Loud Jackhammer Noise When Toilet Flushed In Morning

[Peter Min]

Hello - when a certain toilet in my condo is flushed, it makes a loud jackhammering noise in the wall and it gets alleviated if I open up the valve slightly. The interesting things are:
- it only happens at this one toilet and not the other one in my house
- happens only once in a while
- happens only really early in the morning (first flush of the morning)

I would appreciate help on determining what this issue is, how it can be fixed, and if it's something I should be concerned about?

Thank you.

 

[Sylvan]

Hydraulic shock weaves occur with a quick closing valve such as a 400 A Fluid master or a solenoid or in some casing cchattering happens with a lose washer

Try using the valve under the tank to throttle down some of the volume and see if that helps

 

[Sponsor]

 

[FullySprinklered]

Always leave your jackhammer in the truck. Maybe you'll get lucky and someone will steal it.

 

[Terry]

You could have a loose washer in the shutoff at the wall.
Sometimes opening that valve up all the way helps, or replacing it.
A loose washer can vibrate was water passes by it.

 

[Jadnashua]

Shutoff valves like used for a toilet or sink should always be fully open or fully closed (well, a multi-turn one sometimes is better if you open to max, then back off a small amount so it doesn't lock and you can turn it both ways to help loosen it). IF fully open is a problem, your water pressure may be above the maximum allowed in a residential setting of 80psi. To eliminate a washer entirely, swap a multi-turn shutoff with a 1/4-turn valve. While not as common, some filler valves can make that sound if the washer or seal is getting hard from age and chemical exposure. The local water quality can make some of them wear out fast, and excessive pressure makes it worse.

 

[WJcandee]

Your question suggests that you don't currently have the wall valve open all the way. Open it all the way and that stands a good chance of solving the problem. Terry's suggestions above are of course the full list of things to try. It also could be a sticky fill valve, since it happens only once a day. We find the Korky 528MP is a good, universal valve and costs maybe $10 or 11.