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Thread: Basement Bathroom Venting

  1. #1

    Default Basement Bathroom Venting

    I am adding a basement bathroom. I know I need to add an exhaust fan for moisture expulsion, but the question is, what's the easiest way to route this to the outside? What is typical? Through the attic? Through the first floor side wall? How?

    Any help appreciated

  2. #2
    In the Trades brownizs's Avatar
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    If in the basement, vent out the wall on the side, like you would if you where venting a dryer vent.

  3. #3

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    Can I tie the bathroom's exhaust duct into the existing dryer exhaust duct? I have easy access to that pipe. Do they make one-way valves that I can place in each line so the bathroom doesn't vent into the dryer or vice versa?

  4. #4
    In the Trades brownizs's Avatar
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    Personally I wouldn't, due to the moisture if there is a shower used in the space all the time, would cause the lint to turn into a hard mass, and be a fire hazard. If it is only a toliet in the space, and the exhaust fan is for removing the smell, that could be a possibility. Personnally I would vent with a different outside vent.

  5. #5

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    How about venting through the window? My windows are the small, 12"-just-lets-in-a-little-light kind of windows. If I replace the window in the bathroom-to-be with an exhaust fan, then am I violating some kind of 'proper egress' code?

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    Don't vent it through the dryer...A window that small isn't considered an egress, so you can do pretty much what you want with it (my unprofessional opinion). You could replace it with lexan, which would allow you to make a hole and still attach the vent without things breaking. You can get it with a UV resistant coating. There'd be still some light coming in.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7

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    FYI, I decided to go through the rim joist of the first floor. I see that's how the dryer gets vented, so I'll just make another hole in similar fashion.
    Thanks for all the comments.

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