Noisy Pipes & Water Hammer
What Is Water Hammer?
If you’re hearing loud banging or knocking sounds in your pipes, that’s called water hammer. It happens when water is flowing through your pipes and suddenly gets stopped or changes direction. That sudden stop creates a shockwave that slams through the plumbing, and that’s the bang you’re hearing.
Usually, it’s caused by a valve closing too fast, loose pipes, or a worn-out part that’s supposed to cushion the flow. It may seem noisy, but it’s your plumbing taking a hit every time it happens. The longer it goes on, the more damage it can do.
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How To Tell If You Have Noisy Pipes or Water Hammer
Banging When You Turn Off a Tap
You hear a loud thud or bang right after you shut off a tap or when your washing machine or dishwasher switches cycles.
Rattling or Vibrating Pipes
You can hear pipes shaking or rattling inside the walls, especially when water is running at full pressure.
Whistling or Squealing Sounds
A high-pitched whistling or squealing noise comes from your pipes when you turn a tap on. It usually means water is being forced through a tight spot.
Noises That Happen at Random
You hear banging or thumping when nobody’s using the water. That can be your hot water system or a valve opening and closing on its own.
Knocking When Hot Water Is Running
Your pipes make a ticking or banging sound when the hot water is on. That’s usually the pipes expanding and contracting as they heat up and cool down.
What Causes Water Hammer?
Worn or Failed Arrestors
Your plumbing has small devices called water hammer arrestors that absorb the shock when water stops suddenly. Over time they wear out and stop doing their job. Once they fail, there’s nothing cushioning that impact, and the banging starts.
Loose or Unsecured Pipes
If your pipes aren’t properly strapped down, they can move around when water flows through them. Every time the water stops or changes direction, the pipes shift and knock against the wall, floor, or other pipes around them.
High Water Pressure
If the water pressure coming into your home is too high, it puts a lot of extra force on everything in your plumbing system. Valves, taps, and appliances all cop a lot more impact when they shut off, and that’s exactly when you start to get the loud banging.
Is it a serious problem?
Noisy pipes are not just an annoying sound; there’s real force behind that banging. Every time water hammer happens, it’s putting stress on your joints, fittings, and valves. Over time, that repeated impact can loosen connections and cause leaks you can’t see behind walls or under floors.
It can also damage appliances like your dishwasher or washing machine, because their valves are copping that same shock every cycle. Leave it long enough and you could end up with burst pipes, water damage, or a repair bill that’s a lot bigger than it needed to be. It’s one of those things that’s much cheaper to fix early than to deal with later.
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DIY Checks You Can Try
Before you call a plumber, there are a few things you can check yourself. They’ll help you work out whether it’s something minor or something that needs a professional.
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