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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-22-2012, 07:49 PM   #1
Newbie
 
Join Date: Jul 2011
Posts: 11
Rewards Points: 10
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Question from a DIYer new to plumbing.

I'm installing a bar sink in a spare room in my basement and the closest spot the sewer line in the house is exposed is about 16' away. Based on the standards I'm going to be using 1.5" DWV ABS pipe and know that the drop I'm supposed to use is .25" per foot.

The issue that I have is that there is a bathroom between the room I'm doing the installation and the main line. Based on the drop, the toilet tank is too close to the wall and will prevent me from installing the pipe outside the wall and boxing it in (the wall is an exterior wall and my understanding is that code forbids the pipe from being installed inside an exterior wall, presumably due to the risk of freezing and/or condensation.

This said, what is the best option for installing the pipe? Can I tie directly into the outlet under the toilet, raise the toilet, change the drop from 1/4 to 1/8 for the last section, buy a new toilet with a higher base?

Suggestions more than welcome!!!

Thanks!

dblade is offline   Reply With Quote
Old 10-22-2012, 07:57 PM   #2
moderator
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,136
Rewards Points: 2,432
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


A sink needs a 2" drain line, not 1.5"
The trap arm after the vent can be 1.5"
1/4" per ft is minimum grade for 2" pipe
You can pipe in an exterior wall if it's in the basement- it wont freeze and is non bearing
You might be able to pipe the sink to the toilet vent- need more info from you, such as how its piped now

__________________
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
Old 10-22-2012, 08:25 PM   #3
Newbie
 
Join Date: Jul 2011
Posts: 11
Rewards Points: 10
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Thanks for the response, I'll likely end up removing the toilet and opening the wall to see how its vented now, with nothing exposed I have no idea, and frankly am curious myself...

After I've done that I'll sketch it out and post it.

I'm kind of confused that you've indicated a need for a 2" pipe on a sink, everything I've read so far, including the Ontario Building code (Table 7.4.9.3) seems to indicate 1.5" is fine for a regular domestic sink unless you have a garbage disposal on it?
dblade is offline   Reply With Quote
Old 10-22-2012, 08:29 PM   #4
moderator
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,136
Rewards Points: 2,432
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Codes do vary. UPC states sinks are 2" (and need a clean out)
Trap arms may be 1.5"
__________________
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
Old 10-22-2012, 08:54 PM   #5
Member
 
Join Date: Jan 2012
Location: ohio
Posts: 1,112
Rewards Points: 532
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


can you tye into the sink in bathroom
__________________
"be careful at listening to just one persons advise" said me
"be careful at listening to just one persons advise" said myself
p.s. not all i say is a fact but not all i say is my opinion.
jaydevries is offline   Reply With Quote
Old 10-22-2012, 10:21 PM   #6
Newbie
 
Join Date: Jul 2011
Posts: 11
Rewards Points: 10
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Unfortunately not as the sink is on the opposite side of the bathroom. I've posted a rough layout to make it clearer.
Attached Thumbnails
Drop for sink drain, does it need to be .25"-ft the whole length?-layout.jpg  

Last edited by dblade; 10-22-2012 at 10:25 PM.
dblade is offline   Reply With Quote
Old 10-22-2012, 10:25 PM   #7
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,762
Rewards Points: 2,024
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Quote:
Originally Posted by dblade View Post
I've posted a rough layout to make it clearer.

Is it in this thread? It's not showing up for me.

Oh, I commend you on your ninja edit.
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 10-22-2012, 10:27 PM   #8
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,762
Rewards Points: 2,024
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Does the waste and vent stack exit the building near where it goes into the slab? You could always run the drain outside of the building and tie into the building drain in the yard.

__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 10-22-2012, 11:02 PM   #9
Newbie
 
Join Date: Jul 2011
Posts: 11
Rewards Points: 10
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


No luck with that option at all, the line runs under the slab to the front of the house. I'm in Ontario, Canada, so no real option for an exterior tie in. Had a contractor give me a ball-park price for chipping the slab and doing a tie in in the room where the sink is going and he was figuring about $1200 (old cast iron main pipe under the house) so not even remotely cost effective
dblade is offline   Reply With Quote
Old 10-22-2012, 11:05 PM   #10
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,762
Rewards Points: 2,024
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Quote:
Originally Posted by dblade View Post
No luck with that option at all, the line runs under the slab to the front of the house. I'm in Ontario, Canada, so no real option for an exterior tie in. Had a contractor give me a ball-park price for chipping the slab and doing a tie in in the room where the sink is going and he was figuring about $1200 (old cast iron main pipe under the house) so not even remotely cost effective
Couldn't you tie into the main stack below grade, and run it outside of the building anyway?
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 10-22-2012, 11:13 PM   #11
Member
 
Join Date: Jan 2012
Location: ohio
Posts: 1,112
Rewards Points: 532
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


here it goes get ready for a war i have ran a lot of under 3" pipe at 1/8 per a foot under only way to make it work and it has always worked
__________________
"be careful at listening to just one persons advise" said me
"be careful at listening to just one persons advise" said myself
p.s. not all i say is a fact but not all i say is my opinion.
jaydevries is offline   Reply With Quote
Old 10-22-2012, 11:27 PM   #12
moderator
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,136
Rewards Points: 2,432
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Quote:
Originally Posted by jaydevries View Post
here it goes get ready for a war i have ran a lot of under 3" pipe at 1/8 per a foot under only way to make it work and it has always worked
And I've used pumps in this type of situation too
__________________
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
Old 10-23-2012, 12:08 AM   #13
Newbie
 
Join Date: Jul 2011
Posts: 11
Rewards Points: 10
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Quote:
Originally Posted by TheEplumber View Post
And I've used pumps in this type of situation too
Hmmm... pump might be worth a shot... @jaydevries, from what I've read you've likely been fine with the 3" pipe at that drop since the pipe is unlikely to ever fill up entirely with water... though if I have to start putting 3" pipe in to deal with a little bar sink I'm going to make all future holes in the wall by banging my head against them
dblade is offline   Reply With Quote
Old 10-23-2012, 02:12 AM   #14
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 7,567
Rewards Points: 2,464
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Quote:
Originally Posted by TheEplumber View Post
Codes do vary. UPC states sinks are 2" (and need a clean out)
Trap arms may be 1.5"
Not trying to hijack the thread....

But to confirm....ALL sinks have to go into a 2" drain? Even bathroom sinks?

I was under the impression it could be 1 1/2".
__________________
Even if you are on the right track, you will still get run over if you just sit there.

My 2-Story Addition Build in Progress Link ... My Garage Build Link and My Jeep Build Link
ddawg16 is online now   Reply With Quote
Old 10-23-2012, 04:49 AM   #15
Thread killer
 
Join Date: May 2011
Location: Southwestern Ontario, Canada
Posts: 303
Rewards Points: 266
Default

Drop for sink drain, does it need to be .25"-ft the whole length?


Quote:
Originally Posted by ddawg16 View Post
Not trying to hijack the thread....

But to confirm....ALL sinks have to go into a 2" drain? Even bathroom sinks?

I was under the impression it could be 1 1/2".
The OP is in Ontario, Canada. We can run our kitchen and shower drains in 1.5", provided you have a minimal fixture unit.

__________________
You can have it good, fast or cheap. Pick two.
Canucker is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Central Air Secondary Drain Leaking - 3 questions walters_12 HVAC 7 05-11-2011 04:20 PM
AC drain pipe vent trap going dry - sewage smell denemante Plumbing 6 04-26-2011 07:52 PM
Leaking cast iron drain pipes + roots in 4" main line aminus21 Plumbing 5 09-25-2010 11:21 AM
Drop in bath tub center drain to lft drain mikerich28@hotmail.com Remodeling 1 04-16-2008 09:48 PM
Pot lights in a drop ceiling Howdy Electrical 3 03-14-2008 09:23 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.