The back of my house faces directly west and there is nothing behind it except for fields and the Yorkshire Dales. When the wind blows from the west we get the most awful pong in the en-suite shower room. It is definitely the unmistakable smell of raw sewerage. The en-suite consists of a shower, sink and toilet. I don’t think the pong emanates from the toilet as there is water in the bowl. A bit of sniffing around (literally) suggests that the aroma is coming from the shower drain. The house was built in the late 1980s so has a single stack drainage system with the stack venting above the roof line.
The only explanation that I can come up with is that the wind blowing across the top of the vent pipe is somehow sucking the water out of the trap on the shower drain thus letting the smell of the sewers into the house.
Does this seem reasonable or is there another explanation? Regardless of the cause, is there anything I can do to prevent it. It really is an appalling smell.
Cheers
Dr P.
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