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 01-14-2009, 02:50 AM   #1
Newbie
 
Join Date: Jan 2009
Location: Central Illinois
Posts: 3
Rewards Points: 0
Share |
Default

Drain for a Pedestal sink


Is there any reason why I can't or shouldn't run the drain for a pedestal sink straight down through the floor, leaving nothing showing as far as the drain is concerned, as long as it dumps into 1 1/2" schedule 40 PVC with a trap under the floor? The bathroom was a total gut so I have plenty of room to run all new DWV to the existing stack. Thank you in advance for your feedback.


Last edited by zachsdad; 01-14-2009 at 02:56 AM.
zachsdad is offline   Reply With Quote
Old 01-14-2009, 07:22 AM   #2
Remodeling Contractor
 
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Rewards Points: 0
Default

Drain for a Pedestal sink


as long as you do not mind the gurgling that you will experience.

Bob Mariani is offline   Reply With Quote
Old 01-14-2009, 08:58 AM   #3
Newbie
 
Join Date: Jan 2009
Posts: 3
Rewards Points: 0
Thumbs down

Drain for a Pedestal sink


Quote:
Originally Posted by zachsdad View Post
Is there any reason why I can't or shouldn't run the drain for a pedestal sink straight down through the floor, leaving nothing showing as far as the drain is concerned, as long as it dumps into 1 1/2" schedule 40 PVC with a trap under the floor? The bathroom was a total gut so I have plenty of room to run all new DWV to the existing stack. Thank you in advance for your feedback.
well it dosent sound rite id say there are several reasons to NOT run yur drain straight thru the floor corect installation of a ptrap is about 12 inches below the sink and it should eject horizantaly into a vent that is usualy inside the wall. the vent is my concern sounds like you dont have one an improperly installed ptrap can allow sewer gases to get inside yur home its a saftey issue.can cause ododr issues as well as health problems
Shoogy is offline   Reply With Quote
Old 01-14-2009, 09:30 AM   #4
Newbie
 
Join Date: Jan 2009
Location: Central Illinois
Posts: 3
Rewards Points: 0
Default

Drain for a Pedestal sink


This forum is a good way to learn things and this very well might be a concern but correct me if I'm wrong. Doesn't the overflow on all sink and bathtub drains provide air into the system to equilize the pressure that is created when water flows away from a fixture and eliminating this problem ?

Last edited by zachsdad; 01-14-2009 at 09:36 AM.
zachsdad is offline   Reply With Quote
Old 01-14-2009, 09:43 AM   #5
Remodeling Contractor
 
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Rewards Points: 0
Default

Drain for a Pedestal sink


no, it provides an overflow so the water does not spill onto the floor.
Bob Mariani is offline   Reply With Quote
Old 01-14-2009, 10:14 AM   #6
Member
 
bradnailer's Avatar
 
Join Date: Nov 2008
Posts: 256
Rewards Points: 0
Default

Drain for a Pedestal sink


If you will have easy access to the trap, what you are proposing will probably work but it isn't the best plumbing arrangement. Oftentimes, to clear a clogged drain, I've had to remove the trap and it would suck if I had to crawl under the house every time to remove the trap.

I guess I'm not offended by the drain pipes running into the wall behind a pedistal sink. You can use chrome, brass and even oil rubbed bronze drain lines which will look OK. In fact, I have a pedistal sink in a small bathroom and our fixtures are oil rubbed bronze. I used normal PVC drain pipe and painted it with rattle can oil rubbed bronze paint and it looks just fine.
bradnailer is offline   Reply With Quote
Old 01-14-2009, 10:38 AM   #7
Remodeling Contractor
 
Join Date: Dec 2008
Location: Sandy Hook, CT
Posts: 3,590
Rewards Points: 0
Default

Drain for a Pedestal sink


I did a job a while ago and the vent was in the wall, but I placed the trap in the basement to allow more storage space in the kitchen sink cabinet, It does work, but when it drains, it gurgles and I had to more the trap back into the cabinet to fix it. Not sure why, but this was my experience.
Bob Mariani is offline   Reply With Quote
Old 01-15-2009, 06:59 AM   #8
Man of many hats
 
wrangler's Avatar
 
Join Date: Oct 2008
Location: Florida Panhandle
Posts: 496
Rewards Points: 0
Default

Drain for a Pedestal sink


"Why" is because you have 3 feet of air that needs to escape to allow the water to drain, thus the gurgling. I would also be worried that if something fell into the drain, such as a ring, you'd have a hard time getting to the p-trap to remove it.
__________________
Man of many hats
wrangler is offline   Reply With Quote
Old 01-15-2009, 09:34 PM   #9
Member
 
Join Date: Nov 2008
Posts: 113
Rewards Points: 0
Default

Drain for a Pedestal sink


A vent needs to be before a p-trap, what you are saying that as the water flows through the p-trap, its pulling the air from your bathroom down with it, but the water keeps pulling the air through and syphons the water from the p-trap, leaving a dry p-trap to stink your house up. You must vent before the p-trap and your vent should run vertically or no less than a 45 degree angle until above flood rim (around 42" AFF in bathroom). If venting is an issue for you, you might be able to get a air admtance valve(studder vent) behind the pedestal.
zosoplumber is offline   Reply With Quote
Old 01-23-2009, 01:33 AM   #10
Newbie
 
Join Date: Jan 2009
Location: Central Illinois
Posts: 3
Rewards Points: 0
Default

Drain for a Pedestal sink


I would like to thank everyone who replied to my thread/question. I took your advice and went ahead and put the trap where it should be, on the tail piece, and ran it back into the wall and over to an existing cast 4" DWV. I had to cut a section out of the cast and put a "Y" fitting in with the rubber couplings. I did not want to cut the cast twice to do the vent so I took zosoplumber's advice and used a air admittance valve (studder vent)? straight up 2 1/2' from the sanitary tee behind the sink. Hooked up the water supply, filled the sink, pulled the plug and it worked great. No gurgling, no nothing. The This Old House website calls installing a pedestal sink "the graduate school of the do it your selfer" and after doing this I have to agree. No dreaded "tink" from tighting the lag bolts, no leaks, and very solid. Looks great. I'm glad I asked the question here and again thanks for the good advice. zachsdad


Last edited by zachsdad; 01-27-2009 at 12:17 AM. Reason: spelling
zachsdad 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
pedestal sink drain stopper not working gernith Plumbing 7 04-18-2008 09:17 PM
How to drain a utility sink that is in basement? Mikey Palmice Plumbing 40 01-28-2008 09:11 PM
Drain placement for sink simonb Plumbing 3 09-08-2007 01:08 PM
pedestal sink drain leaking sully Plumbing 2 02-05-2007 08:01 AM
installing vessel sink drain?! (HELP!) tara Plumbing 2 11-10-2006 12:17 AM




Top of Page | View New Posts

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