Loud tìcking waste

[jc86]

Hi all

After some advice....

We are getting fed up with our waste knocking each time we use hot water.

the knoking seems to only when we run the hot water from a cold start in the ensuite. Guess the pipe is just cold and the hot water makes it move enough to make noise.

I can feel the ticking and knocking if I put my hand on the pipe, so pretty sure it's not a copper feed knocking into it or anything.

Anyway any views on how best to dampen the noise off without taking the wall apart too much - planning to paint but not re tile or plaster! Wondered about some spray foam, or trying to pack some rockwool in there. Wall is block cavity with the battoned and boarded boxing in.

Thanks!

 

[Madrab]

Soil pipe expansion, as you suggest basically it clicks when the hot water warms the pipe. Sometimes it's against each other, sometimes it's against the clips or stuff they rest on/touch. It can also sometimes be at the glued boss connection where the waste pipe enters the stack

You aren't going to like this, the only real cure I've ever found for that is to either remake the waste connection, if it's not that then it's either split the soil stack sections and re-grease the seals or try to 'move' the sections as they sit around the clips and see if that helps. Only issue with that is breaking those seals can unsettle the joins. It can be a real PIA to find and fix

 

[HERTS P&D]

Take off the bath panel for better access and post pictures.

Andy

 

[Notch7]

“A loud ticking”

have you had any Russian visitors recently

 

[jc86]

That might be my next step...its tiles but looks like a screw rather than adhesive for access....

 

[HERTS P&D]

Remove the screws then cut along the edge with a stanley knife and then try and prise off.

Andy

 

[jc86]

As an aside, house is only 3 years old....surprised the SVP isn't wrapped in wool or fibreglass?

 

[johnny2007]

Mine have been doing that for years.
At one point I was getting mad about it, trying to find out where the noise was coming from.
Once I found the source, I just turned my brain switch off and don't pay attention to it anymore...until I read this thread...

 

[Madrab]

As an aside, house is only 3 years old....surprised the SVP isn't wrapped in wool or fibreglass?

Nah, that suggests that a lot (not all) of modern developers care about that kind of thing. Not sure if it's in the regs or not but I'm not a builder.

 

[jc86]

So......managed to get access under the bath. The spare inlet boss was touching an upright stud, so have trimmed that back which has helped stop the reverberating.

However, where the waste inlet from the other room joins the vertical stack inbetween the studs, the pipe is expanding and moving, almost like insufficent expansion room has been left in the joint. Still only makes the noise when the pipe changes temp. However I thought with these fittings it was not possible to over insert the joint.

Not sure on next steps now....access is a real pain, not sure how easy / worthwhile it would be to take the joints apart, trim / grease / reasssmble.

Or maybe the pipe must still be touching the floorboard or stud......

Time to call a plumber I think!

 

[Hugh Jaleak]

Pulling those apart is going to risk exposing yourself to a whole new world of pain, the seals tend to 'set' in position, chances are they may not seal again once disturbed. How desperate are you to sort this noise issue out?