Gurgling sink

[NTC1234]

Hi,

I hope someone will be able to help me with this. I recently had my bathroom redone, and there have been a few problems with it. One of the issues is gurgling when the sink drains. It sounds like a 6 pint bottle of milk is being emptied a few seconds after the tap is shut off. It’s quite annoying and not something I have experienced before. From what I read it could be to do with venting? I told the plumber, and his response was the gurgling sound is due to the waste being adapted to a high flow waste to take the shower water, it’s the water spinning as it goes down the pipe. Nothing to worry about there.
Does this sound right to you? I’ve never heard gurgling like this before. Is this a problem with high flow waste pipes generally?

TIA

 

[Aquarius]

Sounds like the wastes might be teed in close together, and no anti-vacuum trap fitted.

 

[SimonG]

Sink tied into shower waste and pipework probably undersized. Try an anti vac trap on the basin.

 

[snowhead]

It might also be tile grout that been washed down and has set in the trap or pipe,, assuming the bathroom has new tiles.

 

[NTC1234]

Thank you so much for your replies. I will have a chat with the plumber about it. I’m a bit worried that he has tried to fob me off though.

 

[Aquarius]

Thank you so much for your replies. I will have a chat with the plumber about it. I’m a bit worried that he has tried to fob me off though.

Just be persistent and polite.

 

[NTC1234]

I just wanted to come back on here to say thanks. My sink is nice and quiet now when it drains! The anti vac trap sorted it out.
Unfortunately, I’ve noticed a tapping sound through the ceiling downstairs when the sink drains. It sounds like the noise is coming from further along the pipe as the water runs from the sink into the soil pipe. Any idea why it is making a noise?

 

[Basher]

I just wanted to come back on here to say thanks. My sink is nice and quiet now when it drains! The anti vac trap sorted it out.
Unfortunately, I’ve noticed a tapping sound through the ceiling downstairs when the sink drains. It sounds like the noise is coming from further along the pipe as the water runs from the sink into the soil pipe. Any idea why it is making a noise?

If it's like a clicking noise, and happens when you drain hot or warm water from the basin, it's likety to be thermal expansion along the length of the waste pipe causing the noise as it slides in clips holding it, or maybe moves in its joint with the down pipe, or it's rubbing against something. If it doesn't happen at all with cold water then that's probably it.

If it happens whatever the water temperature, maybe it is a drip/ leak? That will no doubt become obvious on the ceiling!