on the bathroom walls. I wash it off, but it always comes back. What could be causing the humidity and the soot, and what can I do to resolve this? --Debbie DEAR DEBBIE: Here are two possibilities: The vent duct for the clothes dryer may be connected to the bathroom vent duct in the attic. This would allow steam from the clothes dryer to enter the bathroom through the ceiling vent. Another possibility is that the dryer vent duct is disconnected inside the wall or ceiling of the bathroom. This would cause the moisture from your clothes to vent into the wall or ceiling cavities, raising the humidity in that room. Another concern is that the "soot" on the walls could actually be black mold, caused by the excessive moisture condition. If so, this would rai...