Hi there,

Any experiences with air admittance valves?

I'm refurbishing my bathroom.
At the moment the stack pipe takes air from the outside (the roof), and this means that I have a column in a corner of my bathroom.
To save space, and why not to improve insulation, I would like to cut my stack pipe halfway (say at basin overflow level) and close it with an air admittance valve on top.
What do you think?

Also, what's the position of building control about this? Is this stuff regulated?
I'll ask them tomorrow, but BC in my council tends to answer very randomly. So I guess if I get an answer I don't like I'll try again

Cheers,
Julian