My house is approximately 1 year old and I had it built myself. I
hired all the subs to do the work. Unfortunately, recently, I've
noticed an awful smell in and around the powder room. This smell is
only noticeable if it is raining outside. I thought a contractor may
have left me a "present" in a vent in that bathroom but the smell is
only noticeable when it rains. Can someone give me clue as what/where
this could be coming from? There's a pedestal sink and toilet in the
powder room. My HVAC & plumber contractor has gone belly-up so I
can't call him to come smell out the culprit.
Present could be in the stack pipe. Stack pipes are often straight
shots out open to the rain. Hop on the roof, hold your breath and
have a peek down.
But then again, if all your sinks and plumbing fixtures have P traps
and are vented to the stack no smell in teh stack should hit the
interior of the house. So much for that theory.
Only smells when it rains? Very odd. What does it smell like?
Sewage/rotten eggs? Musty/moldy?
Sewer gas can back up if a sink or tub is not used often and water in
the trap dries up. Construction worker left his lunch on a rafter in
We had this same problem in our house -- yes, the smell is awful.
Turned out to be septic gases backing up. Our septic tank was full and
the gases had no where to go but back up into the bathroom. The vent in
the yard was blocked as well. After we had the tank pumped out - no
My wife complains of a similar problem, rain or shine. Seems to happen
about 6:30 every morning
I'd still guess a blockage someplace. Traps should stop it, but if there is
a pressure buildup it may be possible to force some gasses through. Could
even be a combination of blocked vent and overfilled septic. Is it
possible that rain is getting into the septic system and overfilling it?
If you have town sewer, disregard suggestions above.
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