Height of an Air Admittance Valve in a bathroom

[chris watkins]

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

Totally agree kop with the pan but does not need to be above the basin, on this one.
1. Water finds its own level so if the stack blocked & you were silly enough to carry on using the basin it would over still the pan.
2. OP has fitted an anti-syphon trap to the basin which is below the overspill of the basin which is one of the reasons I don't like them.

 

[Sharp Point]

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.

Actually, that’s not quite true. The idea of the AAV is to prevent either negative or positive pre

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

Not if it’s on the ground floor and vermin control flaps have been or anti flood valves.
Maybe the requirement is a ‘ one fit for all’ type.

 

[chris watkins]

Actually, that’s not quite true. The idea of the AAV is to prevent either negative or positive pre

I don't think you quite understand how a Durgo works they can only prevent negative pressures by opening to allow air in. They can't no positive otherwise the foul smells would come out.

Not if it’s on the ground floor and vermin control flaps have been or anti flood valves.
Maybe the requirement is a ‘ one fit for all’ type.

If it is a stub stack (i.e. on the ground floor) it wouldn't need one anyway (unless the drain was deep)
Sorry don't understand
"Maybe the requirement is a ‘ one fit for all’ type" can you explain ?

 

[Welder]

Is it me?
I find it quite depressing that something as basic as a AAV is so misunderstood. That said, I suppose if you don't do 'wet' plumbing you are less likely to need to know...

 

[Sharp Point]

I don't think you quite understand how a Durgo work

Oh, okay then.

 

[Sharp Point]

I don't think you quite understand how a Durgo works

If you look at my sentence, it stops mid way... as I realised what I was typing was incorrect. I was quoting one of your posts.... ooops

 

[Sharp Point]

If it is a stub stack (i.e. on the ground floor) it wouldn't need one anyway (unless the drain was deep)

What’s not needed, a vermin trap or anti flood valve or stub stack

 

[dan_the_plumber]

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

It depends where the blockage is though. If the pipe blocks between the toilet height and the basin height, then the basin will over flow

 

[dan_the_plumber]

Totally agree kop with the pan but does not need to be above the basin, on this one.
1. Water finds its own level so if the stack blocked & you were silly enough to carry on using the basin it would over still the pan.
2. OP has fitted an anti-syphon trap to the basin which is below the overspill of the basin which is one of the reasons I don't like them.

On point 1. It depends where the blockage is. If the pipe blocks between toilet and basin, the basin will overflow

 

[chris watkins]

It depends where the blockage is though. If the pipe blocks between the toilet height and the basin height, then the basin will over flow

On point 1. It depends where the blockage is. If the pipe blocks between toilet and basin, the basin will overflow

So you have seen lots of 100mm vertical stacks block then have you dan?