Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


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 09-18-2012, 10:09 PM   #1
Newbie
 
Join Date: Sep 2012
Posts: 8
Share |
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Re-Doing the laundry room and moving the washer from one side of the room to the other. Basically, the vent line for a 2" drain line needs to go under the ibeam for house, before it goes straight to the roof. I'm essentially creating a P trap in the vent line. If I drain that P trap at the lowest point straight into the main stack for the house, can I still use that line as a vent?

I could run the vent so it doesn't have to dip down, but I'd have to drill through 10 joists, which I'd rather not do.


http://imgur.com/a/6UdHR

Thanks!

Last edited by calphalon; 09-18-2012 at 10:21 PM. Reason: Edit: Sorry for typo in title
calphalon is offline   Reply With Quote
Old 09-18-2012, 11:08 PM   #2
call me E
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: Idaho
Posts: 6,181
Default

Vent line has goes UP, down, UP - can I drain lowest point?


A vent always goes up- never down
__________________
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 09-19-2012, 07:35 AM   #3
Member
 
Join Date: Oct 2011
Location: pa
Posts: 4,004
Default

Vent line has goes UP, down, UP - can I drain lowest point?


well if you want it to work....have to do it the proper way..can't go down looks like you need a sharp new bit for your drill.....
ben's plumbing is online now   Reply With Quote
Old 09-19-2012, 08:49 AM   #4
Newbie
 
Join Date: Sep 2012
Posts: 8
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Suggestions on an AAV?

Also, if I have the washer/sink on the same line, is it bad to have the P trap below the floor?

Thanks
calphalon is offline   Reply With Quote
Old 09-19-2012, 08:07 PM   #5
retired elect/hvac/plumb
 
plummen's Avatar
 
Join Date: Jan 2010
Location: south east of omaha/The island of misfit contractors
Posts: 2,792
Default

Vent line has goes UP, down, UP - can I drain lowest point?


How about a picture?
__________________
"facts" have no relevance to this discusion
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Posting from a concrete bunker under a non descript barn
plummen is offline   Reply With Quote
Old 09-19-2012, 08:35 PM   #6
Newbie
 
Join Date: Sep 2012
Posts: 8
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Quote:
Originally Posted by plummen View Post
How about a picture?
Drawings work?

http://imgur.com/a/6UdHR
calphalon is offline   Reply With Quote
Old 09-19-2012, 08:42 PM   #7
retired elect/hvac/plumb
 
plummen's Avatar
 
Join Date: Jan 2010
Location: south east of omaha/The island of misfit contractors
Posts: 2,792
Default

Vent line has goes UP, down, UP - can I drain lowest point?


oopsies,duplicate!
__________________
"facts" have no relevance to this discusion
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Posting from a concrete bunker under a non descript barn

Last edited by plummen; 09-19-2012 at 08:52 PM.
plummen is offline   Reply With Quote
Old 09-19-2012, 08:51 PM   #8
retired elect/hvac/plumb
 
plummen's Avatar
 
Join Date: Jan 2010
Location: south east of omaha/The island of misfit contractors
Posts: 2,792
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Are you tying the p-trap into a san tee or is that some sort of s-trap?
Looks like an s-trap dropping into 90 from your picture anyway.
It looks like you should have enough room to cut a wye in there and still loop it back between the floor joists and then bring it up through the floor to cut it into that vent stack higher than the level of the washing machine.
Its not a legal vent unless its tied in above flood level of fixture its venting,if that makes sense to you.
__________________
"facts" have no relevance to this discusion
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Posting from a concrete bunker under a non descript barn
plummen is offline   Reply With Quote
Old 09-19-2012, 09:42 PM   #9
Member
 
Join Date: Sep 2012
Location: Airdrie, AB, Canada
Posts: 61
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Quote:
Originally Posted by calphalon View Post
Suggestions on an AAV?

Also, if I have the washer/sink on the same line, is it bad to have the P trap below the floor?

Thanks
Well, long time ago I did a bathroom, I was trying to cut corners and I didn't have much space for the ptrap to be inside the vanity, so I install one ptrap for the sink and the bathtub. It worked just fine, but after some time I notice some ugly smell coming from the sink, it wasn't easy to get rid of it (only by flushing with lots of water the sink). It was that with normal use, you get soap and shaving foam and hair and all kind of stuff that get stuck to the interior walls of the drain, and they smell because there is no ptrap on the top, only on the bottom and far away.
Long story short, since them I always install every single fixture with it's own ptrap (specially the sink!).
By the way, you can't install 2 p-traps in series, that's a no-no, so plan well in advance.
Pirulo is offline   Reply With Quote
Old 09-19-2012, 09:47 PM   #10
Member
 
Join Date: Sep 2012
Location: Airdrie, AB, Canada
Posts: 61
Default

Vent line has goes UP, down, UP - can I drain lowest point?


By your drawing, I'd connect the vent just where you draw the blue arrow, and eliminate everything that is to the left of the ibeam, so the vent is actually like a continuation of the 3" stack.
Pirulo is offline   Reply With Quote
Old 09-19-2012, 10:18 PM   #11
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,683
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Short answer : No you can't do that.
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 09-19-2012, 10:37 PM   #12
call me E
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: Idaho
Posts: 6,181
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Quote:
Originally Posted by calphalon View Post
Re-Doing the laundry room and moving the washer from one side of the room to the other. Basically, the vent line for a 2" drain line needs to go under the ibeam for house, before it goes straight to the roof. I'm essentially creating a P trap in the vent line. If I drain that P trap at the lowest point straight into the main stack for the house, can I still use that line as a vent?

I could run the vent so it doesn't have to dip down, but I'd have to drill through 10 joists, which I'd rather not do.


http://imgur.com/a/6UdHR

Thanks!
my code states p traps for washers must be min. 6" above the floor. So venting on the lower level is pointless.
__________________
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 09-19-2012, 10:38 PM   #13
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,683
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Quote:
Originally Posted by TheEplumber View Post
my code states p traps for washers must be min. 6" above the floor. So venting on the lower level is pointless.
Good point. I'm going to go punch myself in the face now for messing that one up.
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 09-20-2012, 12:10 AM   #14
Member
 
Join Date: Sep 2012
Location: Airdrie, AB, Canada
Posts: 61
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Quote:
Originally Posted by Alan View Post
Short answer : No you can't do that.
ups, vent needs to be between 5' from the ptrap, and the ptrap over the level of the floor, and stack pipe over ptrap be from 18" to 42" max length, should verify distances from local code.
Pirulo is offline   Reply With Quote
Old 09-20-2012, 01:22 AM   #15
Newbie
 
Join Date: Sep 2012
Posts: 8
Default

Vent line has goes UP, down, UP - can I drain lowest point?


Hey guys,
Thanks for all the help. Looks like the first idea won't work. Here are my other two options... let me know what you think


#1: an AAV in the cabinet for the sink/washer. No other venting.
http://i.imgur.com/izJPd.png


#2. Because the vent line will no longer be connected to anything (since we're moving washer to other side of room), I can attach it to the top of the stack to provide extra venting on the stack. I can also run 3" piping for the horizontal portion of the drain run to the sink/washer to allow some additional venting.

http://i.imgur.com/7kkb7.png

Is this a good AAV? Some people mentioned it takes a bit of vacuum in the water for the valve to first open... is there a better one out there?

http://www.amazon.com/Oatey-39016-Su.../dp/B000BVMX62
calphalon 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
Adding washer to basement with no way to vent drain pipe General Plumbing 6 12-26-2010 11:11 AM
Water heater drain pan line Bigmike33 Plumbing 1 09-22-2010 08:29 PM
drain to drain to vent? ryanh Plumbing 0 07-12-2010 12:07 PM
Sewer Drain Issues allenzachary Plumbing 20 03-03-2009 07:09 PM
sewer backup and stench jayhill Plumbing 12 08-13-2008 11:06 PM




Top of Page | View New Posts

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