Banging pipes when shower is started....

brparke3May 3, 2012

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!

Thank you for reporting this comment. Undo
dw85745

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.

    Bookmark   May 10, 2012 at 2:31PM
Sign Up to comment
More Discussions
Undermount sink edge intrudes on cut-out for faucet
15 years ago my kitchen was totally renovated by a...
Andee
Water softener decision for Austin, Texas city water
I want to better protect my plumbing from wear and...
ivaniphone
Doable...European sink & US bathroom pop-up drain and faucet?
if I purchase a small Belfast sink fron England to...
rantontoo
Fleck Drain Question
I am fixing to install a Fleck 9100. I can run a drain...
rss1978
Electric Water Heater Problem
I have an electric water heater; about a month ago...
aeharris63
Sponsored Products
TOTO Lloyd(R) High-Efficiency Showerhead, 1.75 gpm
Modern Bathroom
Brushed Nickel 3 Piece Shower Set
MR Direct Sinks and Faucets
Beadboard Paintable Wallpaper
Grandin Road
Gloss Floor Lamp by Pablo Designs
$395.00 | Lumens
MTI Parisian 1 Tub (66" x 35.75" x 23")
Modern Bathroom
ALFI AB16RW 16 Inch Round Wall Mounted Chrome Shower Arm for Round Rain Shower H
$61.99 | Hayneedle
16" Basalt stone Wash-hand Basin Bathroom style - KALOO BLACK
Living'ROC
Pink Porcelain Small Rimmed Cake Stand
Classic Hostess
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™