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  1. #1
    Join Date
    Mar 2011
    Posts
    6

    Default Shower Moisture Venting Question

    Hello, I have a newly installed Shower Vent/fan that just currently just exhausts the moisture into my attic.

    My Question is, can I link the SHower Vent to an Existing VERTICAL Vent Stack? I'm imagining just cutting the Vent Stack and put in a WYE ABS fitting, connect the Shower to the WYE fitting, and the air/moisture goes out the stack.

    Is this to code/legal? Will it work?

    The reason I don't want to go Horizontal and put in a new vent tube out of a wall is because I don't have a hammer drill and bit to punch a 3" or 4" hole in my exterior wall.

    Do I just bite the bullet and go Horizontal?

    In my mind it seems easier to go Vertical using a Vent Stack.

    Thoughts?

    Thanks guys!

  2. #2
    Join Date
    Aug 2007
    Posts
    7,042

    Default Re: Shower Moisture Venting Question

    DO NOT tie your exhaust vent into any plumbing vents in the attic! Those vents are full of sewer gas that is both noxious and toxic.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  3. #3
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: Shower Moisture Venting Question

    As said, the gasses are also flammable. Under the right conditions they can explode as the fan motor will easily provide the needed spark to ignite the gas.

    Use a separate vent. If you have a typical composition shingled roof its fairly simple to cut a hole, and use a roof jack to cover the vent pipe. We prefer type B vent caps to keep the rain out.

  4. #4
    Join Date
    Mar 2011
    Posts
    6

    Default Re: Shower Moisture Venting Question

    Thanks so much for the suggestions guys!

    I totally forgot about the gases (explosive) inside those pipes.

    Looks like maybe I can rent a hammer drill and drill a hole in the exterior wall for a side vent cap.

    I have clay roof tiles so I don't even want to bother with that stuff.

    thanks again for the suggestions!

  5. #5
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,509

    Default Re: Shower Moisture Venting Question

    I see a possible problem going horizontally. You need to check your local code about that, down at your building department.

    In my city there is a formula that allows only a portion of the vent to go horizontally.

    BTW, there are many old homes around, which have fans venting into attics. But new constructions needs to be to current code.

  6. #6
    Join Date
    Jan 2009
    Posts
    14

    Default Re: Shower Moisture Venting Question

    I moved into an older house in the country a year ago and found out that mine vented into the attic. I didn't like the idea of going through the roof, so I went out the gable side of the house. I didn't have a hole saw for the 4 inch attachment to my drill so I found a whole set through harbor freight for a real reasonable price. Installation was a breeze, just check to see if you need a converter for the fan box to go from a square to round opening to connect the hose. Much better than having moisture in the attic!

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