(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 4 of 4

Thread: New DWV below slab

  1. #1
    DIY Junior Member ghetterly's Avatar
    Join Date
    Jun 2009
    Location
    Saskatchewan
    Posts
    14

    Default New DWV below slab

    Hello!

    I've been reading for many months as I mentally prepare myself for my basement bathroom reno. The time has come (Canada Day) and now I'm looking for any final words of wisdom (or last rites).

    My 1950's house has an existing bathroom that I'm renovating. The original setup was not done to any code or trade standard and I'm looking to improve upon that.

    Hopefully you can see the picture I uploaded.

    I am planning on tying into the existing drain system at point 1 using a 3" wye and a 3" 45.

    3" pipe will go straight across the bathroom and the 2" washing machine line will connect with a 3x3x2" wye at point 2. The washing machine will have a dedicated 1.5" vent and 2" trap.

    Point 3 will be another 3x3x2" wye for a shower. The shower will have a 2" trap and will vent through point 4.

    Immediately after the shower wye I will use a reduced bushing to go from 3" to 1.5" for a vent line. Directly out of the bushing I will install a 22.5 degree elbow to get some slope on the vent pipe.

    Once the shower vent is in the wall it will continue to the bathroom ceiling and connect up with the washing machine vent. Both vents will then attach to the vent for the basement toilet which goes directly into the attic.

    My main question is: Is there anything wrong with this picture? Will I get bubbles from the washing machine in my shower?
    Attached Images Attached Images  

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,602

    Default Dwv

    And if the 3" line develops a clog from the washer's lint, HOW will you unplug it? There are many ways to install a DWV system, but without knowing wall placements or pipe depths, we cannot tell you if yours is the optimal one or not.

  3. #3
    DIY Junior Member ghetterly's Avatar
    Join Date
    Jun 2009
    Location
    Saskatchewan
    Posts
    14

    Default

    Good call on the clean-out. I will extend the 3" line up into the wall and change to 1.5" vent after that.

    I'm not looking for an "ideal" solution, just something that will work well. Given the general lack of "you dummy" posts, I think this plan will work out fine.

    Thanks for your help! If you have any other suggestions, I'm all ears!

  4. #4
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
    Join Date
    Jun 2009
    Location
    Penticton, BC
    Posts
    810

    Default

    Quote Originally Posted by ghetterly View Post
    Hello!

    I've been reading for many months as I mentally prepare myself for my basement bathroom reno. The time has come (Canada Day) and now I'm looking for any final words of wisdom (or last rites).

    My 1950's house has an existing bathroom that I'm renovating. The original setup was not done to any code or trade standard and I'm looking to improve upon that.

    Hopefully you can see the picture I uploaded.

    I am planning on tying into the existing drain system at point 1 using a 3" wye and a 3" 45.

    3" pipe will go straight across the bathroom and the 2" washing machine line will connect with a 3x3x2" wye at point 2. The washing machine will have a dedicated 1.5" vent and 2" trap.

    Point 3 will be another 3x3x2" wye for a shower. The shower will have a 2" trap and will vent through point 4.

    Immediately after the shower wye I will use a reduced bushing to go from 3" to 1.5" for a vent line. Directly out of the bushing I will install a 22.5 degree elbow to get some slope on the vent pipe.

    Once the shower vent is in the wall it will continue to the bathroom ceiling and connect up with the washing machine vent. Both vents will then attach to the vent for the basement toilet which goes directly into the attic.

    My main question is: Is there anything wrong with this picture? Will I get bubbles from the washing machine in my shower?
    Your method should work fine.

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
  •