Soil and vent pipe query?

[macka09]

Hi all. I'm struggling for inspiration on a very small bathroom. One of the issues is that the soil pipe goes straight up the middle of one of the walls. My question is, can a AAV be used on the main stack to a house? I've always thought it's a no no but I'm being told other wise. Any afvice would be great thanks.

 

[Scott_D]

Could you set over at low level and run up in the corner of the room?

 

[macka09]

Could you set over at low level and run up in the corner of the room?

I could do that if I'm honest but also trying to limit the amount of boxing. I'll add a couple of photos for reference.

 

[Riley]

Could you take it to outside?

 

[macka09]

Could you take it to outside?

Unfortunately not mate. It comes up from a downstairs toilet and if I go out where the tee is, it'll be inside a pitched roof.

 

[Dkdc71]

If you reduced down to 50 mm pipe in the bathroom and reconnect to 100 mm in attic space wouldn't use an aav there on the main vent