Venting a soil stack

[neilinbal]

Hi everyone
I have an internal soil stack that is creating a bad smell. The stack goes up in a small room near kitchen & ends through floor in bathroom directly into toilet. It is not vented anywhere. I have no room to bring it up in the bathroom to put an air admittance valve on. Can anyone tell me best way to go about it? That's if I need to at all. Cheers here's a photo of what I have. Right hand wall is an outside wall.

 

[denso13]

How is it causing a smell? Is it pulling (emptying) any traps?

 

[Ian H]

You could swap that bend for a T and fit an air admittance valve on it.

First though, I'd smoke test it to see where the smell is escaping from.

 

[TicTac]

If you have a smell on that section, then it's from a leak, but you'd see it. If it's going up through the floor, and then connecting to the toilet, then is the vent outside by any chance. If there is no vent anywhere, then there may me a weak seal that the bad smells are being pushed out of as the toilet flushes. Can you take connect a 40mm pipe off of a boss, take it up into the loft, and then fit an AAV on it up there.

 

[Nige F]

Like denso says - with those wastes as they are it's most likely to be pulling their traps

 

[John D v2.0]

Like denso says - with those wastes as they are it's most likely to be pulling their traps

Agreed, shouldn't have a branch connection within 750mm of an offset. And that offset would have been better made with 45s or less rather than 90s.