Return to the Plumbing Forum | Post a Follow-Up

 o
Banging pipes when shower is started....

Posted by brparke3 (My Page) on
Thu, May 3, 12 at 9:57

I have a current issue with my downstairs shower where my pipes want to "rattle" if I dont reach the temperature i want prior to pulling the shower knob in our tub. Basically, if i start the flow of water then immediately full the shower knob, i get major rattle. Lately, it's been occuring even when I do get my temperature right before pulling the knob. Sometimes I'm able to end the rattle by turning towards more hot or cold water, then adjusting to the temperature i'd like, but regardless, it's very annoying and I feel it rattles so hard at times that it may damage the pipes.

I feel i need to note that i found this post from an earlier problem on this site and thought it was very informative:

Posted by zl700 (My Page) on Tue, May 13, 08 at 9:23
"It�s probably caused by the pressure balancing spool in your valve attempting to adjust for fluctuations in the hot and cold supply pipes. This can be difficult to fix easily without figuring where the flow and pressure differences are happening. In a perfect world both pipes feeding the valve are of equal lengths, have the same number of valves and fittings and so on, which we know is impossible.
If you have stop valves on or near the shower valves, try adjusting them, usually the culprit is the cold. Also try removing the flow restrictor on the shower head which very often increases the flow curing the problem."

Do I need to adjust the balancing spool (or replace). I'm not sure if there are adjustable valves in our crawl for the hot and cold water lines in our shower, so that isnt an option. I do want to note that my hot water heater is upstairs and the problem is downstairs...maybe gravity is causing excessive pressure in the HW line? I know it isnt "water hammer"....i feel it's mainly due to pressure differences through a restricted space. Anyway, i'm usually pretty good in figuring this stuff out, but any help would be great.

Thanks!


Follow-Up Postings:

 o
RE: Banging pipes when shower is started....

Not a plumber, but one easy solution may be to tie in a pipe into the cold water line so it goes vertically up the wall cavity. This way any water in the line will rise into this empty line and become in effect shock absorber for any rattling caused by air formation.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Plumbing Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here