Funky smell in spare bathroom - any ideas?

We've constantly got a funky/foul smell in our spare bath room. It's a kind of mouldy/not right smell rather than smelling purely of sh%$te. I've ruled out any leaking pipes/mould issues anywhere as we recently replaced the sanitary ware/shower etc and the smell was there both before and after!



The two top windows you see in the photo are our two bathrooms. The large pipe is the soil pipe that takes the waste from the two toilets. It goes down through our conservatory and down into the main drain. The bathroom on the right is the one with the funk. The smaller pipes take the used water form the bath/sinks/shower etc.

I'm thinking it might be an issue with the foul smell coming up the pipes and reaching the highest point which might be our spare bathroom. I guess my question would be shouldn't the ubends stop any smell entering the room?

Any ideas what might be causing it?

Can we see the rest of that stack please, and does it go upward above that conservatory?

As far as i can see it doesn't go any higher.

Incidentally quite often when we have a shower in the sink drains gurgle when the water drains out of the shower?!?

Where else should I be looking?

You need a vent on the main soil pipe, having the smaller waste pipe tee into each may not be good. They are best to connect to the main soil pipe separately.

Have you got a drain inspection hatch in your conservatory? It could be blocked under there.

You need to 'get down my man' and ¶ 'Place that funky loo sh*t' ¶

sloppytom said:

You need a vent on the main soil pipe, having the smaller waste pipe tee into each may not be good. They are best to connect to the main soil pipe separately.

Click to expand...

You might get away with changing every trap for a Hep V O waste valve

My money's on the two holes at the top-right of the photo (next to the window) being where a stack pipe used to be until some nitwit installed a conservatory.

Gurgling is letting air in, sucking through the trap in the sink. If that's leaving an air gap then you're going to get smells. In the short-term you can most cheaply try a different trap with an air admittance valve, or go as Nige says.

Long term I'd get that stack sorted.