Hello, I have a 100 year old three family townhouse. The cast iron waste stack runs up through a wall between the closet on each floor and the airshaft. Also running in this wall are the vents for the bathrooms and kitchens of each floor.
During renovation of the the top floor kitchen, a section of this wall was opened up to gain access to plumbing and to run new electric up from the basement.
Now that a section of that wall is open I can occassionally smell sewer gas.
I do not smell it in our bathroom (of course there is a bathroom and kitchen on each floor where the tenants live and I have not journey into their apts). I smell it in only in the wall.
Any suggestions on how to determine where the smell is coming from? How can I figure if it's coming from a hole/crack in the waste stack, or the vents?
Thanks for your help!
-Rogue Petunia