Hello,
I'm embarking on a project to reduce the soil vent pipe size if at all possible.
The 110mm vent pipe runs from downstairs wc to bathroom then up through the bathroom>loft then out of the roof.
I want to reduce the diameter of the pipe and reroute it the boxing in will be less unsiightly
Can I reduce the diameter or fit aav or durgo to remove the need? I don't think I can but thought someone on here may know?
Thanks