I have a bad sewer smell in my small bathroom. I got on the roof and dropped a garden hose down the vent it seemed unobstructed. I ran the water from the garden hose for quite a while and could hear it (from the crawl space) running out to the sewer and it did not backup. While I was in the crawl space I decided it would be a good idea to install a trap. See the following images:
I still have a sewer smell, even after installing a trap. I have since reset the toilet with new wax ring but still have the smell.
Ok, so now I notice the smell from my kitchen sink. It has a trap (as well as the toilet and sink in the bathroom). So, does that mean these are being emptied? Should I suspect a leak in the vent stack?