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Discuss New build house smell in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Messages
48
Hi, we just moved to a new build. There is a dreadful 'sewer' smell in the house. No outside soil stack. AAV is sited behind bath panel in family bathroom upstairs. Had this replaced as plumber thought may be faulty, no change in smell. We are one of three houses and there is a joint pump station to the main sewer. There doesn't appear to be a vent on the pumping station, should there be? I have read advice and put all the plugs in downstairs sinks and covered with water to form a seal. This does seem to have stopped smell but obviously not answer to problem. Can't get builder to take notice! PLEASE can anyone advise what the problem could be.
 

king of pipes

Esteemed
Plumber
Gas Engineer
Messages
4,921
Very hard to say without seeing the job is your drainage free flowing ? Any problems with toilets flushing ? Bath water emptying? Have the external drainage covers been lifted to look for blockages ?
 
Messages
550
Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.
 
R

ROGER12345

Very hard to say without seeing the job is your drainage free flowing ? Any problems with toilets flushing ? Bath water emptying? Have the external drainage covers been lifted to look for blockages ?
Thanks, yes drain covers have lifted and no blockage. Water/toilets drains freely and not slow.
 
R

ROGER12345

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.
Thanks, we have plugged all sinks, opened one by one and it seems to be the kitchen sink that's the fault. That does have a small AAV attached to it since the problem started but didn't stop smell.
 

Ric2013

Plumber
Messages
2,958
Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.
Agreed. Then get plumber to replace the trap on that sink or washbasin with an air inlet or resealing trap. Could be a DIY job if you're handy.
 
R

ROGER12345

Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.
Hi, just to add. We didn't block the overflows but it (so far) has stopped the smell by plugging sink and leaving water in sink. Seems to be kitchen sink. Have unplugged utilities and downstairs toilet sinks.
 
R

ROGER12345

Agreed. Then get plumber to replace the trap on that sink or washbasin with an air inlet or resealing trap. Could be a DIY job if you're handy.
Thank you, he did put a small AAV on under sink but that didn't stop smell. Do you think a resealing trap would do better? Also our next door neighbour has same smell in family bathroom, do you think it could be connected as they were built at same time, only months ago?
 
Messages
48
Very hard to say without seeing the job is your drainage free flowing ? Any problems with toilets flushing ? Bath water emptying? Have the external drainage covers been lifted to look for blockages ?
Hi, I have replied but unsure if its on here...Drains checked & water free running.
 
Messages
48
Might be a design fault where the water is being sucked out of a trap somewhere,
Block overflow and put plug in one item at a time to try and isolate which it may be.
Replied but not shown....New to this! Did as you said but not covered overflows. The kitchen sink seems to be culprit. Plumber did put a small AAV ON but smell continued. It has a u bend (p trap?) Should I change that to an actual trap one?
 
Messages
48
Agreed. Then get plumber to replace the trap on that sink or washbasin with an air inlet or resealing trap. Could be a DIY job if you're handy.
Plumber did put a small AAV on but that didn't stop smell. The u bend doesn't have a trap as such on, should I change to one with a convential trap?
 

Ric2013

Plumber
Messages
2,958
Replied but not shown....New to this! Did as you said but not covered overflows. The kitchen sink seems to be culprit. Plumber did put a small AAV ON but smell continued. It has a u bend (p trap?) Should I change that to an actual trap one?
A (U bend) P trap IS a trap! So what do you mean by a conventional trap?

I was going to mention overflows, but you stated use of plugs had stopped the smell. So my guess in the dark is that it's something that doesn't have an overflow.

Can't you use your nose to smell the plugholes and overflows to find the source of the problem?

Failing that, if you're still stuck, pictures of your undersink plumbing might show something interesting...
 
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