Supply Line Size for Rain Shower Head

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by santanaf, Oct 8, 2006.

  1. santanaf

    santanaf New Member

    Messages:
    31
    Hello,

    I have been posting some over at JohnBridge.com, but was recently directed here as most of my questions thus far involve plumbing and not yet tile.

    That being said I am in the midst of my bathroom renovation and am presently running my copper supplies. So far I have everything run to the sink, toilet, and to the base of the shower rough valve. The shower is a standup shower with two shower heads and a diverter in the rough in, one regular shower head and one 8" rain. All of my supplies are 3/4" copper. My shower valve and shower heads are both 1/2" IPS.

    My concern is regarding enough volume to feed the rain shower head

    My question is....

    Should I use a 3/4" to 1/2" IPS for connection to the shower valve and then continue 1/2" copper up to the shower head

    -OR-

    Should I just use 3/4" copper throught, always using 3/4" to 1/2" IPS all over

    -OR-

    Should I be using 1/2" IPS galvanized at all points beyond the valve?

    Thanks for your time and help.

    Alex
    Last edited: Oct 8, 2006
  2. OldPete

    OldPete DIY Senior Member

    Messages:
    186
    Location:
    NJ
    I was just researching the same thing... what size is the outlet for the shower head at the valve?
  3. OldPete

    OldPete DIY Senior Member

    Messages:
    186
    Location:
    NJ
    Never mind, I just saw that the valve and shower head are 1/2"... I would say you'll need to use 1/2" since going from 1/2">3/4" isn't going to do you any favors since the water acn only pass throught the valve via that 1/2" connection...

    But that's just my guess. ;)
  4. santanaf

    santanaf New Member

    Messages:
    31
    Well, I just got off of the phone with the manufacturer and they confirmed what I had more or less planned.

    Actually, I am going to be using 3/4" copper. The 3/4" copper is slight larger than the 1/2" IPS, but the 1/2" IPS is larger than the 1/2" copper. Due to this reason they have advised to use 3/4" copper as long as the supply coming into the shower valve is 3/4" copper. This will allow more water to flow to the shower head, and since no shower head sold is more than 2.5 GPM, and I have good water pressure from the city, the 3/4" copper will allow the shower head to completely fill up. I will notice more of a pressure drop if someone flushes the toilet or uses the sink, but I can live with that.

    So I will be using all 3/4" copper and 1/2" IPS to 3/4" copper female connections.
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