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Discuss Smell from Kitchen Soil Stack! in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi,

Looking for some advice, I am getting a drain/sewage smell coming from my kitchen soil stack. It’s always been there since I moved in only a few months ago, I had a new kitchen put in and one thing I remember is the drain pipe got bashed about a bit when the kitchen was getting done.

The smell is definitely not coming from the sink trap, I am planning on opening up the boxing around the pipe this weekend to see if I can see if the connections are good.

If the connections are good I was planning on using some expanding foam and attempting to seal around the bottom of the pipe in case the smell is rising from the dwellings below, then siliconing the boxing up to try and prevent the smell. Is this a good idea?

I am on a top floor flat and there are two flats below me, I can’t see any blockages on the soil stack vent on the roof.

Any advice would be great?
 
Picture of boxing.

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Post a better picture of the way your washing machine waste is piped where does the grey flexible pipe go? Kop
 
Hi,
My washing machine waste go's into a connection on the sink waste and is secured tight with a clip. My washing machine is to the left of the above picture and my sink trap to the right.
 
Hi,

Looking for some advice, I am getting a drain/sewage smell coming from my kitchen soil stack. It’s always been there since I moved in only a few months ago, I had a new kitchen put in and one thing I remember is the drain pipe got bashed about a bit when the kitchen was getting done.

The smell is definitely not coming from the sink trap, I am planning on opening up the boxing around the pipe this weekend to see if I can see if the connections are good.

If the connections are good I was planning on using some expanding foam and attempting to seal around the bottom of the pipe in case the smell is rising from the dwellings below, then siliconing the boxing up to try and prevent the smell. Is this a good idea?

I am on a top floor flat and there are two flats below me, I can’t see any blockages on the soil stack vent on the roof.

Any advice would be great?
Guess removing the boxing is the start point but wouldn`t go using expanding foam as that is just masking the fault.
 
I get smells from time to time from our own home kitchen sink, food residue collects in a kink on the flexipipe between overflow and the waste. I have to remove it once in a while to flush out the rotten food particles.
 
Thanks for the reply’s I will see what’s going on inside the boxing this weekend.

I don’t think it is the WM waste pipe as the smell existed before WM was put in.

I don’t see any other option if connections are good other than to seal the around the pipe, don’t think neighbours would rip up kitchens for smell that’s only effecting me.
 
But you could seal all round it and still have a smell. Then you have a foamed up soil pipe and still no answer find the cause
 
I wouldn't try to seal the boxing up as you'd be masking a problem in your own flat, but I would definitely make your house airtight from other dwellings, and if that means (fire resistant grade) expanding foam around where the pipe passes through the floor, so be it.

In any case, there's surely no need for a large cavity for mice to run up, and to allow fire and fumes to pass from house to house?

At least if that doesn't cure the symptom, you'll know the fault is within your flat.
 
You could try giving it a through clean get some washing soda put a couple of cups in the sink and hot water mix well let the sink drain slowly via the sink plug this is user friendly and far less hazardous than acid based drain cleaners, a build up of food waste and washing machine gunk can cause these smells if this does not work then it a strip out and replace it job . cheers kop
 
even thought it's apparently not the issue here, you still need to make sure the WM pipe rises up above the sink overflow height before it falls to the trap connection, otherwise when you empty the sink the dirty water will stagnate in your washing machine sump.
Is it worse in certain wind conditions? If it's always constant it's something festering in your pipework, if it's affected by the wind it's coming through from the drains.
Agree with removing the boxing. If everything else is ruledout. There ould be a redundant connection not blocked off.
 
even thought it's apparently not the issue here, you still need to make sure the WM pipe rises up above the sink overflow height before it falls to the trap connection, otherwise when you empty the sink the dirty water will stagnate in your washing machine sump.
Is it worse in certain wind conditions? If it's always constant it's something festering in your pipework, if it's affected by the wind it's coming through from the drains.
Agree with removing the boxing. If everything else is ruledout. There ould be a redundant connection not blocked off.
Hi,
Not sure what you mean abot the WM waste and the sink overflow?
 
Ok, So I got into the boxing today and all is dry no leaks or anything.
Connections seem ok. It is drafty in there though?

IMG_3329.JPG


IMG_3336.JPG


IMG_3337.JPG


IMG_3338.JPG


IMG_3339.JPG
 
It looks to me like its from the washing machine as your connection is not looped high enough and is above the water trap letting the smelly water in your grey w/m pipe release to atmosphere. Also it could be the pic angle but pipe after trap looks like it goes up hill for a bit
 
Ok so been looking into this further, took off WM waste and DW waste and there was no smell.

When I opened up the boxing to the stack there was no smell.

But when I took a shower that go’s into a separate soil stack the smell returned from the kitchen stack?
 
assume you checked round the back for missing blanksb
Could be a hole in another floor that's blowing up through the gap. On a neighbour's floor you can let them know. But if you block the holes in the floor it would help
 
I looked at the blanks that I can see and they are sealed.
I am going to seal the base of the pipe with fire rated expanding foam to see if this reduces the smell.
 
I have now narrowed this now with testing.

Smell only occurs after running hot water down kitchen stack (I think the shower may have been a red herring).

Smell can occur randomly that’s make me think it’s when one of the dwellings below runs hot water.
 
Hot water will cause the goo in the pipework to release smells which should be contained within the pipework. You either have a design fault with the way the pipework has been made with the result that a trap is letting air through it, or the pipework is not airtight for some reason.
 
Worth letting the neighbour downstairs know there is a problem? Probably you'll now find the smell will now go into neighbour's house instead!
 
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