Strange sewage smell coming from behind kitchen sink cupboard

[Steven Southern]

any help would be gratefully accepted. We’ve had a single storey extension to the rear with toilet. Now we have a strange sewage like odour coming from behind the kitchen sink but not this side of the trap. The sink waste along with the new bathroom waste all now go into the soil pipe which in turn is now enclosed in the extension. The soil stack is now a plastic one instead of a cast iron one which has a cap or air admittance valve on top. This has also been shortened by about 5 feet and no longer goes through the waves and onto the roof. There is also a new manhole which I haven’t checked if it’s blocked but I wouldn’t think so as it’s only weeks old. (I’ll lift the lid and check at the weekend) once again thanks for any help. Steve.

 

[Ben-gee]

Get the builder back. If it’s only just finished, could be s bung left in?

 

[Welder]

Get the builder back. If it’s only just finished, could be s bung left in?

Couuld be the the 'builders bodge' aka an AAV? Why oh why don't they do things properly and let the darn thing breath as designed...

 

[Steven Southern]

Thing is. We’ve also had the kitchen done and we didn’t notice the smell before. But there’s only 2 weeks difference in finishing times. Could it be the aav or kitchen fitter? Would A plumber be able to tell without ripping the plaster stud wall down to access the pipes?

 

[Steven Southern]

Thing is. We’ve also had the kitchen done and we didn’t notice the smell before. But there’s only 2 weeks difference in finishing times. Could it be the aav or kitchen fitter? Would A plumber be able to tell without ripping the plaster stud wall down to access the pipes?

Would I be able to remove the aav and leave it off without any problems? Like before it was fitted.

 

[Pickwickpick]

It could be the AAV, is it easily accessible?

 

[Steven Southern]

It could be the AAV, is it easily accessible?

Yes it’s on top of the new extension roof.

 

[Pickwickpick]

Although just re reading things, I take it the AAV isn't where the bad smell is noticeable? In which case its probably more likely to be something else, but without being out there its hard to say. A plumber should be able to narrow it down to a few possibilities but from what you've said about your setup I doubt they'll be able to confirm let alone fix it without some plasterboard being removed I'm afraid./

 

[Welder]

The point PW is that the AAV will not let foul gases out not that its faulty. The point of a soils stack is to let air both in AND out. If its blocked by a poxy AAV then it WILL come out elsewhere. End of.

If this were my place, then I'd simply take the thing off first. If the problem goes away then get the builder back to repipe it properly to 1m above the nearest opening window as the regs say. AAVs are a rubbish builders bodge.

 

[Steven Southern]

The point PW is that the AAV will not let foul gases out not that its faulty. The point of a soils stack is to let air both in AND out. If its blocked by a poxy AAV then it WILL come out elsewhere. End of.

If this were my place, then I'd simply take the thing off first. If the problem goes away then get the builder back to repipe it properly to 1m above the nearest opening window as the regs say. AAVs are a rubbish builders bodge.

Cheers I’ll remove that then as soon as I’m home. Then I suppose wait to see if the gases disperse.