Skip to main content

 

Moen Solutions

B17-Troubleshooting Shower Stacking

 

 

clipboard_e37f8a41dce03dc8d3f8f83af3625379c.png

Symptom: When a 1, 2 or 3 handle tub and shower exhibits the annoying symptom of shared flow or STACKING.  The consumer turns the water flow on and instead of the flow immediately coming out off the tub spout, they are getting a trickle or more out of the showerhead,

This document cover the diagnosis process for a one-handle, two-handle or three handle tub and shower faucet.  if none of the reasons below apply please contact us for further assistance at 1-800-BUY-MOEN.

Stacking Checklist

1. Installation Layout:  Check that the spacing between the main valve and the outlets for the tub spout and showerhead are within the guidelines on the instructions.clipboard_e82c0b525eab5892fb7e5a3b414f1e854.png

 

  • The tub spout must be installed 6" min and 9" Max below the valve
  • The showerhead must be at least 46" above the valve.

Solution:  Re-plumb the outlets to the correct spacing.

 

2. Piping Material:  The installation instructions specify that the piping used from the Valve Down to the Tub Spout outlet be 1/2" metal pipe (Copper, Galvanized, Brass IPS (Threaded) pipe.

Solution: Replace incorrect piping. clipboard_e31ef63b8976774b2be764184a83bbb05.png

 

Pex, Braided Flexible Water Supply Lines and CPVC all have small interior diameters which create the back up of water in the system that can result in the STACKING symptom

 

 

 

3. Tub Spout:  Remove the tub spout.  If the stacking problem goes away, examine the tub spout for restrictions or damages, this could include debris or the white diverter gate in the spout is not opening or closing completely.

Solution: Clean the restriction and insure the diverter is pushed all of the way down.  If necessary, contact Moen for a replacement tub spout.  clipboard_e6d66d0303459cce10757515e98689aaa.png

 

4. Multiple elbows between the valve and tub spout:  Only one elbow should be used between the valve and spout.  Elbows slow the water down as it exists the spout and could  create the stacking symptom.

Solution:  Remove any additional elbows to leave on elbow between the valve and tub spout.  clipboard_edc10c344144f7bf9142f4cc74695722c.png

 

 

   5. Upside-down valve:  If a valve is installed upside down it will send the water to the showerhead first instead od down to the spout.  Check you installation to make sure "UP" is facing the ceiling.

Solution:  Reinstallation of the valve may be required to correct stacking.  clipboard_e17e38c0a1e793133d4a68b612712cfa6.png

Two- handle Tub and Shower Diagnosis

 

1. Upside-down flow director:  If the valve was mounted upside-down to accommodate water supplies that come in from the ceiling, the flow director must be removed and installed into the side of the valve the water supply enter.

For valve mounted upside-down to accommodates supplies from the ceiling  clipboard_ef65872ff48464befc2cd621999483a45.png

clipboard_eb4cfdbcac28ce5e8a06244cd7f619e85.png

Supply ports on bottom

clipboard_ebecc5fd6c062218723b6020cd20492e0.png

Unscrew the Flow director

clipboard_ee2da44a1bb7da6acfc1a7369f447dbdf.png

 

clipboard_efc4130ceb8c6203d306e5b413ef1db3a.png

Supply ports are now on top

clipboard_e4ce81a261ca574ad6de3aa355f0f0826.png

Flow director installed threaded side on top

clipboard_e063b82ce684699388044f71f0c2d6cf8.png

 

If you are not able to correct the issue creating the Stacking, consider installing a SHOWER ARM VOLUME CONTROL- Moen part 91888.  This device will allow you to shut the water flow off a the showerhead,  It is Not designed to be used a substitution for the control handle and should never be used as your main on/off control.

clipboard_edc882fe9cd26fa1371ce4a2b80ac260a.png