Soil stack/pipe noise

Dan-Dan

Hello

in our upstairs bathroom , the soil stack , or pipe , if thats what you call it , is tiled in behind some wall , when we empty the bath , it sort of taps , if that makes sense , like a continous tapping noise , should i be worried? or is it just `one of those things` ?

Cheers

plumb1_2

its just the plastic expanding, when the warm water enters it.

Dan-Dan

Thanks mate , thats reassuring to know , gent

mttylad

either that or you have some gremlins in there drowning and banging on the wall to get your attention.
Let them drown

Dan-Dan

Just to bump this ......this ticking/tapping noise , seems to occur when any water gets released from the bath or sink , even if cold.....

any thoughts?

googler

Could it be the air admittance valve at the top of the stack flapping about....?

Is it a regular rhythmic tapping, or random?

Dan-Dan

hi googler

it`s regular rythmic and only ever when water has been released from the bath and/or tap , the noise never occurs otherwise (inc when flushing loo)

which confuses me now i say it, because doesnt bathw water drain into regular drainage , i.e seperate from human waste

Presumably (i will look again later) our water wastage from the bath and sink is routed to the soil stack as i do not have pipework outsode the bathroom on the back outside wall

muckybutt

Two types of drain :
Rain water and Grey water.

Rain water is as it says on the tin, just that nothing else... these normally go into a soak away somewhere in the garden.

Grey water is water from Kitchens - utility rooms - bathrooms including toilet waste, these will go to the foul sewer in the road.

The tapping noise could be a few things, more likely than not just the pipework as said above contracting and expanding, it could also be a failed air admittance valve - nothing much to worry about, if you notice sewer smells from the area where the noise comes from then that really points to a failed AAV as it will be allowing the foul smells past the diaphragm.

Dan-Dan

I assume you access the AAV by the very top of the soil stack (which is protuding from the roof) ?

muckybutt

Yes ... if that's the one making the noise, some plumbers do install smaller AAV's on bath / sink waste pipes as well to stop the "gurgling".