Noisy after toilet flush.

[Piecringe]

Hi,

We have two loos - one upstairs and one downstairs. Starting about a month ago when you flush the loo or a few seconds afterwards there is a very loud vibration which you can feel when holding the cold tap. It sounds like the Queen Mary leaving port! It doesn't always happen though. Any ideas anybody please?

 

[ChrisR]

The washer - just change it for a new one.

 

[Piecringe]

Which washer do I change?

 

[Slugbabydotcom]

The one in the ballvalve in the cistern. Also look for loose/ unsupported pipework. Many bottom inlet valves have a 'support screw' which should stop the head of the valve from starting the vibration. Thread this along so that it touches the side of the cistern then tighten the locknut/s

 

[Piecringe]

But not suddenly both loos at once. The whole house vibrates!

 

[gingerbreadman]

you have got waterhammer it sounds like,best thing to do is change ballvalve in cistern