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Old 11-21-2006, 12:57 AM   #1
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Waste pipe odor in garage?


I have recently pulled all the drywall in my garage ceiling and walls due to a rodent infestation. Much of the upstairs plumbing is now exposed, including the waste pipes for two toilets, a tub, shower and three sinks. The main waste line comes down a now open wall before exiting into the crawlspace. I mention all this because there is a distinct toilet odor in the garage and I am convinced it is coming from a crack or hole in a waste/ vent line. It does not smell like like septic effluent or what I think of when I think of sewage odor, it smells just an outhouse or a around a leaky toilet flange. It is definitely human, not rodent or cat. I suppose it could be a leaking flange, but we reseated the toilets a couple of months ago (because they were loose - but no obvious signs of leaking when we pulled them) and I see no water staining under the subfloor presently.

I have only owned the house for three months, so I do not know how long the odor has persisted.

How can I figure out where the odor is coming from/ if there is a crack or leak in a line? If I call a plumber, will this be a long expensive process? I am needing to close up the drywall in two weeks, so it's now or never. I definitely don't want to close up septic gas in the walls/ house.

Thanks for any advice you can give me.

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Old 11-21-2006, 07:02 AM   #2
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Waste pipe odor in garage?


You have a hole somewhere, allowing venting into your garage. If you can't see an obvious problem, then you really should call a plumber...it should not be a big job to locate this, but if let go, could have health issues as well as making your house unlivable.

My neighbors had a persisitant sewage (outhouse) smell in their house...just a creep in kind of smell....turns out a cast iron pipe behind a toilet (vent stack) has a rust through hole in it....no big deal, but on windy days, the air would come down the vent (slight pressure) and the house would stink.

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Old 11-21-2006, 01:04 PM   #3
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Waste pipe odor in garage?


Thanks joasis.

Can you or anyone else tell me what is involved in investigating the leak? Are we talking about a smoke test? vbmenu_register("postmenu_24327", true);
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Old 11-21-2006, 01:07 PM   #4
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Waste pipe odor in garage?


Smoke is the correct way, and a plumber will have the stuff to do it with.
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