boxed in air admittance valve

[mitchino]

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?

 

[ShaunCorbs]

I would leave it as is (going through the roof) as it might effect other properties if you change it

 

[mitchino]

Our property is detached, nearest neighbour 500m away.

 

[ShaunCorbs]

Do you have any other drain vents going through the roof ?

 

[mitchino]

No only that one soil pipe

 

[ShaunCorbs]

Need to keep it as is then sorry to say

 

[mitchino]

can you explain why?

 

[ShaunCorbs]

can you explain why?

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

 

[mitchino]

thanks for explaining!

 

[ShaunCorbs]

One thing that you could do is reduce the vent down to 2” if you really need to adjust/ the space