venting 2nd floor bath

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by bwc, Dec 2, 2012.

  1. bwc

    bwc New Member

    Joined:
    Dec 1, 2012
    Location:
    NB
    I am adding a new bathroom on the second floor. Can I tap into the vent from the first floor bath in the attic so to save from putting another vent through the roof? The horozontal distance is about 15'. If so, can I do it with 1 1/2" pipe (ABS)?
     
  2. jimbo

    jimbo Plumber

    Joined:
    Aug 31, 2004
    Location:
    San Diego
    You can tap your 2nd floor vent into that. You can NOT put any WASTE into that vent line from the first floor. Your second floor vents cannot be horizontal ( less than 45 degrees) until 42" above the floor, and must ALWAYS have some minimum continuous slope back towards the drain, to avoid bellies which would fill up with rain water
     
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  4. Hammerlane

    Hammerlane Member

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    Oct 22, 2011
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    Ohio
    see if this helps, what size is the vent going thru the roof? 3"?
     

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  5. bwc

    bwc New Member

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    Dec 1, 2012
    Location:
    NB
    Thanks. That is helpfull
     
  6. cacher_chick

    cacher_chick Test, Don't Guess!

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    If you are running a new vent through the roof you will also want to look at your local code. Many places will not allow a vent smaller than 3 or 4" to penetrate the roof due to the possibility of frost closure during the winter.
     
  7. SacCity

    SacCity In the Trades

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    Mar 14, 2011
    Location:
    Sacramento, CA
    If you are going to have a toilet in the bathroom, min vent size is 2 inch
     
  8. Tom Sawyer

    Tom Sawyer In the Trades

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    Nov 29, 2010
    Location:
    Maine


    Only if he's under the UPC. Under IPC it can be 1-1/2 and it doesn't even have to be in the same location as the WC
     
  9. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    quote; Under IPC it can be 1-1/2 and it doesn't even have to be in the same location as the WC

    THe IPC would probably allow it to be in the house next door, if that was the cheapest way to install it.
     
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