and I'm not a Plumber

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Moderator Post (s) for this thread: > The start of the thread by doug seibert on 01/25/2005 > attn Lonny the plumber by doug seibert on 01/26/2005 > The EUREKA moment ? by doug seibert on 02/01/2005 > Tension In Toronto by LonnythePlumber on 02/01/2005 > Me Too by LonnythePlumber on 02/02/2005 > I think you've got it....... by doug seibert on 02/02/2005

"the explanation was the hot water usage expands the pipe, and 15 minutes later starts contracting and therfore moves in the strap and hits the studs."
........fasten the pipes with a clip that supports the pipe but allows the movement...........

"What I dont understand is the toilet, which never uses hot water, is causing the knock also, towards the end of the flush which indicates I have cold water pipe problem too"
......If you used a good fill valve maybe the pressure is too high.........check with a pressure gauge replacing any threaded fitting/faucet in the house

"I dont think we have water hammer arrestors ..... Would they be hidden in wall....."
......Yes....but they can be retro fitted to your system........

"I will soon start changing the sink faucets in the problem w/room and keep you posted....."
....but the problem can be caused by ANY faucet/valve in the house......

"I will soon be finishing the basement, It is then that I intend to open the wall/ceiling, to secure the pipes."
.......Start now by cutting open the closet access with a keyhole saw and fastening the pipe there.......