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Old 07-10-2015, 11:48 AM   #1
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Bathroom roof vent


I have a slight leak, only in very heavy rains, from my bathroom ceiling fan. I've looked up at the vent pipe sticking through the roof and noted that it has no vent cap or downward turn. There are no leaks in the attic, so I'm assuming that heavy rain results in water making its way down to the fan and into the bathroom. Should I install a cap of some type that limits water entry, or just add to 90 degree elbows so that the opening points downward?

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Old 07-10-2015, 12:46 PM   #2
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I'm wondering if the vent pipe sticking through the roof sounds like a plumbing vent not a fan vent. Is it a "tube" made of PVC or cast iron?

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Old 07-10-2015, 12:48 PM   #3
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how about a picture?
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Old 07-10-2015, 01:15 PM   #4
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PVC tube, when I looked in from the attic, it looked like it was coming up from the fan. Where else would the fan vent?
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Old 07-10-2015, 01:33 PM   #5
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a fan could vent horizontally to an exterior wall with the duct work laying on or under some insulation. If it didn't vent outside at all it wouldn't be the first time that happened. But venting a fan with PVC straight up is not normal.
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Old 07-10-2015, 01:39 PM   #6
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Its a two family house, and I think it was built pretty cheaply, so nothing would surprise me too much. I'll double check to make sure that fan vent is going straight out. Assuming it is coming straight up out of the roof, ok to put U in it to keep water out, should cause any problems with the air flow I would think?
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Old 07-10-2015, 01:48 PM   #7
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If its actually venting your fan then put a u in it. But if its venting your plumbing I differ to a plumber on the wisdom of a 'U"
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Old 07-10-2015, 01:50 PM   #8
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Thanks Craig, will do. Probably easier just to get up on there with the fan running and see what comes out. Much appreciated.
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Old 07-10-2015, 02:17 PM   #9
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Old 07-12-2015, 08:26 AM   #10
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Popular destination is soffit vent. This is not good.

The fan part can be removed. The with light and mirror, you can tell the general direction of the vent.

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