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Vince · Joined: 19 Feb 2003 Posts: 1

When the heating is on and pump is circulating water, we get a banging noise from a couple of radiators. Noise can be at varying speeds and volume, this can also be like a ticking noise.

Radiators been bleed several times and no air can be found.
Noise doesn't vary whether radiator valve is on or off.

Can you help?

ChrisR · Posted: Wed Feb 19, 2003 4:00 pm Post subject:

The noise is caused by the metal pipes and radiators moving as they expand on heating up and contract on cooling. They will jam against wooden boards etc, and against the hooks on the radiator brackets, so they move in small jumps, which make the noises.
It is good practice to put felt insulation around pipes where they pass through wooden joists etc to prevent the noise there.
Some radiator manufacturers supply small plastic "saddles" to go on the rad bracket hooks. You can usually insert pieces of insulated solid core wire after the radiator is fixed, from the end mearest. It takes two people, one poking wire while the other lifts the radiator a tiny bit. The ends of the wire can be bent down out of sight afterwards.