Smell from Kitchen Soil Stack!

[Diy592]

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?

 

[Diy592]

The smell is not constant.

 

[Belli]

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

 

[Diy592]

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?

 

[johnduffell]

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

 

[Diy592]

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.

 

[Diy592]

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.

 

[Ric2013]

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.

 

[Diy592]

Just an update, Smell much better/gone after foaming up around the base of the soil pipe. Thanks for advice.

 

[Ric2013]

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!