Sewer Odor In Upstairs Bathroom

Thread Tools Search this Thread Display Modes
Old 10-24-2006, 05:33 PM   #1
Registered User
Mobylola's Avatar
Trade: General
Join Date: Oct 2006
Posts: 1
Rewards Points: 10

Sewer Odor In Upstairs Bathroom

I have a situation where a customer has a strong intermittent odor in his home, mostly in the upstairs bathroom.

In my investigation, I see that the downstairs bathrooms are correctly vented out through the lower level roof, but there seems to be no vent pipe for the upstairs bathroom. I suspect this is the source of the problem whereby the missing vent pipe results in pressure forcing air/odor out through the p-trap in the upstair bathroom.

Since the toliet is alongside the outside wall, I am planning to pull the siding so we can add a vent pipe from the waste pipe through the roof. However, the sinks are on the inside wall and I don't know if I can easily connect drain vent pipes from there to the waste pipe vent.

My two questions are (1) does my conclusion seem right as to the source of the problem and (2) if I only vent the waste pipe and not the sink drains, is the problem likely to remain?

Mobylola is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!




Old 10-24-2006, 07:21 PM   #2
Double-A's Avatar
Trade: GC - Remodeling Specialists
Join Date: Jul 2006
Location: Arkansas
Posts: 4,617
Rewards Points: 2,000
Send a message via ICQ to Double-A

Re: Sewer Odor In Upstairs Bathroom

No real way to tell without a smoke test or just busting into some walls to see why there are no vents.

The stubs for them might be there, but were not taken up through the roof for some reason.


"My clients’ wishes are the center of my attention." -- David Guido, a contractor in Woodstock, N.Y.
New York Times, July 20, 2006
Double-A is offline  
Old 10-24-2006, 09:14 PM   #3
Trade: Commercial Roofing Inspector/ Trainer
Join Date: Oct 2006
Location: Flowery Branch, GA
Posts: 90
Rewards Points: 75

Re: Sewer Odor In Upstairs Bathroom

makes sense to me. Time and material.
BULLHART is offline  
Old 10-24-2006, 10:21 PM   #4
mickeyco's Avatar
Trade: Squirrel Handler
Join Date: May 2006
Location: Chicago
Posts: 3,432
Rewards Points: 2,000

Re: Sewer Odor In Upstairs Bathroom

I'd check the wax ring first, then plug the sink and bath/shower and any overflows and then flush the toilet, then you'll know if there's no vent. You can also plug the stuff above and fill other sinks and tubs in the house, drain them and flush the other toilets at the same time, if there's no vent you'll see it siphoning from the toilet in the bathroom in question. If the bathrooms not used often, I mean for months at a time the water in the sink or bathtub/shower trap can evaporate and let out sewer gas. Check the attic if there is one, I have seen vents terminated in the attic. If it's not vented and you have to install a vent and are going to pull a permit you'll have to do it to code.
mickeyco is offline  
Old 10-26-2006, 02:21 PM   #5
robertc65's Avatar
Trade: Former Electrician
Join Date: Apr 2005
Location: Finksburg, MD
Posts: 312
Rewards Points: 250

Re: Sewer Odor In Upstairs Bathroom

I know that when my wifes hair begins to accumulate in the shower drain It smells pretty bad. I have to clean it out about once a year. I can't figure out however why I'm the one going bald.

robertc65 is offline  
Old 10-31-2006, 06:59 PM   #6
New Guy
plumber jay's Avatar
Trade: plumbing
Join Date: Oct 2006
Posts: 27
Rewards Points: 25

Re: Sewer Odor In Upstairs Bathroom

Rob t
he hair probably isn't what smells bad. The hair is causing capillary action. This is the water in the trap travels up the hair into the waste line causing trap seal loss(hence the smell of sewer gas)


plumber jay is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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 Paint Problem - Strange Peeling firemike Painting & Finish Work 23 09-27-2007 06:53 PM
Sewer tie violation mdshunk Plumbing 10 07-04-2007 10:36 AM
bathroom requirements in small commercial retail? born2drv General Discussion 9 06-22-2007 09:19 PM
Sewer stub Moscow Plumbing 2 02-27-2007 04:18 PM
bathroom paint Traditions Painting & Finish Work 4 02-18-2007 09:43 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for

At we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?