Am I getting my traps mixed up

[Riley]

Customer has just had a new bathroom fitted. Basin waste runs directly into an unvented soil stack. As a consequence as the basin drains it makes an awful gurgling sound. I have done away with the bottle trap that bathroom installer used and fitted an anti vac pedestal trap. When I left all seemed fine but I have just got home to customer call saying that gurgle is back. I'm now doubting myself, should I have fitted an anti syphon trap.

Cheers

 

[stevetheplumber]

they are the same trap usually incorperating a small air admitance valve, might have to fit a full sized aav some times slowing the flow works if its a pop up waste try lowering the plug so it empties slower

 

[Riley]

Cheers Steve appreciated. Glad I'm not cracking up.
There is literally nowhere to fit an AAV unfortunatelyeverything is wel well hidden in walls.bitt of a botch to be honest. Basin waste is a clik/clak waste so can't be screwed down any further. Thanks for your input mate

 

[stevetheplumber]

probably up sizing the pipe work is the only solution the stack being unvented isnt realy relevant unless another item is sucking the trap its purely cause by the plug of water in the pipe pipe is either running down to sharp or under sized for the run out many years ago we used to solder a 2p under the grate on sink wastes to slow them down

 

[Riley]

probably up sizing the pipe work is the only solution the stack being unvented isnt realy relevant unless another item is sucking the trap its purely cause by the plug of water in the pipe pipe is either running down to sharp or under sized for the run out many years ago we used to solder a 2p under the grate on sink wastes to slow them down

Thats actually a blooming good idea.

I was contemplating using a waste pipe AAV rather than a stack one. My merchant has an AAV adaptable to fit 1.25 inch and 1.5 inch was wondering if that might help.

 

[newcastle phill]

Just curious...why is the main stack unvented, nothing there at all ?
Would have thought flushing the karzi may have risked pulled traps ?

 

[Riley]

It was pulling traps and making a horrendous noise in doing so anti vac trap has solved that but not the noise