That's what's happening in your pipes. When your toilet flushes, it opens a valve to get more water and then suddenly shuts the valve off. The water that was rushing to your toilet is now cut off and the pressure causes your pipes to make a loud banging noise. How serious is the banging noise?
Your water pipes may whistle and sing after you flush the toilet, or they may bump and grind. Either way, something's wrong -- they shouldn't make any noise at all. When the pipes make loud banging sounds, the fault is in the pipes, but whistling sounds usually come from the toilet fill valve.
After flushing the valve, it is ready to reassemble. If homeowners are able to feel the vibration responsible for the hum, installing insulation between the pipe and the wall often muffles the sound. Plumbing supply houses carry affordable foam pipe insulation that is ideal for this purpose.
There are a number of reasons why a toilet may make noise after flushing; however, a loud noise that takes more than a minute after flushing the toilet may indicate a restricted water flow or a problem with water pressure. In such a case, the pressure valve should be adjusted while the toilet is making the noise.
A knocking sound, or water hammer, may occur in your water pipes after you flush your toilet. Such a sound usually indicates that a pipe's air chamber, which is located in a line near the toilet, has filled with water. This may happen one or more times in the course of a year.
Do you hear a loud vibrating noise for about 30 seconds after your flush your toilet? Does the sound reverberate through your plumbing like the noise is coming from the pipes in your walls or floor? It may even be more of a humming noise like a fog horn. The culprit of the vibration is likely your toilet fill valve.
Yet another noise problem can come from the toilet. If, after flushing, you hear a banging or rattling at the end of the fill cycle, then it is likely that the ballcock assembly, which controls the fill process, is worn. How to Prevent Noisy Pipes from Your Toilet
Open the toilet tank and flush the toilet. When the valve starts making the foghorn noise, lift the float ball all the way to the top of the tank. If the noise stops, there's a loose or worn ...