Tapping noise under bath - a leak???

[Jennie]

Not a bath fitted by myself (I'd never tile it in for a start)...

Customer: "We think we may have a leak under the bath. When the bath is emptying from full to half full we can hear a tapping sound- but that’s the only time. If the bath is only full to a shallow amount, or using the shower there’s no tapping. No water marks of smell. Unfortunately our bath is completely tiled in, so getting under the bath I guess is a last resort. Could it be air pressure or blockage causing the sound? It’s not draining slowly."

I suspect a leak. The bathroom has only been in for two years, so likely I'll suggest they get the original installer back in. ((I'm off the tools at the moment with an arm injury)).

Any thoughts much appreciated (before I tell them to take tiles off).

Jennie

 

[Roy_66]

Wondering if the (prob Flexi) overflow pipe from the visible overflow plate on the bath down to the waste under the bath, has fallen off perhaps at the plate that prob has a plastic elbow behind it. Here is example of the bits I'm talking about:

https://www.NoLinkingToThis/p/mcalp...93tUa_I3_8xevLXhAY8BrzGeS6KV-JioaAtpuEALw_wcB

Think the bath pan should be removable for maintenance. If that is rejected, you could perhaps suggest a borescope camera, but it won't do any actual work. Can get one for about £30 with WiFi to your phone.

Cheers,

Roy (amateur plumber)

 

[Ben-gee]

Hi Jennie, does it do it more with hot water? I suspect it is just waste pipework rubbing on something- maybe worse with hot as pipes expand.
if there’s no sign of a leak below I doubt it’s a leak.
To prove to a customer in a similar situation I drilled a hole in back of airing cupboard and we left a twist of blue paper which came out dry - this wasn’t made good so they could repeat many times - there was no leak.

Can you access from other side of bath - ie air cupboard , wardrobe etc?