I'm renovating our upstairs bathroom. At the moment the soil stack is boxed in a corner within the room and exits straight through the roof. I was reading up on air admittance valves and I believe the regs say it has to be more than 200mm above the highest point of entry to the soil pipe. So I was wondering whether I can have a much shorter stack within the room, boxed in with a shelf on top?
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View the thread, titled "boxed in air admittance valve" which is posted in Air Sourced Heat Pumps Advice Forum on UK Plumbers Forums.
I would leave it as is (going through the roof) as it might effect other properties if you change it
Do you have any other drain vents going through the roof ?
Need to keep it as is then sorry to say
because you need atleast one stack vented
So if you have two vents you can get rid of one and install a dirgo on it
One thing that you could do is reduce the vent down to 2” if you really need to adjust/ the space
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