Banging/Knocking under kitchen sink(even not used all day)

[glasgowm8]

hi guys

looking for some advice. have had constant banging and knocking from im 100% sure is the incoming mains water pipes into my kitchen for the last few months. This even happens when the tap has been off for a few hours and no dishwasher and no washing machine in use and even during the night (taps not in use)

it also seems to affect the cold water pipe that leads to the only other downstairs sink, the downstairs bathroom. House is 16 years old.

Is there any solutions to this problem? I always thought water hammer or air in the pipes is made worse when you turn on and off the cold water taps but for me it seems to happen all the time, even during middle of the night!

help please thanks

 

[Armo74]

Could be a toilet flush valve letting by.
Do you have a combi?

 

[glasgowm8]

ive got a normal condensing boiler with hot tank and cold tank in loft etc

i tried taking water off from stopcock under sink and letting the two cold taps run dry but its not reeli helped.

 

[Fluffster]

You may have a shared cold water supply and water hammer is occurring when the neighbours use the supply.

Pete

 

[glasgowm8]

even though im in a detached house?

 

[Fluffster]

My crystal ball cannot see as far as Scotland

Pete

 

[glasgowm8]

you reckon just keep trying to take off water and drain down the cold taps a few times to get air in and if doesnt go away then call the plumber?

aslong as it isnt anythin dangerous that isnt going to ruin my pipes or anythin!

 

[footprints]

Are you sure it's not Harry Potter locked under the stairs?

Hard to diagnose these things but one cure might be a Shock arrestor fitted on the mains supply.

http://www.plumbcenter.co.uk/en/hea...tecnic-pneumatic-shock-arrestor-1-2-bsp-17952