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Question DetailsAsked on 2/24/2018

Water thumping in the pipes when I turn either hot or cold water on at the kitchen sink.

Kitchen faucet replaced a few days ago and the problem is worse. Plumber says it must be mineral deposits in the pipe leading to kitchen sink. Dishwasher right beside it doesn't have the problem, nor do any of the other water pipes in this 1970 rental. And yes, this is a hard water area.

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I can't see mineral deposits in the pipes causing this - they would probably have the opposite effect. If this was happening when you turned it OFF, then I would say you need a water hammer absorber installed. But upon turning it ON, I would say you have pipes moving as the pressure is taken off them - slamming against studs or joists as they move around. Tracking that down can be tough, especially if concealed in walls or floors which can lead to some drywall/paint repair cost.

You have two possble easy ways to MAYBE minimize this -

1) partly close the shutoff valves under the sink that lead to the faucet, on the supply tube or tubes which cause the problem (probably only on hot or cold use and combined, not both hot and cold alone.) This will reduce the flow rate to the fauceet - but will also reduce the flow from the faucet and possbly connected spray nozzle, so that may not be acceptable.

2) check pipes under sink and if exposed, in crawlspace or basement while someone turn it on repeatedly - might be you can stuff some fiberglass or soft foam like pipe insulation between the pipe and wht framing it is bouncing in. Electrical tape can also work - duct tape too but generally does not last so well.

3) open the faucet slower so there is less of a surge of water coming into it


Since it got worse, I would guess the new faucet has larger diameter supply tubes or the shutoff valves had been partly shut down, so now the water surges more when turned on.

Answered 8 months ago by LCD




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