You guys know how to fix water hammer?

[pp4me]

Did the hammer start after replacing a faucet?

I didn't think that could happen but it did when I replaced my shower faucet because it was leaking. With the help of google I found a suggestion that fixed it. 1.) Turn off the main. 2.) Remove the faucet. 3.) Turn the main back on and let it run for 60 seconds. 4.) Put faucet back.

Worked like a charm.

[dualstow]

Didn’t replace a faucet, but some things changed when we replaced a lead intake pipe in the street. The water pressure got better in the shower and worse in the kitchen. That was several years ago.

[WiseOne]

This is sounding like a plumbing whodunit!!!

Since the water hammer started with your renovation, why not call the plumber you hired for that project? This is complicated - you replaced a pipe in the street??? - and the person who did the work should be in the best position to figure this out.

[boglerdude]

We just got a hammer in the kitchen when we installed a new faucet with side sprayer. Hammer hits when you turn the water on more than halfway.

[glennds]

We just got a hammer in the kitchen when we installed a new faucet with side sprayer. Hammer hits when you turn the water on more than halfway.

In your case you might try turning down the valves at the supply line angle stops a bit and see if that helps.

[WiseOne]

Just remembered this....

I get water hammer sometimes when I change the undersink filter in my mother's kitchen. I've tried just letting the water run for a while but that never fixes it. Instead I remove the filter and replace it. Sometimes it takes a couple of tries but eventually it works. I think the cause in that case is an imperfect seal between the filter and the housing.

Dualstow why don't you try turning off the water supply to the sink in question and unscrew, clean up and replace the hose connections? If it doesn't work maybe there's a problem with the faucet and you might need a new one. Replacing the faucet yourself is probably cheaper than calling the plumber, so might be worth doing first.

[dualstow]

This is sounding like a plumbing whodunit!!!

Since the water hammer started with your renovation, why not call the plumber you hired for that project? This is complicated - you replaced a pipe in the street??? - and the person who did the work should be in the best position to figure this out.

I think I’ve used up all my calls to the renovator. He’s gone above and beyond. However, the guy who was part of the intake project is the one who will be looking at the problem this coming week.

[dualstow]

(highlight is mine)

You know that noise you sometimes get when you shut off a faucet? A loud rattling.

I followed the steps from google because my dad got old and no longer remembers. :-(

1) Turn off main water valve
2) turn on the highest faucet in your home
3) turn on the lowest faucet. Let it drain, turn it off
4) Open main water valve
5) Let top faucet run and when it's done sputtering, turn it off.

I came upstairs to find green water in the sink with black particles. They didn't tell me about that. Meanwhile, the water hammer persists.
Any ideas?

Hi, the only differences I was taught from your outlined procedure are the following:
1. Keep the lowest faucet open when you re-open the main. Your summary says you closed it before re-opening the main.
2. Flush all the toilets when the main is closed while the faucets are draining
3. When re-opening the main, do so slowly
4. After re-opening the main and the faucets are finished sputtering and building up flow, start closing the lower faucets first and work your way up to the highest

I think this is obvious, but just to confirm, you are only opening the cold side of the faucets, right?

Is the hammering only happening at one particular sink? If so, you could try closing down the shut off valve under that sink a little bit at a time to see if it helps. Sometimes excessive flow through the shut off valve and supply line can cause hammer. If it's happening at multiple locations, this is probably not the problem.

I don't know if anything I've added is helpful, but hopefully so.

Tried it your way this time, Glenn.
(1) None of this is obvious to me but yes, I’ve always run the cold only as that’s the way my Dad taught me years ago.
(2) I can only *hear* it in the top sink, but also the clotheswasher in the basement. The latter is super loud.
If today’s experiment doesn’t work, it’s plumber time. (Not Hammer time).

[Hal]

Tried it your way this time, Glenn.
(1) None of this is obvious to me but yes, I’ve always run the cold only as that’s the way my Dad taught me years ago.
(2) I can only *hear* it in the top sink, but also the clotheswasher in the basement. The latter is super loud.
If today’s experiment doesn’t work, it’s plumber time. (Not Hammer time).

Before spending big dollars getting a plumber, try this. Make sure you leave the washing machine taps open after fitting.
https://www.youtube.com/watch?v=aMd7bQ8kkj8

[dualstow]

Thanks, I’ll take a look!