Moving a toilet with an AAV on a floor-exiting soil pipe

[Rahaaas]

Hi all,

Picture available here:

https://www.dropbox.com/s/l3k899oghtfbuad/IMG_1414s.jpg?dl=0

I'd like to replace this toilet with a close-coupled unit further to the right (so I can actually open the door...), while reducing the boxwork (particularly on the left hand side) as much as possible. Low-level boxwork on the right is inevitable, I suspect, keen to avoid building a false wall / large cabinet.

The wastes come from the high-level cistern, bath (just to the right, out of picture) and sink. It's in the basement floor of a 5-storey Georgian conversion, and can't be externally vented directly. The soil pipe runs about 15ft to an inspection cover that serves the rest of the building, and that IS externally vented.

Question is, can I get a toilet running straight down into the soil pipe, and run an AAV off to the right (even under the bath void), running the wastes in there too? Or can the toilet go on the right of the soil pipe, swan-neck in, and connect to the AAV running off to the right?

Assuming I can't dispense with this big stack and use discrete AAVs on the bath and sink wastes, right..?

There's some reticence (understandably) from our installer to chase into the concrete floor / very thick wall, or dig around the soil pipe itself.

Thanks for reading... suggestions gratefully welcomed!

 

[brum]

Cannae see any picture mate..brum

 

[Rahaaas]

Sorry, yes - for some reason I'm not allowed to embed a picture.

Here's a download link: https://www.dropbox.com/s/l3k899oghtfbuad/IMG_1414s.jpg?dl=0

 

[PhoenixServices]

The wastes come from the high-level cistern, bath (just to the right, out of picture) and sink. It's in a 5-storey Georgian conversion, and the stack is about 15ft from an inspection cover that leads off to an externally vented stink pipe. There's no way to externally vent this installation as it's in the basement!

i don't understand this bit, your saying the stack is vented outside then in the same sentence you can't vent it.

 

[Rahaaas]

Sorry if that isn't clear. I know that the soil pip runs through our flat, to an inspection cover in our garden. A few feet from there, there's a vent pipe running up the side of the house, above the roofline. So my assumption is that there is a vent from the sewer, but this particular soil pipe isn't directly vented. From what I can gather, this may mean we can dispense with the big AAC and use small 'auxiliary' AAVs on the bath / sink traps, as the sewer is vented as part of a larger system...