So the past few weeks there would be an occasional smell in the bathroom. After checking p traps and re-sealing my toilet I have discovered that my 4 inch exhaust pipe that connects to the main line has become disconnected in the wall. I went on the roof and shone a light down the pipe and can see it's not connected and misaligned.
I plan on calling a plumber but is there anything else they can do besides cutting my wall open and re-attach otherwise I will just do that myself.
Im really curious how this could even happen.
Edit - Thanks everyone. At this point I'm just happy to have found the source of the smell. Can't believe it took me so long to consider it. Looks like I will be opening my wall. Fun. #diy source