I'm living in a building of 6 floors, I'm at the 5th floor.
I made a full renovation to my apartment about 8 years.
Recently I began smelling a bad sewage smell from the bathroom (from drainage hole).
The thing I can't understand is how it's possible if I have a siphon that always keeps a high level of water such that it blocks the passageway of air…
It's driving me crazy and I don't know how to solve this issue.
Would appreciate a lot your advices,
Best Answer
If the building vent gets clogged, then waste falling through the common downpipe can suck water out of your U-bends/P-traps.
The solution is one of
Also, If you leave a sink/bath/shower unused for a month, the trap can dry-out by evaporation. This is mostly solved by pouring a litre of water down the unused sink/bath/shower once every few weeks. I read that some people add a layer of oil (maybe a tiny quantity of vegetable or mineral oil) to slow down evaporation.
Linked examples for illustration only, seek local equivalents.