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From a few posts back...Basement bathroom has had a smell since we bought the house early last year. I had identified and fixed a leaky shower that was above a basement bathroom. Leaky shower drain had likely been leaking water into the space between the upstairs floor and basement ceiling for some time. Leak fixed and I used an ozone generator in the bathroom which mostly got rid of the smell. That is.. until you turned on the bathroom exhaust fan with the bathroom door shut, then the small came back. I noticed the smell was coming from the light switch so what was happening was the exhaust fan creating a slight vacuum in the bathroom and sucking the stinky air from inside the wall through the light switch opening..
The light switch is now sealed from the inside wall smell with expansive foam so the bathroom no longer smells.
Remember I had to cut about a one square foot opening in the basement ceiling drywall because it was damaged by the leaky shower drain. This is also allowing fresh air into the inside wall area that stinks, of course its also allowing the stink to come out through this hole in the ceiling..
The whole issue seems to have been caused by the leaky shower drain above the basement bathroom.
The good news now is that just allowing a fairly good flow of fresh air into the wall and celling area has also improved things dramatically.
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