Bathroom Smell

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4 Sep 2014
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Location
Lancashire
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United Kingdom
Just very recently we have been getting like an earthy smell in the bathroom, my wife also says its like an old brussel sprout smell. Thinking back, we have been getting this for a few months, a couple of months back my wife forgot to mention a smell like wet floorboards, that then went away. Some History.....
15yrs ago we had the bathroom redone, and a dodgy plumber simply cut off the soil stack under the bath, and removed the rest, and left the stack open. He denied all knowledge of this when challenged, and fitted some kind of rubber membrane to the top!!! 10 yrs ago, we had the bathroom completely ripped out and totally renovated, and the soil stack top was repaired, and an air admittance valve fitted. No issues since then, till now.
I've removed the bath panel and smell does appear to be coming from under the bath. (But as you know, this can be a red herring trying to trace smells!!) Its not particularly foul and certainly not eggy or the like, but very noticeable. Under the bath is bone dry.
Can anyone give any opinions, this morning the smell was barely noticeable, but seems worse if shower or sink being run. Do AAVs fail, and could this be the issue. If so, are they easy to replace?
I haven't checked under the manhole yet, to see if ive got a sewer blockage, but would that filter up to the bathroom?
Thanks in advance
 
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You need to check if its more smelly after the loo is "used" It could be the AAV if that is the case.
 
Smell appears to have gone!!. I have started to notice a gurgling noise from under the bath, when toilet flushed...is this normal. I wonder if the aav is intermittently sticking..... If anyone can help I'll post a photo of it as I've no idea which to buy.
 
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There is no outside pipework. The original stack was internal and boxed in. 1st plumber hacked it off under the bath, it did go from roof through bathroom and kitchen, to the external sewer. The plumber was never asked to cut it off
 
I could be wrong, but thought you still have to have a breather soil pipe outside, if you have an AAV inside, something to do with pressure.

If you can hear gurgling under the bath when flushing the look, perhaps this is the pressure trying to take the water out of the trap, once empty you get the smells.
 
Smell appears to have gone!!. I have started to notice a gurgling noise from under the bath, when toilet flushed...is this normal. I wonder if the aav is intermittently sticking..... If anyone can help I'll post a photo of it as I've no idea which to buy.

No it's not normal to gurgle, it is probably the AAV sticking.
 
Smell appears to have gone!!. I have started to notice a gurgling noise from under the bath, when toilet flushed...is this normal. I wonder if the aav is intermittently sticking..... If anyone can help I'll post a photo of it as I've no idea which to buy.
pic. will be good - and it may be possible to route a pipe through to outside and vent there. Meaning no aav needed.
 

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