What to do? First, take a look in your attic. Especially if it's been a long time since you've been up there. Look above your bathrooms to see if there is a tube leading outside. If it goes to the roof, check outside to make sure there is a vent in that same location. If it goes to the soffit, make sure there is a vent through the soffit in that area. If your bathrooms are on a lower level, they may vent through the wall. In that case, turn on the vent fan, or your dryer, and look to see if air is exhausting. Most of the time, you can see the flapper moving or fully open. If it's not, you may have a problem, and I would recommend getting a licensed contractor in to help you out. And while you're at it, make sure the dryer vent line is cleaned on a regular basis. Lint builds up and is very flammable!
|Bathroom vent to attic causing delamination of the roof plywood and mold.|
|A soffit vent. Even though the soffit is vented (the perforations) |
you still need to exhaust a vent fan through the soffit.