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 12-12-2007, 08:19 AM   #1
Newbie
 
Join Date: Dec 2007
Posts: 6
Rewards Points: 0
Share |
Default

Bathroom Sink Drain Leakage


When installing bathroom sink drains I have almost always had a problem with leakage at the large rubber washer just below the sink opening. I'm referring to leakage between the sink bottom and the large rubber washer.

Somewhere I read that applying plumber's putty (not dope) to the threads of the large nut that compresses that washer will prevent leakage via the threads. Has anyone used that method routinely?

Also. would silicone rubber smeared on the rubber washer and perhaps also applied to the threads be likely to work?


Last edited by notaplumber; 12-12-2007 at 08:23 AM.
notaplumber is offline   Reply With Quote
Old 12-12-2007, 08:26 AM   #2
Member
 
Join Date: Sep 2006
Posts: 1,670
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


I don't know how the putty would help, on the threads. I use a light coat of petroleum jelly on the rubber washer so the nut will not hang-up on it and twist while tightening.

__________________
If you have never made a mistake, you haven't done much.
majakdragon is offline   Reply With Quote
Old 12-12-2007, 08:32 AM   #3
Newbie
 
Join Date: Dec 2007
Posts: 6
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


Majakdragon that's the quickest reply I have ever got in any forum ever. Thanks.

I wonder if the underside of the opening in the ceramic sink should be sanded to provide a smoother surface for the rubber washer to make better contact with?
notaplumber is offline   Reply With Quote
Old 12-12-2007, 09:11 AM   #4
Member
 
Join Date: Sep 2006
Posts: 1,670
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


I always inspect around the drain hole for pieces of the material that may have gotten stuck there. Seen it too many times to ignore it. We all try to answer questions quickly, but sometimes we are not online when they come in. Hope the info helps. Good luck.
__________________
If you have never made a mistake, you haven't done much.
majakdragon is offline   Reply With Quote
Old 12-12-2007, 09:16 AM   #5
Newbie
 
Join Date: Dec 2007
Posts: 6
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


I just took a closer look at the sink I am presently working on. The edge of the circular opening below the sink appears to have a nick in it that might make it difficult to seal with the tapered rubber washer (too large a nick to be sanded out).

Many years ago I had a Moen rep tell me to try the rubber washer upside down and in that case I believe it worked. The flat surface around my sink opening is fairly smooth so I'll try that next.
notaplumber is offline   Reply With Quote
Old 12-12-2007, 10:49 AM   #6
Member
 
Join Date: Mar 2006
Posts: 2,083
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


Quote:
Originally Posted by notaplumber View Post
When installing bathroom sink drains I have almost always had a problem with leakage at the large rubber washer just below the sink opening. I'm referring to leakage between the sink bottom and the large rubber washer.

Somewhere I read that applying plumber's putty (not dope) to the threads of the large nut that compresses that washer will prevent leakage via the threads. Has anyone used that method routinely?
Do you apply plumbers putty between the drain and the upper part of the sink?
redline is offline   Reply With Quote
Old 12-12-2007, 12:18 PM   #7
Newbie
 
Join Date: Dec 2007
Posts: 6
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


Yes, I use plumbers putty instead of the furnished rubber gasket. However, any leakage there will simply go down the drain anyway, except for what might leak at the large rubber washer (if I understand correctly how this works)

Last edited by notaplumber; 12-12-2007 at 02:06 PM.
notaplumber is offline   Reply With Quote
Old 12-13-2007, 12:42 AM   #8
Master Plumber
 
Join Date: Jan 2007
Location: Texas
Posts: 169
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


I always use pipe dope ( I like true blue because it is smooth and not gritty) on my pop up assembly on the threads near where I expect the rubber to come into contact with the sink, and on the rubber itself. Water can trickle down the valley of the threads if you don't do this. Never have used putty except on the top side next to the stopper, but I guess that works too on the underside. I also started putting pipe dope on my pvc tubular drain washers and all my brass compression fittings on the ferrule. Can't remember the last time I had a leak.
jpplumber is offline   Reply With Quote
Old 12-16-2007, 07:41 PM   #9
Newbie
 
Join Date: Dec 2007
Posts: 6
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


There is a horizontal flat surface about 1/4 inch wide surrounding the bottom of the drain opening. I reversed the large rubber washer so that the flat side of the washer is on top. I smeared silicone rubber on that surface and wound some teflon tape around the threads of the drain body. My leak problem seems to be solved!

It appears to me that the large rubber washer (gasket) will always have a better chance of providing a good seal if the flat side of the washer is installed upwards. That way there is much more area of contact. So why do instructions always say to install that washer with the tapered side up?
notaplumber is offline   Reply With Quote
Old 12-16-2007, 09:53 PM   #10
Member
 
Join Date: Sep 2006
Posts: 1,670
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


The idea is that the bevel will pull down on the drain and at the same time pull up tight and make a seal in the hole as you tighten the nut.
__________________
If you have never made a mistake, you haven't done much.
majakdragon is offline   Reply With Quote
Old 12-17-2007, 01:26 PM   #11
Newbie
 
Join Date: Dec 2007
Posts: 6
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


The "idea" sounds reasonable, however if the circumference of the hole is not smooth and continuous then the bevel will be unable to make a seal.
notaplumber is offline   Reply With Quote
Old 12-17-2007, 03:18 PM   #12
Member
 
Join Date: Sep 2006
Posts: 1,670
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


AHHHH, if only everything worked as it should. LOL. You are right and sometimes you have to go another route to achieve the needed end.
__________________
If you have never made a mistake, you haven't done much.
majakdragon is offline   Reply With Quote
Old 01-04-2008, 08:23 AM   #13
Newbie
 
Join Date: Nov 2007
Posts: 9
Rewards Points: 0
Default

Bathroom Sink Drain Leakage


Apply a liberal amount of good quality silicone sealant between the ceramic and the rubber washer; let it dry completely before putting on the trap.

This does the trick.

Jimbob 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
Bathroom sink drain leakage RickB Plumbing 3 11-18-2007 01:50 AM
utility sink, washer drain simon Plumbing 4 11-14-2007 07:30 PM
Drain placement for sink simonb Plumbing 3 09-08-2007 01:08 PM
Bathroom sink drain sieve satchmo Plumbing 3 06-07-2007 11:28 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.