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Old 03-21-2010, 10:16 AM   #1
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Venting Bathrooms out the soffits?


I currently have two bathrooms combining and venting through the roof. This is leaky and goes through many 90s to do this.

I was wondering if I can vent it out the soffit instead?

Basically I have a one story house and the vent would have to be cut into the 2x6 at the soffit. I'd put a appliance vent with a flap and grate to direct the air downwards..

This would prevent the several 90s and it would prevent the chance for the flashing to leak around the roof.

Is it OK to vent a bathroom out a soffit? I don't see this done very often, I see them vented out the side of houses, but I don't notice it venting out the soffit. Is there some code that doesn't like moisture pooling in that space or whatever?

Please see my quick illustration for an example of what I'm talking about.


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Old 03-21-2010, 05:54 PM   #2
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Venting Bathrooms out the soffits?


In my area code allows it to be vented out the soffits.

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Old 03-21-2010, 06:41 PM   #3
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Venting Bathrooms out the soffits?


The only issue with the soffit is if there are soffit vents there for the roof
Then the moisture can be pulled up into that area & cause problems
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Old 03-22-2010, 04:13 PM   #4
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Venting Bathrooms out the soffits?


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Originally Posted by Scuba_Dave View Post
The only issue with the soffit is if there are soffit vents there for the roof
Then the moisture can be pulled up into that area & cause problems

So would you suggest I not do this?
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Old 03-22-2010, 05:06 PM   #5
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Venting Bathrooms out the soffits?


Like Dave said, if you have soffit vents, some of the moisture will end up back in your attic. Ask This Old House did a piece on that very topic. Lots of mold and rot on the underside of the roofing from this very issue.

When you say your current set up is very leaky, do you mean water leaks on the roof, or the venting is leaking moist air into the attic?

I would say all the homes in my area are vented through the roof. I know of very few people who have problems with a leaky roof where these vents are installed. So yes, it can be an issue, but if done properly, it usually isn't.
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Old 03-22-2010, 05:15 PM   #6
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Venting Bathrooms out the soffits?


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So would you suggest I not do this?
If you have soffit vents in this area I would not do it
If it was just a bathroom with a toilet - no problem
But once you add moisture from a shower not a good idea

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