Soil stack vent - roof or air admittance valve

[DannylJohnson]

I completed the build on my house and moved in about 2 years ago. We have two bathrooms which have been functioning since then. On the left side of the house we have an ensuite which is vented through the roof. In the middle of the house we have a family bathroom which uses an AAV. We have a second ensuite on the right of the house which I am in the process of plumbing in. When we built the house we put all the drainage in place ready and just blocked them off, so at the moment we have a 4" soil pipe coming out of the floor where my toilet will be going. I have been told I need to vent it. My question is, can I use an AAV, or do I need to take it up through the roof to vent it?

Many thanks

Danny

 

[JohnD]

in my limited experience, AAVs eventually stick, and stink, which is especially tiresome when they have been boxed in and tiled over, so I would always go for an open vent above window level.

 

[denso13]

+1. AAVs have there uses but preferably fit an open vent.

 

[ALCPlumbing]

You only actually need one vent pipe on the property if they all link into the same drain. So you could get away with an AAV but obviously as stated running a proper vent is always preferrable. It must be either 900mm above the top any window opening within 3000mm or just 3000mm away from the nearest window/opening or air vent.