Construction Resources and Support

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Pipe noises can vary from loud hammering sounds to high-pitched squeaks. Causes include be loose pipes, water-logged air chambers, or water pressure that's too high. Exposed pipes may simply be anchored for some quieting; other solutions such as anchoring pipes concealed inside walls, floors or ceilings, may require a professional.

What about banging?

Pipes that bang can usually be anchored with pipe straps every 6 to 8 feet for horizontal runs, 8 to 10 feet for vertical.

* If the pipes bang when you turn on the water, you may need to more straps, cushion the pipes with a rubber blanket, or both.
* When one anchors a pipe, especially a plastic one, leave room for expansion.
* Don't use galvanized straps on copper pipes.

How about plumbing that squeaks?

Usually, only hot water pipes squeak. As the pipe expands, it moves in its strap, and friction causes the squeak.

* Solution: Cushion it similar to that noted above for a banging pipe.

What causes a "Water Hammer"?

Most often, this noise happens when one turns off the water at a faucet or an appliance quickly. Water flowing through the pipes immediately comes to a halt, causing a hammering noise.

Look for:

* Loose Pipes.

Solution:

* Anchor pipes.

Look for:

* Faulty air chambers. These lengths of pipe, installed behind fixtures and appliances, hold air that cushions the shock when flowing water is shut off. They can get filled with water and lose their effectiveness.

Solution:

* To restore air to the chambers, turn off the water at the main shutoff valve. Open all the faucets to drain the system. Close the faucets and turn the water on again. The air chambers should fill with air.

Look for:

* Water pressure that's above 80 psi (pounds per square inch).

Solution:

* To lower the pressure, install a pressure-reducing valve.

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