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Old 08-30-2010, 04:41 PM   #1
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Foul Bathroom Odor?


Hello all,

Just purchased my home recently (built in 2006). In mint condition all in all. Only problem is, once every few days or so one of the 2.5 bathrooms we have (upstairs, hallway area) has a 'foul' smell that lasts about a day. The strange thing is this, when it happens:

- toilet not used recently
- toilet very clean, including water
- toilet scrubbed, flushed a few times (odor still there)
- no leaks at all in floors, ceiling, toilet, etc.

What could it be? Its very odd because the other two BRs do not have this odor, ever. I'm new in the DIY field so please help me out. I've used cleaners like Lysol Disinfectant cleaner (the one with the blue squirt cap, blue liquid). The toilet is as white as you can imagine, so I'm baffled.

The water tank water is clear as well.

Thanks in advance.

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Old 08-30-2010, 10:18 PM   #2
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Foul Bathroom Odor?


I am certainly no plumbing expert, but you may have a venting problem where sewer gasses are backing up when the water in your P-traps fail to remain. Rather than tear apart your walls look into an air admittance valve (AAV).

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Old 08-30-2010, 11:19 PM   #3
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Foul Bathroom Odor?


Sorry, but where/what is the AAV?
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Old 08-31-2010, 05:53 PM   #4
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Foul Bathroom Odor?


Air admittance valves (AAV) are used instead of having to go out through your roof to add venting. See http://www.toolbase.org/Technology-I...ittance-valves

Do you know if your venting is adequate?
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Old 08-31-2010, 06:03 PM   #5
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Foul Bathroom Odor?


You might need to replace the wax ring under your toilet.

Here's a youtube video explaining how:
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Old 09-01-2010, 09:46 AM   #6
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Foul Bathroom Odor?


Can you better explain the smell? Could be hard to determine where it's coming from.

Have you checked the overflow in your lav sink? It can get sludged up with nasty residue from hair, toothpaste, whiskers, shaving cream, etc. that cause foul odors.

As far as an AAV; they're not legal or recommended in most cases, and it's probably not necessary. I'm assuming "built in 2006" everything is up to code and plumbed properly.

Do you notice the odors at times of low pressure (cold front)?

Are you on city sewer or septic? If you're on a septic system, when was it pumped last?

Are you on city water or a well?

Do you notice any smells in your water?

How about when the heat and/or AC is running?
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Old 09-01-2010, 10:26 AM   #7
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Foul Bathroom Odor?


If the odor persists, the problem may be a serious plumbing problem or the toilet seal may be broken. A hidden vent pipe may have cracked. A plumbing professional has the tools, equipment and know how to often quickly diagnose problems like this. Call a pro if you can't solve the odor problem.
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Old 09-04-2010, 06:27 PM   #8
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Foul Bathroom Odor?


Quote:
Originally Posted by LateralConcepts View Post
Can you better explain the smell? Could be hard to determine where it's coming from.

Have you checked the overflow in your lav sink? It can get sludged up with nasty residue from hair, toothpaste, whiskers, shaving cream, etc. that cause foul odors.

As far as an AAV; they're not legal or recommended in most cases, and it's probably not necessary. I'm assuming "built in 2006" everything is up to code and plumbed properly.

Do you notice the odors at times of low pressure (cold front)?

Are you on city sewer or septic? If you're on a septic system, when was it pumped last?

Are you on city water or a well?

Do you notice any smells in your water?

How about when the heat and/or AC is running?
The smell is not there all the time, only randomly. It smells moderately like "sewer", but not offensively as if someone just did their deeds so to speak. It just has that funky sewer smell but minimal, randomly.

Sink is fine, at least it doesn't clog up when water is turned on full blast and there is no odor there. Water in my home does not smell at all either.

Its city well, not water well. A/C is always on during this season since its been hot.

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