(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: Connecting dwv vents in attic

Hybrid View

  1. #1
    DIY Junior Member Finishguy007's Avatar
    Join Date
    Mar 2013
    Location
    Pgh Pa
    Posts
    4

    Default Connecting dwv vents in attic

    1 shower, 2 sinks, 1 whirlpool tub and 1 toilet. Can all these vents connect in the attic and return to the main 3" vent stack? Distance they must travel in attic is 25' approx.

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    Yes.

    If the horizontal is more than 1/3 the vertical, you go up one pipe size.

  3. #3
    DIY Junior Member Finishguy007's Avatar
    Join Date
    Mar 2013
    Location
    Pgh Pa
    Posts
    4

    Default

    If the horizontal run is 1/3 the vertical rise. Is that what you mean?

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,202
    Blog Entries
    1

    Default

    If the horizontal run is 1/3 the vertical rise. Is that what you mean?
    More than. It can be up to 1/3 the vertical. If more than that, it bumps a size. That keeps the inspector happy.
    That hardly ever comes into play.

  5. #5
    DIY Junior Member Finishguy007's Avatar
    Join Date
    Mar 2013
    Location
    Pgh Pa
    Posts
    4

    Default

    I guess I'm confused on what you mean by horizontal and vertical. Thx for taking this time to help.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,405

    Default

    Your total length of the horizontal run must be less than 1/3'rd the total length of the pipe's vertical run, or you need to bump the pipe size up one. The idea is that any horizontal pipe run still needs some slope to it, and you need to still have an air path for it to work as a vent in case for some reason it got some moisture in there (say rain, condensation, or whatever).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

Similar Threads

  1. Tips/tricks for vents in attic?
    By pghsebring in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 10-08-2011, 08:36 AM
  2. stack vents and roof vents-
    By cacher_chick in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 01-10-2011, 07:48 PM
  3. Tying together branch vents in attic question
    By Mr_Magoo in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 03-09-2008, 04:07 PM
  4. These are not vents
    By jar546 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 27
    Last Post: 02-23-2008, 10:48 PM
  5. Sure Vents?
    By DIYguy2 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 0
    Last Post: 02-06-2006, 10:05 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •