Quote:
Originally Posted by retiredguy123
One other point is that, if the bathroom exhaust duct is a long run, then the exhaust fan may not be strong enough to push the damp air to the end of the duct. In that case, all of the moisture from the bathroom will stay in the duct and run to the low point. This problem could be worse when it rains because of the increase in humidity in the attic.
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The bathroom exhaust runs are very long. They go from near the front of the home all the to the back and up near the roof vents. The master run is just hanging in space a few feet below the vent. The guest run goes up into the vent. I suspect the master one once did but broke loose at some point. While the master exhaust run does have a low point (and a taped up junction between two sections of duct) right above the laundry ceiling, the oven vent pipe is also in the same area. As best as I can tell, the dryer vent is nearby but a bit too far away from the area in question to be responsible. We'll see what the roofer says on Wednesday but at this point, unless he finds something obvious, I'm thinking of floating the idea of replacing the gooseneck vents for the oven vent and also the dryer vent just in case (maybe changing the angle as well as others have recommended). Plus, as we're expecting a lot of rain today, I might go up in the attic again and sit there watching for drips (now that sounds like fun, eh?). One thing complicating all this is that there's a foot or more of blown-in insulation covering everything up there.
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bc