Tapping noise in wall after flushing upstairs toilets
We have two toilets upstairs. After flushing either toilet we hear a tapping noise in the walls on the main level of the house. The noise is a rapid tapping and tailors off within five or so seconds. We are trying to figure out the cause of this problem. Could this be a broken pipe strap? Should we be concerned that the pipes could separate?
A couple things come to mind. Since the toilet water is cold, the pipe (especially PVC) could be contracting as a reaction to the addition of the cold temperature. May just be the pipe scraping against a stud or a hanger/clamp. May also be water dripping down the pipe and hitting a fitting in the lower living area. Since it goes away so quickly, this would be my guess.
If you have never made a mistake, you haven't done much.
it could also be somthing wrong with the shut-off switch were directing water to the toilet.... it happened to me before when I need to change the shut-off switch for a sink to get rid of a big noise.... however, it happens to me with the hot water supply switch though.... not sure if cold water switch will be the same...