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 10-23-2012, 09:05 AM   #1
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


I'm rethinking my garage utility sink / service sink install. I posted a question about a week ago concerning that. I'm getting mixed info concerning drainage fixture units and how many can drain into a certain size branch drain. My main question is:

Can I have a bath sink(lav) and a garage utility sink both draining into a 1.5" horizontal branch drain? A bath sink is 1 DFU and a service sink/laundry sink is 2 DFU.

Photo #1 is existing and the 1.5" I have labeled in red is showing the drain for a 1st floor bath sink that eventually ties into the 2" before the stack.

Photo #2 is looking the opposite way as photo #1.

Photo #3 is same as Photo #1 but I have placed in a 2 x 2 x 1.5 wye into the 2". The blue lines are depicting 1.5" PVC from the sink in garage.

Photo #4 is same as Photo #1 but I have placed in a 1.5 x 1.5 x 1.5 wye into the 1.5".

Would either arrangement in photo #3 or Photo #4 be OK to pick up the drainage for the garage sink?

As a note I will be using an AAV to vent the garage utility and the length of 1.5" shown in the basement photo is about 14 feet. Then there is probably another 5 feet of 1.5" in the wall to the bath sink.
Attached Thumbnails
Can bath sink and service sink drain into 1.5" branch drain-look-rearward1.jpg  


Last edited by hammerlane; 03-05-2013 at 09:14 AM.
hammerlane is offline   Reply With Quote
Old 10-23-2012, 09:21 AM   #2
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

Can bath sink and service sink drain into 1.5" branch drain


All "Sinks" require a 2" drain by UPC.

Lavatories can be 1.5"

__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 10-23-2012, 11:00 AM   #3
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


Quote:
Originally Posted by Alan View Post
All "Sinks" require a 2" drain by UPC.

Lavatories can be 1.5"
I was looking at the chart for drainage fixture units from IPC which I think Ohio is:

OK for lav sink =1 DFU and service sink/laundry sink =2 DFU
As I read 710.1(1), a 1.5" branch can have a max of 3 DFU


So there must be something that overrides the above and states that any sink other than lavatories must be 2"?
Attached Thumbnails
Can bath sink and service sink drain into 1.5" branch drain-709.1-dfu-values.jpg   Can bath sink and service sink drain into 1.5" branch drain-710.1.jpg  
hammerlane is offline   Reply With Quote
Old 10-23-2012, 11:11 AM   #4
Member
 
Join Date: Mar 2011
Location: Ohio
Posts: 1,646
Rewards Points: 1,000
Default

Can bath sink and service sink drain into 1.5" branch drain


i would cut the 1-1/2 line to the lav out of the way and run 2 inch all the way towards the garage and pickup the lav drain with a 2x1-1/2x1-1/2 wye where it turns towards the foam in pic 2. that way you only have one line in that bay and would be much easier than trying to run another line next to the line that picks up the lav.

Last edited by DannyT; 10-23-2012 at 11:15 AM.
DannyT is offline   Reply With Quote
Old 10-23-2012, 11:40 AM   #5
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


Quote:
Originally Posted by DannyT View Post
i would cut the 1-1/2 line to the lav out of the way and run 2 inch all the way towards the garage and pickup the lav drain with a 2x1-1/2x1-1/2 wye where it turns towards the foam in pic 2. that way you only have one line in that bay and would be much easier than trying to run another line next to the line that picks up the lav.
Thats a good idea and is under consideration.
Thanks for the suggestion.
hammerlane is offline   Reply With Quote
Old 10-23-2012, 11:42 AM   #6
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


Quote:
Originally Posted by Alan View Post
All "Sinks" require a 2" drain by UPC.

Lavatories can be 1.5"

I've looked in UPC and IPC and cannot find the specific designation for all Laundry sinks, Kitchen sinks, Service sinks..."sinks" to be 2" after the trap arm. Can you provide it?

Thanks
hammerlane is offline   Reply With Quote
Old 10-23-2012, 12:03 PM   #7
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


I should note that I am going to have a "laundry tray" sink in the garage...not necessarily a service sink. But "laundry tray" sink and service sink are same dfu's

Last edited by hammerlane; 10-23-2012 at 12:10 PM.
hammerlane is offline   Reply With Quote
Old 10-23-2012, 12:47 PM   #8
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 7,529
Rewards Points: 2,398
Default

Can bath sink and service sink drain into 1.5" branch drain


Good timing on this thread.....I'm asking basically the same questions.......

So....what is the difference between a lavatory sink vs a bathroom sink?

I was just told this morning that I don't need a cleanout on a second floor drain.
__________________
"The dream is free but the hustle is sold separately."

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, 01:00 PM   #9
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


Quote:
Originally Posted by ddawg16 View Post
Good timing on this thread.....I'm asking basically the same questions.......

So....what is the difference between a lavatory sink vs a bathroom sink?

I was just told this morning that I don't need a cleanout on a second floor drain.
A lavatory sink is a bathroom sink. Can't answer the question on the cleanout.

BATHROOM GROUP. A group of fixtures consisting of a water closet, lavatory, bathtub or shower, including or excluding a bidet, an emergency floor drain or both. Such fixtures are located together on the same floor level.
hammerlane is offline   Reply With Quote
Old 10-23-2012, 01:01 PM   #10
moderator
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,061
Rewards Points: 2,300
Default

Can bath sink and service sink drain into 1.5" branch drain


UPC table 7-3 states
Laundry sink with or without clothes washer is 2 fu
UPC table7-5 states max. 1 fu on 1.5" horizontal line
Also states in footnote 2- sinks must be on 2 " line

Lavs are not defined as sinks. Table 7-3 has a lav listed as 1 du, therefor 1.5" pipe is legal

Sent from my iPhone using DIY Forum
__________________
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, 01:12 PM   #11
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


Quote:
Originally Posted by TheEplumber View Post
Also states in footnote 2- sinks must be on 2 " line

Only certain sinks like kitchen, commercial with food waste have that footnote. The laundry sink does not.
Attached Thumbnails
Can bath sink and service sink drain into 1.5" branch drain-upc.jpg  
hammerlane is offline   Reply With Quote
Old 10-23-2012, 01:14 PM   #12
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


here is the top half of the page from above
Attached Thumbnails
Can bath sink and service sink drain into 1.5" branch drain-upc2.jpg  
hammerlane is offline   Reply With Quote
Old 10-23-2012, 01:15 PM   #13
JOATMON
 
ddawg16's Avatar
 
Join Date: Aug 2011
Location: S. California
Posts: 7,529
Rewards Points: 2,398
Default

Can bath sink and service sink drain into 1.5" branch drain


Hammer.....just wondering....why do you use white PVC when we have to use the black ABS?
__________________
"The dream is free but the hustle is sold separately."

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, 01:31 PM   #14
moderator
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,061
Rewards Points: 2,300
Default

Can bath sink and service sink drain into 1.5" branch drain


Hammer- it's true that the foot note is not there, however look at table 7-5. How many dfu's can you load on a 1.5 horizontal line? 1. Your sink is rated at 2
Codes do vary though so talk to your local authority for clarification.
As a side note, plumbers in my area rarely use 1.5" for drainage- usually just on trap arms and venting

Sent from my iPhone using DIY Forum
__________________
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, 04:40 PM   #15
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,558
Rewards Points: 2,024
Default

Can bath sink and service sink drain into 1.5" branch drain


Quote:
Originally Posted by TheEplumber View Post
Hammer- it's true that the foot note is not there, however look at table 7-5. How many dfu's can you load on a 1.5 horizontal line? 1. Your sink is rated at 2
Codes do vary though so talk to your local authority for clarification.
You can load 3 DFU's onto a 1.5" horizontal branch. The Lav is 1 DFU and the Laundry sink in the garage is 2. But I have about 20 feet of 2" lying around so I think we will
-cut out The majority of the existing 1.5" for the lav sink--highlighted in green in the photo below.
-the laundry sink for garage will come thru rim joist where the blue circle is in the photo--- between the two water lines which are wrapped in foam
-run all 2" to the laundry sink in the garage and the pick up the lav sink with a 2 x 2 x 1.5 wye.
Attached Thumbnails
Can bath sink and service sink drain into 1.5" branch drain-look-20rearward1.jpg  

hammerlane 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





Top of Page | View New Posts

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