Cast iron pipe to PVC in venting

Reply

  #1  
Old 07-13-09, 10:16 AM
Member
Thread Starter
Join Date: Nov 2007
Posts: 3
Received 0 Votes on 0 Posts
Cast iron pipe to PVC in venting

Is it alright to replace a size of pipe by a smaller section to fit it in the wall so that I can have a flat wall while remodeling the bathroom?
 
Sponsored Links
  #2  
Old 07-13-09, 02:51 PM
shacko's Avatar
Member
Join Date: Aug 2005
Location: Baltimore County Maryland
Posts: 2,138
Received 0 Votes on 0 Posts
Replacing Pipe

It depends on what pipe you are replacing and what it is hooked to, more info.
 
  #3  
Old 07-19-09, 01:15 PM
Member
Thread Starter
Join Date: Nov 2007
Posts: 3
Received 0 Votes on 0 Posts
It seems that the pipe is venting everthing in the house but I'm not sure. It is next to the toilet and the tub drain, plus there is another bathroom right under it with shower, sink, toilet, and washer. The cast iron pipe is set on top of a pvc pipe already and attached to it with a rubber gasket and clamps. Even if I could not reduce the size of the pipe, I would definitly replace it with a PVC pipe because of the weight.
 
  #4  
Old 07-20-09, 01:59 PM
shacko's Avatar
Member
Join Date: Aug 2005
Location: Baltimore County Maryland
Posts: 2,138
Received 0 Votes on 0 Posts
If there are no fixtures above the point you're talking about you should be able to go one size smaller, but if anything is connected to it, leave it alone.
 
  #5  
Old 07-27-09, 07:55 PM
Member
Thread Starter
Join Date: Nov 2007
Posts: 3
Received 0 Votes on 0 Posts
Thank you for the info. No nothing is connected to the pipe from there to the roof.
 
  #6  
Old 07-29-09, 04:06 PM
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 4,642
Received 19 Votes on 18 Posts
I believe there's a code stating that there has to be as much vent as there is drain, based on the cross-section area of all the vent pipes and the cross-section area of the main sewer drain. Usually, this means a 3" building drain requires a 3" vent. So downsizing the main stack may not be a good idea.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


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