Plumbing Question

Sewer smell in bathroom

Hi, I have a downstairs bathroom in my house and have a really bad sewer smell. My house is quite old and as far as I am aware there is no soil stack pipe. It happened in the past and I stuck some sealant round the cuff bit at the back where the toilet bowl goes into the pipe and it seemed to work ok. There are no leaks. I have had a guy out today to have a look and he wants to carry out a drain survey. There are no manholes in my garden and I have not had any smells in the garden which is the other side of the wall from the bathroom. Any suggestions would be appreciated thanks

1 Answer

Best Answer

Hi Emma,

All of the u-bends in your home are there to stop sewer gases coming in to the home. The "U" needs to be full of water to "seal" to achieve this. The toilet is easy to see if this is the case, have you looked at the sink/shower U bend to make sure that they are also functional. the other area to look at are the pipes from the U-bend to the sewer where you can see them. Any poor seals on any of the pipes will allow sewer gasses into the home.

That is the easy checks over I'm afraid.

If you are comfortable that everything is okay then the only other possibility is that the pipes have broken/lost seal out of sight, allowing the gasses to seep into the living space. In a room this will be noticeable, outside maybe not purely due to the amount of air exchange. A drain survey will locate the problem if this is the case.

A stench (soil) pipe is used to avoid pressure problems when flushing that could suck all of the water from other u-bends, this may be an issue with your home, a good plumber will be able to advise. This may be happening in your downstairs bathroom if the sink is plumbed into the soil pipe. Take a look here, this shows an internal soil pipe that will help if this is the case.

Hope this helps

Answered 11th Oct 2013


Member since 4 Oct 2013

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