Fix-It Friday: How To Quiet Pipes That Shake, Rattle Or Roar

banging pipes
Fix-It FridayHome Improvement 78 Comments

“I’ve got a question about rattling pipes. About 2 months ago, I noticed that when I turned on the faucet, a pipe somewhere in the walls of the house shook and made a pretty loud roaring sound that was strong enough to be felt in vibrations. It only lasted a few seconds. Over the next few weeks it got worse and would go on for 3-5 seconds. Then it seemed to ease up (no more vibrations, shorter duration) and not occur every time I turn the faucet on, but it never did go away. Should I be worried about this? Is there any way to fix it? Thanks!” – Gargouille, WYSK Reader

NV: Hi Gargouille! Rattling and roaring pipes, ay? Does the rattle sound more like a low slow banging or rapid machine gun fire? Any whining or squeaking? Hissing or tapping? I’m laughing to myself because this reminds me of those AAMCO commercials where the customer is standing in the repair shop imitating bizarre car noises to the mechanic.

maybeFunny stuff, but the truth is, sounds are very telling – and not just the sound, but also where and when it makes the sound that can help diagnose a problem.

In your case, the rattle happens when you turn your faucet ON and it’s coming from “somewhere in the walls.” Based on these two factors, I’ll deduce that when the faucet is turned on, the movement of the water running through the lines is rattling a pipe somewhere – a pipe that has loosened from a strap that once held it firmly in place. A loose pipe is the noise culprit! But then again… it could be air in the water system. Or is it something else entirely, like water hammer?!

Gargouille, what we have here are the same dreaded diagnostic dilemmas faced by mechanics, tradespeople, and doctors alike! You ask, “Should I be worried?” Maybe. Again without a definitive diagnosis, it’s hard to answer, but I will say, if any vibration is strong enough it can’t be good for your pipes and fittings.

Ok, deep breath. Try the simplest solutions first.

If I were you, this is what I’d do:

  • secured pipeHave someone turn the water on and off while you try to identify exactly where the sound is coming from. Test both the hot and cold water from the faucet.
  • When you locate the banging pipe, hopefully it will be exposed (like in the basement or crawlspace). Secure the pipe by adding a small piece of foam or rubber pipe insulation to the pipe and re-strap it.
  • If the banging pipe is behind a wall and can’t be accessed, there’s not much you can do without opening up the wall. You can try to wedge padding or wrap insulation at each point the pipe emerges from behind the wall or at shut-off valves.

If this last procedure doesn’t help, try purging the water system, which will void any trapped air in the pipes, as well as replenish intentional air in air chambers. I know that sounds counterintuitive, but air chambers (vertical pipes installed close to the shut off valves) are designed to prevent “water hammer” by absorbing pressure up in the chamber, and if these chambers get filled with water, they stop working. (I’ll get to what “water hammer” is shortly.)

To empty your water lines:

  • Shut off your water at the water main.
  • Starting from the highest faucet from the main (or farthest in a single story house), turn on all of your faucets, flush your toilets and briefly turn on your washing machine and dishwasher, until all the water is voided from your system.
  • When the water stops draining, starting with the lowest faucet from the main (or closest) shut them off, re-flushing the toilets too.
  • Now slowly turn the main back on. Water will be back in your lines, and air back in the air chambers!
  • You may have to repeat this procedure to get it right, and don’t be surprised if air sputters out when you turn the faucets back on.

Mind you, countless sounds can indicate a myriad of plumbing issues. Reviewing them all here would be a major yawn fest. That said, I will discuss two of the biggies – water hammer and HIGH water pressure.

Water-HammerWater hammer – This is a specific problem with a distinctive loud repetitive banging sound that occurs when a faucet or valve is shut OFF. If it’s bad enough and left uncorrected, water hammer can loosen and even break fittings and valves! It’s caused by an abrupt stop of water flow at the stopping point (a faucet or shut-off valve). The pressure bounces backwards through the water and creates that hammering sound. Emptying the system of water (detailed above) can cure water hammer. If it doesn’t, it’s time to call in a pro.

Water Pressure GaugeWater pressure – The maximum recommended residential water pressure is 80psi. (We have our municipal water systems to thank for how much pressure our water has when it reaches our home.) Water pressure that’s over 80psi can really cause plumbing problems – like literally cause fittings to burst! You can test your water pressure with a water pressure gauge (around $10 at the hardware store). To test your water pressure, screw it on to a hose bib (spigot), turn the water on and read the gauge. If it fluctuates over 80psi, call in a pro who will simply install a pressure regulator at your water main. (If only getting my blood pressure under control were that easy!)

So now Gargouille, if your pipes go bump in the night, or in the middle of the day, you’re all cool on how to calm the clatter. Thanks for your questions!

Norma sig

Got A DIY Question? Ask-The-Expert!

If you have a DIY home repair, maintenance or improvement question for Norma, now is your chance to ask-the-expert and have her answer. Your burning question may just be the “star” of an upcoming Fix-It Friday column.

Add your question to the comments section below or email it to Women You Should Know.

Fix-It Friday is an exclusive Women You Should Know® editorial series authored by seasoned veteran of home improvement, Norma Vally, the former host of Discovery Home Channel’s series “Toolbelt Diva” and a show on Sirius Satellite Radio by the same name. The weekly column is designed to inspire women – weekend warriors, aspiring handywomen, and even seasoned DIYers – to take on home repairs and maintenance projects with confidence and gusto.


  • gargouille

    Wow, Toolbelt Diva, thanks for this amazingly thorough response! I think I have everything from rattles to hammers and I’ve been told we have bionic water pressure…so, there’s some serious sleuthing on my adenda this week-end. These concrete tips are invaluable. I feel ready!

    • Norma

      Excellent, Gargouille! Glad to help and don’t hesitate on any follow up questions you may have. Have fun fixing!

  • AJ

    Hi Norma, It’s been a few weeks since you answered my question about how to remove the gook from shower heads. We were away so I did not have the opportunity to try your tip sooner. But yesterday I soaked both of them in straight white vinegar, and VOILA, it worked! Not only are they cleaner, but the water pressure is better. So thank you very much for the tip. I’ll make sure I do this every few months to keep them clean. Thanks again.

    • Norma

      You’re very welcome! So glad it worked and then some–better water pressure is always, better!

  • bvreml

    Norma, I have the repetitive banging when the water is on. It only started after I tried curing water hammer by draining the system as you describe. Now it seems like it’s worse. The noise seems to start when a toilet has been flushed and someone turns on the shower or sink–a pretty common occurrence. I’ve tried a couple of times to drain the system again. Maybe I’m not doing it right. I also have a slight leak in one sink faucet. Would that defeat the purpose of draining the water? Thanks for your help.

    • Norma

      Ok, let’s see…are you sure when you’re draining the system you’re opening the lowest drain? It could be a hose bib outside, or a sink in the basement. The leak in the faucet shouldn’t be the culprit.
      Have you tested the water pressure in the house with a gauge (see above about water pressure gauges)?
      Also, the banging when the toilet flushes sounds like water hammer, BUT the banging when the sink or shower turns ON sounds like something else (water hammer happens when a valve shuts OFF). So, my question is, does the banging happen only when you turn on the hot water? If that’s the case, lowering the temperature a bit on your hot water tank could correct the banging.
      Let me know what you come up with!

      • bvreml

        I believe the issue was an air pocket in the line to the hose bib. We had opened all the faucets inside, but didn’t open the hose bib outside after we drained the system. Then when we tested the water pressure on the hose bib, the banging went away. The hose bib water line came off the main line after the meter at a T. If there was air in that line, I’m suspecting it acted basically like a pipe organ and started the vibration. When that line was cleared, the noise went away. Thanks for your help.

        • Norma

          Excellent! I had a feeling it was a sneaky hose bib. Congrats on the fix!

  • leslie

    we have a banging tap cold water in the kitchen it started dripping then after a couple of days it is banging and very it a washer we are needing ir should we call the plumber

    • Norma

      Hey Leslie!
      I need to know, when does the banging happen, when you turn the water on or off?
      As for the dripping, it may be related to the problem, but it depends…No matter what, if you have dripping you should fix it, which will mean replacing a worn washer (or cartridge or O-ring, etc.) depending on what type of faucet you have in order to stop the dripping.

      • leslie

        hi norma it starts when i turn the cold water tap on and it makes a horrendous noise and i have to keep th water running until it stops or tap the side of the tap

        • Norma

          Ok, if the noise occurs when the water is turned on, it’s likely to be air in your system. Being that that faucet is dripping, as I had mentioned, go ahead and get that fixed first. That could possibly correct the noise. If it doesn’t, I can walk you through bleeding all your pipes systematically to get the air out.
          I’m curious, is your kitchen on the top floor of the house? Also, about how old is your home?

  • Tee pee

    I have noticed after having a new hot water heater installed the hammering condition started—are the two related ?

    • lordofthering

      Lower water temperature of your hot water heater below 135 F or install Thermal Expansion tank on incoming pipe to cold water side. See below link I installed this tank to get rid of the same issue. It took me months to figure it out.

    • Norma

      Hey Tee pee! Good advice from lordofthering! Before installing an expansion tank, though, I’d first see if purging the system corrected the hammer. The steps are listed in the above article. Let us know how it goes!

    • Chris

      In my experience, I tried everything on this site. and non of it worked. I continued my research, and found the problem. The problem was the cartridge assembly inside of the faucet. Since my bath tub faucet was old, some of the things in the cartridge must have worn out and broke down internally, which caused a loud banging noise after turning off the water. If you have tried everything on this list, and nothing worked, I would search “cartridge assembly,” and find which part fits your faucet. For me, it was the Delta Rp19804. Cheers everyone.

  • Michelle

    Hi Norma. I have tried draining the system after I had a bad water hammer from the washing machine. However, now it is much worse. I get hammer when using any tap around the house and when I shut off the water in the shower or tap on second floor, I hear a huge bang and hammering on the second floor. And in addition, pipes in the upper bathroom rattle when the tap is on I guess because of air in pipes as described before. What can I do? I did drain the system completely using the lowest tap in the basement and opened all taps afterwards, however I did not opened taps outside the house. I also checked water pressure and it is 45. Any help will be appreciated

    • Norma

      Michelle, drain the system again but open the hose bibs as well! That did the trick for WYSK reader, bvreml!

  • 1ofmanyfriends1

    OK so here is my issue that I have NOT read on ANY other forum. Of course, I always have an issue no one else seems to have!
    So the HARSH banging noise I am having occurs at all times of the day and night when water is NOT being used at all. It sounds like a hard knock on the door…maybe 5 or 6 hard hits against something in the house.
    I have done the water draining thing about 4 or 5 times each time taking the time to do it to the letter and correctly. If anything, the sounds seem to have increased since the last time I did this draining.
    Looking at each water outlet pipe, I see the original builder placed a length of pipe on each water outlet as a cushion for water pressure. A single man built our home in 1963 from the ground up. We had two great inspectors go through the home and they both said they have never seen a house built exactly the way a house should be built. As hard as they tried both said they could not find one thing that was not correct and could not believe how meticulous his construction was, including all plumbing and electrical. So I do not think there is anything that was overlooked during the construction of the home.
    We have lived here for 7years now and this banging has been occurring for about two months or so.
    I do have a tankless water heater and two sump pumps installed, one is an electric pump and the other is the back up pump that runs on water pressure located in the basement. Is there anything I need to be checking on either of these items? The issue did not start shortly after either of these items were installed so I don’t think they could be the culprit.
    Again, this sound is loud enough to be heard throughout the house and occurs at all times of the day usually occurring on 15 – 20 minute intervals. No water is being used during these times. Also, we have baseboard heating and since it is summer, I have turned off the boiler. Both the electricity is off and the pilot light is turned off on the boiler.
    What is going on? I have read every article online and on YouTube and nothing. I had a plumber out and he was of no help at all as the knocking did not occur when he was here. He sat downstairs waiting for it and proceeded to inspect all exposed pipes saying all were properly tied down and seemed to be tightly secured, so that is also ruled out. He had no other suggestions and seemed to be bothered to be here. He stated it is an old house so it could be a matter of issues none of which he could explain. Since he did nothing, he did not charge us anything.

    • Dean Morris

      Any luck on your water noise problem I have something similar. Pies idle foe a while and then start thumping. Maybe more often in the afternoon. Running the water for a few seconds stops it.

    • Sally

      Have you been able to resolve your vibration issue? I have a very similar problem that just started a few days ago. Granted I did change out both toilets that the noise is near earlier this year….but I’m not sure if its related to the fixture or if something is just getting old.

      • 1ofmanyfriends1

        It ended up being an addition buffer between pipes on our sump pump. This was installed as the sump pump turning on and off made a huge slamming sound. That sound was muffled but then this next sound begin. The original installers of the sump pump discovered what it was and now no pounding on the walls, floor, etc.

  • summer h

    Similar problem here, when the toilet is flushed and filling up if you use (only when turning OFF not just using) any of the sinks/shower/tube in that bathroom, the pipes at the toilet vibrate and bang a lot. If the toilet is not flushing at the same time nothing happens. If just the toilet is is flushing nothing happens, only when toilet and other water source is being used and turned OFF. I can see the pipe at the toilet moving vibrating.

    • Norma

      Summer h, has this problem always existed that you know of? Or did it start after some plumbing work was done somewhere in the house?

      • summer h

        Just started this week. The valve on that toilet was replaced about 2 months ago. Turning the valve to let less water through (almost all the way shut now) seems to have reduced the issue, but it is still there.

        • Norma

          I had a feeling some plumbing work was done. Honestly, it’s on the plumber that installed the valve. What valve was it? Shut-off, fill valve? Honestly, if a plumber did the work, it should be on him/her to not have left you with this issue. But tell me, which valve was replaced…

          • summer h

            I don’t know what it is called, but the pipe comes out of the wall and into the valve with the screw to control the water to the toilet. I closed the old valve and it cracked so I ran to home depot and got a new one. Everything in this house is 28-30 years old. I replaced the valve and everything seemed fine for the passed 2 months or so. When I replaced this valve I turned the water off but never purged the rest of the house, think this might help?

          • Norma

            Yes, I think it will help. That’s the water shut off valve that you replaced. Purge the entire house, including hose bibs. Follow the steps I list above.

  • Lisa

    This saved me at 2 am. I woke up to what sounded like a war in the walls. My fiancé stood there just looking clueless lol! Thanks Norma!

  • Cat

    I have been hearing a sound recently whenever water flow stops. I doesn’t matter where it is stopping from; i.e. after a flushed toilet stops filling, or the washer, or after I’m finished washing dishes or showering, up or downstairs. It only happens after water flow has stopped. It sounds like a soft whale call or fog horn for about two seconds. It new and I have no idea why it’s making this noise. My front hose always has make this noise when being turned on or off, but now it’s in my house. Any idea what this is?

    Some more info: We have very hard water and no softener. Our house is only 13 years old.

    • Norma

      Hi Cat, when noise is heard when water STOPS it’s a sign of water hammer. Follow the steps I detail above and see if that helps. Don’t forget the hose bibs and faucets in the basement if you have one…good luck!

  • groo

    We get water hammer when using all of our hot water taps. However, I’ve found that if I switch off the hot water tap to the washing machine, the hammer stops completely. When the the washing machine hot water tap is turned back on, teh hammer returns. It makes no difference if the washing machine is on or off. I’ve tried draining the water system several times, but this one hot tap is a persistent problem. Any ideas?

    • Norma

      Hi groo! See what happens if you semi-close the hot valve to your washer. This could do the trick. If it does, great, BUT you have to make sure your washer is filling properly. Some washers fill to level with a kind of float, others with a timer. If its with a timer, then your loads won’t quite fill to the point it should. Let me know what happens!

      • Grooo

        Hi Norma. Thanks for the advice. I tried turning the hot valve on a small amount. The hammer noise is reduced, but still there. It only stops when that one hot value is completely closed. I’ve also tried an anti-hammer valve on the hose leading to the washong machine, but that didnt reduce the noise at all.

        • Norma

          Groo, you’re going after this issue with smarts and vigor! Love it! Have you checked the water pressure to the house? If it’s high, that could be the problem. Also, the anti-hammer valve that you installed, see what happens if you attach it on the washer side, instead of the valve side.

          • Groo

            Hi Norma, the pressure seems to be ok. With that one valve turned off, there is no problem and the cold pipes with higher pressure dont have hammer. I’ve tried the anti-hammer device on the washer side and it makes a slight difference, but still hammering in the pipes.

          • Norma

            Groo, to avoid the issue, being that it’s such a bear and mystery, let me suggest installing one of these dual shut-off valves for your washer, this way at least it will be convenient to shut the water when the washer isn’t in use.

          • groo

            Nothings seems to work. The work around is to leave the washing machine vlaves shut off unless the machine is in use.

  • Chuck

    I read your response about pipes that shake, rattle or roar. Thank you. I intend to follow the steps you listed to “empty water lines”. My question is: Do you ever have to uncap the pipe to put back air in the air chamber(s)? Another site wrote about uncapping a vertical pipe 2-3 feet long to let air back in after emptying the water lines. Thank you. Lake George, WYSK Reader

    • Norma

      Hi Chuck! About uncapping what sounds like a vent…it’s not necessary. The act of voiding all the pipes of water will automatically allow the air chambers (that got waterlogged) to refill with air. Good luck and happy un-hammering!

  • Bo

    I am hearing hammering noise with the pipes when I turn on the hot water in my bathtub and only in the tub. Kitchen and bathroom sinks are fine. I tried bleeding the lines by turning them all on and letting the water run for about ten min. It worked for a while but when I tried it again it started banging quite loudly. What can I do. I live in a co-op so it is my problem to fix…Please help me.

    • Norma

      Bo, being that it’s only coming from your tub, it’s likely that there’s an issue within that tub faucet–there could be something clogging a cartridge or a bad washer. I would investigate the tub faucet. Also, see if there’s a shut off valve dedicated to the tub, or that bathroom in general. If there is and it’s not in the fully opened position, that could cause hammering sound. Good luck!

  • BK

    I hope you are still available to offer help. In the last two weeks, I have been hearing very loud banging sounds. They are typically repetitive and seem to be coming form the floor on the first level of my condo or from the ceiling in my basement. It does not occur when I turn on or off the water either. This is a new home, built nearly two years ago. It does not occur when the heating system goes off or on. It its independent of that. Sometime the tapping/banging occurs for only a second or two. Other times, it can last for up to 30 seconds. It can be loud or soft. It occurs more often at night. I have my heating company come and they found nothing. Any suggestions as to what this may be?



    • Zen

      I think Norma is on vacation hopefully shes basking in the sun in 86 degrees. I wanted to ask a question maybe when she returns

      • Hi Zen – Norma is not on vacation…. she’s the hardest working woman we know! She’ll be getting back to Barbara shortly, and can answer any question you might have, as well, so just post it here. – The WYSK Team

        • Zen

          WYSK all the more for her to have a needed vacation 🙂

        • Zen

          I posted it above banging pipes just before the heat kicks on. I have oil heating and I had my system bled 2 times since October. Everything concerning plumbing its done to the tune of $625.00 what’s next?

    • Zen

      When does it occur Barbara? Mine is just before the heat kicks on. What a friggin annoyance to be awakened in the middle of the night. Seems like the house is haunted because it doesn’t do it during the day however someone told me that because it’s not quiet like it is when I’m sleeping I can’t hear it. My husband is going deaf (from my yelling LOL) so he doesn’t hear it . I night he snores loudly but not louder than the banging!

    • Norma

      Hi BK! Based on what you’ve described, sounds like pipes that are shifting around when temperatures fluctuate. Let me ask, do you live in part of the country that’s been very cold lately? This could explain why it only started the bast few weeks…

  • Zen

    Norma nothing was ever done with the hose bibs not one of the professionals touched the outside faucets. My question is should can anything be done now in sub zero temperatures? When and what can I do and what temperature should I do at?

    • Norma

      Hey Zen! Do not run any hose bibs until warmer weather comes. It’s good they are turned off in the basement and should stay that way for now.Wait until you’re well into temps above freezing for a few weeks. Weather is unpredictable, but I gauge it to when I see blossoms start to bloom–and my allergies kick in, LOL.

      • Zen

        Norma I shall… Happy Valentines Day you sound like a sweetheart!

  • Nopockets

    Thanks very much for the information about nosey pipes as I thought it would be a costly affair. Now I know I can understand and do something about it.

  • alissar.s

    i have a rattling sound in the pipe in my daughters bathroom. it comes on even if the water is not on. i have tried putting a hammer and we did the steps to open all the faucets and turn the main water off. i had a plumber who did all that and they still don’t know what the problem is. can you please suggest something else could be done. i need help.

  • Monique McAlister

    I have a problem with my pipes rattling bad whenever the hot water heater kicks on and this will last for 10-20 minutes. Then when I turn on another faucet while the hot water heater is still on, the pipes bang like crazy. I’ve checked the pipes and they are not loose. I’ve had 2 different plumbers tell me that I either need a new water heater (although it works just fine) or an expansion tank installed. Neither plumber has ever suggested draining the lines though. Recently the banging of pipes has turned into a rumbling noise. What do you suggest I do? I’m reluctant to call yet another plumber.

    • Norma

      Hi Monique,

      Sorry you’re having this pipe banging issue. It’s disturbing and disconcerting, indeed!

      Simplest approach first…try draining the lines. The steps are in this Fix-it Friday post.

      Taking it to the next level…How old is the hot water tank? Even though it seems to be working fine, it could be reaching its lifetime and warranty. It could be that sediment (built up from water over time) at the bottom of the tank could cause the banging you’re hearing, but I would ask both plumbers specifically how a new tank would fix the issue. Warranties on hot water tanks are paramount to their cost.

      As for the expansion tank, it’s odd that your home would suddenly need one. Again, ask them to explain why and how an expansion tank will stop the banging when it never needed one before. But most importantly, find out the age of your hot water tank. If it’s at the end of its lifetime, getting a new one could save you from a potential tank flood (from it giving way and leaking) and stop that banging.

      Let us know what you find out!


  • Penny Polanco

    Hello my dad replaced the water line in the refrigerator now when i use the water or the ice maker comes on the pipes sound like woody woodpecker ,,,any suggestions I would really appreciate it. Thank you

    • Norma

      Could be air trapped some where in the lines. Follow my bleeding instructions in the article above. Good luck!

  • vetran

    for months now we have have been suffering from water hammer in as much as when our neighbours used their taps our pipes were banging,i have insulated our pipes and also turned the water off and turned on all the taps and then turned the water on to get the air out of pipes but this never worked . I have now solved the the problem it was happening because the water stop tap under the sink wasn’t fully turned on. now we have peace and quiet.

    • Norma

      That’s great to know! Thanks for sharing!

  • Teresa Wing

    Thank you so much ….I opened the cold water valve under sink in bathroom no more hammer noise. Woo Hoo… Teresa

  • guest

    when I turn the cold water faucet on I experience an explosion of air pressure combined with water also the same thing when flushing the toilet both at random what might be the problem

    • Norma

      Your water pressure to the house may be too high! For more info on that, refer to the above article.

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  • Linda mcandrew

    We remodeled the downstairs of a bi-level home adding bedrooms, a kitchen and
    enlarging a bathroom adding a shower. We have a air chamber or something on the sink in the new kitchen as a vent. The builder hand built a manifold
    so we could get to the shut off valves. Now we hear both a machine gun like banging and a slow rhythmic noise in 2 or 3 other places especially in the mornings when the water is first used. We have a well and the pressure is 40 lbs at max. All of the pipes and valves are CPVC. No one seems to know what to do. Help.

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  • Chris Nora

    We have groaning and banging pipes whenever we turn on the hot water . Two things may have started this. We had a new water heater installed and then added a laundry room. The pipes started banging shortly after dawn our water became contaminated with rust. We replaced our water heater and the noise was slightly abated but still continued. Our plumber cannot find anything wrong. HELP

    • Norma

      Chris, banging that happens when water is turned ON describes poor bracing, not water hammer. OR it could be air trapped somewhere. Because it’s when you turn on HOT that points to expansion of pipe that causes banging when hot water runs through the it–poor bracing allows that pipe to knock around as it’s expanding from the heat. When the banging happens, try to find exactly where it’s coming from–you gotta get to that pipe and secure it properly. You also describe “groaning”–could be air is trapped somewhere too. Follow my bleeding instructions in the article. Finally test the water pressure in the house…it may be too high…again, check the article for more info on that. Good luck!

      • Chris Nora

        Thank you. We will try it all.

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  • Paul

    Hammering and vibrating was only occurring when I turned on the cold water at the kitchen faucet and was coming from under the sink. I checked the cold water turn off under the sink and found it barely open. After opening it up more, the hammering noise ceased. So glad I did this before turning on and off all 10 sinks, flushing seven toilets, opearating two ice-dispensing refrigerators and three outside faucets. — Paul

  • Carolyn L

    We have a 19 yr old two story house. This issue started about a year ago. The noise happens during any water change of pressure and the noise seems to come from the wall between the bathroom and bedroom upstairs. The dishwasher cycles are the most chatter because that pressure is constantly changing. Anyhow, we did the valve shut off and running the faucets down but I just read that you need to run the washer and dishwasher too. How would I do that without ruining both appliances? What about the water heater?? We did replace the water heater about a year ago and that coincides with the timing of when the rattle noise occurred. Not sure if that makes the difference or how to fix it. If it persists how do I know WHERE IN THE WALL to cut to restrap a pipe!!! Is there a tool to detect the exact place? Would love some advise here. My home warranty will not cover or send someone unless the pipe bursts.

  • Tande

    We have been getting a loud clang in the pipes after the toilet is flushed and almost all of the water has refilled the tank, and then the hot water will stop.. Like, no water coming out of the pipes. There is hot water in the lines but it won’t come out of the faucets. All of the faucets.. This happened last spring so we fixed a valve in the bathtub faucet and it seemed to help.. After reading most of this thread, I feel like I need a water pressure regulator (our town is horrible about water pressure) but why does this affect the hot water only?

  • Dave

    If you have a newer house with pec water pipes the noise you hear when you walk by the walls is from air being in your water heater.
    Go to your water heater and open up the pressure relief value. This will release the air, let the valve shut when the water starts to run out.
    The noise will stop when you take a shower. This took me months to figure out. Plumbers wanted to open up my walls.

  • Luzita Ball

    Any ideas about whether trapped air causes loud hooting in the pipes?