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Old 08-30-2007, 06:37 AM   #16
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Multiple bathroom exhaust fans


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You may have more of a problem than humidity from one shower. In fact, the shower may not even be the problem.
Thank you for your answer. I think the shower contributes to my problem because most of the condensation was right over the bathroom. The farther from that place, the less water was there in the insulation.
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You most likely have a problem with high humidity in general in the house during the winter coupled along with inadequate attic ventilation and a leaky ceiling.
I don't think I have a leaky ceiling because I never have problems during summer time when there is no condensation. I have now soffit vent and ridge vent which I didn't have last winter. The only unvented area now is the craul space behind the knee wall in the attic. The rest of the attic is finished, and I cannot see if there are any problem over the ceiling. I have no idea how that craul space can be ventilated. It is insulated though.
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On the other hand, 19 feet is a fairly long run for a duct. Make sure the fan you already have is pushing air like it should. Make sure the duct is clear all the way and that whatever back draft damper is in there isn't stuck shut. You may just need to replace the current fan with a bit bigger one. It's location in the bathroom shouldn't matter much at all. I don't think fan location is your problem.
I have already purchased a better fan, and am going to replace the ridged foil pipe with a smooth pvc pipe. I am now thinking about the best way to connect the pipes, because I have two bathrooms, and thus two fans.

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Old 08-30-2007, 09:18 AM   #17
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Multiple bathroom exhaust fans


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The only unvented area now is the craul space behind the knee wall in the attic. The rest of the attic is finished, and I cannot see if there are any problem over the ceiling. I have no idea how that craul space can be ventilated. It is insulated though.
That is a problem. Somehow, you really should get it ventilated.

When I mentioned leaky ceiling I was thinking the entire attic was open. Ceilings leak air badly around can lights and other penetrations. Your bathroom ceiling is probably leaking air into the crawl space around the fan and around the light. The fan ducting probably leaks. All this allows the damp air to move into the crawl space. Along with changing out the fan and ducting make sure all penetrations in the ceiling are sealed as tightly as possible, and also make sure your duct is sealed tight.

If you get everything tight you might be able to get by without ventilating the crawl space, but ventilating is still the best route.
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Old 08-30-2007, 12:09 PM   #18
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Multiple bathroom exhaust fans


Thank you for your contribution.

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