Question on proper venting of a shower drain


  #1  
Old 06-14-17, 02:56 AM
SJMaye's Avatar
Member
Thread Starter
Join Date: Feb 2011
Location: United States
Posts: 289
Received 1 Upvote on 1 Post
Question on proper venting of a shower drain

I am converting a tub/shower combo to a shower only, so the drain and overflow tubes will be replaced with the drain only. I want to do this correctly. This home is 30 years old. I have already dealt with several venting issues. I want to make sure the vent is correct for the new shower.

The photo below shows what I currently have. Is this the correct way to vent a shower drain?

Name:  20170613_093222.jpg
Views: 13689
Size:  36.6 KB
 
  #2  
Old 06-14-17, 07:46 PM
steve_gro's Avatar
Member
Join Date: Jan 2004
Location: San Francisco
Posts: 967
Upvotes: 0
Received 1 Upvote on 1 Post
One way would be to replace the 90 with a sanitary tee, then run the vent to >42" above the floor and tie into the vent-thru-roof. Or just run it thru the roof by itself if that's easier. If there's an attic, that might be a place to tie in.

 
  #3  
Old 06-15-17, 01:44 PM
Z
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 5,874
Received 372 Upvotes on 332 Posts
Steve has the answer. The only other way I can see is to rework the 3" main drain to raise it up, so the shower would wye into it horizontally. Your issue is that you can't have the vertical drop after the p-trap without a vent.

Also, it's a bit hard to tell from the pic, but the shower drain needs to be 2". Tubs are often 1.5".
 
  #4  
Old 06-16-17, 06:23 PM
steve_gro's Avatar
Member
Join Date: Jan 2004
Location: San Francisco
Posts: 967
Upvotes: 0
Received 1 Upvote on 1 Post
I should also mention that the vent can be 1".
 
  #5  
Old 06-17-17, 05:30 AM
SJMaye's Avatar
Member
Thread Starter
Join Date: Feb 2011
Location: United States
Posts: 289
Received 1 Upvote on 1 Post
I appreciate the input guys. I am constantly surprised at how this how was incorrectly plumbed or how codes may have changed over the last 30 years.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: