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Old 02-16-2011, 05:07 PM   #1
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Bath fan venting


With regards to venting in general I have a couple questions.

1. Can I tee the bath fan exhaust into the waste vent?

2. Is it advisable (regardless of the answer to the first question) to end the waste vent at an attic ridge vent (I have soffit vents and a 'ridge' vent)? It would seem that'd allow gas to vent outside. Please say yes! You're gonna' say no aren't ya'...

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Old 02-16-2011, 05:13 PM   #2
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Bath fan venting


No to both.

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Old 02-16-2011, 05:30 PM   #3
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Bath fan venting


Thanks Jim... as I thought. OK then, how about venting the fan thru a soffit? OR, for that matter, venting both thru the same soffit? I'm just trying to keep from punching holes in the new roof... snow, ya know.
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Old 02-16-2011, 08:17 PM   #4
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Bath fan venting


No. Your wast vent has to go up through the roof. If you are looking to ad new ventillation and already have existing ventilation you should be able to branch into your existing vent which should already be up through the roof.

Venting anything through a soffit is a bad idea. They are designed to take air in and conduct it up and out the ridge vent. As if you are venting steam from your bathroom out a soffit vent it is just going to go back up into your attic. Another roof vent or a side vent is preferable.

Nothing should be blowing up into your attic or out the soffit or ridge vents.
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Old 02-16-2011, 11:37 PM   #5
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Bath fan venting


Yeah, one more thing Jim... one reason I don't want to connect the new bath vent to the old bath vent is that the old fan is connected, via a tee, to the other waste vent... ruuh ooh! NOW WHAT??
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Old 02-16-2011, 11:44 PM   #6
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Bath fan venting


Hooking a bathroom exhaust fan into a waste vent is against code. The other stuff you are talking about doing probably doesn't violate any codes. It is just not thought to be a good idea. If you can vent your bath fan into the attic, soffit or ridge vent without causing moisture damage then knock yourself out. If I did things improper in my house, I would be embarrased about it.
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Old 02-17-2011, 09:57 AM   #7
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Bath fan venting


Can you not go out the side of your house from the attic?
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Old 02-17-2011, 10:25 AM   #8
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Bath fan venting


Cannot do Andrew... the roof is mostly hipped and the only accessable gable is cathedral. The problem with venting it 'into' the 'ridge' vent is that the vent is actually in a tight area under an 'observatory' eve. I don't like the idea of the moisture getting trapped there, even though it probably wouldn't do any damage.

With regards to code, here in N. Idaho there is almost none. I'm not interested in code necessarily, only doing it right where there won't be any problems later. The one bath vent going into the waste stack has never been a problem and I did that about 15 years ago. Seemed like a good idea to me. I only learned recently that it was against code in a southern county. I may disconnect it and tie it into the new stack (not the new waste stack) with the other bath vent... or... is that also NOT a good idea?

Thanks for the comments, guys.
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Old 02-17-2011, 06:48 PM   #9
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Bath fan venting


The risk of venting a bath fan into a waste vent is that sewage gas can draft back into the bathroom. PU

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