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Black mold around half bathroom exhaust fan.

Asked August 16, 2016 by a homeowner in Handyman (Marcia Murphy)

We had a new roof put on our home about 6 weeks ago. I am wondering if this could be related in any way. I recently noticed black mold around the exhaust fan. This is a half bath on the main floor and there is a bedroom directly above it. I removed the cover to the exhaust fan and cleaned it all up. I was able to move the motor just enough to feel inside and noticed that it is pretty wet inside the ceiling. There was the attachment to the exhaust and also a coil like tube (like what I have connected to my laundry room dryer. It seemed like the water could be coming from that. I don't know if this is an issue form the new roof somehow or if I need a Plummer, an electrician or someone that works on Air conditioning. Any ideas?

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    VNOC Handy ServicesContractorAugust 28, 2026

    It sounds like you might be dealing with a ventilation issue rather than a problem directly related to your new roof. The moisture inside the ceiling could be due to improper ventilation from the exhaust fan, which is essential for removing humidity from the bathroom. If the fan is not vented properly to the outside, it can lead to condensation and mold growth.

    First, check if the exhaust fan is properly connected to a vent that leads outside. If it's venting into an attic or another space, that could cause moisture buildup. The coil-like tube you mentioned might be part of a dryer vent, which should also lead outside.

    Since you have mold and moisture concerns, it's best to consult a licensed contractor who specializes in HVAC or ventilation systems to assess the situation. They can ensure that the exhaust fan is properly installed and vented.

    In terms of cost, hiring a licensed HVAC contractor typically ranges from $75 to $150 per hour, depending on your location.

    As a next step, I recommend getting 2-3 local quotes on Handyman.com to have a professional evaluate the issue and provide a solution.

    — Assisted answer

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