Air Admittance Valves

[melmos]

Hi Hope that someone can advise on this problem. Went to a new build house, 7 months, owners having problem with downstairs toilet and main bathroom toilet which gurgles shower trap when flushed. There are 2 ensuite toilets which go to an external soil pipe open to the air, these are ok. The downstairs toilet and main bathroom are in the middle of the house and have seperate soil pipes going straight down through the building, each has an air admittance valve on top and are boxed in. When flushed the toilet bowls fill right up before draining, I gained access to the valves and removed the top covers opening the soil pipe to the air and both toilets flushed normally, the shower didn't gurgle. I dont know a great deal about these valves anyone have any ideas on how to overcome the problem. Many thanks in anticipation.

 

[peteheat]

Why dont they ever make plumbing problems easy <tut tut>

So we can make the big dosh

 

[BrookesyUK]

It's got to be AAV after the description of what happened as soon as the lid was off. Proves it straight away.

 

[melmos]

Finally got back to house, first task was to rod drains to check for a blockage, removed man hole covers and discovered this, as toilets were flushing without AAV never gave a thought to lifting them prior to this, these are downstairs toilets. Main bathroom was blocked too, but not to this extent. The white pile on the right of picture 2 is baby wipes. So cleared all drains eventually and toilets flushed perfectly. Looks like Koogatubac was right. Put some grilles on boxing in as per system3 recommendation and went home for a shower. Thanks to all for input.

 

[peteheat]

Good result, well done.

 

[TBServices]

Baby wipes. 90% of the time, every time.

 

[Plum Bob 66]

System, i thought the same problem was the AAV's, took them off and the toilets worked normal, slowly screwed them back on and the water level rised.
This was on the 2nd house from 4 houses.
Setup was full stacks in bathroom and stub stacks with AAV however 1 in every 4 houses had to have 1 natural ventilation (head of the drain)

I originally thought the AAV's were faulty

What happened was at the head of the drain (where the blockage was) brought all human waste up in their 1st level toilet. Drainage guys came out, half a day unblocking in a road, ended up being in the drains, they put a equal tee piece.
It was wrong and needed to be a swept tee. Thats where it was blocking up.

After that the toilets worked normal. So the AAV's werent faulty

Well done mate, right on the money this time, baby wipes would you believe yes I would/should as that was exactly what happened at my house.Either way fitting the grille to the AAV was a good call as well.

 

[BrookesyUK]

Great result there! Apart from the wipes haha

 

[Koogatubac]

Glad to hear you've sorted it
As i say i thought it was AAV for 2 hours until lifted main manhole. Wish i bet on it now haha!

System, u doubted me