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Discuss AAV on Soil Pipe within a room in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi Im looking to use an Aav to terminate a soil Pipe within a Wall Ive read up and spoken to Manufacturers ( Polypipe ) and they say as long as it has Vent / Grill over it for air flow its ok I know the requirements regarding its height etc it will however be in a habitable room ( Bedroom ) and although they don't advise it they don't say you cant do it,... its for a Loft conversion im just wondering if any of you Guys and Girls have done it in a loft conversion and Building control had excepted it, the alternative is to exit it up through the roof just trying to avoid potential failings after time
 
If you take the vent up through the roof then you can leave the vent open to atmosphere and there should be ho failings over time.
 
If you take the vent up through the roof then you can leave the vent open to atmosphere and there should be ho failings over time.
hi the failing I was on about was going through the roof around where the pipe exits the roof if theres no hole there in the first place 0 chance of leaks that's why im considering the Aav
Cheers
 
The risk of the AAV failing is greater than the roof flashing failing, if done correctly.
Although a failed AAV would be easier to fix.
 
The risk of the AAV failing is greater than the roof flashing failing, if done correctly.
Although a failed AAV would be easier to fix.
That's what I was thinking changing the Aav,s a simple process plus I'm going to the trouble of concealing the soil pipe ( purely aesthetics) my existing Soil pipe is an old cast iron which I've away hated looks crap

image.jpg
 
The main thing I was after in my initial post was " would building control allow it " ( Conseald ) if not only option would be through the roof
 
You also do not quite understand the pipes function.

The pipe not only lets air in (to stop it collapsing) but it also needs to vent foul gasses to atmosphere. That's the point of 1m above local opening window. If you remove the ability to vent as designed then it WILL still vent. However it will do so directly into your bathroom. Not only a potential health hazard, but worst of all a never ending moaning from the significant other...
The very minimum to vent should be 2" and make sure yiu have no 90 deg bends, 45 degs max.
 
You also do not quite understand the pipes function.

The pipe not only lets air in (to stop it collapsing) but it also needs to vent foul gasses to atmosphere. That's the point of 1m above local opening window. If you remove the ability to vent as designed then it WILL still vent. However it will do so directly into your bathroom. Not only a potential health hazard, but worst of all a never ending moaning from the significant other...
The very minimum to vent should be 2" and make sure yiu have no 90 deg bends, 45 degs max.
Well unless I've read it wrong
You also do not quite understand the pipes function.

The pipe not only lets air in (to stop it collapsing) but it also needs to vent foul gasses to atmosphere. That's the point of 1m above local opening window. If you remove the ability to vent as designed then it WILL still vent. However it will do so directly into your bathroom. Not only a potential health hazard, but worst of all a never ending moaning from the significant other...
The very minimum to vent should be 2" and make sure yiu have no 90 deg bends, 45 degs max.
You also do not quite understand the pipes function.

The pipe not only lets air in (to stop it collapsing) but it also needs to vent foul gasses to atmosphere. That's the point of 1m above local opening window. If you remove the ability to vent as designed then it WILL still vent. However it will do so directly into your bathroom. Not only a potential health hazard, but worst of all a never ending moaning from the significant other...
The very minimum to vent should be 2" and make sure yiu have no 90 deg bends, 45 degs max.
You also do not quite understand the pipes function.

The pipe not only lets air in (to stop it collapsing) but it also needs to vent foul gasses to atmosphere. That's the point of 1m above local opening window. If you remove the ability to vent as designed then it WILL still vent. However it will do so directly into your bathroom. Not only a potential health hazard, but worst of all a never ending moaning from the significant other...
The very minimum to vent should be 2" and make sure yiu have no 90 deg bends, 45 degs max.
hi have I read it wrong then ? You can't use an Aav in this instance then . I did speak to Poly Pipe technical they seemed ok ????
 
There is no such thing cant, of course you can. You can do what you like. However, whether you should, whether its the correctbthing to do is where Im coming from.

By giving you chapter and verse you know potential consequences and choices. Therefore, you take complete responsibility for your actions.

Have fun.
 
Stants , of course you can use an AAV , just make sure you can get it if it fails , they do , but are generally very reliable , buy a McAlpine one not a chinese ebay one .
You mention building control , so they obviously know about it , so they should be happy with an AAV .
 
Well, it really depends on the circumstances, for example whether the drain is vented elsewhere, and whether it is prone to surcharging. A drain does need a vent open to atmosphere and there are guidelines as to how many OPEN vents (as opposed to stacks that are only partially vented by AAVs) there should be and where they should be.

FWIW, I'll give an example. My neighbour was told by the BCO that he would be allowed to use an AAV if my soil stack (connected to the same drain) was open to atmosphere, but not if my soil stack was terminated in an AAV.

What Yorkshire is suggesting is, however, best practice and how they used to do it in the old days, but there are also good technical reasons for not wanting to run a pipe through the loft that would make even a Luddite such as myself agree that AAVs are sometimes a good solution.
 
There is no such thing cant, of course you can. You can do what you like. However, whether you should, whether its the correctbthing to do is where Im coming from.

By giving you chapter and verse you know potential consequences and choices. Therefore, you take complete responsibility for your actions.

Have fun.
Hi Dave I see what your saying " if it aint broke don't fix it "
Cheers
 
Soil stack won’t vent into room. That’s the point of AAV. They do need to be installed above the spill over level of the highest appliance though. This usually means above the top of the upstairs basin.
For this reason the soil pipe would normally be taken up into the attic and have AAV installed there.
It would be accessible and saves having to go up through roof.
 
Soil stack won’t vent into room. That’s the point of AAV. They do need to be installed above the spill over level of the highest appliance though. This usually means above the top of the upstairs basin.
For this reason the soil pipe would normally be taken up into the attic and have AAV installed there.
It would be accessible and saves having to go up through roof.

Sorry disagree had a few fail over the years . Smells tracking back whipped off n changed job done
 
Dan I didn't make myself clear. Sorry.

It's not the failing at all. It's the fact that the vent pipe is just that - a vent pipe NOT just a soil pipe. Gasses build up and vent to atmosphere through these pipes. By only having an aav there is no where for the gasses to go that wish to vent so pressure builds and they eventually vent via the shallowest trap in the space - most often in my experience the bath or indeed someone else's bath or basin...

We have a whole estate on some 600 houses here where nothings vented cos they didn't "....want the roof line to be disturbed" It's cost people thousands to have em modified. Thing is not all have suffered even though they are all piped identically. Being prudent is all I'm advocating. None of us want call backs and Rubbish flying later.

It's just occurred to me why work tailed off there without doing them all. By fitting a fair amount of vents, its probably allowed gasses to vent off elsewhere on the system - possibly! Thing is, it's a literal lottery!

D
 
I can see why it would cause a problem not having any vent pipes. But it’s all accounted for in the regs etc etc.
I think as a rule of thumb 1 in 4 properties draining into the same system, should have a vent pipe. All the others can have stub stacks with AAV’s.
 
This is basic level 2 NVQ stuff. Not something I memorised exactly as I knew it would be rare that I'd need to know the detail (can easily look it up), but seem to remember head of every drain must be ventilated to an open vent, and the foot of every drain too if more than x properties served. Agree with Dan (above).

Why is Building Control approving developments where there is not a single open vent? Another example of the same corrupt and ineffective system leading to a lack of informed regulation which led to Grenfell.
 
The requirement to vent the head of each drain run is there not necessary for the benefit of that set, it is required to vent off the sewer gasses which would otherwise build up to dangerous levels in the road (main sewers). Street vents which directly vent the sewers have not been provided for many years now because of this.
In systems with an interceptor trap to disconnect the two systems a vent is required to equalise the pressures in the system as waste moves through the set, as well as to vent of the gas.
 
That's what I was thinking changing the Aav,s a simple process plus I'm going to the trouble of concealing the soil pipe ( purely aesthetics) my existing Soil pipe is an old cast iron which I've away hated looks crap

View attachment 33991
Get a lasso around that old stack, stand well back and pull hard..... umm maybe not in this situation... there would probably be a lot of tiles n more to replace.

I've pulled one down with a rope, a lot of years ago, it was a straight CI stack... the property was empty (no people in) it made a lovely sound when it hit the ground..... crack..crunch :)
 

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