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New House- Sewer Gas Smell in Bathroom

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New House- Sewer Gas Smell in Bathroom

Old 10-05-2020, 03:56 PM
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Default New House- Sewer Gas Smell in Bathroom

The master bathroom of our new house smells of sewer gas, not all the time but most.

One story house on a slab.

Traps at the sinks, can see water in shower drain trap.

General contractor trying to get installing plumber back to investigate, slow.

Any thoughts on how this could happen? How does the gas get by the traps?

Maybe a design or installation problem with vent stacks?

Thanks.
Old 10-05-2020, 03:57 PM
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No or not enough wax ring under toilet could cause that
Old 10-05-2020, 04:09 PM
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Have them smoke the sewer pipes. Install plug at city sewer lateral, drop in smoke bomb, house side of plug. Your leak will show up quickly. Flush a toilet or use sink to extinguish the bomb and remove plug.
Old 10-05-2020, 04:09 PM
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Default Sewer gas

Originally Posted by VesselCalling View Post
No or not enough wax ring under toilet could cause that
Is it possible they used a studor vent?
look under vanity to see if visible but would not be 1st time someone installed one and was sheetrocked over With no access
They are cheap and can fail when fairly new
Old 10-05-2020, 04:10 PM
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Originally Posted by VesselCalling View Post
No or not enough wax ring under toilet could cause that
That is my guess, or a vent blocked by a birds nest.
Old 10-05-2020, 04:17 PM
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Roof vent clogged or not properly installed.
Old 10-05-2020, 04:49 PM
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Are any vents in exterior walls? If vent isn’t in exterior wall what type of construction, block or frame.
Old 10-05-2020, 04:55 PM
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Brand new house or new to you house? If brand new and on public sewage were the traps ever filled with water to block sewer gas from entering the house?
Old 10-05-2020, 06:32 PM
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Thanks all for replies.

New construction, 3 months old.

No studor vents.

Good idea to check toilet wax.

Didn't know about smoke test, I'll check on that too.

Old 10-05-2020, 06:43 PM
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Originally Posted by millennium View Post
Thanks all for replies.

New construction, 3 months old.

No studor vents.

Good idea to check toilet wax.

Didn't know about smoke test, I'll check on that too.
More common in commercial bath rooms with floor drains but make sure all your traps have plenty of fresh water in them. Pour a five gallon bucket of water with a tablespoon of bleach in it down every drain. If it is a new house and you have a drain that has not been used (like a shower in the guest bathroom) gas is backing up through an empty pee trap.
Old 10-05-2020, 06:51 PM
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Toilet wax ring. I had it happen to me.
Old 10-05-2020, 07:02 PM
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Is there a drain tub or shower you aren’t using enough? Had similar issue was tub w never use and p trap evaporated over weeks and AC drawing water over time from air.
Ran it weeks issue gone
Old 10-05-2020, 07:21 PM
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Originally Posted by Slimshady04 View Post
Have them smoke the sewer pipes. Install plug at city sewer lateral, drop in smoke bomb, house side of plug. Your leak will show up quickly. Flush a toilet or use sink to extinguish the bomb and remove plug.
a smoke bomb won’t do anything but waste your time. You need a professional nota house plumber to use a hurricane smoke machine and force smoke in from a clean out. You’ll find your problem then. It could be a vent that was never properly joined and has come apart or it could be a cut partially through a vent or waste stack. Could be nails in the vent from the dry Wall installer. The toilet flange mya be too low for a proper seal or it could be a number of problems. A smoke bomb won’t do anything as far as finding the smell.
Old 10-05-2020, 07:30 PM
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Originally Posted by wangotango321 View Post
Is there a drain tub or shower you aren’t using enough? Had similar issue was tub w never use and p trap evaporated over weeks and AC drawing water over time from air.
Ran it weeks issue gone
had a similar issue, shower in guest area that didn't get used often was the problem, run water from time to time, no issue now.....if your smell is intermittent, might consider that
Old 10-05-2020, 07:38 PM
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Wax ring. Had it happen, couldn't figure out where it was coming from until I lifted the toilet, even then it wasn't obvious. Tile floor, went back with the extra thick ring, no more trouble.
Old 10-05-2020, 07:44 PM
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I know codes in our area require nail plates over all plumbing. No idea if that’s national code, I’m not a plumber.

But when our house was built I saw them everywhere. Drywall nail or screw seems less likely. I did find tons of trash all over my house; in floor vents, air returns, etc. perhaps a vent is clogged...check roof vent if you can, or attic, and make sure you see it coming up and running out. You say it’s only sometimes, could also be environmental, like wind. My first house had a weird issue where wind circulated in the back yard and would have enough force to lift the little spring loaded door for the ceiling fan vent. If it was raining, it would then rain in my bathroom. I had to move that roof vent to the front of my house and was never an issue again.

Old 10-05-2020, 07:54 PM
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Originally Posted by Slimshady04 View Post
Have them smoke the sewer pipes. Install plug at city sewer lateral, drop in smoke bomb, house side of plug. Your leak will show up quickly. Flush a toilet or use sink to extinguish the bomb and remove plug.

Here ya go. Fast, easy test. Go from there. Dis shouldn’t be difficult either. May just have a dry trap somewhere.
Old 10-05-2020, 07:56 PM
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Try pouring water down each drain first. That's a pretty cheap first step.
Old 10-05-2020, 07:57 PM
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Originally Posted by JRCasey View Post
a smoke bomb won’t do anything but waste your time. You need a professional nota house plumber to use a hurricane smoke machine and force smoke in from a clean out. You’ll find your problem then. It could be a vent that was never properly joined and has come apart or it could be a cut partially through a vent or waste stack. Could be nails in the vent from the dry Wall installer. The toilet flange mya be too low for a proper seal or it could be a number of problems. A smoke bomb won’t do anything as far as finding the smell.

Smoke test...some guys refer to it as a smoke bomb. Bottom line, as said here too, SMOKE TEST! Fast answer!
Old 10-05-2020, 08:17 PM
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Occam's razor. 2 nuts, 1 waterline. Pick up the toilet and you'll find the installer assed up the wax ring. <$5 fix, you'd be done by now.

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