Does anyone ran into a defect analysis inspection for a villa where the occupants complain from a bad sewage odor coming in and out every few days? It is not continuous but rather comes and go.
I went today and here are some facts that might give more insight:
The smell always appearing in the Master bedroom/bathroom and it usually starts when they turn the AC on. Stays for 10 minutes then disappear.
All water closets/fixtures are regularly used, so no dry traps
The two sinks in the master bathroom doesn’t have P-Trap installed. It is a “Cup” style and the plumber that did the installation is arguing that they do not need a P-Trap as the floor drain has one?
The vents pipes are extending well above roof surface and is way far from the exhaust fan pipe
The basement “in the garage” has a room where the sewage manhole exist. When you open the door, you kind of smell the same odor.
Does this give any new insight o what can this be? Could the vent pipes be leaking somewhere into the walls? Will a smoke test help confirm that?
Any help is appreciated.
I’ll also post the same in the “general inspection” section to expand the ideas.