HELP! :eek:Very irritating noise. I have three toilets in my house and this applies to all three.

After flushing the toilet... there's a constant tapping noise during the time when the tank is being filled. The tapping noise is in one location of the house. Here's what I've done so far:

*No pipes are loose.
*Changed innards of all three toilets
*Drained the house several times
*I've installed a water hammer arrestor on the toilet
*Sprayed foam between copper pipes and floor joists to cushion any contact.

It seems like the tapping is within the copper pipe. Any help would be appreciated.

Is there a possibility of 2 pipes touching each other or one pipe crossing over the other? If you see this condition, put a piece of cardboard, wood or rubber between the 2 pipes as a buffer, so that there is no physical contact between the 2 pipes. This could solve the problem.

Is there a possibility of 2 pipes touching each other or one pipe crossing over the other? If you see this condition, put a piece of cardboard, wood or rubber between the 2 pipes as a buffer, so that there is no physical contact between the 2 pipes. This could solve the problem.

I wish it were so...
No pipes are touching. I'm thinking that the pipe is tapping against the floor and the only solution is to have a plumber re-route it. The only thing is... it only happens when I flush the toilet. When I turn on the sink... there's no tapping


Everyone, I think I know what the problem is. The copper pipe is probably rubbing against the wood its nailed to. Because the fit is so tight... there's no way of stopping it unless I undo it. Well... maybe if it gets irritating enough. Will let everyone know if I do this.

Knocking, popping, creaking and crackling pipes are a common complaint, especially in colder weather. I can tell you what's happening and take the mystery out of it but you're not going to like the repair. When a draw is made on a hot water line the line expands against a pipe strap next to a stud and when you drain hot water from your tub or shower it goes into a chase that is a little cooler then room temperature. The heat expands the pipe causing it to rub against the stud to which it is pipe strapped. This is the sound you hear. As it cools it contracts and the noise is heard again. To repair it you must tear open the walls and locate the pipe strap that's causing the problem and shim it tight. Most people when they learn what causes it just elect to live with it. Good luck and thank you for rating my answer. Tom