Pipes rattling after washing machine has been on

[str]

Our pipes in the house have started to rattle at the eNd of the washing machine cycle (also happens when the dish washer has been on but not always).

Both machines are cold fill so must be the cold water pipe but I doesn't sound as though the rattle is coming from the kitchen! We haven't had any recent work done so no changes.

Anyone any ideas of the cause?

 

[joe-90]

It's called water hammer. The washer has a solenoid that shuts almost instantly. The weight of the water still has energy which is taken up by the pipes and often causes them to knock. If you can find out where just pad them out a bit.

 

[petertheplumber12]

Usually caused by unsupported pipe work, may be originating from the cold feed to the ball valve in the loft, the 15mm pipe may be vibrating. this makes the ball on the ball valve move, then the water gets waves and increases the movement and the vibration. If you don't have a tank in the loft then it pipes moving and hitting something metallic behind cupboards under floors, any where. Behind cupboards is a good one and fairly common. Often it is when the solenoid on the machine stops filling it is a violent shut off of the water. That is what starts it. see if you can do it by rapidly shuttoing off the cold water tap.

 

[ukrobj]

It's called water hammer. If you can find out where just pad them out a bit.

lol brilliant! Yeharrrr Cowboy Alert!

Or clip them properly.

 

[plumbplumb]

If you can find out where just pad them out a bit.

where?

 

[joe-90]

Dunno. I haven't heard them.

 

[plumbplumb]

Dunno. I haven't heard them.

You are clearly not reading what you are writing

 

[joe-90]

Oh I missed a comma.

cheers.

 

[plumbplumb]

If you can find out where just pad them out a bit.

Where???

 

[joe-90]

Wherever they are knocking.

 

[plumbplumb]

If the OP can't find where the knocking is and clip it like most normal people would do, where do you suggest he use the miracle padding?

 

[RF Lighting]

How would you suggest the OP cures this problem if he can't find the source of the knocking?

 

[plumbplumb]

How would you suggest the OP cures this problem if he can't find the source of the knocking?

who are you asking?

 

[joe-90]

If the OP can't find where the knocking is and clip it like most normal people would do, where do you suggest he use the miracle padding?

The most likely place for the knocking is under the floorboards. When was the last time you clipped under the floorboards in preference for wrapping them in felt??

 

[hazetimesfive]

felt - stone age