Valve layout for tub/shower??????????

Discussion in 'Shower & Bathtub Forum & Blog' started by pmaru77, Jun 11, 2016.

  1. pmaru77

    pmaru77 Member

    Joined:
    Nov 1, 2008
    Occupation:
    Mech Eng/designer
    Location:
    California
    The book says that the valve to be 30" up from the tub for a tub/shower install, and the valve should be up 48" for just a shower.

    In reality, the shower will be used 95% more than the tub. So I'd like to put the valve in between, like maybe 42". Is this a good idea?
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    The only restrictions may be related to this:
    - the tub spout must be higher than the tub rim to prevent possible backflow
    - the pipe for the spout must be far enough away from the valve so that there is clearance for the trim
    - some valves have a minimum distance between the valve and the spout to help ensure the water flows where it needs to.

    So, in general, you can put it there if you wish as long as there's no other technical issue as listed above. You'd have to review the installation instructions carefully. The height for shower use is a good average so you don't have to stoop over to reach or adjust. For tub use, that should give you enough clearance to keep the tub spout high enough to pass code.
     
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  4. Terry

    Terry Administrator Staff Member

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    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    30" sounds fine for a tub/shower.
    I like to have the spout between 4-1/4" and 6" higher than the tub.
    The valve about 10" to 12" higher than the spout.
    I like a somewhat low valve location if you are in the tub, so that you can reach it when sitting in the tub.
    If you're standing for a shower, it's easy to reach down.

    My youngest graduated from the University of Washington over the weekend. I wasn't on a computer, but was with family.
     
  5. hj

    hj Master Plumber

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    Aug 31, 2004
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    Plumber
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    Cave Creek, Arizona
    If the valve is 30" above the tub, then it will be about 44" above the floor, and close to the 48" for a shower.
     
  6. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    I was thinking of 30" off the floor for tub, and I normally do 48" off the floor for shower.
     
  7. pmaru77

    pmaru77 Member

    Joined:
    Nov 1, 2008
    Occupation:
    Mech Eng/designer
    Location:
    California
    I took liberty and bent the rules. Why? because I can. My valve is at 44" and that is tough crap if someone has to reach the valve to add more water to the tub. By the time I sell the joint, I'll be 6 ft under most likely. Like I said 99% showers, 1% tub. I don't care about the next owners.
     
  8. lanachurner

    lanachurner Member

    Joined:
    Mar 25, 2016
    Location:
    Minnesota

    Agreed. Even if the tub is used mostly for a shower you still want the shower valve to be easily accessible while you are sitting in the tub. 30" above the floor of the tub is about right.
     
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