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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I would leave it as is (going through the roof) as it might effect other properties if you change it
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Do you have any other drain vents going through the roof ?
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Need to keep it as is then sorry to say
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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
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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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