Venting Sink Within 16" Of Vent Stack - 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 03-18-2012, 05:36 PM   #1
Member
 
Join Date: Jul 2010
Location: SouthWest Il. Next to St. Louis MO.
Posts: 33
Rewards Points: 25
Default

Venting sink within 16" of vent stack


Hello,

I recently had all the plumbing replaced on the first story and basement level of a 2 1/2 story house. I totally gutted the first story bath so I had open walls and took advantage of that to replace the plumbing back there. The second story bath is directly above the 1st story.

The stack was cast iron and a lot of steel drain pipe. We replaced all we had access to with PVC.

The second story bath has new PVC from the sink down, the toilet down and the bathtub down.

After doing this the slight odor of sewer gas that we discovered when doing the plumbing changes still remained.
This leaves only the 3" cast iron stack from the second story to the roof and a sink vent line on the second story to the cast iron stack to be the culprit.
Please see drawing for details.

Obviously I need to replace some pipe to get rid of the sewer smell. I am not afraid to tear into things but do like to think through and get advice. The house has old wood lathe and plaster so repairs are a little more challenging but not too much. I have done a lot of repairing here so no problem in fixing more access holes wherever needed but again, I just don't want to creating holes if I don't need to.

In the drawing the gray and dark gray pipe are what I need to replace. I have access to the stack from the attic and will have to cut that up in probably two or three pieces to maneuver it out of there.

My question is for the reason that I may be able to change my approach on the fix which would eliminate some need for opening up an access hole.

As indicated in the drawing....
Do I need that vent line from the sink or can I eliminate it?
I know it was there for all these years but that doesn't necessarilly mean it had a functional purpose. With the drain pipes running vertical, then 45, then another 45 and then final pitched to the stack... I don't understand the venting requirements in this case.
Thanks for any input.



Advertisement

jefsboys is offline   Reply With Quote
Old 03-18-2012, 05:50 PM   #2
Master Plumber
 
Javiles's Avatar
 
Join Date: Dec 2011
Location: Miami Florida
Posts: 1,465
Rewards Points: 718
Default

Venting sink within 16" of vent stack


How do you know the sewer gases are coming that section.. And yes if an active drain you do need that vent may be able to use an AAV, not crazy about them but they do work. Check with your local code to see if let you use them.

Advertisement

__________________


Experience is Knowing what to do next, Skill is knowing how to do it

http://www.americandrain.net
Javiles is offline   Reply With Quote
Old 03-18-2012, 05:51 PM   #3
Plumber/Contractor
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,282
Rewards Points: 2,638
Default

Venting sink within 16" of vent stack


Every trap needs a vent. Just because you have vertical pipe and 45's doesn't mean you can eliminate a vent. If allowed by your local code, you could use a auto vent perhaps, still need to find the leak though
__________________
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 03-18-2012, 06:07 PM   #4
Member
 
Join Date: Jul 2010
Location: SouthWest Il. Next to St. Louis MO.
Posts: 33
Rewards Points: 25
Default

Venting sink within 16" of vent stack


Thank you both for your input and time.

The gray pipe on the drawing is the only old pipe left, everything else has been replaced, I guess just kind of bad luck :-).
The smell isn't centralized in the first floor or in the basement(they both were just redone about 4 months ago) but the smell is strong when smelling around the stack as it comes up through the floor in the attic on its way up to and through the roof.

I know that the new pipe could have been installed incorrectly resulting in the odor but that is still open and visually inspecting and the sniffer gives it a pass on the test.

If the venting is definitely needed I will just replace the pipe in the wall.
Like I said I am not afraid to cut open the wall just wanted other advice/input before I began.
jefsboys is offline   Reply With Quote
Old 03-18-2012, 06:15 PM   #5
Master Plumber
 
Javiles's Avatar
 
Join Date: Dec 2011
Location: Miami Florida
Posts: 1,465
Rewards Points: 718
Default

Venting sink within 16" of vent stack


Find someone in your area that can perform a smoke test. Youíll find any leaks within the venting or drain system. Sewer gas smell.
__________________


Experience is Knowing what to do next, Skill is knowing how to do it

http://www.americandrain.net
Javiles is offline   Reply With Quote
Old 03-18-2012, 06:26 PM   #6
Member
 
Join Date: Jul 2010
Location: SouthWest Il. Next to St. Louis MO.
Posts: 33
Rewards Points: 25
Default

Venting sink within 16" of vent stack


I may look into the smoke test.

Not to drag this on and I know there is much on the web about the following but I have read in several places where if the drain is within 5' of the stack that it may not need venting.

I am planning on taking the advice but can someone shed light on this 5' venting requirement? I think I have seen where that distance is a bit different in other areas but 5' seems the number I have seen most.

I am only inquiring so I have a better understanding of this.
jefsboys is offline   Reply With Quote
Old 03-19-2012, 01:09 AM   #7
Newbie
 
Join Date: Mar 2012
Location: Toronto, Ontario, Canada
Posts: 7
Rewards Points: 10
Default

Venting sink within 16" of vent stack


This might be relevant/related. This if for Ontario's code.

page 20-21 http://www.mechanicalbusiness.com/archives/july_2010/
mathx is offline   Reply With Quote
Old 03-19-2012, 07:06 AM   #8
Member
 
Join Date: Oct 2011
Location: Ohio
Posts: 2,629
Rewards Points: 2,166
Default

Venting sink within 16" of vent stack


Quote:
Originally Posted by jefsboys View Post

Not to drag this on and I know there is much on the web about the following but I have read in several places where if the drain is within 5' of the stack that it may not need venting.

I am planning on taking the advice but can someone shed light on this 5' venting requirement? I think I have seen where that distance is a bit different in other areas but 5' seems the number I have seen most.
I believe the 5' measurement has to do with the fixture trap arm.
Attached Thumbnails
Venting sink within 16" of vent stack-tile-bit.jpg  
hammerlane is online now   Reply With Quote
Old 03-19-2012, 12:28 PM   #9
Newbie
 
Join Date: Mar 2012
Location: Toronto, Ontario, Canada
Posts: 7
Rewards Points: 10
Default

Venting sink within 16" of vent stack


great diagram - what area's code is that for?
mathx is offline   Reply With Quote
Old 03-19-2012, 12:54 PM   #10
Member
 
Join Date: Jul 2010
Location: SouthWest Il. Next to St. Louis MO.
Posts: 33
Rewards Points: 25
Default

Venting sink within 16" of vent stack


Maybe a little confused here. My apologies for not picking up on this probably as quick as I should.
You are the experts on this so I am just digging a little deeper into your minds. :-)

So if the trap is within 5' of the vent does it need to have that extra vent going up and tying into the vent above?

From a couple responses I see yes and a couple of responses with the diagrams I read those as no.

Maybe I am reading the responses incorrectly.

BTW: There is no local code to follow. 600 person community. I do like to do it right though and go through extra time, cost and sweat to do so.

Thank you,

Jeffrey
jefsboys is offline   Reply With Quote
Old 03-19-2012, 01:05 PM   #11
Plumber/Contractor
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,282
Rewards Points: 2,638
Default

Venting sink within 16" of vent stack


Quote:
Originally Posted by jefsboys View Post
Maybe a little confused here. My apologies for not picking up on this probably as quick as I should.
You are the experts on this so I am just digging a little deeper into your minds. :-)

So if the trap is within 5' of the vent does it need to have that extra vent going up and tying into the vent above?

From a couple responses I see yes and a couple of responses with the diagrams I read those as no.

Maybe I am reading the responses incorrectly.

BTW: There is no local code to follow. 600 person community. I do like to do it right though and go through extra time, cost and sweat to do so.

Thank you,

Jeffrey
Trap arms per UPC-
1.5" - 3.5'
2" - 5'
Trap arms cannot have vertical offsets. If you are thinking of eliminating the 1.5" vent piping above your lav drain then that fixture will no longer be vented.
__________________
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 03-19-2012, 01:13 PM   #12
Member
 
Join Date: Jul 2010
Location: SouthWest Il. Next to St. Louis MO.
Posts: 33
Rewards Points: 25
Default

Venting sink within 16" of vent stack


Excellent.
That cleared it up for me. The vertical offset is something I thought was introducing a twist I wasn't aware of.

Really appreciate your patience and explanation.

Jeffrey

Advertisement

jefsboys is offline   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


Similar Threads
Thread Thread Starter Forum Replies Last Post
New Roof marknok Roofing/Siding 4 08-06-2011 12:41 PM
Venting a kitchen sink ultracrystal Plumbing 5 11-14-2010 10:33 PM
Soffit venting vs. DCI Smart Vent JDPII Roofing/Siding 1 02-28-2009 09:42 PM
Venting bathroom vent thru dryer duct jredrocker HVAC 2 09-27-2008 11:25 PM
Venting a Pesdestal Sink formarley Plumbing 8 08-08-2005 04:46 PM




Top of Page | View New Posts