can pipes sound like knocking noise?Can sometimes here knocking above my bedroom which is loft (roof space)?

Answer 1

Do you hear a croaky noise and see a wee japanese kid running about??

Answer 2

Plumbing can make many weird noises which can have many causes and; sometimes, they're not easy to isolate and fix.

A Single Bang, Knock, Clunk or Clang
Such sounds are usually caused by a phenomenon called 'water hammer.' Water hammer doesn't accompany flowing water, so if your sound occurs while water is running, it isn't water hammer.

Water hammer happens when you turn OFF a water flow suddenly (like a dishwasher, a clothes washer, a toilet or even closing a hand faucet suddenly. Shutting off the flow suddenly sends a pressure or shock wave down the water line through the water shocking the pipes and creating the 'hammer' noise. These shock waves travel faster than the speed of sound and can exert very great instantaneous pressures. Over time, water hammer can damage pipes, valves and eventually weaken pipe joints.

Most modern homes have devices called water hammer arresters ( they're called various things such as air chamber, air cushion, water capacitor, etc.) . They are air filled chambers connected to the plumbing that let the pressure wave dissipate harmlessly into a cushion of air. If your banging has been happening forever you may not have one.

Sometimes these arresters become waterlogged. Try this. Turn off the water to the house at the entry. Find the lowest faucet in your house--often this is an outdoor garden hose faucet--open this faucet and then open a few of the indoor faucets at high locations such as upstairs or at a wet bar and let the low faucet drain for 5 minutes or until it stops dripping, whichever takes longer. Close all the faucets and turn the main back on.

Answer 3

Pretty much everything written here is true. If it's a cracking noise when the heating comes on or goes off, it's the sound of the pipes expanding. Greasing them where they go through the floor joists may help a bit.
If it's a big thudding sound, normally after you've flushed the toilet then it's a water hammer. In this case go into the loft and look at the ballcock in the water storage tank. You can normally bend the arm slightly to solve the problem, but if the ball is damaged you may need to replace it.
If you have a noisy hot water pump (normally in the airing cupboard) you may get knocking or whoosing noises. If the pump is adjustable try turning it down a little.
Other noises can be caused by heating problems which need a plumber to look at.

Answer 4

I don't think it is normal to have air in your water pipes and air compresses so it will not cause a very good rattle sound... it can cause a splatter when it is expelled at the faucet.

Well plumbing pipes can make a rattling sort of knocking sound ... which is called "water hammer". It is caused by reason that water cannot compress and a shock wave is sent back through the hot or cold water pipe when the faucet is turned off quickly... dishwashers and washing machines are notorious for triggering water hammer. The shock wave will continue to travel through the water pipe, rattling it along the way until the wave dissipates through friction. Clipping the pipes properly helps reduce water hammer, but too many clips can increase the sound of water hammer.... it is an art more than a science, I think.

If this is your problem, it could be solved by a "pressure reduction device", or alternatively a "water hammer arrester" which a plumber installs in the disagreeable pipework.

However, unless I hear the noise, I cannot be certain that it is water hammer... it could be a branch of a tree being blown in the wind for example.

If you think it is the plumbing... you will need an expert plumber and they will charge you a fee to come and investigate. Try checking for yourself.. if you have a tap that is lever action flick fully it on, have someone go up in the bedroom to listen, then see if you can re-create the sound by flicking the tap off quickly. Try it with hot and cold water. Try it in at all the faucets. If that fails, turn on the dishwasher and listen throughout the rinse cycle until it stops that... if that fails.. try the washing machine on rinse cycle. If it is water hammer, this exhaustive process will disclose it.

Answer 5

Yes, they can - like some of the others commented - it is to do with air in the water pipes, which as it gets pushed around can lead to the banging sound.

What you can do to solve this is to bleed you radiators - this is not so difficult.

If you look at the back of your radiator, you will find a small circle with a square in the middle. Find the key for the radiator (you can get one from a DIY store if you don't have one - very cheap), put a towel under the radiator, and turn the key.

There should be a whistling sound and some rusty coloured water coming out. Once the whistling has stopped, the gas will have been completely released, and it should stop the knocking sound.

Don't forget to tighten the lock on the radiator again - good luck, and if you have any problems just IM me.

Brendan

Answer 6

Yes pipes can make a knocking noise - its usually caused by a combination of a faulty ball valve and pipes that don't have enough support.

Answer 7

Yes water pipes will make noises as they heat up & cool down due to temperature changes. Also air in the pipes will make noises. Wood in the attic will make noises as it cools off from the days heat as well.

Answer 8

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Answer 9

Pipes usually have a rumble sound to them not knocking this is your water heater having this knocking sound, I have the same problem with my water heater and I will be replacing it soon, you need to do the same with your water heater as well. Good Luck !

Answer 10

yes pipes can make a knocking noise still i would get it checked out maybe they need lagging to make them quieter

Answer 11

yes when heat is applied the pipe expands and can make noises like you are describing.