Height of an Air Admittance Valve in a bathroom

[Paul Cockhill]

Hi Everyone

I am fitting an air admittance valve to a stack pipe in a bathroom, see pictures. A separate washbasin waste pipe and bath waste pipe are also connecting to the soil pipe.

I have fitted an anti syphon trap to the washbasin and a HepVo to the bath

My question is
Is there a minimum height the AAV has to be in the bathroom?

My clients want it as low as possible and boxed in. I know once it is boxed in there will have to be an air grill

Any advice greatly appreciated

Best wishes

Paul

 

[JVTrades]

I think you’ll find that technically it needs to be at least 600mm above the highest spill over point which is normally the basin. With air admittance on other appliances though it will probably be fine although there are other details about the property and any other facilities that need to be known to be sure

 

[Sharp Point]

It has to be above the highest level of appliances in bathroom.... usually the basin. I always put mine a metre off the floor.

 

[king of pipes]

Needs to be above the basin height . Kop

 

[chris watkins]

It has to be above the highest level of appliances in bathroom.. usually the basin. I always put mine a metre off the floor.

Why ?
If it blocks the water will overspill the Pan not the basin.

 

[chris watkins]

I just don't understand where all this requirement for costly waterless & anti-vac traps is coming from?
If this stub is on the ground floor it doesn't need the Durgo.

 

[Welder]

TBH Chris it's not for us to decide really. The OP had had BCO out so what they say goes. We know they may not know what they are about, but we can't argue as we're not there.

On a personal level I'd not fit one - if the lengths are as they appear!

 

[king of pipes]

Why ?
If it blocks the water will overspill the Pan not the basin.

Building regs Chris - my interpretation is if you have a sewerage back up you may not notice a boxed low fitted air addmitance valve leaking but a overspill from the toilet or basin will show immediately the valves should be visable and removable for maintenance above the spill over level for rodding access if its needed whether we agree or not we should all be fitting to the regulations . Cheers kop

 

[Paul Cockhill]

Hi Everyone
Many thanks for your reply. The bathroom is on the first floor and as I mentioned it has an anti syphon trap on the washbasin trap and an Hepvo to the bath

 

[Paul Cockhill]

I think you’ll find that technically it needs to be at least 600mm above the highest spill over point which is normally the basin. With air admittance on other appliances though it will probably be fine although there are other details about the property and any other facilities that need to be known to be sure

Thanks for your reply. Does it matter that it is on the first floor and the bath, washbasin and WC are the only pipes running to this soil pipe

Thanks Paul