Minimum Drain Size For Tub/shower And For Sink - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 10-05-2012, 12:55 AM   #1
Member
 
Join Date: Aug 2010
Posts: 144
Rewards Points: 77
Default

minimum drain size for tub/shower and for sink


If a sink or a tub/shower has a 1.5" tailpiece, is there any advantage to having it drain into a 2" pipe rather than just keeping the drain pipe the same 1.5" size as the tailpiece ?

Thanks,
Arky

Advertisement

Arky217 is offline   Reply With Quote
Old 10-05-2012, 01:12 AM   #2
Plumber/Contractor
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,248
Rewards Points: 2,614
Default

minimum drain size for tub/shower and for sink


Quote:
Originally Posted by Arky217 View Post
If a sink or a tub/shower has a 1.5" tailpiece, is there any advantage to having it drain into a 2" pipe rather than just keeping the drain pipe the same 1.5" size as the tailpiece ?

Thanks,
Arky
No big advantage but it won't hurt either.
My state does not allow 1.5" pipe under a slab, so all our basement tubs and lavs are piped 2".

Advertisement

__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
TheEplumber is online now   Reply With Quote
The Following 2 Users Say Thank You to TheEplumber For This Useful Post:
ben's plumbing (10-05-2012), oh'mike (10-05-2012)
Old 10-05-2012, 08:17 AM   #3
Member
 
Join Date: Jan 2009
Location: WV
Posts: 3,012
Rewards Points: 2,204
Default

minimum drain size for tub/shower and for sink


Quote:
Originally Posted by TheEplumber View Post
My state does not allow 1.5" pipe under a slab, so all our basement tubs and lavs are piped 2".
Do you know the basis for this rule? Just curious.
md2lgyk is offline   Reply With Quote
Old 10-05-2012, 11:10 AM   #4
Plumber/Contractor
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,248
Rewards Points: 2,614
Default

minimum drain size for tub/shower and for sink


Quote:
Originally Posted by md2lgyk View Post
Do you know the basis for this rule? Just curious.
No, not really. I started plumbing here in the mid 80's and that rule was in place then too. I have been told that since 1.5" is used mostly on lavs and tubs, it is upsized to avoid blockage as it is not accessible (under slab) to repair. But thats not an official response. The rule holds for venting under slab too.
Here's another one- regardless of the fixture load on the building drain, I must stub 4" out of the building with a 4" clean out.
You can tell when a Washington plumber crosses the border for work- they sometimes forget these rules.
We work off UPC and are in the process of adopting IPC (Idaho Plumbing Code) It too is adopted from UPC. but has several venting modifications- or so I'm told. I haven't read it yet
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
TheEplumber is online now   Reply With Quote
Reply


Thread Tools
Display Modes

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Top of Page | View New Posts