Are there any appreciable drawbacks to fitting an AAV rather than having an open vent pipe on a soil stack? Reason being.... the architect 'missed' the provision of a soil stack in our extension. I have worked out a way of including one, but it means a tortuous run of soil pipe through the roof void with a handful of elbows and a good 9m of pipe! Then I need to go through the roof with the vent... so it won't look great. This seems to be necessary as the roof has skylights fitted and trying to comply with building regs so the soil vent is at least 3m away from any opening within 900mm vertically means there are only a couple of places the vent can go.... all miles away from the stack!
Looking at it logically, the simplest solution is an AAV pretty much right on top of the soil stack in the en-suite... boxed into a cupboard and above the spill over level. The stack is taking 2xWC, 2Xshower, 2Xhand basin, 1Xbath for normal family use and feeds into the ground floor soil pipe taking 1xWC, washing machine, 2Xhand basins.... which then all run on to the manhole and main sewer. The vent pipe or AAV would be the only open vent to atmosphere for the whole lot.
Am I asking a lot of an AAV to serve this? and do they have any particular problems? or do you reckon it would be alright? It would sure save me a heck of a lot of work (and cost!).....
Looking at it logically, the simplest solution is an AAV pretty much right on top of the soil stack in the en-suite... boxed into a cupboard and above the spill over level. The stack is taking 2xWC, 2Xshower, 2Xhand basin, 1Xbath for normal family use and feeds into the ground floor soil pipe taking 1xWC, washing machine, 2Xhand basins.... which then all run on to the manhole and main sewer. The vent pipe or AAV would be the only open vent to atmosphere for the whole lot.
Am I asking a lot of an AAV to serve this? and do they have any particular problems? or do you reckon it would be alright? It would sure save me a heck of a lot of work (and cost!).....