Hi
I have this issue in my house where the main bathroom upstairs, and the downstairs toilet, both have a strange unpleasant smell, I'm assuming sewer-y. The en-suite is fine, although the previous owners did some dodgy renovation and behind the vanity unit is a massive hole in the wall into the cavity where I'm assuming the old toilets waste that was there went into, and it does have an odd smell coming from there but it smells different. They are in different soil stacks - the en-suite and the downstairs toilet share one, and the main bathroom is on its own. I have changed both AAVs in the loft as a precaution but no difference. All drains have been cleaned and I cannot find any evidence of any traps evaporating. It's one of those ones where the smell isn't consistent, sometimes it doesn't smell sometimes it's strong, and I cannot locate a single source of smell by sniffing various areas, it just builds up in the rooms.
One thing I have noticed in the main bathroom is when the toilet is "used", you can hear the water that is being displaced from the trap running in I'm assuming a pipe either behind a wall or under the bath - is that normal? Does that indicate there is an air leak somewhere meaning you can hear it, and is also letting the smell out with it?
Does anyone have any ideas? It seems too coincidental to have 2 bathrooms sharing the same issue, but they are on totally seperate stacks so not sure how else it can be related? I am by no means a plumber..
I have this issue in my house where the main bathroom upstairs, and the downstairs toilet, both have a strange unpleasant smell, I'm assuming sewer-y. The en-suite is fine, although the previous owners did some dodgy renovation and behind the vanity unit is a massive hole in the wall into the cavity where I'm assuming the old toilets waste that was there went into, and it does have an odd smell coming from there but it smells different. They are in different soil stacks - the en-suite and the downstairs toilet share one, and the main bathroom is on its own. I have changed both AAVs in the loft as a precaution but no difference. All drains have been cleaned and I cannot find any evidence of any traps evaporating. It's one of those ones where the smell isn't consistent, sometimes it doesn't smell sometimes it's strong, and I cannot locate a single source of smell by sniffing various areas, it just builds up in the rooms.
One thing I have noticed in the main bathroom is when the toilet is "used", you can hear the water that is being displaced from the trap running in I'm assuming a pipe either behind a wall or under the bath - is that normal? Does that indicate there is an air leak somewhere meaning you can hear it, and is also letting the smell out with it?
Does anyone have any ideas? It seems too coincidental to have 2 bathrooms sharing the same issue, but they are on totally seperate stacks so not sure how else it can be related? I am by no means a plumber..
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