Return to the Plumbing Forum | Post a Follow-Up

Vent stack arrangement

Posted by In-sani-tee (My Page) on
Tue, Oct 16, 12 at 2:13

I am remodeling my home bathroom. It is 55 years old, raised foundation, single story, California plumbing code, with cast iron waste lines. The cast iron is heavily corroded inside & out so I am replacing it with ABS. (It is easy to work in the crawl space during this remodel because I had to pull up all the floor boards due to water damage. I can easily reach all the cast iron while standing between the open joists!) The bath remodel moves the sink and shower so I can't just copy the original layout of the waste lines. The toilet is back-to-back with another toilet in the adjoining bathroom. The 3" main stack/vent is in the wall between the toilets. The two toilets will dump into the stack with a 3"x3" double sani-T. I also want to drain the sink and shower into the main stack via another double T that has 2" inlets on opposite sides. The sink is re-vented into the main 3" vent at about 40" from the floor. The shower drain will be 3 ft from the main stack so 2" pipe from the shower trap to the main vent should be good without another vent line for the shower.

Here is my question: does it matter if the sink/shower tee is above or below the toilet tee in the stack? The vertical distance between the T's will be about 8", and it is considered to be a wet vent for that 8".

Thanks in advance for your advice.

Follow-Up Postings:

RE: Vent stack arrangement

The sink/tub drains must be above the WC drains. Code prohibits any fixture arms below the WC fixture arms.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Plumbing Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here